15 minutes with Docker Swarm Mode

15 minutes with Docker Swarm Mode.md

3 x Cluster on AWS

• manager1
• worker1
• worker2

Docker-machine commands

Use docker-machine to lay down 3 x hosts on AWS using docker-engine 1.12

docker-machine create --driver amazonec2  --amazonec2-private-address-only --engine-install-url https://test.docker.com/ levenson-docker-swarm-manager1 
docker-machine create --driver amazonec2  --amazonec2-private-address-only --engine-install-url https://test.docker.com/ levenson-docker-swarm-worker1 
docker-machine create --driver amazonec2  --amazonec2-private-address-only --engine-install-url https://test.docker.com/ levenson-docker-swarm-worker2 

Bootstrap cluster

On manager1

docker swarm init --listen-addr <manager1:eth0-addr>:2377

On worker1/2

docker swarm join  <manager1:eth0-addr>:2377

Confirm Cluster State

docker node ls
ID                           NAME                            MEMBERSHIP  STATUS  AVAILABILITY  MANAGER STATUS
2d38pr0i29f3b0ow0h124pl3t    levenson-docker-swarm-worker2   Accepted    Ready   Active        
7q62jyv94ofnr66rsp1uqa730 *  levenson-docker-swarm-manager1  Accepted    Ready   Active        Leader
8zfyhauh35avz5t25gz0j1ugy    levenson-docker-swarm-worker1   Accepted    Ready   Active

Deploying services

docker service create --replicas 1 --name croc-hunter -p 8080:80 --update-delay 10s --update-parallelism 1 lachlanevenson/croc-hunter:v1
docker service tasks croc-hunter
docker service inspect croc-hunter

Scale services

docker service scale croc-hunter=3
docker service tasks croc-hunter

Rolling-update services

docker service update --image lachlanevenson/croc-hunter:v2 croc-hunter
docker service tasks croc-hunter

Drain a node

docker service tasks croc-hunter
docker node update --availability drain levenson-docker-swarm-worker1
docker node inspect --pretty levenson-docker-swarm-worker1
docker service tasks croc-hunter
docker node update --availability active levenson-docker-swarm-worker1
docker node inspect --pretty levenson-docker-swarm-worker1

unable to find the tasks command on latest release 1.12.0.

docker@infra:~$ docker service tasks

Usage: docker service COMMAND

Manage Docker services

Options:
--help Print usage

Commands:
create Create a new service
inspect Display detailed information on one or more services
ps List the tasks of a service
ls List services
rm Remove a service
scale Scale one or multiple services
update Update a service

Run 'docker service COMMAND --help' for more information on a command.

docker@infra:$ docker --versiondocker@infra:$ docker version
Client:
Version: 1.12.0
API version: 1.24
Go version: go1.6.3
Git commit: 8eab29e
Built: Thu Jul 28 23:54:00 2016
OS/Arch: linux/amd64

Server:
Version: 1.12.0
API version: 1.24
Go version: go1.6.3
Git commit: 8eab29e
Built: Thu Jul 28 23:54:00 2016
OS/Arch: linux/amd64
Docker version 1.12.0, build 8eab29e

with 1.12 task sub command deprecated.

@Laxman-SM It seems the docker service tasks command has been replaced with docker service ps