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--- notes:docker_swarm [2025/03/05 11:13] – créée frater
+++ notes:docker_swarm [2025/03/05 13:41] (Version actuelle) – [Validate the swarm status] frater
@@ Ligne 1: / Ligne 1: @@
 ====== Docker Swarm ======
+===== Install Docker =====
+[[https://docs.docker.com/engine/install/debian/|source]]
+==== Install using the apt repository ====
+Before you install Docker Engine for the first time on a new host machine, you need to set up the Docker apt repository. Afterward, you can install and update Docker from the repository.
+==== Set up Docker's apt repository. ====
+To setup official's Docker repository, run (as ''root''):
+<cli bash>
+# Add Docker's official GPG key:
+apt update
+apt install ca-certificates curl
+install -m 0755 -d /etc/apt/keyrings
+curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc
+chmod a+r /etc/apt/keyrings/docker.asc
+# Add the repository to Apt sources:
+echo \
+  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian \
+  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
+  tee /etc/apt/sources.list.d/docker.list > /dev/null
+apt update
+</cli>
+==== Install the Docker packages. ====
+To install the latest version, run (as ''root''):
+<cli>
+apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+</cli>
+===== Create a swarm =====
+After you complete the setup steps, you're ready to create a swarm. Make sure the Docker Engine daemon is started on the host machines.
+Open a terminal and ssh into the machine where you want to run your manager node. This example we uses a machine named ''docker00''.
+Run the following command to create a new swarm:
+<code bash>
+docker swarm init --advertise-addr <MANAGER-IP>
+</code>
+In the tutorial, the following command creates a swarm on the manager1 machine:
+<cli>
+root@docker01:~# docker swarm init --advertise-addr 192.168.80.10
+Swarm initialized: current node (dxn1zf6l61qsb1josjja83ngz) is now a manager.
+To add a worker to this swarm, run the following command:
+    docker swarm join --token SWMTKN-1-2[snip]wlr 192.168.80.10:2377
+To add a manager to this swarm, run ''docker swarm join-token manager'' and follow the instructions.
+</cli>
+<WRAP center round important>
+Take note of the token provided
+</WRAP>
+==== Adding manager node ====
+To add a manager to this swarm, run ''docker swarm join-token manager'' and follow the instructions.
+==== Adding worker node ====
+To add a worker to this swarm, run the following command:
+<cli>
+root@docker01:~# docker swarm join \
+    --token SWMTKN-1-2[snip]wlr \
+.168.80.10:2377
+</cli>
+The ''--advertise-addr'' flag configures the manager node to publish its address as ''192.168.80.10''. The other nodes in the swarm must be able to access the manager at the IP address.
+The output includes the commands to join new nodes to the swarm. Nodes will join as managers or workers depending on the value for the ''--token'' flag.
+==== Validate the swarm status ====
+Run ''docker info'' to view the current state of the swarm:
+<cli>
+root@docker00:~# docker info
+Client: Docker Engine - Community
+ Version:    28.0.1
+ Context:    default
+ Debug Mode: false
+ Plugins:
+  buildx: Docker Buildx (Docker Inc.)
+    Version:  v0.21.1
+    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
+  compose: Docker Compose (Docker Inc.)
+    Version:  v2.33.1
+    Path:     /usr/libexec/docker/cli-plugins/docker-compose
+Server:
+ Containers: 6
+  Running: 3
+  Paused: 0
+  Stopped: 3
+ Images: 6
+ Server Version: 28.0.1
+ Storage Driver: overlay2
+  Backing Filesystem: extfs
+  ...snip...
+Swarm: active
+  NodeID: nh0izhq4pa2plmjdvy00f8um7
+  Is Manager: true
+  ClusterID: mbwi9gcqsueen8mcanvme3zc8
+  Managers: 1
+  Nodes: 3
+  ...snip...
+</cli>
+Run the ''docker node ls'' command to view information about nodes:
+<cli>
+root@docker00:~# docker node ls
+ID                            HOSTNAME       STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
+nh0izhq4pa2plmjdvy00f8um7 *   deb-docker00   Ready     Active         Leader           28.0.1
+m0t8hrymi0jlmy1jpf85tknt     deb-docker01   Ready     Active                          28.0.1
+tebmpkb8og8ko2jfa2zq0z5oc     deb-docker02   Ready     Active                          28.0.1
+</cli>
+The * next to the node ID indicates that you're currently connected on this node.
+Docker Engine Swarm mode automatically names the node with the machine host name.
+<WRAP center round info>
+In my labs, I've setup 3 nodes, deb-docker00, deb-docker01, deb-docker02.
+</WRAP>

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