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moby--moby/docs/reference/commandline/swarm_update.md
Aaron Lehmann 842d11f44c cli: Add options for Raft snapshotting 
Add the following options to "swarm init" and "swarm update":

- --max-snapshots: Retain this many old Raft snapshots in addition
  to the latest one

- --snapshot-interval: Number of log entries between Raft snapshots

These options already existed in SwarmKit and the Docker API but were
never exposed in the CLI. I'm adding them here to fix this oversight.

--max-snapshots may be useful for debugging purposes and more
conservative users who want to store rolling backups of old versions of
the Raft state.

--snapshot-interval is most useful for performance tuning. The default
value of 10000 may not be ideal for some setups.

There is also a LogEntriesForSlowFollowers option that is not exposed. I
decided not to expose it along with these others because I don't think
it's generally useful (and I'm not sure what I would call the CLI flag).
But if people want, I can expose it for the sake of completeness.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
2016-11-08 13:14:01 -08:00

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title description keywords
swarm update The swarm update command description and usage swarm, update

swarm update

Usage:  docker swarm update [OPTIONS]

Update the swarm

Options:
      --cert-expiry duration            Validity period for node certificates (default 2160h0m0s)
      --dispatcher-heartbeat duration   Dispatcher heartbeat period (default 5s)
      --external-ca value               Specifications of one or more certificate signing endpoints
      --help                            Print usage
      --max-snapshots int               Number of additional Raft snapshots to retain
      --snapshot-interval int           Number of log entries between Raft snapshots
      --task-history-limit int          Task history retention limit (default 5)

Updates a swarm with new parameter values. This command must target a manager node.

$ docker swarm update --cert-expiry 720h

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