m99coder/README.md

## README.md

      
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              README.md
            
          
    Docker Swarm

Initialization

# on leader node
docker swarm init
docker node ls

# on worker nodes
docker swarm join --token <TOKEN> <PRIVATE-IP>:2377

# retrieve join token if already initialized
docker swarm join-token worker
docker swarm join-token manager
Service

docker service create \
  --name web-app \
  --publish published=80,target=3000 \
  --replicas 3 \
  web-app
  
docker service ls

# scale up
docker service scale web-app=5

# list replicas
docker service ps web-app
Backup & Restore

# backup
systemctl stop docker
tar czvf swarm.tgz /var/lib/docker/swarm/
scp swarm.tgz cloud_user@<PRIVATE-IP>:/home/cloud_user

# restore
tar zxvf swarm.tgz
cd var/lib/docker/
cp -rf swarm/ /var/lib/docker/

systemctl restart docker
docker swarm init --force-new-cluster

# on worker nodes
docker swarm leave
docker swarm join --token <TOKEN> <PRIVATE-IP-OF-BACKUP-SERVER>:2377
Management

# prevent node from being selected for service deployments
docker node update --availability drain <NODE-ID>