somoso / multipass-get-ip-addr

Get IP Address from multipass command line tool

multipass-get-ip-addr

Get IP Address from multipass command line tool. Based off this guide to getting Docker CLI on macOS.

Multipass's containers can change IP addresses when connecting to a new place (especially if you have a MacBook like me).

This was created so that when the shell is initialised (i.e. every time a new terminal instance is created - tab or window), the new shell will attempt to get the latest IP address info.

multipass's info output will give this:

Name:           docker-host
State:          Running
IPv4:           192.168.64.3
                172.17.0.1
Release:        Ubuntu 20.04.3 LTS
Image hash:     10f8ae579fbf (Ubuntu 20.04 LTS)
Load:           0.00 0.00 0.01
Disk usage:     2.3G out of 4.7G
Memory usage:   186.4M out of 981.3M
Mounts:         --

Whereas multipass-get-ip-addr.py will simply return

192.168.64.3

allowing you to add an entry into your .bashrc/.zshrc shell like e.g.:

DOCKER_HOST=tcp://$(~/multipass_get_ip_addr.py docker-host):2375
export DOCKER_HOST

and get the latest IP address info in a new shell.

Setup

1. Read the python script and make sure you are comfortable with it. Don't go running code you don't feel comfortable with, especially when sticking it in your .bashrc/.zshrc.
2. Download either the repo or the script itself and place it somewhere - remember the location. In my example I'll use ~.
3. Give the script executable permissions (chmod +x ~/multipass_get_ip_addr.py in the terminal will do, replacing ~ with your directory).
4. Put the following in your ~/.bashrc or ~/.zshrc file:

DOCKER_HOST=tcp://$(~/multipass_get_ip_addr.py docker-host):2375
export DOCKER_HOST

Replacing ~ in ~/multipass_get_ip_addr.py with your directory.

5. Run source ~/.bashrc or source ~/.zshrc depending on your shell. See if there are any errors. If there are, either fix them, report them as an issue, or just undo the changes in your .*shrc file and delete the script.

If you have no issues, try running a command like docker images and see if there any issues. If not, you've successfully setup multipass with docker