In 2.0 we added a new way to control play execution, strategy, by default plays will
still run as they used to, with what we call the linear strategy. All hosts will run each
task before any host starts the next task, using the number of forks (default 5) to parallelize.
The serial directive can ‘batch’ this behaviour to a subset of the hosts, which then run to
completion of the play before the next ‘batch’ starts.
A second strategy ships with ansible free, which allows each host to run until the end of
the play as fast as it can.:
- hosts: all
strategy: free
tasks:
...
The strategies are implemented via a new type of plugin, this means that in the future new execution types can be added, either locally by users or to Ansible itself by a code contribution.
One example is debug strategy. See Playbook Debugger for details.
参见