• environment
  • install
  • upgrade
  • completion
• ansible-vault
  • encrypted files
  • prompt for the password
  • reset key
  • encrypt
  • decrypt
  • view
• ansible-galaxy
• ansible-playbook
  • tags
• ansible-config
  • get all default
• plugin
  • lookup
• troubleshooting

[!NOTE|label:references:]

• Ansible 详解（四）：Ansible-vault
• Ansible中文权威指南
  • Vault
  • Playbooks
• Ansible Documentation
  • Installing Ansible
  • Protecting sensitive data with Ansible vault
  • * Ansible Vault
  • Tips and tricks
  • ansible.builtin.template
• 10 ansible vault examples to decrypt/encrypt string & files
• * Filters
• 用 Ansible 实现网络自动化

environment

$ sudo dnf install wget yum-utils make gcc openssl-devel bzip2-devel libffi-devel zlib-devel
$ sudo dnf groupinstall 'development tools
$ sudo dnf -y install epel-release
$ sudo dnf install python39
$ sudo update-alternatives --config python
$ sudo update-alternatives --config python3

install

$ python -m pip install --user ansible

• install for development

  $ python -m pip install --user https://github.com/ansible/ansible/archive/devel.tar.gz
  

upgrade

$ python -m pip install --user --upgrade ansible

completion

$ python -m pip install --user argcomplete
$ cat >> ~/.bashrc << EOF
  command -v ansible > /dev/null && eval $(register-python-argcomplete ansible)
                                 && eval $(register-python-argcomplete ansible-config)
                                 && eval $(register-python-argcomplete ansible-console)
                                 && eval $(register-python-argcomplete ansible-doc)
                                 && eval $(register-python-argcomplete ansible-galaxy)
                                 && eval $(register-python-argcomplete ansible-inventory)
                                 && eval $(register-python-argcomplete ansible-playbook)
                                 && eval $(register-python-argcomplete ansible-pull)
                                 && eval $(register-python-argcomplete ansible-vault)
EOF

• completion.bash

  $ mkdir -p ~/.marslo/.completion
  $ git clone git@github.com:dysosmus/ansible-completion.git ~/.marslo/.completion/ansible-completion
  
  $ cat >> ~/.bashrc << EOF
  [ -d '~/.marslo/.completion/ansible-completion' ] && source <( cat ~/.marslo/.completion/ansible-completion/*.bash )
  EOF
  

  • or via ln

    $ ls -1 --color=none /path/to/ansible-completion/*.bash |
         xargs -t -I{} bash -c "ln -svf {} /usr/local/share/bash-completion/completions/\$(basename {} | awk -F'.' '{print \$1}')"
    

ansible-vault

[!NOTE]

• Encrypting content with Ansible Vault
• * iMarslo : check line ending
• * iMarslo : remove the ending '\n'

encrypted files

[!NOTE|label:references:]

• Why should text files end with a newline?
• Removing a newline character at the end of a file

  $ truncate -s -1 /path/to/yaml
  

• sed solution

  $ sed -z s/.$// pw.txt | od -c
  0000000   a   b   c
  0000003
  

• printf solution

  $ printf %s "$(< pw.txt)" | od -c
  0000000   a   b   c
  0000003
  

• head solution

  $ head -c -1 pw.txt | od -c
  0000000   a   b   c  \n   e   f   g
  0000007
  

$ truncate -s -1 foo.yml

$ ansible-vault create --vault-id @prompt foo.yml
New vault password (default):
Confirm new vault password (default):

$ cat foo.yml
$ANSIBLE_VAULT;1.1;AES256
65393763393937353538636266646432646265643531343530623436373462633663333234653032
6131396532663939376339306261616637316561343531350a393536353331343837653265383037
30343839316531666530336134623135313535336136653232653533643131303364306265393336
3234366662313332640a613963633766663061643064356530643863373138393039326466333638
3638

• create with name

  $ ansible-vault create --vault-id test@prompt foo.yml
  New vault password (test):
  Confirm new vault password (test):
  
  $ cat foo.yml
  $ANSIBLE_VAULT;1.2;AES256;test
  33303164313336626433376532306266633237333038653931386531616637666637626238346339
  3764383262343066636236626666613562363130636565630a313966376138323931333635333266
  32633330356132626637663534633165356133653639653130303839336338336261316362343065
  3964613438623337630a663735313836353566326333323732303232303864393063646432353463
  3631
  

prompt for the password

[!TIP] via --vault-id @prompt

• How to see special characters?
• be aware of the echo will automatically appending the \n in the end of the line:

  $ echo 'abc' | od -c
  0000000   a   b   c  \n
  0000004
  

• with echo -n

  $ echo -n 'abc' | od -c
  0000000   a   b   c
  0000003
  

$ echo -n 'Test123!' | ansible-vault encrypt_string --vault-id @prompt
New vault password (default):
Confirm new vault password (default):
Reading plaintext input from stdin. (ctrl-d to end input, twice if your content does not already have a newline)

