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docker service rollback: fix non-zero exit code in some cases 

Before this change:
--------------------------------------------

    $ docker service create --replicas=1 --name foo -p 8080:80 nginx:alpine
    t33qvykv8y0zbz266rxynsbo3
    overall progress: 1 out of 1 tasks
    1/1: running   [==================================================>]
    verify: Service converged

    $ echo $?
    0

    $ docker service update --replicas=5 foo
    foo
    overall progress: 5 out of 5 tasks
    1/5: running   [==================================================>]
    2/5: running   [==================================================>]
    3/5: running   [==================================================>]
    4/5: running   [==================================================>]
    5/5: running   [==================================================>]
    verify: Service converged

    $ echo $?
    0

    $ docker service rollback foo
    foo
    rollback: manually requested rollback
    overall progress: rolling back update: 1 out of 1 tasks
    1/1: running   [>                                                  ]
    verify: Service converged

    $ echo $?
    0

    $ docker service rollback foo
    foo
    service rolled back: rollback completed

    $ echo $?
    1

After this change:
--------------------------------------------

    $ docker service create --replicas=1 --name foo -p 8080:80 nginx:alpine
    t33qvykv8y0zbz266rxynsbo3
    overall progress: 1 out of 1 tasks
    1/1: running   [==================================================>]
    verify: Service converged

    $ echo $?
    0

    $ docker service update --replicas=5 foo
    foo
    overall progress: 5 out of 5 tasks
    1/5: running   [==================================================>]
    2/5: running   [==================================================>]
    3/5: running   [==================================================>]
    4/5: running   [==================================================>]
    5/5: running   [==================================================>]
    verify: Waiting 1 seconds to verify that tasks are stable...

    $ echo $?
    0

    $ docker service rollback foo
    foo
    rollback: manually requested rollback
    overall progress: rolling back update: 1 out of 1 tasks
    1/1: running   [>                                                  ]
    verify: Service converged

    $ echo $?
    0

    $ docker service rollback foo
    foo
    service rolled back: rollback completed

    $ echo $?
    0

    $ docker service ps foo
    ID             NAME      IMAGE          NODE             DESIRED STATE   CURRENT STATE           ERROR     PORTS
    4dt4ms4c5qfb   foo.1     nginx:alpine   docker-desktop   Running         Running 2 minutes ago

Remaining issues with reconciliation
--------------------------------------------

Note that both before, and after this change, the command sometimes terminates
early, and does not wait for the service to reconcile; this is most apparent
when rolling back is scaling up (so more tasks are deployed);

    $ docker service rollback foo
    foo
    service rolled back: rollback completed

    $ docker service rollback foo
    foo
    rollback: manually requested rollback
    overall progress: rolling back update: 1 out of 5 tasks
    1/5: pending   [=================================>                 ]
    2/5: running   [>                                                  ]
    3/5: pending   [=================================>                 ]
    4/5: pending   [=================================>                 ]
    5/5: pending   [=================================>                 ]
    service rolled back: rollback completed

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2021-01-19 14:25:08 +01:00
parent 1e54c5d67c
commit ce26a165b0
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GPG Key ID: 76698F39D527CE8C
1 changed files with 2 additions and 1 deletions
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3
cli/command/service/progress/progress.go
View File

@ -140,7 +140,8 @@ func ServiceProgress(ctx context.Context, client client.APIClient, serviceID str
return fmt.Errorf("service rollback paused: %s", service.UpdateStatus.Message) return fmt.Errorf("service rollback paused: %s", service.UpdateStatus.Message)
case swarm.UpdateStateRollbackCompleted: case swarm.UpdateStateRollbackCompleted:
if !converged { if !converged {
return fmt.Errorf("service rolled back: %s", service.UpdateStatus.Message) progress.Messagef(progressOut, "", "service rolled back: %s", service.UpdateStatus.Message)
return nil
} }
} }
} }