Is there a way to only run one task in ansible playbook?
For example, in roles/hadoop_primary/tasks/hadoop_master.yml
. I have "start hadoop job tracker services"
task. Can I just run that one task?
hadoop_master.yml file:
---
# Playbook for Hadoop master servers
- name: Install the namenode and jobtracker packages
apt: name={{item}} force=yes state=latest
with_items:
- hadoop-0.20-mapreduce-jobtracker
- hadoop-hdfs-namenode
- hadoop-doc
- hue-plugins
- name: start hadoop jobtracker services
service: name=hadoop-0.20-mapreduce-jobtracker state=started
tags:
debug
You should use tags:
as documented in http://docs.ansible.com/playbooks_tags.html
If you have a large playbook it may become useful to be able to run a specific part of the configuration without running the whole playbook.
Both plays and tasks support a “tags:” attribute for this reason.
Example:
tasks:
- yum: name={{ item }} state=installed
with_items:
- httpd
- memcached
tags:
- packages
- template: src=templates/src.j2 dest=/etc/foo.conf
tags:
- configuration
If you wanted to just run the “configuration” and “packages” part of a very long playbook, you could do this:
ansible-playbook example.yml --tags "configuration,packages"
On the other hand, if you want to run a playbook without certain tasks, you could do this:
ansible-playbook example.yml --skip-tags "notification"
You may also apply tags to roles:
roles:
- { role: webserver, port: 5000, tags: [ 'web', 'foo' ] }
And you may also tag basic include statements:
- include: foo.yml tags=web,foo
Both of these have the function of tagging every single task inside the include statement.