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Fixed templating examples in ansible's notes

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Michele Cereda
2022-05-02 20:29:19 +02:00
parent c82555821e
commit 074baa33c7
1 changed files with 68 additions and 29 deletions
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97
knowledge base/ansible.md
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@@ -50,38 +50,69 @@ ansible-galaxy remove namespace.role
## Templating
```yaml
- name: Remove empty or false values from a list piping it to 'select()'
debug: msg="{{ [ '', 'string', 0, false ] | select }}" # ['string']
- name: Remove only empty strings from a list 'reject()'ing them
debug: msg="{{ [ '', 'string', 0, false ] | reject('match', '^$') }}" # ['string', 0, False]
- name: Check if a list contains an item and fail otherwise
when: item not in list
fail: msg="item not in list"
- name: Merge two lists
set_fact:
merged_lists: "{{ list_one + list_two }}"
- name: Dedupe elements in a list
set_fact:
deduped_list: "{{ list | unique }}"
- name: Sort list by version number (not lexicographically)
- name: >-
Remove empty or false values from a list piping it to 'select()'.
Returns ["string"] from ["", "string", 0, false].
vars:
ansible_versions: ['2.8.0', '2.11.0', '2.7.0', '2.10.0', '2.9.0']
list: ["", "string", 0, false]
debug:
var: ansible_versions | community.general.version_sort
var: list | select
- name: Compare a semver version number
when: semver_var is version('2.0.0-rc.1+build.123', 'ge', version_type='semver')
fail: msg="the given version is below the required one"
- name: Generate a random password
- name: >-
Remove only empty strings from a list 'reject()'ing them.
Returns ["string", 0, false] from ["", "string", 0, false].
vars:
passwd: "{{lookup('password', '/dev/null length=32 chars=ascii_letters,digits,punctuation')}}"
debug: msg="password={{passwd}}, sha={{passwd | password_hash('sha512')}}"
list: ["", "string", 0, false]
debug:
var: list | reject('match', '^$')
- name: >-
Merge two lists.
Returns ["a", "b", "c", "d"] from ["a", "b"] and ["c", "d"].
vars:
list1: ["a", "b"]
list2: ["c", "d"]
debug:
var: list1 + list2
- name: >-
Dedupe elements in a list.
Returns ["a", "b"] from ["a", "b", "b", "a"].
vars:
list: ["a", "b", "b", "a"]
debug:
var: list | unique
- name: >-
Sort list by version number (not lexicographically).
Returns ['2.7.0', '2.8.0', '2.9.0',, '2.10.0' '2.11.0'] from ['2.8.0', '2.11.0', '2.7.0', '2.10.0', '2.9.0']
vars:
list: ['2.8.0', '2.11.0', '2.7.0', '2.10.0', '2.9.0']
debug:
var: list | community.general.version_sort
- name: >-
Compare a semver version number.
Returns a boolean result.
debug:
var: "'2.0.0-rc.1+build.123' is version('2.1.0-rc.2+build.423', 'ge', version_type='semver')"
- name: >-
Generate a random password.
Returns a random string following the specifications.
vars:
password: "{{ lookup('password', '/dev/null length=32 chars=ascii_letters,digits,punctuation') }}"
debug:
var: password
- name: >-
Hash a password.
Returns a hash of the requested type.
vars:
password: abcd
salt: "{{ lookup('community.general.random_string', special=false) }}"
debug:
var: password | password_hash('sha512', salt)
```
## Roles
@@ -295,13 +326,21 @@ The `environment` keyword does not affect Ansible itself or its configuration se
### Set variables to the value of environment variables
Use `lookup()` with the 'env' option:
Use the `lookup()` plugin with the `env` option:
```yaml
- name: Use a local environment variable
debug: msg="HOME={{ lookup('env', 'HOME') }}"
```
### Check if a list contains an item and fail otherwise
```yaml
- name: Check if a list contains an item and fail otherwise
when: item not in list
fail: msg="item not in list"
```
## Further readings
- [Roles]