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Add --mount syntax documentation to CLI reference

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Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Sebastiaan van Stijn 2016-08-15 23:51:15 +02:00
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2
docs/reference/commandline/run.md
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@ -240,6 +240,8 @@ binary (refer to [get the linux binary](
you give the container the full access to create and manipulate the host's
Docker daemon.
For in-depth information about volumes, refer to [manage data in containers](../../tutorials/dockervolumes.md)
### Publish or expose port (-p, --expose)
$ docker run -p 127.0.0.1:80:8080 ubuntu bash

125
docs/reference/commandline/service_create.md
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@ -137,6 +137,114 @@ $ docker service create \
For more information about labels, refer to [apply custom
metadata](../../userguide/labels-custom-metadata.md).
### Add volumes or bind-mounts
The following table describes the options for defining mounts in a service:
| Option | Required | Description
|:----------------------|:------------------|:--------------------------------------------------------------------------------------------------------------------
| **type** | | The type of mount, can be either "volume", or "bind". Defaults to "volume" if no type is specified.<ul><li>`volume`: (default) mounts a [managed volume](volume_create.md) into the container.</li><li>`bind`: bind-mounts a directory or file from the host into the container.</li></ul>
| **src** | `bind`&nbsp;only | <ul><li>`type=volume`: Use `src` to specify the name of the volume (e.g., `src=my-volume`). If a volume with the given name does not exist, it is automatically created. If this option is omitted, an ephemeral volume with a random name is generated. Random names are guaranteed to be unique on the host, but may not be unique cluster-wide. Ephemeral volumes have the same lifecycle as the container it is attached to, and are destroyed when the *container* is destroyed (which is upon `service update`, or when scaling or re-balancing the service).</li><li>`type=bind`: Use `src` to specify host-path to bind mount (e.g., `src=/path/on/host/`). When using a bind-mount (`"type=bind"`), the `src` path must be specified as an absolute path, and *must* be a pre-existing path, or an error is produced.</li></ul>
| **source** | | Alias for `src`.
| **dst** | yes | Mount path inside the container, for example `/some/path/in/container/`. If the path does not exist in the container's filesystem, the Engine creates a directory at the specified location before mounting the volume or bind-mount.
| **destination** | | Alias for `dst`.
| **target** | | Alias for `dst`.
| **readonly** | | By default, the Engine mounts binds and volumes `read-write`. Pass the `readonly` option to mount the bind or volume `read-only` in the container.<br /><br />A value is optional:<ul><li>`true` or `1`: Default if you do not provide a value. Mounts the bind or volume read-only in the container.</li><li>`false` or `0`: Mounts the bind or volume read-write in the container.</li></ul>
| **ro** | | Alias for `readonly`.
The following options can only be used for bind-mounts (`type=bind`);
| Option | Description
|:----------------------|:--------------------------------------------------------------------------------------------------------------------
| **bind-propagation** | Bind propagation options to set on the mount at runtime. Valid options are `shared`, `slave`, `private`, `rshared`, `rslave`, and `rprivate`. Defaults to `rprivate` if not specified. For volumes, bind propagation is not configurable, and also defaults to `rprivate`.
The following options can only be used for named volumes (`type=volume`);
| Option | Description
|:----------------------|:--------------------------------------------------------------------------------------------------------------------
| **volume-driver** | Name of the volume-driver plugin to use for the volume. Defaults to the ``"local"`` volume driver to create the volume if it does not exist.
| **volume-label** | Custom metadata ("labels") to apply to the volume upon creation. Labels are provided as comma-separated list of key/value pairs, for example, `volume-label=hello=world`. For more information about labels, refer to [apply custom metadata](../../userguide/labels-custom-metadata.md).
| **volume-nocopy** | By default, if you attach an empty volume to a container, the Engine propagates the files and directories that are present at the mount-path (`dst`) inside the container into the volume. Set `volume-nocopy` to disables copying files from the container's filesystem to the volume and mount the empty volume.<br /><br />A value is optional:<ul><li>`true` or `1`: Default if you do not provide a value. Disables copying.</li><li>`false` or `0`: Enables copying.</li></ul>
| **volume-opt** | Volume driver-specific options to use when creating the volume. Options are provided as comma-separated list of key/value pairs, for example, `volume-opt=some-option=some-value,some-other-option=some-other-value`. For available options, refer to the documentation of the volume driver that is used.
#### Differences between "--mount" and "--volume"
The `--mount` flag features most options that are supported by the `-v` /
`--volume` flag for `docker run`. There are some differences;
- The `--mount` flag allows specifying a volume driver, and volume driver
