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Docker Swarm

Topics:

Installation to click here

Creating three virtual machines & more cmds to click here

Docker Swarm (installation):

Docker info; check swarm active or inactive

    docker info | head -50

In master node

    docker swarm init                       

    doker node ls

Creating three virtual machines (vm)

  1. master node (vm)
  2. worker1(vm)
  3. worker2(vm)

master node:

getting a token from master nodee......copy this token and paste it in worker1 and other token in worker2 and save these tokens for future

workder1:

    paster token1 from master here
    docker swarm join-token master

worker2:

    paster token2 from master here
    docker swarm join-token master

worker3:

    paster token3 from master here
    docker swarm join-token manager



    docker node ls

worker2:

//This node is out from cluster

    docker swarm leave  
    docker node ls

    docker swarm | head -50

Manager:

    docker node ls
    docker node rm 
    doker info less


    docker node inspect worker1 | less
    docker node inspect worker2 | less
    docker node promote worker1 worker2
    docker node promote worker1 worker2

    docker node ls

    doker container run -it alpine ping 102.168.25.10

How to Install and Configure Docker Swarm on Ubuntu

Manager Nodes and Worker Nodes

Docker Swarm is made up of two main components:

Manager Nodes
Worker Nodes

Getting Started:

Before starting, you should update your system repository with the latest version. You can update it with the following command:

    sudo apt-get update -y && sudo apt-get upgrade -y

Once the repository is updated, restart the system to apply all the updates.

Install Docker:

You will also need to install the Docker engine on both nodes. By default, Docker is not available in the Ubuntu 16.04 repository. So you will need to set up a Docker repository first. You can start by installing the required packages with the following command:

sudo apt-get install apt-transport-https software-properties-common ca-certificates -y

Next, add the GPG key for Docker:

    wget https://download.docker.com/linux/ubuntu/gpg && sudo apt-key add gpg

Then, add the Docker repository and update the package cache:

sudo echo "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable" >> /etc/apt/sources.list

    sudo apt-get update -y

Finally, install the Docker engine using the following command:

    sudo apt-get install docker-ce -y

Once the Docker is installed, start the Docker service and enable it to start on boot time:

    sudo systemctl start docker && sudo systemctl enable docker By default,

Configure firewall

You will need to configure firewall rules for a swarm cluster to work properly on both nodes. Allow the ports 7946, 4789, 2376, 2376, 2377, and 80 using the UFW firewall with the following command:

sudo ufw allow 2376/tcp && sudo ufw allow 7946/udp && sudo ufw allow 7946/tcp && sudo ufw allow 80/tcp && sudo ufw allow 2377/tcp && sudo ufw allow 4789/udp Next, reload the UFW firewall and enable it to start on boot: sudo ufw reload && sudo ufw enable Restart the Docker service to affect the Docker rules: sudo systemctl restart docker

Create Docker Swarm cluster:

First, you will need to initialize the cluster with the IP address, so your node acts as a Manager node. On the Manager Node, run the following command for

advertising IP address:

docker swarm init --advertise-addr 192.168.0.103 You should see the following output:

Swarm initialized: current node (iwjtf6u951g7rpx6ugkty3ksa) is now a manager. To add a worker to this swarm, run the following command: docker swarm join --token SWMTKN-1-5p5f6p6tv1cmjzq9ntx3zmck9kpgt355qq0uaqoj2ple629dl4-5880qso8jio78djpx5mzbqcfu 192.168.0.103:2377 To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

Add Worker Node to swarm cluster:

    docker swarm join --token SWMTKN-1-5p5f6p6tv1cmjzq9ntx3zmck9kpgt355qq0uaqoj2ple629dl4-5880qso8jio78djpx5mzbqcfu 192.168.0.103:2377


    docker node ls

Launch web service in Docker Swarm:

    docker service create --name webserver -p 80:80 httpd
    docker service ls
    docker service scale webserver=2
    docker service ps webserver

Test Docker Swarm: type on browser

    192.168.0.103

🔚