Lab
A Cloud Guru

Taking LXD Container Snapshots

One benefit Linux containers provide is the ability to quick spin up a number of containers. But from what are these containers based? LXD snapshots allow us to take point-in-time images of our containers and any work performed on these containers. In this lab, we take a preconfigured nginx-based web container and clone it to create the basis of a small web cluster.

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Path Info

Level

Beginner

Duration

15m

Published

Apr 03, 2020

Challenge

Create a Snapshot
Take a snapshot of the web01 container:
```
lxc snapshot web01 1.0
```
Challenge

Launch and Review the New Container
Launch the new container:
```
lxc copy web01/1.0 web02
lxc start web02
```
View the IPv4 address of the container and attempt to access a website:
```
lxc list
curl \<ipv4\>
```
Challenge

Create a Second Snapshot
Update the web01 container so nginx starts at boot:
```
lxc exec web01 -- rc-update add nginx default
```
Take a new snapshot:
```
lxc snapshot web01 1.1
```
Challenge

Relaunch and Review the `web02` Container
Remove the web02 container and relaunch it with the new snapshot:
```
lxc stop web02
lxc delete web02
lxc copy web01/1.1 web02
lxc start web02
```
Ensure nginx is working by running curl on the container's IP:
```
lxc list
curl \<ipv4\>
```
Challenge

Remove the Erroneous Snapshot
Remove the 1.0 snapshot:
```
lxc delete web01/1.0
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.