vault backup: 2025-01-19 21:14:51

67 files changed, 0 insertions, 812 deletions

diff --git a/3 resources/.gitkeep b/3 resources/.gitkeep
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index e69de29..0000000
--- a/3 resources/.gitkeep
+++ /dev/null
diff --git a/3 resources/Bash.md b/3 resources/Bash.md
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index 841443f..0000000
--- a/3 resources/Bash.md
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@@ -1 +0,0 @@
-How to [[Reference arguments]].
\ No newline at end of file
diff --git a/3 resources/Bash/Reference arguments.md b/3 resources/Bash/Reference arguments.md
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index f39eeb1..0000000
--- a/3 resources/Bash/Reference arguments.md
+++ /dev/null
@@ -1,6 +0,0 @@
-Reference as array: `$@`.
-Reference as string: `$*`.
-
-Let's say we want to open a file in our favorite editor through a script, prefixing the filename with something such as a date.
-If we were to use `hx "$(date) $@"`, where we reference the arguments as an array, it'd open more than one file - one for the date and one for each argument.
-We must use `$*` so that our invocation becomes `hx "$(date) $*"`. This would open a single file with the name being the combination of our arguments prefixed by date.
\ No newline at end of file
diff --git a/3 resources/CSS.md b/3 resources/CSS.md
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index 32a3113..0000000
--- a/3 resources/CSS.md
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@@ -1,28 +0,0 @@
-**Display**
-display none vs visibility hidden: display: none is really like the element does not exist. Visibility hidden just hides it but it still takes space.
-
-A display: none element can still have size and be coloured with a background image. It still doesn't take space. This can be used for a timeline bar for example!
-
-**Flexbox**
-Flexbox deals with layout always in only one dimension; it's possible to specify which dimension: either vertical or horizontal.
-
-Two axes: main and cross
-
-Control main axis: `flex-direction: row|row-reverse|column|column-reverse`. The first two make it a horizontal layout and the latter make it a vertical layout.
-
-Cross axis is always the opposite of `flex-direction`, so if `flex-direction: row-reverse` the cross axis is `column-reverse`.
-
-The writing mode determines where the start and end are, based on for example languages. Japanese is written from right-to-left rather than western left-to-right.
-So while in Europe the start of a flexbox is at the left and the end at the right in Japan this would be reversed.
-
-**Relationships**
-An important aspect of creating layouts with CSS is the relationships of elements with each other. For example parent/child relationships.
-
-If we change the width of a parent element; the height of all children increase. This happens because the total area of the parent remains the same.
-
-When the edge of a child aligns with its parent and we add a margin to the child; it pushes to the parent as well. This phenomenon is called ==collapsing margins==. It can be prevented by unaligning the edge(s) for example by adding padding or setting `display: flow-root;`.
-
-In `flexbox` siblings push against each other; if we add padding to one, it pushes against the other making it smaller. This does not happen in grid, where each cell gets a fixed size and the padding pushes against its own side.
-
-**Centering stuff**
-Use `margin-inline: auto;` -> this adds margins on both sides of the element. This can be used to center stuff on the page for example.
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diff --git a/3 resources/HTML/Inline VS Block elements.md b/3 resources/HTML/Inline VS Block elements.md
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index bd72478..0000000
--- a/3 resources/HTML/Inline VS Block elements.md
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@@ -1,69 +0,0 @@
-A block element always starts on a new line and automatically have their margin set to a non-zero value.
-An inline element, as the name suggests, does not start on a new line and has no automatic margins. It
-takes only the space that is required for the content it contains.
-
-Block elements:
-- <address>
-- <article>
-- <aside>
-- <blockquote>
-- <canvas>
-- <dd>
-- <div>
-- <dl>
-- <dt>
-- <fieldset>
-- <figcaption>
-- <figure>
-- <footer>
-- <form>
-- <h1>-<h6>
-- <header>
-- <hr>
-- <li>
-- <main>
-- <nav>
-- <noscript>
-- <ol>
-- <p>
-- <pre>
-- <section>
-- <table>
-- <tfoot>
-- <ul>
-- <video>
-
-Inline elements:
-- <a>
-- <abbr>
-- <acronym>
-- <b>
-- <bdo>
-- <big>
-- <br>
-- <button>
-- <cite>
-- <code>
-- <dfn>
-- <em>
-- <i>
-- <img>
-- <input>
-- <kbd>
-- <label>
-- <map>
-- <object>
-- <output>
-- <q>
-- <samp>
-- <script>
-- <select>
-- <small>
-- <span>
-- <strong>
-- <sub>
-- <sup>
-- <textarea>
-- <time>
-- <tt>
-- <var>
diff --git a/3 resources/Helix/Inline diagnostics.md b/3 resources/Helix/Inline diagnostics.md
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index 2a84825..0000000
--- a/3 resources/Helix/Inline diagnostics.md
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@@ -1,13 +0,0 @@
-#helix #editor
-
-
-completion supports paths (filepaths etc).
-snippet completion from LSP supported
-inline diagnostics can be enabled with:
-```
-[editor]
-end-of-line-diagnostics = "hint";
-
-[editor.inline-diagnostics]
-cursor-line = "error";
-```
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diff --git a/3 resources/Images/IMG_3980.jpg b/3 resources/Images/IMG_3980.jpg
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diff --git a/3 resources/Images/IMG_3982.jpg b/3 resources/Images/IMG_3982.jpg
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diff --git a/3 resources/Images/Pasted image 20250107205518.jpg b/3 resources/Images/Pasted image 20250107205518.jpg
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index bea7875..0000000
--- a/3 resources/Images/Pasted image 20250107205518.jpg
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diff --git a/3 resources/MermaidJS.md b/3 resources/MermaidJS.md
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index 2e4b71e..0000000
--- a/3 resources/MermaidJS.md
+++ /dev/null
@@ -1,24 +0,0 @@
-#resource
-
----
-**ZenUML**
-Optional **Title**
-**Participants** can be declared when used or at the start.
