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Swarm Setup Guide

Basic guide to setup docker swarm for monitoring system.

You BETTER read Docker official docs than to read this.

This document is basically copy of official docs.

Install

Based on over CentOS 8

sudo yum install -y yum-utils

sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

Install the yum-utils package (which provides the yum-config-manager utility) and set up the repository.

sudo yum install docker-ce docker-ce-cli containerd.io docker-compose-plugin

Install the latest version of Docker Engine, containerd, and Docker Compose.

yum list docker-ce --showduplicates | sort -r

sudo yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io docker-compose-plugin

Or list the available versions in the repo, then select and install.

sudo systemctl start docker

Start Docker.

sudo systemctl status docker

● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: active (running) since...

If status is active (running), the installation is successful.

Run

The following ports must be available. On some systems, these ports are open by default.

  • TCP port 2377 : cluster management communications
  • TCP/UDP port 7946 : communication among nodes
  • UDP port 4789 : overlay network traffic
docker swarm init --advertise-addr <MANAGER-IP>

Create a new swarm with advertise address (IP of Manager Node).

docker swarm join-token worker

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-<WORKER-TOKEN> <MANAGER-IP>:2377

Run output commands in worker server to join the swarm.

docker node ls

ID       HOSTNAME     STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
ID_1 *   HOSTNAME_1   Ready     Active         Leader           20.10.17
ID_2     HOSTNAME_2   Ready     Active                          20.10.17
ID_3     HOSTNAME_3   Ready     Active                          20.10.17

Run the docker node ls command to view information about nodes.