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This adds support for two enhancements to swarm service rolling updates: - Failure thresholds: In Docker 1.12, a service update could be set up to either pause or continue after a single failure occurs. This adds an --update-max-failure-ratio flag that controls how many tasks need to fail to update for the update as a whole to be considered a failure. A counterpart flag, --update-monitor, controls how long to monitor each task for a failure after starting it during the update. - Rollback flag: service update --rollback reverts the service to its previous version. If a service update encounters task failures, or fails to function properly for some other reason, the user can roll back the update. SwarmKit also has the ability to roll back updates automatically after hitting the failure thresholds, but we've decided not to expose this in the Docker API/CLI for now, favoring a workflow where the decision to roll back is always made by an admin. Depending on user feedback, we may add a "rollback" option to --update-failure-action in the future. Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
5.1 KiB
5.1 KiB
| title | description | keywords | |
|---|---|---|---|
| service update | The service update command description and usage |
|
service update
Usage: docker service update [OPTIONS] SERVICE
Update a service
Options:
--args string Service command args
--constraint-add value Add or update placement constraints (default [])
--constraint-rm value Remove a constraint (default [])
--container-label-add value Add or update container labels (default [])
--container-label-rm value Remove a container label by its key (default [])
--endpoint-mode string Endpoint mode (vip or dnsrr)
--env-add value Add or update environment variables (default [])
--env-rm value Remove an environment variable (default [])
--group-add value Add additional user groups to the container (default [])
--group-rm value Remove previously added user groups from the container (default [])
--help Print usage
--image string Service image tag
--label-add value Add or update service labels (default [])
--label-rm value Remove a label by its key (default [])
--limit-cpu value Limit CPUs (default 0.000)
--limit-memory value Limit Memory (default 0 B)
--log-driver string Logging driver for service
--log-opt value Logging driver options (default [])
--mount-add value Add or update a mount on a service
--mount-rm value Remove a mount by its target path (default [])
--name string Service name
--publish-add value Add or update a published port (default [])
--publish-rm value Remove a published port by its target port (default [])
--replicas value Number of tasks (default none)
--reserve-cpu value Reserve CPUs (default 0.000)
--reserve-memory value Reserve Memory (default 0 B)
--restart-condition string Restart when condition is met (none, on-failure, or any)
--restart-delay value Delay between restart attempts (default none)
--restart-max-attempts value Maximum number of restarts before giving up (default none)
--restart-window value Window used to evaluate the restart policy (default none)
--rollback Rollback to previous specification
--stop-grace-period value Time to wait before force killing a container (default none)
--update-delay duration Delay between updates
--update-failure-action string Action on update failure (pause|continue) (default "pause")
--update-max-failure-ratio value Failure rate to tolerate during an update
--update-monitor duration Duration after each task update to monitor for failure (default 0s)
--update-parallelism uint Maximum number of tasks updated simultaneously (0 to update all at once) (default 1)
-u, --user string Username or UID (format: <name|uid>[:<group|gid>])
--with-registry-auth Send registry authentication details to Swarm agents
-w, --workdir string Working directory inside the container
Updates a service as described by the specified parameters. This command has to be run targeting a manager node.
The parameters are the same as docker service create. Please look at the description there
for further information.
Examples
Update a service
$ docker service update --limit-cpu 2 redis
Adding and removing mounts
Use the --mount-add or --mount-rm options add or remove a service's bind-mounts
or volumes.
The following example creates a service which mounts the test-data volume to
/somewhere. The next step updates the service to also mount the other-volume
volume to /somewhere-elsevolume, The last step unmounts the /somewhere mount
point, effectively removing the test-data volume. Each command returns the
service name.
-
The
--mount-addflag takes the same parameters as the--mountflag onservice create. Refer to the volumes and bind-mounts section in theservice createreference for details. -
The
--mount-rmflag takes thetargetpath of the mount.
$ docker service create \
--name=myservice \
--mount \
type=volume,source=test-data,target=/somewhere \
nginx:alpine \
myservice
myservice
$ docker service update \
--mount-add \
type=volume,source=other-volume,target=/somewhere-else \
myservice
myservice
$ docker service update --mount-rm /somewhere myservice
myservice