-**Annotators** give **participants** a special icon, defined at the doc site.
-**Aliases** give a short **participant** name a more descriptive name when rendered, e.g: A as Alice <- Alice will be rendered, but the code can use A.
-**Messages** between **participants** can be **sync, async, creation or reply**.
-**Sync** use A.\<MessageName\> have a block {} for nested messages
-**Async** use an arrow A->B: How are you? 
-**Creation** new keyword new A(optional params)
-**Reply** three ways to define:
-* Assign var from **Sync** message, e.g: OptionalType a = A.SyncMessage()
-* Return A.SyncMessage { return blaat }
-* @return or @reply on an **async** message
-**Nesting** can be done on both creation and sync messages using blocks {}.
-**Comments** can be added using `// comment` and support markdown.
-**Loops** can be defined using keywords: **while, for, foreach and loop**.
-**Alternative** paths can be sequenced using **if, else** statements. if(blaat) { A.syncMessage(B) }
-**Opt** fragments rendered via `opt { ... }`. This can be useful for optional responses or paths.
-**Parallel** paths can be defined using `par { ... }`.
-**Try/catch/finally** statements are supported as well.
-**@Starter(participant)** to make the line start from a **participant**
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diff --git a/3 resources/MySQL.md b/3 resources/MySQL.md
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index dc44345..0000000
--- a/3 resources/MySQL.md
+++ /dev/null
@@ -1 +0,0 @@
-Foreign keys live in `information_schema.referential_constraints`.
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diff --git a/3 resources/Obsidian.md b/3 resources/Obsidian.md
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index 2c256d2..0000000
--- a/3 resources/Obsidian.md
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@@ -1,6 +0,0 @@
-#resource #obsidian 
-
-Command-palette: CTRL+P
-# Templates
-Templates can be configured in Settings > Core Plugins > Templates. It requires to have a directory dedicated to templates. We can then insert templates into notes using the command: Insert highlight.
-We can also configure a templare for our daily notes, via Settings > Core Plugins > Daily note.
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diff --git a/3 resources/Puppet/Documentation.md b/3 resources/Puppet/Documentation.md
deleted file mode 100644
index 7afdf72..0000000
--- a/3 resources/Puppet/Documentation.md
+++ /dev/null
@@ -1 +0,0 @@
-The documentation for the Puppet that we use is found at https://www.puppet.com/docs/puppet/8/puppet_index.html.
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diff --git a/3 resources/Puppet/Replace a line in a file.md b/3 resources/Puppet/Replace a line in a file.md
deleted file mode 100644
index 2369e84..0000000
--- a/3 resources/Puppet/Replace a line in a file.md
+++ /dev/null
@@ -1,31 +0,0 @@
-#puppet 
-
-
-```
-  file_line {
-    '/etc/sysconfig/libvirt-guests onboot':
-      path  => '/etc/default/libvirt-guests',
-      line  => 'ON_BOOT=ignore',
-      match => 'ON_BOOT=';
-    '/etc/libvirt/qemu.conf vnctls':
-      path   => '/etc/libvirt/qemu.conf',
-      line   => 'vnc_tls = 0',
-      match  => '^#?vnc_tls = ',
-      notify => Service['libvirt'];
-    '/etc/libvirt/qemu.conf vnctls_verify':
-      path   => '/etc/libvirt/qemu.conf',
-      line   => 'vnc_tls_x509_verify = 0',
-      match  => 'vnc_tls_x509_verify =',
-      notify => Service['libvirt'];
-    '/etc/libvirt/qemu.conf tls':
-      path   => '/etc/libvirt/qemu.conf',
-      match  => '^default_tls_x509_cert_dir = "/etc/pki/qemu"$',
-      line   => '#default_tls_x509_cert_dir = "/etc/pki/qemu"',
-      notify => Service['libvirt'];
-    '/etc/libvirt/qemu.conf tls_verify':
-      path   => '/etc/libvirt/qemu.conf',
-      match  => '^default_tls_x509_verify = 1$',
-      line   => '#default_tls_x509_verify = 1',
-      notify => Service['libvirt'];
-  }
-```
diff --git a/3 resources/Puppet/User management.md b/3 resources/Puppet/User management.md
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index a452089..0000000
--- a/3 resources/Puppet/User management.md
+++ /dev/null
@@ -1,10 +0,0 @@
-#puppet
-
-Users can be managed with the [user resource](https://www.puppet.com/docs/puppet/7/types/user.html)
-
-[System users](https://www.puppet.com/docs/puppet/7/types/user.html#user-attribute-system) can be defined as follows;
-```
-user {
-  system => true|false
-}
-```
diff --git a/3 resources/RabbitMQ.md b/3 resources/RabbitMQ.md
deleted file mode 100644
index 312bec2..0000000
--- a/3 resources/RabbitMQ.md
+++ /dev/null
@@ -1 +0,0 @@
-With `rabbitmqctl list_queues` we can add columns to show. So instead of the default layout which shows messages in the Q after the name and is horrible we can specify stuff like: `rabbitmqctl list_queues messages consumers name`. There are more options to be found in `man rabbitmqctl`.
diff --git a/3 resources/Ripgrep.md b/3 resources/Ripgrep.md
deleted file mode 100644
index b8ce387..0000000
--- a/3 resources/Ripgrep.md
+++ /dev/null
@@ -1 +0,0 @@
-Pass `-L` to `rg` to make it follow symlinks: this is handy for example when searching hieradata, because node definitions can be symlinked.
\ No newline at end of file
diff --git a/3 resources/Statistics/Moving average.md b/3 resources/Statistics/Moving average.md
deleted file mode 100644
index c87f0e4..0000000
--- a/3 resources/Statistics/Moving average.md
+++ /dev/null
@@ -1,20 +0,0 @@
-#statistics
-
----
-Also known as; rolling-average, running-average, moving-mean, running-mean, rolling-mean.
-
-Has three variations: simple, weighted, cumulative.
