20201124 docker swam (二)

課堂資訊

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Docker 技術筆記Learn or Die

Docker Swarm

• docker swarm vs. global mode

• rolling update vs. rollback

• label

課堂練習

Docker Swarm

vm1

docker service create --mode global --name myweb1 -p 8005:80 httpd

docker service ls

docker service rm myweb1

docker ps -a

docker service create --replicas 1 --name myweb1 -p 8000:80 httpd

docker service rm myweb1

docker network create --driver overlay mynet

docker service create --replicas 1 --network mynet --name web1 -p 8000:80 httpd

docker service create --replicas 3 --network mynet --name web2 -p 8001:80 httpd

docker service create --mode global --network mynet --name web3 -p 8002:80 httpd

docker service rm web1

docker service ls

docker service create --name web4 --replicas 3 -p 8004:80 httpd:2.4.43

docker service ls

docker service update --image httpd:2.4.46 web4

docker service rm web4

docker service create --name web4 --replicas 3 -p 8004:80 httpd:2.4.43

docker service update --image httpd:2.4.46 web4

docker service rm web2

docker service rm web3

docker service create --name web4 --replicas 6 -p 8004:80 httpd:2.4.43

docker service update --image httpd:2.4.46 --update-parallelism 2 --update-delay 10s web4

docker service rm web4

docker service create --name web4 --replicas 6 -p 8004:80 httpd:2.4.43

Rollback

docker service update --rollback web4

docker service rm web4

docker node update --label-add env=test vm2

docker node update --label-add env=test vm3

docker node inspect vm2

docker service create --constraint node.labels.env==test --replicas 2 --name web1 -p 8000:80 httpd

docker service update --constraint-add node.labels.env==prod web1

docker service rm web1

docker node update --label-rm env vm2

docker node update --label-rm env vm3

docker service create --constraint node.labels.env==test --replicas 2 --name web1 -p 8000:80 httpd

docker service update --constraint-rm node.labels.env==test web1

vm2

docker ps -a

docker rm -f `docker ps -aq`

關機

halt -p

開機後

docker pull httpd:2.4.43

docker pull httpd:2.4.46

vm3

docker ps -a

docker rm -f `docker ps -aq`

docker network ls

systemctl status docker