Encryption successful
!vault |
          $ANSIBLE_VAULT;1.1;AES256
          62306630653236616438653236353135623936626332636337396432346235376364386233363938
          3930663634396138373139643031396433386339353634640a323938323431356330323363353335
          61636134636539326539623665393261643462396239653864313861393761633762313161386464
          3166333136366465370a323765386238646539613438333334633434613533373565326464383836
          6464

• or

  $ ansible-vault encrypt_string
  New Vault password:
  Confirm New Vault password:
  Reading plaintext input from stdin. (ctrl-d to end input, twice if your content does not already have a newline)
  abc^D                          # ctrl-d twice
  Encryption successful
  !vault |
            $ANSIBLE_VAULT;1.1;AES256
            39323234633365393633306135386362373463356636633937336236643763616232383832396333
            3136343265346534306638343738363435393964353262330a313331323161653832656365336331
            36356564653565613664666631346434306366666163393463633030363732336436346364613638
            3038303934366166320a633064326333623062663362343031633065333138313762353534643530
            633
  

reset key

$ ansible-vault rekey --vault-id @prompt /path/to/file

encrypt

$ ansible-vault encrypt --vault-id @prompt /path/to/file

decrypt

$ ansible-vault decrypt --vault-id @prompt /path/to/file

• decrypt from string

  # encrypt
  $ echo -n 'a' | ansible-vault encrypt_string
  Reading plaintext input from stdin. (ctrl-d to end input, twice if your content does not already have a newline)
  
  Encryption successful
  !vault |
            $ANSIBLE_VAULT;1.1;AES256
            63666334316139653431343330386139346466356439373263643566373062613666653362353738
            3630386133363464313964666230313062666662396161650a313165353966393136643932643434
            64306666613835333130613866303730623538313136323236653732663461623532343035626262
            3932643631653739350a306131666337633831653233623638396438386535623938626133653332
            3464
  
  # decrypt
  $ echo -n '$ANSIBLE_VAULT;1.1;AES256
  63666334316139653431343330386139346466356439373263643566373062613666653362353738
  3630386133363464313964666230313062666662396161650a313165353966393136643932643434
  64306666613835333130613866303730623538313136323236653732663461623532343035626262
  3932643631653739350a306131666337633831653233623638396438386535623938626133653332
  3464' | ansible-vault decrypt
  Decryption successful
  a
  

view

$ ansible-vault view --vault-id @prompt /path/to/file

ansible-galaxy

[!NOTE|label:references:]

• * Kubernetes Collection for Ansible
  • ansible-collections/kubernetes.core
  • kubernetes.core.k8s
• kubernetes.core
  • kubernetes.core.k8s
• Collections in the Kubernetes Namespace
• Kubernetes.Core
• installing roles and collections from the same requirements.yml file
• helm – Manages Kubernetes packages with the Helm package manager
• The Inside Playbook
  • Creating Kubernetes Dynamic Inventories with kubernetes.core Modules
  • * Automating Helm using Ansible
  • k8s_taint
  • Kubernetes Meets Event-Driven Ansible

$ ansible-galaxy collection install kubernetes.core

# or
$ ansible-galaxy install -r requirements.yml

• example

  deploy prometheus and grafana via ansbile+helm

  - name: Deploy latest version of Prometheus chart inside monitoring namespace (and create it)
    kubernetes.core.helm:
      name: test
      chart_ref: stable/prometheus
      release_namespace: monitoring
      create_namespace: true
  
  # From repository
  - name: Add stable chart repo
    kubernetes.core.helm_repository:
      name: stable
      repo_url: "https://kubernetes.github.io/ingress-nginx"
  
  - name: Deploy latest version of Grafana chart inside monitoring namespace with values
    kubernetes.core.helm:
      name: test
      chart_ref: stable/grafana
      release_namespace: monitoring
      values:
        replicas: 2
  
  - name: Deploy Grafana chart on 5.0.12 with values loaded from template
    kubernetes.core.helm:
      name: test
      chart_ref: stable/grafana
      chart_version: 5.0.12
      values: "{{ lookup('template', 'somefile.yaml') | from_yaml }}"
  
  - name: Deploy Grafana chart using values files on target
    kubernetes.core.helm:
      name: test
      chart_ref: stable/grafana
      release_namespace: monitoring
      values_files:
        - /path/to/values.yaml
  
  - name: Remove test release and waiting suppression ending
    kubernetes.core.helm:
      name: test
      state: absent
      wait: true
  
  - name: Separately update the repository cache
    kubernetes.core.helm:
      name: dummy
      namespace: kube-system
      state: absent
      update_repo_cache: true
  
