Install Docker Swarm Cluster on Debian 10

This is diagram is used to deploy the 3 nodes Docker swarm.

On three nodes: docker01, docker02, and docker03.

apt-get update

Install Docker CE on Debian 10.

apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common

Add Docker GPG key and Docker repository.

curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"

Install Docker Engine

apt-get update
apt-get install docker-ce docker-ce-cli

Enable and start Docker daemon.

systemctl start docker
systemctl enable docker

+ Initialize Docker Swarm Cluster on node 1: docker01

docker swarm init --advertise-addr 192.168.5.46

Join docker02 and docker03 to the cluster.

Create a custom httpd image with the listening port is 8847.

We can check if the worker nodes have joined to cluster successfully using the command below:

docker node ls

+ Deploy Applications on Docker Swarm

Below is an example to deploy an Apache web service with the listening port is 8847 and service name is tunghttp

docker service create --name tunghttp -p 8847:80 httpd

+ Scale Applications on Docker Swarm to have high availability and high performance on 3 nodes.

docker service scale tunghttp=3
docker service ps tunghttp

Create a new index.html file on the docker host. Then, copy the file to the Apache webserver directory as a screenshot below.

<html>
<head>
<title>Tung A01</title> 
</head>
<body>
	<h1 Welcome to the web server that is deployed by Docker </h1>
	<img src="http://imagefromtheinternet.jpg">
</body>
</html>