- Lab
-
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- Cloud

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.

Lab Info
Table of Contents
-
Challenge
Install the LXC package.
# sudo apt-get install lxc
-
Challenge
Set up the network device quota for the unprivileged user, `cloud_user`, to include 10 veth devices.
- Edit
/etc/lxc/lxc-usernet
:
# sudo vim /etc/lxc/lxc-usernet
- Add the following line:
cloud_user veth lxcbr0 10
- Edit
-
Challenge
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 thecloud_user
to the file. Once completed, be sure to log out of the lab server and log back in to activate the new configuration.- Create
.config/lxc
in the users home directory:
# mkdir -p ~/.config/lxc
- Copy the
lxc default.conf
file to the newly created directory:
# cp /etc/lxc/default.conf ~/.config/lxc/default.conf
-
Ensure a uid/gid map exists in
/etc/subuid
and/etc/subgid
for 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
-
Challenge
Create a container
Create a container named
ubuntu
running Ubuntu Xenial and a container namedcentos
running CentOS 7; both should use the amd64 architecture.- Create the
ubuntu
container using thedownload
template:
# DOWNLOAD_KEYSERVER="keyserver.ubuntu.com" lxc-create -n ubuntu -t download -- -d ubuntu -r xenial -a amd64
- Create the
centos
container using thedownload
template:
# DOWNLOAD_KEYSERVER="keyserver.ubuntu.com" lxc-create -n centos -t download -- -d centos -r 7 -a amd64
- Update the permissions on the
.local
folder:
chmod +x /home/cloud_user/.local
- Create the
-
Challenge
Start up the newly created servers as daemons running in the background.
Start up the containers using the
-d
option:# lxc-start -n centos -d
# lxc-start -n ubuntu -d
To see that both of the containers are running run
lxc-ls -f
About the author
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