Thursday, March 10, 2022

How to Create Docker Swarm with Multipass & Virtualbox

On this tutorial, we're gonna creating a docker swarm with tool called 'multipass'. You can install this tool (either in Mac or Linux) easly with brew install multipass. Another software required is Virtualbox.
To install multipass in macOS, you can follow my tutorial here:
for this little experiment, you will create a minimal setup of Docker Swarm, as per my understanding one manager and two worker nodes will be sufficient along with one server for NFS shared storage.
$ multipass launch -n manager 
$ multipass launch -n worker1 
$ multipass launch -n worker2 
$ multipass launch -n nfsserver
running above commands with defaults, created required VMs for this POC.
$ multipass list 
Name                    State             IPv4             Image manager                 Running      Ubuntu 20.04 LTS 
nfsserver               Running      Ubuntu 20.04 LTS 
worker1                 Running      Ubuntu 20.04 LTS 
worker2                 Running      Ubuntu 20.04 LTS  
Install Docker CE in manager and worker nodes is pretty straight forward, run below scripts as root user
$ apt-get update && apt-get upgrade -y 
$ apt-get remove docker docker-engine -y 
$ apt-get install apt-transport-https ca-certificates curl gnupg2 software-properties-common python-setuptools -y 
$ curl -fsSL | sudo apt-key add - 
$ add-apt-repository "deb [arch=amd64] $(lsb_release -cs) stable" $ apt-get update 
$ apt-get install docker-ce -y 
$ systemctl enable docker 
$ systemctl restart docker 
$ apt install python3-pip -y 
$ pip install docker-compose 
$ usermod -aG docker ubuntu
Login to manager, worker1 and worker2 shell and verify if docker is properly installed, by executing below command from each VM.
docker --version Docker version 20.10.8, build 3967b7d

Initialize docker manager instance
$ docker swarm init --advertise-addr
run join command from each worker VM
$ docker swarm join --token
check if the setup is working as expected
$ docker node ls 
jklhgjfturtaiuskghmv *   manager    Ready     Active         Leader           20.10.8 
jkhgutyikjhgmnjghmvn     worker1    Ready     Active                          20.10.8 
cfgrtdyfhgvncfghggvh     worker2    Ready     Active                          20.10.8
try installing an nginx web server in this cluster and verify if container deployment is working as expected
$ docker service create --name my-web --publish 8080:80 --replicas 2 nginx 
$ docker service ls ID             NAME      MODE         REPLICAS   IMAGE          PORTS s9eabxqjgu98   my-web    replicated   2/2        nginx:latest   *:8080->80/tcp
above command deploys nginx webserver with 2 replicas, check where these 2 containers are deployed to
ubuntu@manager:~$ docker service ps my-web ID             NAME       IMAGE          NODE      DESIRED STATE   CURRENT STATE            ERROR     PORTS 
jghasgghjda   my-web.1   nginx:latest   worker2   Running         Running 48 seconds ago 
fdreytfghca   my-web.2   nginx:latest   manager   Running         Running 56 seconds ago
enjoy it!


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