Docker Lab
In this lab, you will setup Docker and customize Docker images.
Requirements:
Participants are requested to have a computer with Windows 8/10/11 (8GB RAM, 25GB free disk space) with Virtualbox (version 6 or higher) hypervisor and PuTTY installed.
In Virtualbox, correct 'Extension pack' should be installed.
VM Setup
Download VM from the following Link.
https://docs.learn.ac.lk/index.php/s/YcojJ2544b40Zw4
Import the VM to Virtualbox.
Username and Password: docker
May have to create Virtualbox Host-Only Network Adapter
File > Host Network Manager > Create
Test internet connectivity.
Login using PuTTY.
Login as root to the provided VM.
Setup Docker
apt-get install -y docker.io systemctl enable docker.service
Managing Docker
List Docker images
docker image ls
Docker image search (Put an application name as image name, e.g.: apache)
docker search <image name>
Download a Docker image
docker pull <image name>
List docker containers that are currently running
docker container ls
Run a Docker image of a web server
docker run -d --name <name> -p 80:80 -d <image name>
Stop a Docker container
docker stop <container name/ID>
Setup a Docker image
Create a directory and go inside it.
mkdir <directory name> cd <directory name>
Make Dockerfile and insert the following content to it.
nano Dockerfile
FROM php:8.0-apache COPY index.php /var/www/html/ EXPOSE 80 CMD apachectl -D FOREGROUND
Make index.php and insert the following content to it.
<!DOCTYPE html>
<html>
<body>
<?php
date_default_timezone_set("Asia/Colombo");
echo "The time is " . date("h:i:sa");
?>
</body>
</html>
Docker Hub Account Setup
Create an account
Choose ‘Personal Plan’ (Continue with free) if asked
Create a Repository
Build a Docker image
docker build . -t <Docker Hub username>/<repository name>:v1
.
Share a Docker image
docker login -u <docker hub username> docker push <docker hub username>/<respository name>:v1 docker logout
Now you can view the uploaded Docker image in your Docker Hub account.
LXC Lab
In this lab, you will setup a LXC.
Requirements:
Same as the above Docker lab.
Virtual Machine (VM) Setup
Download VM from the following Link.
https://docs.learn.ac.lk/index.php/s/YcojJ2544b40Zw4
Import the VM to Virtualbox.
Username and Password: docker
May have to create Virtualbox Host-Only Network Adapter
File > Host Network Manager > Create
Test internet connectivity.
Login as root using PuTTY.
Setup LXC
Initiate LXC.
lxd init Would you like to use LXD clustering? (yes/no) [default=no]: Do you want to configure a new storage pool? (yes/no) [default=yes]: Name of the new storage pool [default=default]: Name of the storage backend to use (btrfs, dir, lvm) [default=btrfs]: dir Would you like to connect to a MAAS server? (yes/no) [default=no]: Would you like to create a new local network bridge? (yes/no) [default=yes]: no Would you like to configure LXD to use an existing bridge or host interface? (yes/no) [default=no]: no Would you like LXD to be available over the network? (yes/no) [default=no]: Would you like stale cached images to be updated automatically? (yes/no) [default=yes] Would you like a YAML "lxd init" preseed to be printed? (yes/no) [default=no]:
Edit network configuration.
vi /etc/netplan/00-installer-config.yaml
Make sure you edit the network interfaces as per your installation details. Don't remove any interface.
network:
version: 2
ethernets:
enp0s3:
dhcp4: yes
bridges:
lxdbr0:
dhcp4: yes
interfaces:
- enp0s3
netplan apply
Modify the default container profile to add bridged network.
lxc profile edit default
config: {}
description: Default LXD profile
devices:
eth0:
nictype: bridged
parent: lxdbr0
type: nic
root:
path: /
pool: default
type: disk
name: default
used_by: []
Check remote repositories
lxc remote list
Local repositories
lxc image list
Check remote images.
lxc image list images: lxc image list images:ubuntu
Create a Ubuntu Container.
lxc launch ubuntu:22.04 test-ct lxc list
Login to container
lxc exec test-ct bash
Make a snapshot
lxc snapshot test-ct test-ct1
Delete a container
lxc stop test-ct lxc delete --force test-ct
