问题
I have playbooks which I start on a master host and which run specific actions on remote hosts. This is a "push" mode - the activity is initiated by the master host.
Several of my hosts are down at a given time and obviously fail to run the playbook when in such a state. This leads to hosts which are up-to-date, while others are not.
To fix this I could run the playbook on the master host in a regular way (via cron for instance) but this is not particularly effective.
Is there a built-in way in Ansible to reverse the flow, that is to initiate from a remote host a playbook available on the master, to run it on that remote host?
I can imagine that the remote host could ssh to the master (at boot time for instance) and then trigger the playbook with the host as a parameter (or something around that idea) but I would definitely prefer to use an Ansible feature instead of reinventing it.
回答1:
There is a script called ansible-pull which reverses the default push architecture of Ansible. There is also an example playbook from the Ansible developers available.
回答2:
The use of ansible-pull mode is really simple and straight-forward, this example might help you:
ansible-pull -d /root/playbooks -i 'localhost,' -U git@bitbucket.org:arbabnazar/pull-test.git --accept-host-key
options detail:
1. --accept-host-key: adds the hostkey for the repo url if not already added
2. -U: URL of the playbook repository
3. -d: directory to checkout repository to
4. –i localhost,: This option indicates the inventory that needs to be considered.
Since we're only concerned about one host, we use -i localhost,.
For detail, please refer to this tutorial
来源：https://stackoverflow.com/questions/38663591/is-it-possible-to-run-a-playbook-in-pull-mode