Here are the steps and output of walking through a docker swarm example setup about the insurance definition.
Configure your docker swarm manager
[root@centos02 ~]# docker swarm init --advertise-addr 192.168.1.12
Swarm initialized: current node (563sc30tf5l166mkkdibzvs6t) is now a manager.
To add a worker to this swarm, run the following command:
docker swarm join \
--token SWMTKN-1-5a6inmnn0t8ijtgb2vh77ynts6ql82oma5lhrci9lztt3qw2zn-c9lcqe1krk4dbzqv0zrzxhx4f \
192.168.1.12:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
[root@centos02 ~]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
563sc30tf5l166mkkdibzvs6t * centos02 Ready Active Leader
Run docker swarm join on a client node
[root@centos03 ~]# docker swarm join \ > --token SWMTKN-1-5a6inmnn0t8ijtgb2vh77ynts6ql82oma5lhrci9lztt3qw2zn-c9lcqe1krk4dbzqv0zrzxhx4f \ > 192.168.1.12:2377 This node joined a swarm as a worker.
List docker nodes
[root@centos02 ~]# docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 0bcqjh3vh9vi1z4xw10wf0g74 centos03 Ready Active 563sc30tf5l166mkkdibzvs6t * centos02 Ready Active Leader
Create a docker service
[root@centos02 ~]# docker service create --replicas 1 --name helloworld alpine ping docker.com 09ysfizftjtv16pdj1rahhvhr [root@centos02 ~]# docker service ls ID NAME REPLICAS IMAGE COMMAND 09ysfizftjtv helloworld 1/1 alpine ping docker.com
Check the service and see it is in “Replicated” mode.
[root@centos02 ~]# docker service inspect --pretty helloworld ID: 09ysfizftjtv16pdj1rahhvhr Name: helloworld Mode: Replicated Replicas: 1 Placement: UpdateConfig: Parallelism: 1 On failure: pause ContainerSpec: Image: alpine Args: ping docker.com Resources:
Notice how it is distributed across both nodes.
[root@centos02 ~]# docker service scale helloworld=5 helloworld scaled to 5 [root@centos02 ~]# docker service ps helloworld ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR 7ff4j884010o1lkjaucecpwt6 helloworld.1 alpine centos02 Running Running 3 minutes ago bt9gwmx8w0qpdj3s2i2ucj5f3 helloworld.2 alpine centos03 Running Running 6 seconds ago 3z9smbo19fbjgwktluq4q4ovd helloworld.3 alpine centos03 Running Running 6 seconds ago 3y9r4nz9jz9e61949mxl0d4nq helloworld.4 alpine centos02 Running Running 8 seconds ago 4f58klulpbuv9apk9c5xbvn55 helloworld.5 alpine centos02 Running Running 8 seconds ago [root@centos02 ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES e5f0392a9c4a alpine:latest "ping docker.com" 31 seconds ago Up 30 seconds helloworld.4.3y9r4nz9jz9e61949mxl0d4nq 97eeed4d6ec1 alpine:latest "ping docker.com" 31 seconds ago Up 30 seconds helloworld.5.4f58klulpbuv9apk9c5xbvn55 f696e8a925b0 alpine:latest "ping docker.com" 3 minutes ago Up 3 minutes helloworld.1.7ff4j884010o1lkjaucecpwt6 [root@centos02 ~]# docker service