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Explain ports 2376 and 2377 (#4677)

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Gwendolynne Barr 2017-09-19 17:39:40 -07:00 committed by GitHub
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get-started/part4.md
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@ -67,35 +67,41 @@ machine a swarm manager. From then on, Docker will run the commands you execute
on the swarm you're managing, rather than just on the current machine. on the swarm you're managing, rather than just on the current machine.
{% capture local-instructions %} {% capture local-instructions %}
You now have two VMs created, named `myvm1` and `myvm2` (as `docker-machine ls` You now have two VMs created, named `myvm1` and `myvm2`:
shows). The first one will act as the manager, which executes `docker` commands
and authenticates workers to join the swarm, and the second will be a worker. ```shell
docker-machine ls
```
The first one will act as the manager, which executes management commands and
authenticates workers to join the swarm, and the second will be a worker.
You can send commands to your VMs using `docker-machine ssh`. Instruct `myvm1` You can send commands to your VMs using `docker-machine ssh`. Instruct `myvm1`
to become a swarm manager with `docker swarm init` and you'll see output like to become a swarm manager with `docker swarm init` and you'll see output like
this: this:
```shell ```shell
$ docker-machine ssh myvm1 "docker swarm init" $ docker-machine ssh myvm1 "docker swarm init --advertise-addr <myvm1 ip>"
Swarm initialized: current node <node ID> is now a manager. Swarm initialized: current node <node ID> is now a manager.
To add a worker to this swarm, run the following command: To add a worker to this swarm, run the following command:
docker swarm join \ docker swarm join \
--token <token> \ --token <token> \
<ip>:<port> <myvm ip>:<port>
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
``` ```
> Got an error about needing to use `--advertise-addr`? > **Note**: Ports 2376 and 2377
> > Port 2376 is the Docker daemon port. Port 2377 is the swarm management port.
> Copy the > Run `docker swarm init` and `docker swarm join` with port 2377 or no port at
> IP address for `myvm1` by running `docker-machine ls`, then run the > all.
> `docker swarm init` command again, using that IP and specifying port `2377`
> (the port for swarm joins) with `--advertise-addr`. For example: > The VM URLs returned by`docker-machine ls` include port 2376. Do not use this
> > port or [you may experience errors](https://forums.docker.com/t/docker-swarm-join-with-virtualbox-connection-error-13-bad-certificate/31392/2).
> ```
> docker-machine ssh myvm1 "docker swarm init --advertise-addr 192.168.99.100:2377" > To start over, run `docker swarm leave` from each node.
> ```
As you can see, the response to `docker swarm init` contains a pre-configured As you can see, the response to `docker swarm init` contains a pre-configured
`docker swarm join` command for you to run on any nodes you want to add. Copy `docker swarm join` command for you to run on any nodes you want to add. Copy
@ -105,14 +111,14 @@ join your new swarm as a worker:
```shell ```shell
$ docker-machine ssh myvm2 "docker swarm join \ $ docker-machine ssh myvm2 "docker swarm join \
--token <token> \ --token <token> \
<ip>:<port>" <ip>:2377"
This node joined a swarm as a worker. This node joined a swarm as a worker.
``` ```
Congratulations, you have created your first swarm. Congratulations, you have created your first swarm.
> **Note**: You can also run `docker-machine ssh myvm2` with no command attached > **Note**: You can also run `docker-machine ssh myvm1` with no command attached
to open a terminal session on that VM. Type `exit` when you're ready to return to open a terminal session on that VM. Type `exit` when you're ready to return
to the host shell prompt. It may be easier to paste the join command in that to the host shell prompt. It may be easier to paste the join command in that
way. way.