options *per volume*, without having to create volumes in advance. When using
`docker run`, only a single volume driver can be specified (using the
`--volume-driver` flag), which is shared by all volumes.
- The `--mount` flag allows specifying custom metadata ("labels") for the volume,
without having to create the volume out of band.
- When using `type=bind`, the host-path must refer to an *existing* path on the
host, and is not automatically created if the path does not exist. If the
specified path does not exist on the host, an error is produced, and the
service will fail to be deployed succesfully.
- The `--mount` flag does not allow you to relabel volumes with `Z` or `z`
#### Create a service using a named volume
The following example creates a service that uses a named volume:
```bash
$ docker service create \
--name my-service \
--replicas 3 \
--mount type=volume,source=my-volume,destination=/path/in/container,volume-label="color=red",volume-label="shape=round" \
nginx:alpine
```
For each replica of the service, the engine requests a volume named "my-volume"
from the default ("local") volume driver where the task is deployed. If the
volume does not exist, the engine creates a new volume and applies the "color"
and "shape" labels.
When the task is started, the volume is mounted on `/path/in/container/` inside
the container.
Be aware that the default ("local") volume is a locally scoped volume driver.
This means that depending on where a task is deployed, either that task gets a
*new* volume named "my-volume", or shares the same "my-volume" with other tasks
of the same service. Multiple containers writing to a single shared volume can
cause data corruption if the software running inside the container is not
designed to handle concurrent processes writing to the same location. Also take
into account that containers can be re-scheduled by the Swarm orchestrator and
be deployed on a different node.
#### Create a service that uses an anonymous (ephemeral) volume
The following command creates a service with three replicas with an anonymous
volume on `/path/in/container`:
```bash
$ docker service create \
--name my-service \
--replicas 3 \
--mount type=volume,destination=/path/in/container \
nginx:alpine
```
In this example, no name (`source`) is specified for the volume, hence a new,
*randomly named* volume is created for each task. This guarantees that each task
gets its own volume, and volumes are not shared between tasks. Unnamed volumes
are considered "ephemeral", and are destroyed when the container is destroyed.
#### Create a service that uses a bind-mounted host directory
The following example bind-mounts a host directory at `/path/in/container` in
the containers backing the service:
```bash
$ docker service create \
--name my-service \
--mount type=bind,source=/path/on/host,destination=/path/in/container \
nginx:alpine
```
### Set service mode (--mode)
You can set the service mode to "replicated" (default) or to "global". A
@ -159,13 +267,13 @@ constraint expressions. Multiple constraints find nodes that satisfy every
expression (AND match). Constraints can match node or Docker Engine labels as
follows:
| node attribute | matches | example |
|:------------- |:-------------| :---------------------------------------------|
| node.id | node ID | `node.id == 2ivku8v2gvtg4` |
| node.hostname | node hostname | `node.hostname != node-2` |
| node.role | node role: manager | `node.role == manager` |
| node.labels | user defined node labels | `node.labels.security == high` |
| engine.labels | Docker Engine's labels | `engine.labels.operatingsystem == ubuntu 14.04`|
| node attribute | matches | example |
|:----------------|:--------------------------|:------------------------------------------------|
| node.id | node ID | `node.id == 2ivku8v2gvtg4` |
| node.hostname | node hostname | `node.hostname != node-2` |
| node.role | node role: manager | `node.role == manager` |
| node.labels | user defined node labels | `node.labels.security == high` |
| engine.labels | Docker Engine's labels | `engine.labels.operatingsystem == ubuntu 14.04` |
`engine.labels` apply to Docker Engine labels like operating system,
drivers, etc. Swarm administrators add `node.labels` for operational purposes by
@ -240,3 +348,6 @@ the service running on the node. For more information refer to
* [service scale](service_scale.md)
* [service ps](service_ps.md)
* [service update](service_update.md)
<style>table tr > td:first-child { white-space: nowrap;}</style>

29
docs/reference/commandline/service_update.md
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@ -67,6 +67,35 @@ for further information.
$ docker service update --limit-cpu 2 redis
```
### Adding and removing mounts
You can add, or remove bind-mounts or volumes to a service using the
`--mount-add` and `--mount-rm` options.
The following example creates a service using the `test-data` volume, then
updates the service to mount another volume, and finally unmounts the first
volume:
```bash
$ docker service create --name=myservice --mount type=volume,source=test-data,target=/somewhere nginx:alpine
myservice
$ docker service update --mount-add type=volume,source=other-volume,target=/somewhere-else myservice
myservice
$ docker service update --mount-rm /somewhere myservice
myservice
```
The `--mount-rm` flag takes the `target` path of the mount. 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.
## Related information
* [service create](service_create.md)