-
-A type of [[convolution]].
-
-Reduces noisiness in a time-series graph which makes long-term trends or cycles more easily visible.
-
-Keeps averaging a subset of given set and move the subset one space to the right.
-Example with sample-size of 3:
-```
-set: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
-i=1: avg([0, 1, 2]) = 1
-i=2: avg([1, 2, 3]) = 2
-i=3: avg([2, 3, 4]) = 3
-...
-```
diff --git a/3 resources/TailwindCSS/Container.md b/3 resources/TailwindCSS/Container.md
deleted file mode 100644
index 4b3e6ca..0000000
--- a/3 resources/TailwindCSS/Container.md
+++ /dev/null
@@ -1,2 +0,0 @@
-The container class basically adds a margin to the left and right sides. If added mx-auto; it divides the margin equally over both sides.
-The margin depends on the current breakpoint. The container max-width is the breakpoints' min-width.
diff --git a/3 resources/TailwindCSS/Prevent overflow.md b/3 resources/TailwindCSS/Prevent overflow.md
deleted file mode 100644
index 8a4abed..0000000
--- a/3 resources/TailwindCSS/Prevent overflow.md
+++ /dev/null
@@ -1,3 +0,0 @@
-When creating the wedding invitation I had an issue where the page would allow
-scroll horizontally because the flower on the top-right was too big.
-Adding the tailwindcss class `overflow-hidden` basically hides all parts that overflow from the container.
diff --git a/3 resources/Taskwarrior.md b/3 resources/Taskwarrior.md
deleted file mode 100644
index 34fe640..0000000
--- a/3 resources/Taskwarrior.md
+++ /dev/null
@@ -1,4 +0,0 @@
-`task add something +label`
-`task context none`
-`task add highprio thing +label priority:H`
-`task context define mycontext +label project:blaat`
diff --git a/3 resources/Technical definitions.md b/3 resources/Technical definitions.md
deleted file mode 100644
index 3801a9c..0000000
--- a/3 resources/Technical definitions.md
+++ /dev/null
@@ -1,6 +0,0 @@
-#definitions
-
-**Slug**
-A user-friendly representation of the name of a page used in the path of an URL.
-For example a page titled: My Friends And I, would be referenced via its slug: my-friends-and-i or my-friends-i.
-It can be optimized for brevity so its easier to type and remember.
diff --git a/3 resources/ansible/ad-hoc-commands.md b/3 resources/ansible/ad-hoc-commands.md
deleted file mode 100644
index eda1265..0000000
--- a/3 resources/ansible/ad-hoc-commands.md
+++ /dev/null
@@ -1,25 +0,0 @@
-Using ansible we can perform ad-hoc commands, useful for a one-off thing that won't require writing a full playbook.
-
-Some examples include:
-update apt cache:
-```
-ansible <pattern> -m ansible.builtin.apt -a "update_cache=true cache_valid_time=3600"
-```
-
-update packages:
-```
-ansible <pattern> -m ansible.builtin.apt -a "name=* state=latest"
-```
-
-run puppet:
-```
-ansible <pattern> -a "/opt/puppetlabs/bin/puppet agent --test"
-```
-
-reboot:
-```
-ansible <pattern> -m ansible.builtin.reboot -f 1
-```
-
-[[ansible]]
-#ansible
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diff --git a/3 resources/ansible/ansible.md b/3 resources/ansible/ansible.md
deleted file mode 100644
index 5886288..0000000
--- a/3 resources/ansible/ansible.md
+++ /dev/null
@@ -1 +0,0 @@
-At its heart it's just an abstraction over running commands remotely over SSH. It enables some powerful automation like setting up a server following a predetermined script.
\ No newline at end of file
diff --git a/3 resources/ansible/build-array-loop.md b/3 resources/ansible/build-array-loop.md
deleted file mode 100644
index 15f441f..0000000
--- a/3 resources/ansible/build-array-loop.md
+++ /dev/null
@@ -1,6 +0,0 @@
-How to construct an array variable containing results of an iterative ansible task?
-Use register. The referenced variable will contain a property results which is a list containing the combined outputs of the loop.
-
-https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_loops.html#registering-variables-with-a-loop
-
-[[ansible]]
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diff --git a/3 resources/ansible/build-list-silences.md b/3 resources/ansible/build-list-silences.md
deleted file mode 100644
index dc8ef61..0000000
--- a/3 resources/ansible/build-list-silences.md
+++ /dev/null
@@ -1 +0,0 @@
-Explain what I did today at work to build a list of silences and then have one task to unsilence all of them.
\ No newline at end of file
diff --git a/3 resources/ansible/debug.md b/3 resources/ansible/debug.md
deleted file mode 100644
index 552af1f..0000000
--- a/3 resources/ansible/debug.md
+++ /dev/null
@@ -1,29 +0,0 @@
-```
-- name: Print the gateway for each host when defined
-  ansible.builtin.debug:
-    msg: System {{ inventory_hostname }} has gateway {{ ansible_default_ipv4.gateway }}
-  when: ansible_default_ipv4.gateway is defined
-
-- name: Get uptime information
-  ansible.builtin.shell: /usr/bin/uptime
-  register: result
-
-- name: Print return information from the previous task
-  ansible.builtin.debug:
-    var: result
-    verbosity: 2
-
-- name: Display all variables/facts known for a host
-  ansible.builtin.debug:
-    var: hostvars[inventory_hostname]
-    verbosity: 4
-
-- name: Prints two lines of messages, but only if there is an environment value set
-  ansible.builtin.debug:
-    msg:
-    - "Provisioning based on YOUR_KEY which is: {{ lookup('ansible.builtin.env', 'YOUR_KEY') }}"
-    - "These servers were built using the password of '{{ password_used }}'. Please retain this for later use."
