Clone the git repository¶
git clone https://github.com/itsziget/learn-docker.git
contains the installation of all the necessary components except the scripts below. You may need to restart your machine after the installation.
It fixes the missing hostname in
/etc/hosts, so you will not see error messages after using “sudo”. The script checks if the machine’s hostname is in the hosts file and writes into the file if the hostname was missing. In case of Ubuntu 16.04 it can copied into /etc/profile.d/.
xip.io generates domain names for the public DNS server based on the current WAN or LAN IP address of the host machine. It must be copied into /usr/local/bin/ with the filename “xip”. When you execute “xip”, a domain name will be shown (Ex.: 192.168.1.2.xip.io) which you can use for the examples. The command takes one optional parameter as a subdomain. Ex.: “xip web1”. The result would be: web188.8.131.52.2.xip.io
It uses the xip command to set the XIP environment variable so you can use the variable in a docker-compose.yml too.
Make sure you each script is executable before you continue. However, the above scripts are optional and you may not need them in a local virtual machine. If you don’t want to rely on automatic IP address detection, set the XIP variable manually.
Example projects are in the learn-docker/projects folder, so go to there.
Check the existence of
$XIP variable since you will need it for some examples:
If it does not exist or empty, then set the value manually or run the script below:
All off the examples were tested with Docker 20.10.1. The version of Docker Compose was 1.27.4. You can try with more recent versions but some behaviour could be different in the future.