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Further clarify what determines batch size in a play (#33833)

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Sam Doran 2017-12-13 11:38:30 -05:00 committed by Adam Miller
parent 29bed12cdd
commit bf29cc79a6
1 changed files with 3 additions and 3 deletions
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docs/docsite/rst/playbooks_delegation.rst
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@ -23,7 +23,7 @@ Rolling Update Batch Size
`````````````````````````
By default, Ansible will try to manage all of the machines referenced in a play in parallel. For a rolling update use case, you can define how many hosts Ansible should manage at a single time by using the ''serial'' keyword::
By default, Ansible will try to manage all of the machines referenced in a play in parallel. For a rolling update use case, you can define how many hosts Ansible should manage at a single time by using the ``serial`` keyword::
- name: test play
@ -33,7 +33,7 @@ By default, Ansible will try to manage all of the machines referenced in a play
In the above example, if we had 100 hosts, 3 hosts in the group 'webservers'
would complete the play completely before moving on to the next 3 hosts.
The ''serial'' keyword can also be specified as a percentage in Ansible 1.8 and later, which will be applied to the total number of hosts in a
The ``serial`` keyword can also be specified as a percentage, which will be applied to the total number of hosts in a
play, in order to determine the number of hosts per pass::
- name: test play
@ -80,7 +80,7 @@ You can also mix and match the values::
Maximum Failure Percentage
``````````````````````````
By default, Ansible will continue executing actions as long as there are hosts in the batch that have not yet failed. The batch size for a play is all the hosts specified in the ``hosts:`` field.
By default, Ansible will continue executing actions as long as there are hosts in the batch that have not yet failed. The batch size for a play is determined by the ``serial`` parameter. If ``serial`` is not set, then batch size is all the hosts specified in the ``hosts:`` field.
In some situations, such as with the rolling updates described above, it may be desirable to abort the play when a
certain threshold of failures have been reached. To achieve this, you can set a maximum failure
percentage on a play as follows::