-```
-
----
-https://docs.ansible.com/ansible/latest/collections/ansible/builtin/debug_module.html
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diff --git a/3 resources/ansible/default-filter.md b/3 resources/ansible/default-filter.md
deleted file mode 100644
index 2255e71..0000000
--- a/3 resources/ansible/default-filter.md
+++ /dev/null
@@ -1,7 +0,0 @@
-Using the default filter, if we reference an undefined variable we can set a default: `{{ var | default([]) }}`.
-
-defaults:
-- int
-- str
-- list ([])
-- dict ({})
\ No newline at end of file
diff --git a/3 resources/ansible/delegate-to.md b/3 resources/ansible/delegate-to.md
deleted file mode 100644
index 270ccb1..0000000
--- a/3 resources/ansible/delegate-to.md
+++ /dev/null
@@ -1,3 +0,0 @@
-Through the use of delegate to, we can run a task for certain nodes and delegate work on behalf of those nodes to other hosts.
-
-A great example of usage is this:
diff --git a/3 resources/ansible/dicts.md b/3 resources/ansible/dicts.md
deleted file mode 100644
index eac3d1b..0000000
--- a/3 resources/ansible/dicts.md
+++ /dev/null
@@ -1 +0,0 @@
-Merged using combine: `{{ dict1 | ansible.builtin.combine(dict2) }}`
\ No newline at end of file
diff --git a/3 resources/ansible/extra-vars.md b/3 resources/ansible/extra-vars.md
deleted file mode 100644
index 07b0764..0000000
--- a/3 resources/ansible/extra-vars.md
+++ /dev/null
@@ -1,8 +0,0 @@
-We can pass variables to the ansible upon invoking it using `--extra-vars` or `-e`.
-
-```
---extra-vars "blaat=piet henk=joop"
---extra-vars '{"blaat":"piet","henk":"joop"}'
---extra-vars "@file.json"
---extra-vars "@file.yml"
-```
diff --git a/3 resources/ansible/find.md b/3 resources/ansible/find.md
deleted file mode 100644
index 1f4de51..0000000
--- a/3 resources/ansible/find.md
+++ /dev/null
@@ -1,9 +0,0 @@
-```
-- name: Find file with size >= 50G
-  ansible.builtin.find:
-    paths:
-      - /var/lib/nova/instances/_base
-    size: 50g
-```
----
-https://docs.ansible.com/ansible/latest/collections/ansible/builtin/find_module.html
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diff --git a/3 resources/ansible/loop-output.md b/3 resources/ansible/loop-output.md
deleted file mode 100644
index 30a0848..0000000
--- a/3 resources/ansible/loop-output.md
+++ /dev/null
@@ -1 +0,0 @@
-Using the label field we can select what to print, instead of the whole item.
\ No newline at end of file
diff --git a/3 resources/ansible/loop-register.md b/3 resources/ansible/loop-register.md
deleted file mode 100644
index bab52a5..0000000
--- a/3 resources/ansible/loop-register.md
+++ /dev/null
@@ -1,41 +0,0 @@
-When using a loop the registered variable will contain the results of all the responses:
-```JSON
-{
-    "changed": true,
-    "msg": "All items completed",
-    "results": [
-        {
-            "changed": true,
-            "cmd": "echo \"one\" ",
-            "delta": "0:00:00.003110",
-            "end": "2013-12-19 12:00:05.187153",
-            "invocation": {
-                "module_args": "echo \"one\"",
-                "module_name": "shell"
-            },
-            "item": "one",
-            "rc": 0,
-            "start": "2013-12-19 12:00:05.184043",
-            "stderr": "",
-            "stdout": "one"
-        },
-        {
-            "changed": true,
-            "cmd": "echo \"two\" ",
-            "delta": "0:00:00.002920",
-            "end": "2013-12-19 12:00:05.245502",
-            "invocation": {
-                "module_args": "echo \"two\"",
-                "module_name": "shell"
-            },
-            "item": "two",
-            "rc": 0,
-            "start": "2013-12-19 12:00:05.242582",
-            "stderr": "",
-            "stdout": "two"
-        }
-    ]
-}
-```
-
-Thus we can loop over each results `{{ registered_var.results }}`.
\ No newline at end of file
diff --git a/3 resources/ansible/loop-results-prior-loop.md b/3 resources/ansible/loop-results-prior-loop.md
deleted file mode 100644
index cbd50a2..0000000
--- a/3 resources/ansible/loop-results-prior-loop.md
+++ /dev/null
@@ -1,30 +0,0 @@
-```YAML
-- name: First loop
-  loop: {{ blaat }}
-  register: loooped
-  ...
-
-- name: Second loop
-  loop: {{ loooped.results }}
-  when: item.skipped is not defined
-```
-
-this loops over results of prior loop only but does not process any skipped results.
-
-In case the results array contains another array that we want to loop over, for example when we did a shell command in a loop we can use extract:
-```
-- name: Print magic
-  ansible.builtin.debug:
-    msg: "{{ ['stdout_lines'] | map('extract', item) }}"
-    loop: "{{ magic.results }}"
-```
-
-A cool example of this in practice:
-```
-- name: Print blockpull command
-  ansible.builtin.debug:
-    msg: "virsh blockpull {{ ['stdout_lines'] | map('extract', item) | list | flatten | join(' ') }}"
-  loop: "{{ domain_and_disk_paths.results }}"
-  loop_control:
-    label: "{{ inventory_hostname }}"
-```
\ No newline at end of file
diff --git a/3 resources/ansible/nested-loops.md b/3 resources/ansible/nested-loops.md
deleted file mode 100644
index fded56a..0000000
--- a/3 resources/ansible/nested-loops.md
+++ /dev/null
@@ -1,3 +0,0 @@
-Nested loops can be done not by nesting loops over two separate lists, but by looping over the [[Cartesian product]] of the two using the `product` filter.
-
-`{{ list1 | product(list) | list }}`
\ No newline at end of file
diff --git a/3 resources/ansible/set-facts.md b/3 resources/ansible/set-facts.md
deleted file mode 100644
index e94eeb6..0000000
--- a/3 resources/ansible/set-facts.md
+++ /dev/null
@@ -1 +0,0 @@
-These can be used to set and update variables specific to nodes, at runtime. 
