Wed. Dec 7th, 2022

Aproximate time: 45 minutes

What is docker you may ask? Docker is an application that allows you to run microservices/apps in an isolated manner. They are similar to virtual machines, however allow you to use resources more efficiently, they are more portable than a virtual machine as well and rely on the host os more. I am going to show you how to install docker on Ubuntu Server.

Let’s get started:
1 – ssh into your device/vm/RPi

Update the repository and packages
2 – sudo apt update && sudo apt -y full-upgrade

Update this with important server ips, if you don’t have a DNS server.

3 – sudo nano -c /etc/hosts

127.0.0.1 localhost
127.0.1.1 hostname_here
### Docker Swarm on RPi4 ###
192.168.1.140    ohdoc01.cfs.loc ohdoc01
192.168.1.141    ohdoc02.cfs.loc ohdoc02
192.168.1.142    ohdoc03.cfs.loc ohdoc03
192.168.1.143    ohdoc04.cfs.loc ohdoc04

Let’s install all dependencies for docker
4 – sudo apt -y install apache2-utils apt-transport-https ca-certificates curl gnupg2 software-properties-common
5 – sudo curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add –
6 – sudo add-apt-repository “deb [arch=amd64] https://download.docker.com/linux/debian buster stable”

Stor this in a safe place.
7 – sudo htpasswd -nb admin secure_password

8 – cd /var/tmp
9 – sudo curl -fsSL https://get.docker.com -o get-docker.sh <- Download the script to install Docker.
10 – sudo chmod +x get-docker.sh <- Give right persmissionsto the script.
11 – sudo sh get-docker.sh <- Get and install Docker on your Server.
12 – sudo docker version <- Check to if it installed properly
13 – sudo docker info <- Get the docker info.
14 – sudo usermod -aG docker $USER <- Add your user to the Docker Group

Let’s install docker-compose to help deploy apps to the swarm
15 – sudo apt -y install docker-compose
16 – sudo docker-compose -version <- Check the Docker-Compose Version

Stop here if not building a swarm!

On the Master Node you need a place to store your work
17 – sudo mkdir -p projects
18 – cd /projects
19 – mkdir -p your_work_dir_here

If you are creating a swarm you need the following
20 – sudo docker swarm init

Go to the docker worker node and type the following to join the swarm
21 – sudo docker swarm join –token <token_here>

As far as a working docker install you now have one. If you need anymore information please feel free to contact us / me I will be happy to help in anyway I can.

Have a great day and please come back.

By Michael Cooper

30 years in it, Senior Systems Engineer

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