Warning: this command is part of the Swarm management feature introduced in Docker 1.12, and might be subject to non backward-compatible changes.

service create

Usage:  docker service create [OPTIONS] IMAGE [COMMAND] [ARG...]

Create a new service

Options:
      --constraint value               Placement constraints (default [])
      --container-label value          Service container labels (default [])
      --endpoint-mode string           Endpoint mode (vip or dnsrr)
  -e, --env value                      Set environment variables (default [])
      --help                           Print usage
  -l, --label value                    Service labels (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 [])
      --mode string                    Service mode (replicated or global) (default "replicated")
      --mount value                    Attach a mount to the service
      --name string                    Service name
      --network value                  Network attachments (default [])
  -p, --publish value                  Publish a port as a node 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)
      --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-parallelism uint        Maximum number of tasks updated simultaneously (0 to update all at once) (default 1)
  -u, --user string                    Username or UID
      --with-registry-auth             Send registry authentication details to Swarm agents
  -w, --workdir string                 Working directory inside the container

Creates a service as described by the specified parameters. You must run this command on a manager node.

Примеры

Create a service

$ docker service create --name redis redis:3.0.6
dmu1ept4cxcfe8k8lhtux3ro3

$ docker service ls
ID            NAME   REPLICAS  IMAGE        COMMAND
dmu1ept4cxcf  redis  1/1       redis:3.0.6

Create a service with 5 replica tasks (--replicas)

Use the --replicas flag to set the number of replica tasks for a replicated service. The following command creates a redis service with 5 replica tasks:

$ docker service create --name redis --replicas=5 redis:3.0.6
4cdgfyky7ozwh3htjfw0d12qv

The above command sets the desired number of tasks for the service. Even though the command returns immediately, actual scaling of the service may take some time. The REPLICAS column shows both the actual and desired number of replica tasks for the service.

In the following example the desired state is 5 replicas, but the current number of RUNNING tasks is 3:

$ docker service ls
ID            NAME    REPLICAS  IMAGE        COMMAND
4cdgfyky7ozw  redis   3/5       redis:3.0.7

Once all the tasks are created and RUNNING, the actual number of tasks is equal to the desired number:

$ docker service ls
ID            NAME    REPLICAS  IMAGE        COMMAND
4cdgfyky7ozw  redis   5/5       redis:3.0.7

Create a service with a rolling update policy

$ docker service create \
  --replicas 10 \
  --name redis \
  --update-delay 10s \
  --update-parallelism 2 \
  redis:3.0.6

When you run a service update, the scheduler updates a maximum of 2 tasks at a time, with 10s between updates. For more information, refer to the rolling updates tutorial.

Set environment variables (-e, --env)

This sets environmental variables for all tasks in a service. For example:

$ docker service create --name redis_2 --replicas 5 --env MYVAR=foo redis:3.0.6

Set metadata on a service (-l, --label)

A label is a key=value pair that applies metadata to a service. To label a service with two labels:

$ docker service create \
  --name redis_2 \
  --label com.example.foo="bar"
  --label bar=baz \
  redis:3.0.6

For more information about labels, refer to apply custom metadata.

Set service mode (--mode)

You can set the service mode to “replicated” (default) or to “global”. A replicated service runs the number of replica tasks you specify. A global service runs on each active node in the swarm.

The following command creates a “global” service:

$ docker service create \
 --name redis_2 \
 --mode global \
 redis:3.0.6

Specify service constraints (--constraint)

You can limit the set of nodes where a task can be scheduled by defining 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

engine.labels apply to Docker Engine labels like operating system, drivers, etc. Swarm administrators add node.labels for operational purposes by using the docker node update command.

For example, the following limits tasks for the redis service to nodes where the node type label equals queue:

$ docker service create \
  --name redis_2 \
  --constraint 'node.labels.type == queue' \
  redis:3.0.6

Attach a service to an existing network (--network)

You can use overlay networks to connect one or more services within the swarm.

First, create an overlay network on a manager node the docker network create command:

$ docker network create --driver overlay my-network

etjpu59cykrptrgw0z0hk5snf

After you create an overlay network in swarm mode, all manager nodes have access to the network.

When you create a service and pass the --network flag to attach the service to the overlay network:

$ docker service create
--replicas 3
--network my-network
--name my-web
nginx

716thylsndqma81j6kkkb5aus The swarm extends my-network to each node running the service.

Containers on the same network can access each other using service discovery.

Publish service ports externally to the swarm (-p, --publish)

You can publish service ports to make them available externally to the swarm using the --publish flag:

docker service create --publish <TARGET-PORT>:<SERVICE-PORT> nginx

Пример:

docker service create --name my_web --replicas 3 --publish 8080:80 nginx

When you publish a service port, the swarm routing mesh makes the service accessible at the target port on every node regardless if there is a task for the service running on the node. For more information refer to Use swarm mode routing mesh.


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