As outlined in the spec, fast-forward upgrades aim to take an
environment from an initial release of N to a release of N>=2, beyond
that of the traditionally supported N+1 upgrade path provided today by
many OpenStack projects.
For TripleO the first phase of this upgrade will be to move the
environment to the release prior to the target release. This will be
achieved by disabling all OpenStack control plane services and then
preforming the minimum number of steps required to upgrade each service
through each release until finally reaching the target release.
This change introduces the framework for this phase of the fast-forward
upgrades by adding playbooks and task files as outputs to RoleConfig.
- fast_forward_upgrade_playbook.yaml
This is the top level play and acts as the outer loop of the process,
iterating through the required releases as set by the
FastForwardUpgradeReleases parameter for the fast-forward section of the
upgrade. This currently defaults to Ocata and Pike for Queens.
Note that this play is run against the overcloud host group and it is
currently assumed that the inventory used to run this play is provided
by the tripleo-ansible-inventory command.
- fast_forward_upgrade_release_tasks.yaml
This output simply imports the top level prep and bootstrap task files.
- fast_forward_upgrade_prep_tasks.yaml
- fast_forward_upgrade_bootstrap_tasks.yaml
These outputs act as the inner loop for the fast-forward upgrade phase,
iterating over step values while importing their associated role tasks.
As prep tasks are carried out first for each release we loop over step
values starting at 0 and ending at the defined
fast_forward_upgrade_prep_steps_max, currently 3.
Following this we then complete the bootstrap tasks for each release,
looping over steps values starting at
fast_forward_upgrade_prep_steps_max + 1 , currently 4 and ending at
fast_forward_upgrade_steps_max,currently 9.
- fast_forward_upgrade_prep_role_tasks.yaml
- fast_forward_upgrade_bootstrap_role_tasks.yaml
These outputs then finally import the fast_forward_upgrade_tasks files
generated by the FastForwardUpgradeTasks YAQL query for each role. For
prep tasks these are always included when on an Ansible host of a given
role. This differs from bootstrap tasks that are only included for the
first host associated with a given role.
This will result in the following order of task imports with their
associated value of release and step:
fast_forward_upgrade_playbook
\_fast_forward_upgrade_release_tasks
\_fast_forward_upgrade_prep_tasks - release=ocata
\_fast_forward_upgrade_prep_role_tasks - release=ocata
\_$roleA/fast_forward_upgrade_tasks - release=ocata, step=0
\_$roleB/fast_forward_upgrade_tasks - release=ocata, step=0
\_$roleA/fast_forward_upgrade_tasks - release=ocata, step=1
\_$roleB/fast_forward_upgrade_tasks - release=ocata, step=1
\_$roleA/fast_forward_upgrade_tasks - release=ocata, step=2
\_$roleB/fast_forward_upgrade_tasks - release=ocata, step=2
\_$roleA/fast_forward_upgrade_tasks - release=ocata, step=3
\_$roleB/fast_forward_upgrade_tasks - release=ocata, step=3
\_fast_forward_upgrade_bootstrap_tasks - release=ocata
\_fast_forward_upgrade_bootstrap_role_tasks - release=ocata
\_$roleA/fast_forward_upgrade_tasks - release=ocata, step=4
\_$roleB/fast_forward_upgrade_tasks - release=ocata, step=4
\_$roleA/fast_forward_upgrade_tasks - release=ocata, step=5
\_$roleB/fast_forward_upgrade_tasks - release=ocata, step=5
\_$roleA/fast_forward_upgrade_tasks - release=ocata, step=N
\_$roleB/fast_forward_upgrade_tasks - release=ocata, step=N
\_fast_forward_upgrade_release_tasks
\_fast_forward_upgrade_prep_tasks - release=pike
\_fast_forward_upgrade_prep_role_tasks - release=pike
\_$roleA/fast_forward_upgrade_tasks - release=pike, step=0
\_$roleB/fast_forward_upgrade_tasks - release=pike, step=0
\_$roleA/fast_forward_upgrade_tasks - release=pike, step=1
\_$roleB/fast_forward_upgrade_tasks - release=pike, step=1
\_$roleA/fast_forward_upgrade_tasks - release=pike, step=2
\_$roleB/fast_forward_upgrade_tasks - release=pike, step=2
\_$roleA/fast_forward_upgrade_tasks - release=pike, step=3
\_$roleB/fast_forward_upgrade_tasks - release=pike, step=3
\_fast_forward_upgrade_bootstrap_tasks - release=pike
\_fast_forward_upgrade_bootstrap_role_tasks - release=pike
\_$roleA/fast_forward_upgrade_tasks - release=pike, step=4
\_$roleB/fast_forward_upgrade_tasks - release=pike, step=4
\_$roleA/fast_forward_upgrade_tasks - release=pike, step=5
\_$roleB/fast_forward_upgrade_tasks - release=pike, step=5
\_$roleA/fast_forward_upgrade_tasks - release=pike, step=N
\_$roleB/fast_forward_upgrade_tasks - release=pike, step=N
bp fast-forward-upgrades
Change-Id: Ie2683fd7b81167abe724a7b9245bf85a0a87ad1d
acb2475e4c