Docsite: fix user_guide/playbooks_handlers (#71770)
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1 changed files with 44 additions and 33 deletions
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@ -14,49 +14,54 @@ Handler example
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This playbook, ``verify-apache.yml``, contains a single play with a handler::
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This playbook, ``verify-apache.yml``, contains a single play with a handler::
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---
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---
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- name: verify apache installation
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- name: Verify apache installation
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hosts: webservers
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hosts: webservers
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vars:
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vars:
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http_port: 80
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http_port: 80
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max_clients: 200
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max_clients: 200
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remote_user: root
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remote_user: root
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tasks:
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tasks:
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- name: ensure apache is at the latest version
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- name: Ensure apache is at the latest version
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yum:
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ansible.builtin.yum:
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name: httpd
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name: httpd
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state: latest
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state: latest
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- name: write the apache config file
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template:
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- name: Write the apache config file
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ansible.builtin.template:
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src: /srv/httpd.j2
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src: /srv/httpd.j2
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dest: /etc/httpd.conf
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dest: /etc/httpd.conf
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notify:
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notify:
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- restart apache
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- Restart apache
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- name: ensure apache is running
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service:
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- name: Ensure apache is running
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ansible.builtin.service:
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name: httpd
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name: httpd
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state: started
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state: started
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handlers:
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handlers:
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- name: restart apache
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- name: Restart apache
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service:
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ansible.builtin.service:
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name: httpd
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name: httpd
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state: restarted
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state: restarted
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In this example playbook, the second task notifies the handler. A single task can notify more than one handler::
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In this example playbook, the second task notifies the handler. A single task can notify more than one handler::
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- name: template configuration file
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- name: Template configuration file
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template:
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ansible.builtin.template:
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src: template.j2
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src: template.j2
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dest: /etc/foo.conf
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dest: /etc/foo.conf
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notify:
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notify:
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- restart memcached
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- Restart memcached
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- restart apache
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- Restart apache
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handlers:
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handlers:
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- name: restart memcached
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- name: Restart memcached
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service:
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ansible.builtin.service:
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name: memcached
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name: memcached
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state: restarted
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state: restarted
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- name: restart apache
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service:
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- name: Restart apache
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ansible.builtin.service:
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name: apache
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name: apache
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state: restarted
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state: restarted
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@ -68,9 +73,14 @@ By default, handlers run after all the tasks in a particular play have been comp
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If you need handlers to run before the end of the play, add a task to flush them using the :ref:`meta module <meta_module>`, which executes Ansible actions::
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If you need handlers to run before the end of the play, add a task to flush them using the :ref:`meta module <meta_module>`, which executes Ansible actions::
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tasks:
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tasks:
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- shell: some tasks go here
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- name: Some tasks go here
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- meta: flush_handlers
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ansible.builtin.shell: ...
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- shell: some other tasks
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- name: Flush handlers
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meta: flush_handlers
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- name: Some other tasks
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ansible.builtin.shell: ...
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The ``meta: flush_handlers`` task triggers any handlers that have been notified at that point in the play.
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The ``meta: flush_handlers`` task triggers any handlers that have been notified at that point in the play.
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@ -80,8 +90,8 @@ Using variables with handlers
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You may want your Ansible handlers to use variables. For example, if the name of a service varies slightly by distribution, you want your output to show the exact name of the restarted service for each target machine. Avoid placing variables in the name of the handler. Since handler names are templated early on, Ansible may not have a value available for a handler name like this::
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You may want your Ansible handlers to use variables. For example, if the name of a service varies slightly by distribution, you want your output to show the exact name of the restarted service for each target machine. Avoid placing variables in the name of the handler. Since handler names are templated early on, Ansible may not have a value available for a handler name like this::
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handlers:
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handlers:
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# this handler name may cause your play to fail!
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# This handler name may cause your play to fail!
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- name: restart "{{ web_service_name }}"
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- name: Restart "{{ web_service_name }}"
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If the variable used in the handler name is not available, the entire play fails. Changing that variable mid-play **will not** result in newly created handler.
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If the variable used in the handler name is not available, the entire play fails. Changing that variable mid-play **will not** result in newly created handler.
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@ -94,28 +104,29 @@ Instead, place variables in the task parameters of your handler. You can load th
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include_vars: "{{ ansible_facts.distribution }}.yml"
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include_vars: "{{ ansible_facts.distribution }}.yml"
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handlers:
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handlers:
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- name: restart web service
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- name: Restart web service
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service:
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ansible.builtin.service:
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name: "{{ web_service_name | default('httpd') }}"
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name: "{{ web_service_name | default('httpd') }}"
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state: restarted
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state: restarted
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Handlers can also "listen" to generic topics, and tasks can notify those topics as follows::
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Handlers can also "listen" to generic topics, and tasks can notify those topics as follows::
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handlers:
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handlers:
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- name: restart memcached
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- name: Restart memcached
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service:
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ansible.builtin.service:
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name: memcached
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name: memcached
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state: restarted
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state: restarted
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listen: "restart web services"
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listen: "restart web services"
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- name: restart apache
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service:
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- name: Restart apache
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ansible.builtin.service:
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name: apache
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name: apache
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state: restarted
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state: restarted
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listen: "restart web services"
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listen: "restart web services"
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tasks:
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tasks:
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- name: restart everything
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- name: Restart everything
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command: echo "this task will restart the web services"
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ansible.builtin.command: echo "this task will restart the web services"
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notify: "restart web services"
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notify: "restart web services"
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This use makes it much easier to trigger multiple handlers. It also decouples handlers from their names,
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This use makes it much easier to trigger multiple handlers. It also decouples handlers from their names,
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@ -132,6 +143,6 @@ a shared source like Galaxy).
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When using handlers within roles, note that:
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When using handlers within roles, note that:
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* handlers notified within ``pre_tasks``, ``tasks``, and ``post_tasks`` sections are automatically flushed in the end of section where they were notified.
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* handlers notified within ``pre_tasks``, ``tasks``, and ``post_tasks`` sections are automatically flushed at the end of section where they were notified.
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* handlers notified within ``roles`` section are automatically flushed in the end of ``tasks`` section, but before any ``tasks`` handlers.
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* handlers notified within ``roles`` section are automatically flushed at the end of ``tasks`` section, but before any ``tasks`` handlers.
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* handlers are play scoped and as such can be used outside of the role they are defined in.
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* handlers are play scoped and as such can be used outside of the role they are defined in.
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