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.
Learning Objectives
Successfully complete this lab by achieving the following learning objectives:
- Create a Snapshot
Take a snapshot of the
web01container:lxc snapshot web01 1.0- Launch and Review the New Container
Launch the new container:
lxc copy web01/1.0 web02 lxc start web02View the IPv4 address of the container and attempt to access a website:
lxc list curl <ipv4>- Create a Second Snapshot
Update the
web01container songinxstarts at boot:lxc exec web01 -- rc-update add nginx defaultTake a new snapshot:
lxc snapshot web01 1.1- Relaunch and Review the `web02` Container
Remove the
web02container and relaunch it with the new snapshot:lxc stop web02 lxc delete web02 lxc copy web01/1.1 web02 lxc start web02Ensure nginx is working by running
curlon the container’s IP:lxc list curl <ipv4>- Remove the Erroneous Snapshot
Remove the
1.0snapshot:lxc delete web01/1.0
