44 lines
1.6 KiB
Markdown
44 lines
1.6 KiB
Markdown
# Ansible
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## Adhoc commands
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**Generic**
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```
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ansible <hosts/groups pattern> -l <limit pattern> -m <module> -a "<module args>" -u <login user> --become --ask-become-pass
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```
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**Example**
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```
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ansible all -l localhost -m systemd -a "name=nginx state=restarted" -u test --become --ask-become-pass
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```
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## Usecases
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### Filter numbers from a list of strings
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`sample.result_list` is a list of lists containing stdout output. We want to filter some numbers from this output. To do this we first filter the correct lines by using the `json_query` filter. If you need to match a specific substring, you could use `select("match", "<regex>")` in combination with the `json_query`. Next we `map` the `regex_search` filter on all lines to extract the data we need. As the `map` filter is a Python generator object, we need to convert it to a list.
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The regex `(?<=\()\d+` uses a feature called *positive lookbehind*: `(?<=\()`. It matches a group before the main expression with including it in the result. In this case it matches the opening parantheses `(`. This feature may not be supported in your regex implementation, but in Ansible/Python it is supported. To make the regex even more specific you could add a *positive lookahead* (`(?=\))`) after the `\d+` to match the closing parantheses `)`.
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```yaml
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---
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- hosts: localhost
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vars:
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sample:
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result_list:
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- stdout_lines:
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- 'line0'
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- 'line12 (2319)'
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- stdout_lines:
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- 'line2'
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- 'line12 (2320)'
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tasks:
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- debug:
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msg: '{{ sample.result_list | json_query("[*].stdout_lines[1]") | map("regex_search" ,"(?<=\()\d+") | list }}'
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```
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