How to build a three-node swarm cluster

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In this section we introduce how to build a three-node swarm cluster. When you install docker, swarm is already built in. So no additional installation is required.

Prepare the environment:

Three servers with docker installed.

Swarm manager: 192.168.0.109swarm worker1: 192.168.0.107swarm worker2: 192.168.0.110

Docker swarm init-- advertise-addr means that we need to declare an address if we want to initialize a swarm, because it is a cluster and must have multiple nodes. How to let other nodes know that we exist? Need advertise-addr our local address.

We are now running on swarm manager:

Vincent@192:~$ docker swarm init-advertise-addr=192.168.0.109Swarm initialized: current node (u6bj8diva2g7yn0y0x1h7lrff) is now a manager.To add a worker to this swarm, run the following command: docker swarm join--token SWMTKN-1-0csi5bbc0dazkq3yrqrzv09aatddo5iq9e3dal5anzvbsv46r5-1eu8dt8ku0vp3dm0xv7evsfw6 192.168.0.109:2377To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

Swarm manage initialization is complete, and if you need to add a worker, you need to use the following command on the worker node.

Docker swarm join-- token SWMTKN-1-0csi5bbc0dazkq3yrqrzv09aatddo5iq9e3dal5anzvbsv46r5-1eu8dt8ku0vp3dm0xv7evsfw6 192.168.0.109VR 2377

Use the command on the manage node:

Docker swarm join-token worker

You can view token

At the prompt, we run the command on swarm worker1:

Docker swarm join-token SWMTKN-1-0csi5bbc0dazkq3yrqrzv09aatddo5iq9e3dal5anzvbsv46r5-1eu8dt8ku0vp3dm0xv7evsfw6 192.168.0.109:2377This node joined a swarm as a worker.

The addition was successful.

View in swarm manager:

Docker node lsID HOSTNAME STATUS AVAILABILITY MANAGER STATUS1jh5hysrh3ii5kuhk5p0whcm6 192 Ready Activeu6bj8diva2g7yn0y0x1h7lrff * 192 Ready Active Leader

You can see that there are currently two nodes.

Run the command on swarm work2:

Docker swarm join-token SWMTKN-1-0csi5bbc0dazkq3yrqrzv09aatddo5iq9e3dal5anzvbsv46r5-1eu8dt8ku0vp3dm0xv7evsfw6 192.168.0.109:2377This node joined a swarm as a worker.

Check the cluster status at this time:

Vincent@192:~$ docker node lsID HOSTNAME STATUS AVAILABILITY MANAGER STATUS1jh5hysrh3ii5kuhk5p0whcm6 192 Ready Activeozotrf7bt5aa3taxu5479ak0y 192 Ready Activeu6bj8diva2g7yn0y0x1h7lrff * 192 Ready Active Leader

In this way, the cluster with three nodes is configured successfully.

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