Have you seen the serial: argument to plays?
http://docs.ansible.com/ansible/latest/playbooks_delegation.html#rolling-update-batch-size
That's intended for working on a 'chunk' of N servers in a given group at once.
On 6 September 2017 at 13:00, Cev Ing <[email protected]> wrote:
> I have several clusters containing several nodes. I want to run
> configuration jobs on all cluster nodes. The configuration jobs involve a
> small down time of the cluster node. I have to take care, that at least a
> minimum number of nodes in each cluster is still running. What is the best
> practice to achieve this?
>
> I found an option in Ansible to limit the total number of simultaneous
> connections. But this does not help, because I need simultaneous connections
> per cluster.
>
> Another way is to put all nodes of each cluster in groups: First the group
> of all first cluster members, second the group of all second cluster members
> and so on. This would make it possible to apply the configuration role to
> each group. But this is still not exactly what I am looking for, because
> this serializes the cluster nodes more than necessary. If I have 10 nodes
> per cluster and I want to keep at least 50% of all nodes running, it would
> be possible for Ansible to process 5 nodes in parallel.
>
> What is the best practice for Ansible to handle cluster nodes?
>
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