Docker Lab

The goal of this lab is to configure docker01 and gain experience using docker.

Parts:

1. Configuration
2. Install Docker
3. Install Docker Compose
4. "Hello SYS265" Docker image
5. Docker Arch Linux Container
6. Docker Web Application
7. Docker Networking
8. Dockerized Wordpress

Configuration:

To start I connected the system to the LAN.

After getting the system booted, I ran the command sudo nano /etc/netplan/00-installer-config.yaml . I then edited the file as followed (rescoure:

After I updated with the command sudo netplan apply, I did get a error about inconsistent indentation and had to update the file.

Next I needed to configure the hostname, to do this I ran the command sudo nano /etc/hostname. I changed it from ubuntu to Docker01-elizabeth. I confirmed by running hostnamectl.

After configuring hostname I needed to create a name user. To start I did sudo adduser elizabeth-adm. I then needed to add the user to the sudo user group, I used sudo usermod -aG sudo elizabeth-adm

I then ran the command sudo nano /etc/cloud/cloud.cfg and changed the preserve_hostname setting to true.

I then needed to configure the ssh file. I opened the file with sudo nano /etc/ssh/sshd_config. I then uncommented and add no to the PermitRootLogin. After I restarted ssh using sudo service ssh restart

I then needed to add docker01 to the domain. I followed this Rescource. To start I changed the hostname using the same command as earlier, but adding elizabeth.local to the end. Next I needed to configure the /resolve.conf file, but the domain was already there!

I then went into mgmt01 to update the DNS records with docker01.

I was unable to ssh, so I needed to do some further configuration. To start I changed the hosts by doing sudo nano /etc/hosts and changed the loopback addresses.

To join to the domain again I ran the command sudo apt-get install krb5-user samba sssd sssd-tools libnss-sss libpam-sss ntp ntpdate realmd adcli. I was then able to add AD01 as a administrative server.

After restarting ssh and editing the configuration file I was able to ssh in!

Docker

Using steps 1-3 of the rescoure linked in the lab I was able to install docker.

To start I made sure packages were updated using sudo apt update. I then ran the following commands to install docker:

#Allows apt to use packages over HTTPS:

sudo apt install apt-transport-https ca-certificates curl software-properties-common

#GPG key install

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add

#Add docker to APT sources

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable"

#Docker Install

sudo apt install docker-ce

sudo systemctl status docker

After I was able to run docker!

I then added Elizabeth-adm to docker by running sudo usermod -aG docker ${USER}. I was able to confirm by running su elizabeth-adm and then groups.

Install Docker Compose

Following the rescoure in the lab I needed to install the docker compose. To install I ran sudo curl -L "https://github.com/docker/compose/releases/download/1.27.4/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose, and then set the permissions using command sudo chmod +x /usr/local/bin/docker-compose.

"Hello SYS265" Docker image

I then ran the command docker run --rm archlinux:latest /bin/echo "Hello SYS-265 NOT SO SNOWY DAYS" to pull the Arch Linux command and then a echo to show my message.

Docker Arch Linux Container

For this section, I ran the below commands to see (from lab):

1. current version of Ubuntu on docker01.
2. current version of docker01's linux kernel.
3. Invoke a container of the stored Ubuntu image as well as an interactive bash command prompt.
4. the kernel being used by the Ubuntu container.

Docker Web Application

After looking into the containerization I was able to move on to the web installation. I ran the command docker run -d -P docker/getting-started to install a simple Python web application.

Docker Networking

With the networking running I needed to configure my firewal. I first installed with sudo apt install firewalld and then added my port using sudo firewall-cmd --permanent --add-port=32768/tcp. I was then able to run docker ps

Dockerized Wordpress