- \n
- Minimum two nodes with Docker installed ( swarm manager and cluster nodes)<\/li>\n
- All the nodes should be able to talk to each other using public or private IP addresses.<\/li>\n<\/ul>\n
In this setup, I have total 4 nodes. 1 Swarm manager node and three other nodes to join the cluster with the following private IP addresses<\/p>\n
Manager - 10.140.0.2\nNode1 - 10.140.0.6\nNode2 - 10.140.0.4\nMode3 - 10.140.0.5<\/code><\/pre>\nFollow the steps given below for a multi node swarm cluster.<\/p>\n
On Manager Node<\/h3>\n
1. Execute the following command with the manager nodes IP for initializing the swarm cluster. <\/p>\n
docker swarm init --advertise-addr <MANAGER-IP><\/code><\/pre>\nFor example, <\/p>\n
docker swarm init --advertise-addr 10.140.0.2\n<\/code><\/pre>\nYou will get the following output once swarm is initialized.<\/p>\n
[devopscube@manager ~]$ docker swarm init --advertise-addr 10.140.0.2\nSwarm initialized: current node (0qjtv7kblhbrbub4yyk1tq1e7) is now a manager.\n\nTo add a worker to this swarm, run the following command:\n\n docker swarm join \\\n --token SWMTKN-1-3l50pb6ko5ci23134wzt17gqkb4nsbv4e52ciwdwq80hmmx1si-d3kv6s6qtgf0crqmz9dxix2oc \\\n 10.140.0.2:2377\n\nTo add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.\n\n[devopscube@manager ~]$<\/code><\/pre>\nAs you can see, the output has the steps to join other nodes to this swarm manager node.<\/p>\n
<\/p>\n
- \n
- To know the swarm cluster info, execute the following command.<\/li>\n<\/ol>\n
<\/p>\n
docker info<\/code><\/pre>\nIn the output, you will see the following.<\/p>\n
Swarm: active\n NodeID: 0qjtv7kblhbrbub4yyk1tq1e7\n Is Manager: true\n ClusterID: zj0ioxrvl0tsyxasbhwyu947l\n Managers: 1\n Nodes: 1<\/code><\/pre>\n<\/p>\n
- \n
- To know the information about all the nodes in the cluster, you can run the following command.<\/li>\n<\/ol>\n
<\/p>\n
docker node ls<\/code><\/pre>\nOn Node 1, 2 and 3<\/h3>\n
Now that we have the swarm manager ready, we can add our other nodes to the manager to form a multi node cluster.<\/p>\n
- \n
- Execute the swarm join command from the manager output on all the extra nodes as shown below. The swarm token and IP will change based on your environment.<\/li>\n<\/ol>\n
Note:<\/strong> You can get the swarm token with the command by executing
docker swarm join-token worker<\/code> on the manager node.<\/p><\/blockquote>\nsudo docker swarm join \\ \n--token SWMTKN-1-3l50pb6ko5ci23134wzt17gqkb4nsbv4e52ciwdwq80hmmx1si-d3kv6s6qtgf0crqmz9dxix2oc \\\n10.140.0.2:2377\n<\/code><\/pre>\nSwarm Configuration and Testing<\/h3>\n
1. Once you joined all the extra nodes, you can list the swarm node information by executing the following command on the manager node.<\/p>\n
sudo docker node ls<\/code><\/pre>\nYou will get the output will the swarm cluster info as shown below.<\/p>\n
[devopscube@manager ~]$ sudo docker node ls\nID HOSTNAME STATUS AVAILABILITY MANAGER STATUS\n0qjtv7kblhbrbub4yyk1tq1e7 * manager Ready Active Leader\nadig05zbyuxt4x0oltrbrc523 node2 Ready Active \nbzupprwwasy6vvwh4hn0s4txz node1 Ready Active \nug20slq1qyk6uzwgfv3a5zd86 node3 Ready Active<\/code><\/pre>\nNow our cluster is ready. You can start deploying applications to your swarm cluster.<\/p>\n
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<\/figure>\n
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- Execute the swarm join command from the manager output on all the extra nodes as shown below. The swarm token and IP will change based on your environment.<\/li>\n<\/ol>\n
- To know the information about all the nodes in the cluster, you can run the following command.<\/li>\n<\/ol>\n
- To know the swarm cluster info, execute the following command.<\/li>\n<\/ol>\n