Docker mini project
What you will learn here about Docker
- Docker mini project
Docker mini project
1)Initialize Docker Swarm
docker swarm init
2)Create a docker service with the following details
image: tomcat
name: http
Replicas: 2
port: 80
update-delay: 10s
docker service create --name http --replicas 2 -p 80 --update-delay 10s tomcat
3)Update the above service with a newer image tomcat
docker service update --image tomcat http
4)Scale the above service to 4 replicas
docker service update --replicas=4 http
5)Create a docker overlay network with name app-network
docker network create -d overlay app-network
6)Update http service and add it to app-network network
docker service update --network-add name=app-network http
7)Create a secret with name redis_password and content John@Dow
printf "John@Dow" | docker secret create redis_password -
8)Create another Docker service with following details
image: redis:alpine
name: redis
secret: redis_password
mode: global
docker service create --name redis --secret redis_password --mode global redis:alpine
9)Update the Leader node and add a label color=red
Please Replace <HOSTNAME> With your hostname which is shown below
docker node ls docker node update --label-add color=red <HOSTANME>
10)Create a docker service with tomcat image with name tomcat-red-only. Add a constraint that the service will be deployed on node with label color=red
docker service create --name tomcat-red-only --constraint node.labels.color==red tomcat
