- A Cloud Guru
Installing Containers with LXC
LXC, which stands for Linux Containers, is a containerization solution that takes advantage of existing kernel features (such as namespaces and cgroups) to create container environments that are as close as possible to normal Linux installations, without the overhead of simulating hardware or running multiple kernels. In this learning activity, you are tasked with installing and configuring LXC in order to create multiple Linux containers.
Table of Contents
Install the LXC package.
# sudo apt-get install lxc
Set up the network device quota for the unprivileged user, `cloud_user`, to include 10 veth devices.
# sudo vim /etc/lxc/lxc-usernet
- Add the following line:
cloud_user veth lxcbr0 10
Copy the LXC configuration file
Copy the LXC configuration file to the
cloud_users’s home directory and append the uid and gid map for the
cloud_userto the file. Once completed, be sure to log out of the lab server and log back in to activate the new configuration.
.config/lxcin the users home directory:
# mkdir -p ~/.config/lxc
- Copy the
lxc default.conffile to the newly created directory:
# cp /etc/lxc/default.conf ~/.config/lxc/default.conf
Ensure a uid/gid map exists in
/etc/subgidfor the cloud user.
Copy the uid/gid map and add it to the configuration file in the user's home directory:
# vim ~/.config/lxc/default.conf
- Append the following (uid/gid map numbers may vary):
lxc.id_map = u 0 231072 65536 lxc.id_map = g 0 231072 65536
- Once this step is completed, log out of the lab server and log back in to activate the new configuration file.
Create a container
Create a container named
ubunturunning Ubuntu Xenial and a container named
centosrunning CentOS 7; both should use the amd64 architecture.
- Create the
ubuntucontainer using the
# DOWNLOAD_KEYSERVER="keyserver.ubuntu.com" lxc-create -n ubuntu -t download -- -d ubuntu -r xenial -a amd64
- Create the
centoscontainer using the
# DOWNLOAD_KEYSERVER="keyserver.ubuntu.com" lxc-create -n centos -t download -- -d centos -r 7 -a amd64
- Update the permissions on the
chmod +x /home/cloud_user/.local
- Create the
Start up the newly created servers as daemons running in the background.
Start up the containers using the
# lxc-start -n centos -d
# lxc-start -n ubuntu -d
To see that both of the containers are running run
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.