Kbaran at 07:13, 29 August 2018

2018-08-29T07:13:10Z

New page

[[Category:Docker]]
[[Category:course_code_dockcm]]

{{Copyright Notice}}

== Author ==
* [http://www.kamilbaran.pl Kamil Baran]
<br />

== Docker Swarm mode ==

* Docker Swarm is a native clustering tool that turns a group of Docker engines into a single, virtual Docker Engine.
** When you run Docker Engine outside of swarm mode, you execute container commands.
** When you run the Engine in swarm mode, you orchestrate services.
* Key futures
** Cluster management integrated with Docker Engine
** Declarative service model (scaling, desired state reconciliation, rolling updates)
** Multi-host networking
* Requirements - 3 networked VM's
** first one with docker-machine installed, all commands should be executed in terminal on this member
** two others (server-s1, server-s2) with docker engine
<br />

* Create cluster manager
<syntaxhighlight lang="Bash">
$ eval $(docker-machine env server-s0)
$ docker swarm init --advertise-addr 11.0.2.10
</syntaxhighlight>

* Check cluster state and list of nodes
<syntaxhighlight lang="Bash">
$ docker info
$ docker node ls
</syntaxhighlight>

* Add another node to the cluster
<syntaxhighlight lang="Bash">
$ docker swarm join-token worker
$ eval $(docker-machine env server-s1)
$ docker swarm join --token SWMTKN-1-3nt...sfe 10.0.2.10:2377
</syntaxhighlight>

* Create, inspect and scale service called ''training''
<syntaxhighlight lang="Bash">
$ eval $(docker-machine env server-s0)
$ docker service ls
$ docker service create --replicas 1 --name training kamilbaran/nobleprog_training:training_app_v1
$ docker service inspect --pretty training
$ docker service ps training
$ docker ps
$ docker service scale training=5
</syntaxhighlight>

* Rolling update of a service
<syntaxhighlight lang="Bash">
$ docker service update --update-delay 7s training
$ docker service update --image kamilbaran/nobleprog_training:training_app_v2 training
$ docker service inspect --pretty training
$ docker service ps training
</syntaxhighlight>

* Ingress network and routing mesh
<syntaxhighlight lang="Bash">
$ docker service create --name training-app --publish 80:80 --replicas 1 kamilbaran/nobleprog_training:training_app_v1
$ docker service ps training-app
$ curl server-s0
$ curl server-s1
$ while :; do ((i++)); curl --connect-timeout 1 server-s0/?count=$i; sleep 1; done
</syntaxhighlight>

* Removing a service and a node
<syntaxhighlight lang="Bash">
$ docker service rm training training-app
$ docker node rm server-s2
</syntaxhighlight>
<br />

Docker Swarm (KB) - Revision history

Kbaran at 07:13, 29 August 2018