diff options
Diffstat (limited to 'ansible.html.markdown')
| -rw-r--r-- | ansible.html.markdown | 55 |
1 files changed, 53 insertions, 2 deletions
diff --git a/ansible.html.markdown b/ansible.html.markdown index 53ea153f..ae5ca01e 100644 --- a/ansible.html.markdown +++ b/ansible.html.markdown @@ -249,7 +249,9 @@ ansible -m shell -a 'echo "{{ my_variable }}"' -e 'my_variable="{{ lookup("pipe" ``` -### Register +### Register and Conditional + +#### Register Another way to dynamicaly generate the variable content is a `register` command `Register` is also useful to store an output of a task, and use it's value as a logic for execution further tasks. @@ -257,6 +259,56 @@ for execution further tasks. (venv) user@host:~/ansible-for-learnXinYminutes$ ansible-playbook playbooks/register_and_when.yml ``` +```yaml +#file content +--- +- hosts: localhost + tasks: + - name: check the system capacity + shell: df -h / + register: root_size + + - name: debug root_size + debug: + msg: "{{ root_size }}" + + - name: debug root_size return code + debug: + msg: "{{ root_size.rc }}" + + + - name: Print this message when return code of 'check the system capacity' was ok + debug: + msg: "{{ root_size.rc }}" + when: root_size.rc == 0 + +``` +#### Conditionals + +You can define complex logic with ansible and Jinja functions. Most common is usage of `when:`, with some variable (often dynamicly generated in previous playbook steps with `register` or `lookup`) + + + +### ansible - tags, limmit + +You should know about a way to increase efficiency by this simple functionality + +#### TAGS + You can tag a task, role (and its tasks), include, etc... + You can then limit an execution by using + --tags tagA, other_tag,... + + There are special tags: always + + --skip-tags can be used to exclude a block of code + +#### LIMMIT + You can limmit an execution of your tasks to defined hosts + --limit my_hostname + --limit groupname + --limit some_prefix* + --limit hostname:group #JM + ### Templates Template is a powerfull way to deliver some (partially) dynamic content. Ansible uses **Jinja2** langueage to describe the template. @@ -286,7 +338,6 @@ Junja is powerfull. It has built-in many usefull functions. # if variable is undefined - use default value {{ some_variable | default('default_value') }} ``` -### ansible - tags, limmit, diff, check_mode ### ansible-vault To maintain **ifrastructure as a code** you need to store secrets. |