docker-swarm

docker swarm clsuter setup:


docker swarm init --advertise-addr <Server IP address>

madan@madan-virtual-machine:~$ docker swarm init --advertise-addr 192.168.1.7
Swarm initialized: current node (kml5cngkmgyy8z3pq1kzjkrov) is now a manager.

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

    docker swarm join --token SWMTKN-1-0bwlosi553ul392ri48bm0zmyp1stptnae0rmix1i77cuznqx9-399xqhbujuso7wprs3muwhv37 192.168.1.7:2377

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

madan@madan-virtual-machine:~$ docker node ls
ID                            HOSTNAME                STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
kml5cngkmgyy8z3pq1kzjkrov *   madan-virtual-machine   Ready     Active         Leader           23.0.1



# Allow ports in both master and worker VM:
sudo ufw allow from any to any port 2377 proto tcp


In worker node:
# docker swarm join --token SWMTKN-1-0bwlosi553ul392ri48bm0zmyp1stptnae0rmix1i77cuznqx9-399xqhbujuso7wprs3muwhv37 192.168.1.7:2377




# In master VM:

# docker node ls

madan@madan-virtual-machine:~$ docker node ls
ID                            HOSTNAME                 STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
35bbbptsy3b14uc0vauh6ccov     devops-virtual-machine   Ready     Active                          23.0.1
kml5cngkmgyy8z3pq1kzjkrov *   madan-virtual-machine    Ready     Active         Leader           23.0.1
madan@madan-virtual-machine:~$



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Testing:]

Create Nginx service
# sudo docker service create --name web-server --publish 8084:80 nginx:latest

Verify status of deployment
# docker service ls


# Scale up:
docker service scale web-server=3


# access the application:
Open browser: localhost:8084