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Sebastiaan van Stijn f03613aded Improve swarm join-token instructions

this change improves the instructions for
swarm join-token and swarm init;

- only print the join-token command for workers
  instead of for both managers and workers, to
  prevent users from copying the wrong command.
  An extra line is added to explain how to obtain
  the manager token.
- print a message that a token was rotated
  sucesfully if '--rotate' is used.
- add some extra white-space before / after
  the join commands, to make copy/pasting
  easier.

this change also does some refactoring of join-token;

- move flagname-constants together with other constants
- use variables for selected role ("worker" / "manager")
  to prevent checking for them multiple times, and to
  keep the "worker" / "manager" sting centralized
- add an extra blank line after "join-token" instructions
  this makes it easier to copy, and cleans up the
  code a tiny bit

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: ebebd4176940bc907ba4e8f5fbe62f6a050f8ed4
Component: engine

2016-08-02 16:44:02 +02:00

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Create a swarm

After you complete the tutorial setup steps, you're ready to create a swarm. Make sure the Docker Engine daemon is started on the host machines.

Open a terminal and ssh into the machine where you want to run your manager node. For example, the tutorial uses a machine named manager1.

Run the following command to create a new swarm:

docker swarm init --advertise-addr <MANAGER-IP>

In the tutorial, the following command creates a swarm on the manager1 machine:

$ docker swarm init --advertise-addr 192.168.99.100
Swarm initialized: current node (dxn1zf6l61qsb1josjja83ngz) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join \
    --token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c \
    192.168.99.100:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

The --advertise-addr flag configures the manager node to publish its address as 192.168.99.100. The other nodes in the swarm must be able to access the manager at the IP address.

The output incudes the commands to join new nodes to the swarm. Nodes will join as managers or workers depending on the value for the --swarm-token flag.

Run docker info to view the current state of the swarm:

$ docker info

Containers: 2
Running: 0
Paused: 0
Stopped: 2
  ...snip...
Swarm: active
  NodeID: dxn1zf6l61qsb1josjja83ngz
  Is Manager: true
  Managers: 1
  Nodes: 1
  ...snip...

Run the docker node ls command to view information about nodes:
```
$ docker node ls

ID                           HOSTNAME  STATUS  AVAILABILITY  MANAGER STATUS
dxn1zf6l61qsb1josjja83ngz *  manager1  Ready   Active        Leader
```
The * next to the node id indicates that you're currently connected on this node.

Docker Engine swarm mode automatically names the node for the machine host name. The tutorial covers other columns in later steps.

What's next?

In the next section of the tutorial, we'll add two more nodes to the cluster.

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Create a swarm

What's next?

2.5 KiB

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