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LXC is Linux Container, allows you to run lightweight virtual servers on your computer.
It is better use <a href="https://backend.serverok.in/lxd">LXD</a> instead of LXC. LXD provides a much easier-to-use interface to LXC.
<ul>
<li><a href="https://backend.serverok.in/where-lxc-container-files-stored">Where LXC Container files stored?</a></li>
<li><a href="https://backend.serverok.in/lxc-create">Create lxc container with lxc-create</a></li>
<li><a href="https://backend.serverok.in/lxc-error-unable-to-fetch-gpg-key-from-keyserver">lxc error Unable to fetch GPG key from keyserver</a></li>
<li><a href="https://backend.serverok.in/lxc-container-networking-not-working">LXC container networking not working</a></li>
<li><a href="https://backend.serverok.in/static-ip-for-centos-lxc-container">Static IP for CentOS LXC container</a></li>
</ul>
To install lxc, run
<pre>
apt install -y lxc
</pre>
To create a VM, use 
<pre>
lxc-create -t download -n first-vm
</pre>
To list VM, use the command lxc-ls
<pre>
root@UNUSED:~# lxc-ls
first-vm 
root@UNUSED:~# lxc-ls -f
NAME STATE AUTOSTART GROUPS IPV4 IPV6 UNPRIVILEGED 
first-vm RUNNING 0 - 10.0.3.26 - false 
root@UNUSED:~#
</pre>
To start a VM, run
<pre>
lxc-start VM_NAME
</pre>
To login to a VM, run
<pre>
lxc-attach VM_NAME
</pre>
lxc config files
<pre>
/etc/lxc/default.conf
/etc/lxc/lxc-usernet
/var/lib/lxc
</pre>