---
datafolder: engine-cli
datafile: docker_service_update
title: docker service update
---

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{% include cli.md %}

## Examples

### Update a service

```bash
$ docker service update --limit-cpu 2 redis
```

### Perform a rolling restart with no parameter changes

```bash
$ docker service update --force --update-parallelism 1 --update-delay 30s redis
```

In this example, the `--force` flag causes the service's tasks to be shut down
and replaced with new ones even though none of the other parameters would
normally cause that to happen. The `--update-parallelism 1` setting ensures
that only one task is replaced at a time (this is the default behavior). The
`--update-delay 30s` setting introduces a 30 second delay between tasks, so
that the rolling restart happens gradually.

### 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-else`volume, The last step unmounts the `/somewhere` mount
point, effectively removing the `test-data` volume. Each command returns the
service name.

- The `--mount-add` flag takes the same parameters as the `--mount` flag on
  `service create`. Refer to the [volumes and
  bind-mounts](service_create.md#volumes-and-bind-mounts-mount) section in the
  `service create` reference for details.

- The `--mount-rm` flag takes the `target` path of the mount.

```bash
$ 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
```

### Adding and removing secrets

Use the `--secret-add` or `--secret-rm` options add or remove a service's
secrets.

The following example adds a secret named `ssh-2` and removes `ssh-1`:

```bash
$ docker service update \
    --secret-add source=ssh-2,target=ssh-2 \
    --secret-rm ssh-1 \
    myservice
```

### Update services using templates

Some flags of `service update` support the use of templating.
See [`service create`](./service_create.md#templating) for the reference.