\ No newline at end of file
diff --git a/3 resources/libvirt/Mediated devices.md b/3 resources/libvirt/Mediated devices.md
deleted file mode 100644
index fe9e551..0000000
--- a/3 resources/libvirt/Mediated devices.md
+++ /dev/null
@@ -1,11 +0,0 @@
-#libvirt #linux #virtualisation 
-
----
-https://libvirt.org/drvnodedev.html#mediated-devices-mdevs
-
-They are virtual devices that share a single physical device.
-
-Similar to [[SR-IOV]] but sr-iov required registering and unregistering devices with the host PCIe bus via a host driver. 
-Mediated devices don't have to do this.
-
-So why would we still choose sriov?
\ No newline at end of file
diff --git a/3 resources/libvirt/SR-IOV.md b/3 resources/libvirt/SR-IOV.md
deleted file mode 100644
index 0881ec0..0000000
--- a/3 resources/libvirt/SR-IOV.md
+++ /dev/null
@@ -1,9 +0,0 @@
-#linux #libvirt #virtualisation
-
----
-Single root input/output virtualization: enables sharing of single PCI-e devices with multiple guests.
-
-Physical device = PF (Physical Function)
-Virtual device = VF (Virtual Function)
-
-A PF is divided (by manufacturer) into *n* VFs. Thus a PF can be shared at most with *n* guests.
\ No newline at end of file
diff --git a/3 resources/linux/APT.md b/3 resources/linux/APT.md
deleted file mode 100644
index 9231d40..0000000
--- a/3 resources/linux/APT.md
+++ /dev/null
@@ -1,5 +0,0 @@
-#linux #packages #how-to
-
----
-reinstall packages:
-`apt reinstall <pkg>`
\ No newline at end of file
diff --git a/3 resources/linux/Definitions.md b/3 resources/linux/Definitions.md
deleted file mode 100644
index c0ca4dd..0000000
--- a/3 resources/linux/Definitions.md
+++ /dev/null
@@ -1,6 +0,0 @@
-#linux #definitions 
-
----
-NBP = Network Bootstrap Program
-PXE = Preboot Execution  Environment
-NIC = Network Interface Card
\ No newline at end of file
diff --git a/3 resources/linux/Device drivers.md b/3 resources/linux/Device drivers.md
deleted file mode 100644
index 95f1a75..0000000
--- a/3 resources/linux/Device drivers.md
+++ /dev/null
@@ -1,22 +0,0 @@
-#linux #devices 
-
----
-major, minor numbers
-major = driver (used by kernel when opening device to dispatch to correct driver)
-minor = used by driver to differentiate device(s)
-
-after disk the major, minor numbers are shown:
-```
-[jasras@n04.compute.vps2-lej1 ~]$ ls -l /dev/dm-*
-brw-rw---- 1 root disk 253,  0 Oct 25 10:10 /dev/dm-0
-brw-rw---- 1 root disk 253,  1 Oct 25 10:11 /dev/dm-1
-brw-rw---- 1 root root 253, 11 Oct 28 19:58 /dev/dm-11
-brw-rw---- 1 root root 253, 12 Oct 28 19:58 /dev/dm-12
-```
-
-available devices: `cat /proc/devices`
-
-character devices vs block devices; what is the difference?
-
----
-[oreilly-device-drivers](https://www.oreilly.com/library/view/linux-device-drivers/0596000081/ch03s02.html)
\ No newline at end of file
diff --git a/3 resources/linux/Device mapper.md b/3 resources/linux/Device mapper.md
deleted file mode 100644
index 059a0d1..0000000
--- a/3 resources/linux/Device mapper.md
+++ /dev/null
@@ -1,28 +0,0 @@
-#linux #device-mapper
-
----
-Device mapper is a kernel driver to map physical block devices to virtual ones; this means that for example we can have many physical devices be represented by a single virtual one (linear mapping).
-
-How does it work?
-[[1 projects/Inwerken Mohammed/TODO]]
-What is its function in relation to multipath?
-
-Logical devices using device-mapper can be managed using `man 8 dmsetup`
-```
-[jasras@n04.compute.vps2-lej1 ~]$ sudo dmsetup info 3600a098038314d736724566a67346538
-Name:              3600a098038314d736724566a67346538
-State:             ACTIVE
-Read Ahead:        256
-Tables present:    LIVE
-Open count:        1
-Event number:      3
-Major, minor:      253, 12
-Number of targets: 1
-UUID: mpath-3600a098038314d736724566a67346538
-```
-
-If dmsetup cannot remove a device because a process still has it open, but lsof does not show any processes that open it, use `-f` which replaces the device with a fake that rejects all I/O.
-
----
-[device-mapper](https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/7/html/logical_volume_manager_administration/device_mapper#device_mapper)
-[dmsetup](https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/7/html/logical_volume_manager_administration/dmsetup#dmsetup)
\ No newline at end of file
diff --git a/3 resources/linux/LSOF.md b/3 resources/linux/LSOF.md
deleted file mode 100644
index 5a3aa95..0000000
--- a/3 resources/linux/LSOF.md
+++ /dev/null
@@ -1,69 +0,0 @@
-#linux #how-to 
-
----
-
-```
-lsof -p 1111 # show open files for this PID
-lsof /path/to/file # show which process has this open
-```
-
-A usage in the wild; using lsof to find the qemu process for a specific base image and using that to get instance name and disk path:
-```
-lsof -F p {{ item['path'] }} | cut -b 2- | head -1 | xargs ps | grep -oP '(instance\\-[a-z0-9]+)|(\\/var\\/lib\\/nova\\/instances\\/[a-z0-9\\-]+\\/disk)' | uniq
-```
-
-(man lsof: search "OUTPUT FOR OTHER PROGRAMS")
-output for other programs
-```
-specify -F
-These are the fields that lsof will produce.  The single character listed first is the field identifier.