  - name: Deploy Grafana chart using set values on target
    kubernetes.core.helm:
      name: test
      chart_ref: stable/grafana
      release_namespace: monitoring
      set_values:
        - value: phase=prod
          value_type: string
  
  # From git
  - name: Git clone stable repo on HEAD
    ansible.builtin.git:
      repo: "http://github.com/helm/charts.git"
      dest: /tmp/helm_repo
  
  - name: Deploy Grafana chart from local path
    kubernetes.core.helm:
      name: test
      chart_ref: /tmp/helm_repo/stable/grafana
      release_namespace: monitoring
  
  # From url
  - name: Deploy Grafana chart on 5.6.0 from url
    kubernetes.core.helm:
      name: test
      chart_ref: "https://github.com/grafana/helm-charts/releases/download/grafana-5.6.0/grafana-5.6.0.tgz"
      release_namespace: monitoring
  
  # Using complex Values
  - name: Deploy new-relic client chart
    kubernetes.core.helm:
      name: newrelic-bundle
      chart_ref: newrelic/nri-bundle
      release_namespace: default
      force: True
      wait: True
      replace: True
      update_repo_cache: True
      disable_hook: True
      values:
        global:
          licenseKey: "{{ nr_license_key }}"
          cluster: "{{ site_name }}"
        newrelic-infrastructure:
          privileged: True
        ksm:
          enabled: True
        prometheus:
          enabled: True
        kubeEvents:
          enabled: True
        logging:
          enabled: True
  

ansible-playbook

[!NOTE|label:references:]

• passwordless via environment variables

# without password
$ export ANSIBLE_VAULT_PASSWORD_FILE=/path/to/password.txt
$ ansible-playbook -i hosts /path/to/yaml

# with password
$ ansible-playbook -i hosts /path/to/yaml --vault-id @prompt

tags

[!NOTE|label:references]

• Special tags: always and never
• Use Ansible tags to save time on playbook runs

never

$ cat sample.yaml
---

- hosts: localhost
  gather_facts: False
  tasks:

    - name: Hello tag example
      debug:
        msg: "Hello!"
      tags:
        - hello

    - name: No tag example
      debug:
        msg: "How are you?"

    - name: Goodbye tag example
      debug:
        msg: "Goodbye!"
      tags:
        - goodbye
        - never                        # will not be executed unless using `--tags goodbye`

• result

  $ ansible-playbook sample.yaml
  
  PLAY [localhost] *************************************************************************
  TASK [Hello tag example] *****************************************************************
  ok: [localhost] => {
      "msg": "Hello!"
  }
  
  TASK [No tag example] ********************************************************************
  ok: [localhost] => {
      "msg": "How are you?"
  }
  
  PLAY RECAP *******************************************************************************
  localhost           : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
  

• result with --tags

  $ ansible-playbook sample.yaml --tags goodbye
  
  PLAY [localhost] *************************************************************************
  
  TASK [Goodbye tag example] ***************************************************************
  ok: [localhost] => {
      "msg": "Goodbye!"
  }
  
  PLAY RECAP *******************************************************************************
  localhost           : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
  

ansible-config

[!NOTE|label:referencs:]

• v2.4 Configuration file

get all default

$ ansible-config init --disabled -t all

• disable localhost warning

  $ cat ansible.cfg
  [defaults]
  localhost_warning=false
  

plugin

lookup

[!NOTE|label:references:]

• 自动化运维 | Ansible lookup

• sample code

  $ ls --color=none lookup* | xargs -n1 -t cat
  cat lookup-content.txt
  hello world
  
  cat lookup.yaml
  ---
  - hosts: localhost
    tasks:
    vars:
       contents: "{{ lookup('file', '/home/marslo/iMarslo/study/code/ansible/lookup-content.txt')}}"
    tasks:
       - debug: msg="the content of file lookup-content.txt is {{contents}}"
  

$ ansible-playbook lookup.yaml
PLAY [localhost] *************************************************************************

TASK [Gathering Facts] *******************************************************************
Monday 24 July 2023  17:43:51 -0700 (0:00:00.007)       0:00:00.007 ***********
ok: [localhost]

TASK [debug] *****************************************************************************
Monday 24 July 2023  17:43:51 -0700 (0:00:00.935)       0:00:00.943 ***********
ok: [localhost] => {}

MSG:

the content of file lookup-content.txt is hello world

PLAY RECAP *******************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

Monday 24 July 2023  17:43:52 -0700 (0:00:00.030)       0:00:00.974 ***********
===============================================================================
Gathering Facts ------------------------------------------------------------------- 0.94s
debug ----------------------------------------------------------------------------- 0.03s

troubleshooting

• generate the final yaml via ansible.builtin.template

  # in tasks/main.yaml
  - name: Template a file to local
    ansible.builtin.template:
      src: file_in_template.yaml
      dest: /local/path/to/yaml