Docker Swarm Installation

 Install docker on Master and worker node and master node execute docker swarm init command.

[root@ip-172-31-34-29 ~]# docker swarm init

Swarm initialized: current node (xk88ov6mds5qdmzaj2obkfwyp) is now a manager.

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

docker swarm join --token SWMTKN-1-58apbdwqjurmocvp1mlbgu85w8340g8beh65ztuvjw43x30cqp-bqthz5iqs32vtu0tiuc6efqhr 172.31.34.29:2377

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

Add worker node and manager in swarm cluster.

docker swarm join-token worker

docker swarm join-token manager

Remove manager and worker node:

docker swarm leave

#docker node ls ==> to check swarm cluster node details.

===============

v2.16.0

sudo curl -L "https://github.com/docker/compose/releases/download/{v2.16.0}/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

step-1) Create 2 node

step 2) One master and one worker

step 3) make sure docker installed on both the host.

step 4) #docker --version

step 5) execute below commands on master node

   #docker swarm init

step 6) execute below command on worker node:

docker swarm join --token SWMTKN-1-58apbdwqjurmocvp1mlbgu85w8340g8beh65ztuvjw43x30cqp-bqthz5iqs32vtu0tiuc6efqhr 172.31.34.29:2377  ==> PLease check docker swarm init command output.

step 7) execute below commands on master node:

   #docker node ls

   #docker run -it -d -p 8080:8080 -v /var/run/docker.sock:/var/run/docker.sock dockersamples/visualizer

   (https://github.com/dockersamples/docker-swarm-visualizer)

step 8)  create yml file and deplyo it in swarm cluster.

[root@master ~]# cat sample.yml

version: '3'

services:

  bb-app:

    image: nginx

    ports:

      - "8000:3000"

  

 docker stack deploy -c sample.yml demo

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docker swarm init add what you get to worker node --open the port

docker node ls

docker service ls

docker run -it -d -p 8080:8080 -v /var/run/docker.sock:/var/run/docker.sock dockersamples/visualizer

docker ps -a

docker service create --name nginxweb -p 8081:80 nginx

docker service create --name nginxweb1 -p 8082:80 --replicas 5 nginx

docker service ps nginxweb1

docker service scale nginxweb1=7

docker service scale nginxweb1=1

docker node update --availability drain docker

docker node update --availability active docker

docker node ls