-            a    file access mode
-            c    process command name (all characters from proc or
-                 user structure)
-            C    file structure share count
-            d    file's device character code
-            D    file's major/minor device number (0x<hexadecimal>)
-            f    file descriptor (always selected)
-            F    file structure address (0x<hexadecimal>)
-            G    file flaGs (0x<hexadecimal>; names if +fg follows)
-            g    process group ID
-            i    file's inode number
-            K    tasK ID
-            k    link count
-            l    file's lock status
-            L    process login name
-            m    marker between repeated output
-            M    the task comMand name
-            n    file name, comment, Internet address
-            N    node identifier (ox<hexadecimal>
-            o    file's offset (decimal)
-            p    process ID (always selected)
-            P    protocol name
-            r    raw device number (0x<hexadecimal>)
-            R    parent process ID
-            s    file's size (decimal)
-            S    file's stream identification
-            t    file's type
-            T    TCP/TPI information, identified by prefixes (the
-                 `=' is part of the prefix):
-                     QR=<read queue size>
-                     QS=<send queue size>
-                     SO=<socket options and values> (not all dialects)
-                     SS=<socket states> (not all dialects)
-                     ST=<connection state>
-                     TF=<TCP flags and values> (not all dialects)
-                     WR=<window read size>  (not all dialects)
-                     WW=<window write size>  (not all dialects)
-                 (TCP/TPI information isn't reported for all supported
-                   UNIX dialects. The -h or -? help output for the
-                   -T option will show what TCP/TPI reporting can be
-                   requested.)
-            u    process user ID
-            z    Solaris 10 and higher zone name
-            Z    SELinux security context (inhibited when SELinux is disabled)
-            0    use NUL field terminator character in place of NL
-            1-9  dialect-specific field identifiers (The output
-                 of -F? identifies the information to be found
-                 in dialect-specific fields.)
-
-```
\ No newline at end of file
diff --git a/3 resources/linux/Users.md b/3 resources/linux/Users.md
deleted file mode 100644
index 885a7cc..0000000
--- a/3 resources/linux/Users.md
+++ /dev/null
@@ -1,22 +0,0 @@
-#linux #user-management 
-
-Change uid/gid of user
-`usermod -u newnumber user`
-`groupmod -g newnumber user`
-
-File permissions in homedir will be automatically updated; file perms outside home dir will not be automatically updated.
-
-Finding files of a specific user, and printing their uid/gid;
-`sudo find / -user 4109 -printf '%p %u(%U) %g(%G)\n'`
-
-To change only the group: `chgrp`.
-
-Or using find to chmod/chgrp:
-`sudo find / -user 4109 -group 4109 -exec chmod 998:998 {} \;`
-`sudo find / -group 4109 -exec chgrp 998 {} \;`
-
-Dirty way to find "system users" (uid < 999) - note that this is not fool-proof, it also lists groups
-`getent passwd | grep -oP '\b[0-9]{3}\b' | uniq | sort`
-
----
-https://www.cyberciti.biz/faq/linux-change-user-group-uid-gid-for-all-owned-files/
diff --git a/3 resources/linux/Watch.md b/3 resources/linux/Watch.md
deleted file mode 100644
index 0c167b7..0000000
--- a/3 resources/linux/Watch.md
+++ /dev/null
@@ -1,4 +0,0 @@
-#linux #how-to 
-
----
-`watch (1)` periodically executes the executable on argv. It can be used to reload the output of a command, like `sudo watch ovs-dpctl dump-flows` .
diff --git a/3 resources/linux/filesystems/Tmpfs.md b/3 resources/linux/filesystems/Tmpfs.md
deleted file mode 100644
index b8fe839..0000000
--- a/3 resources/linux/filesystems/Tmpfs.md
+++ /dev/null
@@ -1,16 +0,0 @@
-#linux #filesystem
-
----
-Is a [[virtual filesystem]] that is stored in memory; it uses both RAM and swap space.
-> Kernel option: CONFIG_TMPFS
-
-`mount -t tmpfs source target`
-
-A tmpfs can only grow to 50% of RAM avail. unless overridden with size=nbytes mount option. 
-Only consumes RAM for actual usage.
-Data is ephemeral/volatile.
-
-Mount stacking: mount over existing /tmp, to improve speed of apps using alot of tmp files, then unmount to delete data.
-
-Kernel uses tmpfs for [[system v shared memory]] and [[shared anonymous memory mappings]].
-`/dev/shm` or `/run/shm`: [[glibc]] of [[POSIX]] shared memory and [[POSIX]] semaphores.
\ No newline at end of file
diff --git a/3 resources/linux/networking/DHCP.md b/3 resources/linux/networking/DHCP.md
deleted file mode 100644
index e7e8e38..0000000
--- a/3 resources/linux/networking/DHCP.md
+++ /dev/null
@@ -1,5 +0,0 @@
-#networking #linux 
-
----
-Dynamic Host Configuration Protocol
-Allows hosts dynamically receive an IP address.
\ No newline at end of file
diff --git a/3 resources/linux/networking/IP masquerade.md b/3 resources/linux/networking/IP masquerade.md
deleted file mode 100644
index 2ccc8e6..0000000
--- a/3 resources/linux/networking/IP masquerade.md
+++ /dev/null
@@ -1,17 +0,0 @@
-#linux #networking 
-
----
-A function in the kernel that allows guests with internal/private IPs to access the internet by using the hosts' public IP similar to 1 to many NAT.
-
-Differences with Proxy, IP Masq, NAT:
-
-**Proxy**
-Requires special configuration on internal client side. Can be used for caching.
-
-**IP Masq**
-A form of NAT used primarily in Linux devices. Translates IP address and uses the connection tracking table and ports to map responses back to the internal connection.
-
-**NAT**
-Has different types with different use-cases.
-Static NAT: 1-1 mapping of pub/private IP. Dynamic NAT: pool of pub ips to dynamically map private IPs to based on availability. 
-PAT (Port): similar to IP Masq; 1-many using ports.
\ No newline at end of file
diff --git a/3 resources/linux/networking/PXE.md b/3 resources/linux/networking/PXE.md
deleted file mode 100644
index d5fe4d1..0000000
--- a/3 resources/linux/networking/PXE.md
+++ /dev/null
@@ -1,18 +0,0 @@
-#linux #pxe
-
----
-The NBP is a bootloader that is obtained via the network typically via [[TFTP]]. It handles setting up an environment in which an OS can run or install. For example, it displays a boot menu and downloads the kernel images. It sets up hardware, for example the [[NIC]]s.
-
-PXE boot process:
-1. Modified [[DHCP]] request: request to include boot information (PXE boot request).
-2. Process DHCP response which includes an IP address of [[TFTP]] server and filename of [[NBP]].
-3. Download NBP over TFTP.
-4. NBP executes
-	1. Loads additional stuff over network, like kernel images.
-	2. Handles the boot menu
-5. Kernel takes over boot process and potentially downloads additional files required to complete booting.
-
-Popular NBP's:
-- PXELINUX
-- iPXE
-- GRUB2
diff --git a/3 resources/math/Cartesian product.md b/3 resources/math/Cartesian product.md
deleted file mode 100644
index 161b405..0000000
--- a/3 resources/math/Cartesian product.md
+++ /dev/null
@@ -1,4 +0,0 @@
-#math #definitions 
-
----
-The Cartesian product in [[set theory]] denoted as A x B where A and B are both sets and it would result in pairs of (a, b) for each a and b in A and B respectively.
\ No newline at end of file
diff --git a/3 resources/nix/Flake.md b/3 resources/nix/Flake.md
deleted file mode 100644
index 754556f..0000000
--- a/3 resources/nix/Flake.md
+++ /dev/null
@@ -1,22 +0,0 @@
-#nix #flake
-
----
-Nix flakes are source trees containing a file `flake.nix` at their root. The file `flake.nix` provides a standardized way to provide [[Zettelkast/Index/Nix]] artifacts. It's like a package manager for [[Zettelkast/Index/Nix]]. A flake can be dependent on other Flakes and it's possible to pin dependencies to exact revisions by using a `flake.lock` file.
-
-Nix flake evaluation is hermetic, meaning that it produces the same result wherever it's built.k
-
-The feature can be enabled in `~/.config/nix/nix.conf`:
-
-```
-experimental-features = nix-command flakes
-```
-
-To initialize in a repo: `nix flake init`.
-
-In flakes dependencies have to be specified explicitly and MUST be locked to specific versions therefore it's no longer allowed to use the nixpkgs found in `NIX_PATH` by referencing it like `<nixpkgs>`.
-
-Output of a Flake is an arbitrary [[Zettelkast/Index/Nix]] value such as a package, [[NixOS]] module or library function.
-Commands `nix build` and `nix shell` will build the output `packages.<system>.default` unless we specify another output, for example: `nix shell .#checks.aarch64-linux.build`.
-
----
-[Flakes Wiki](https://nixos.wiki/wiki/Flakes)
\ No newline at end of file
diff --git a/3 resources/nix/Overlays.md b/3 resources/nix/Overlays.md
deleted file mode 100644
index 8ee33f3..0000000
--- a/3 resources/nix/Overlays.md
+++ /dev/null
@@ -1,11 +0,0 @@
-#nix #overlay 
-
----
-Functions that accept two args (conventionally: final, prev) and return a set of [[Package]]s.
-
-The `prev` arguments holds the set of packages of the "parent" overlay while the `final` argument holds the end result of **all** overlays applied. This means that overlays depend on each other. It is unclear how we can tell on which overlay an overlay depends.
-
-We can use it to override existing packages or add new packages.
-
----
-https://nixos.wiki/wiki/Overlays
diff --git a/3 resources/nix/Package.md b/3 resources/nix/Package.md
deleted file mode 100644
index 32c6bd4..0000000
--- a/3 resources/nix/Package.md
+++ /dev/null
@@ -1,6 +0,0 @@
-#nix #packages 
-
----
-Packages != NixOS Modules
-
-Packages come from Nixpkgs.
\ No newline at end of file
diff --git a/3 resources/nix/REPL.md b/3 resources/nix/REPL.md
deleted file mode 100644
index 210b980..0000000
--- a/3 resources/nix/REPL.md
+++ /dev/null
@@ -1,5 +0,0 @@
-#nix #repl
-
----
-`nix repl` to interactively evaluate Nix expressions. `:p` if output is not full.
- `nix-instantiate --eval <file>.nix` to evaluate a Nix expression from a file. `--strict`.
\ No newline at end of file
diff --git a/3 resources/nix/Shell.nix.md b/3 resources/nix/Shell.nix.md
deleted file mode 100644
index 13715c2..0000000
--- a/3 resources/nix/Shell.nix.md
+++ /dev/null
@@ -1,42 +0,0 @@
-#nix #shell
-
----
-Can be used to set up per dir environments, e.g using direnv to automatically activate them.
-## Python
-https://nixos.org/manual/nixpkgs/stable/#python
-
-```nix
-{ pkgs ? import <nixpkgs> {}}:
-
-pkgs.mkShell {
-    packages = [ pkgs.virtualenv ];
-}
-```
-
-```nix
-with import <nixpkgs> {};
-let
-	my_toolz = python311.pkgs.buildPythonPackage rec { 
-		pname = "toolz";
-		version = "0.10.0";
-		pyproject = true;
-		src = fetchPypi {
-			inherit pname version;
-			hash = "sha256-CP3V73yWSArRHBLUct4hrNMjWZlvaaUlkpm1QP66RWA=";
-		};
-		nativeBuildInputs = [
-			python311.pkgs.setuptools
-			python311.pkgs.wheel
-		]; # has no tests
-		doCheck = false;
-		meta = {
-			homepage = "https://github.com/pytoolz/toolz/";
-			description = "List processing tools and functional utilities";
-			# [...]
-		};
-	};
-in python311.withPackages (ps: with ps; [ numpy my_toolz ]) ).env
-```
-
-The [[Import]] is required here because imports a nix expression from another source, in this case nixpkgs.
-It is not required at line two, because python310Packages itself is already in the local scope.
\ No newline at end of file
diff --git a/3 resources/nix/language/Import.md b/3 resources/nix/language/Import.md
deleted file mode 100644
index d201c74..0000000
--- a/3 resources/nix/language/Import.md
+++ /dev/null
@@ -1,5 +0,0 @@
-#nix #keyword
-
----
-The import keyword brings a Nix expression from another source into scope such that we can reference it. For example, we can `import <nixpkgs>` and it would bring the entire attribute set that is Nixpkgs into scope and allows us to reference any of its attributes.
-
diff --git a/3 resources/nix/language/Let.md b/3 resources/nix/language/Let.md
deleted file mode 100644
index bfb4b31..0000000
--- a/3 resources/nix/language/Let.md
+++ /dev/null
@@ -1,12 +0,0 @@
-#nix #keyword
-
----
-Keyword: `let`
-Used to assign variables that can be used in an expression immediately following the let-binding.
-```nix
-let
-  one = 1;
-in {
-  two = one + 1;
-}
-```
diff --git a/3 resources/nix/language/Rec.md b/3 resources/nix/language/Rec.md
deleted file mode 100644
index b7050d3..0000000
--- a/3 resources/nix/language/Rec.md
+++ /dev/null
@@ -1,20 +0,0 @@
-#nix #keyword 
-
----
-Recursive attribute sets can reference values declared earlier in the same set. 
-keyword: `rec`
-```nix
-rec {
-  one = 1;
-  two = one + 1;
-}
-```
-
-Ordering does not matter:
-```nix
-nix-repl> rec { two = one + 1; one = 1; }
-{
-  one = 1;
-  two = 2;
-}
-```
diff --git a/3 resources/nix/language/With.md b/3 resources/nix/language/With.md
deleted file mode 100644
index b291907..0000000
--- a/3 resources/nix/language/With.md
+++ /dev/null
@@ -1,15 +0,0 @@
-#nix #keyword 
-
----
-The  `with` keyword brings all attributes from a given set, e.g nixpkgs, into the local scope. Making them accessible as if they were declared in the same file.
-
-An example, bringing everything from nixpkgs into scope:
-```
-with import <nixpkgs>;
-with python310Packages; <-- declared in nixpkgs
-
-buildPythonPackage <-- declared in python310Packages
-```
-
-The import statement is required here because imports a nix expression from another source, in this case nixpkgs.
-It is not required at line two, because python310Packages itself is already in the local scope.
\ No newline at end of file
diff --git a/3 resources/nix/packages/Apply custom patches.md b/3 resources/nix/packages/Apply custom patches.md
deleted file mode 100644
index 370c53a..0000000
--- a/3 resources/nix/packages/Apply custom patches.md
+++ /dev/null
@@ -1,17 +0,0 @@
-#nix #packages #overlay
-
----
-We can apply patches to existing packages using [[Overlays]]:
-```nix
-final: prev {
-  nova = prev.nova.overrideAttrs (old: {
-	  patches = (old.patches or []) ++ [
-		  prev.fetchpatch {
-			url = "https://github.com/owner/repo/commit/hash.patch";
-		    hash = "somehash";
-		})
-		./relative.patch
-	  ]
-  })
-}
-```
diff --git a/3 resources/openstack/Creating ports.md b/3 resources/openstack/Creating ports.md
deleted file mode 100644
index 90223bf..0000000
--- a/3 resources/openstack/Creating ports.md
+++ /dev/null
@@ -1,4 +0,0 @@
-#openstack #port
-
----
-Creating a port with a fixed IP requires admin privileges. It is not sufficient to have an RBAC policy that shares the network with a tenant.
\ No newline at end of file
diff --git a/3 resources/openstack/Libvirt pmsuspended.md b/3 resources/openstack/Libvirt pmsuspended.md
deleted file mode 100644
index 4749c76..0000000
--- a/3 resources/openstack/Libvirt pmsuspended.md
+++ /dev/null
@@ -1,6 +0,0 @@
-#openstack #libvirt
-
----
-Encountered a guest running some desktop image that sleeps and puts libvirt domain in state pmsuspend.
-
-Openstack does not sync power states in this case so the nova instance is still ACTIVE.
\ No newline at end of file
diff --git a/3 resources/openstack/Nova live migration volume.md b/3 resources/openstack/Nova live migration volume.md
deleted file mode 100644
index 8b37f67..0000000
--- a/3 resources/openstack/Nova live migration volume.md
+++ /dev/null
@@ -1,18 +0,0 @@
-#openstack #nova #live-migration #volume
-
-
----
-Table cinder.volume_attachment, contains which volume_driver. target_lun `(<n>)` here maps to `dm-<n>`.
-Luns are not unique across pod, each node has a target_lun 2 and thus dm-2 connected.
-
-os-brick is responsible for connecting volumes;
-if connection_info it receives contains target_iqns, target_luns etc it will not do a scan and just returns those. 
-`@see os_brick/initiator/connectors/iscsi.py`
-
-`nova/virt/libvirt/driver.py -> def _connect_volume` does attaching of volumes using os-brick. Driver exposes some methods that do this and are called elsewhere: `swap_volume`, `attach_volume`, `pre_live_migration`. 
-
-`pre_live_migration` is called by `nova/compute/manager.py`
-
-So in `nova/compute/manager.py` there is a function that does the rollback, and it rollbacks bdm's and deletes volume attachments before it calls `rollback_live_migration_at_destination` which in turn makes an attempt at deleting the actual volume attachment to the node. But at that point all objects have been rollbacked already so it has invalid information.
-
-If the code in new versions of openstack isn't any different i'll just make a bug report and see what they come up with.