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Why LXC

Because we can pack all stuff in only one LXC container, it's container like usual OS, so it can run process as much as needed with default init system, opposite to Docker way with one container for one process.

Installing LXC on Ubuntu 20.04

sudo snap install lxd

Installing LXC on Ubuntu 18.04

sudo apt-get install lxd

To access container by it's name

# Set "10.0.3.1" as first DNS server
# could be different ways, depends on network manager
echo "nameserver 10.0.3.1" | sudo tee -a /etc/resolv-manual.conf
sudo rm /etc/resolv.conf && unlink /etc/resolv.conf
sudo ln -s /etc/resolv-manual.conf /etc/resolv.conf 
sudo resolvectl dns

Add container names to ~/.ssh/config with next settings:

cat <<EOF >> ~/.ssh/config
Host sd lb
StrictHostKeyChecking no
UserKnownHostsFile /dev/null
EOF

When IP changes after reboot or so, no need to modify ~/.ssh/known_hosts file.

After installation, we can open http://sd in browser or go inside by ssh root@sd.

Some useful commands

sudo lxc ls # list containers
sudo lxc delete -f sd # stop and remove container
sudo lxc stop sd # stop container
sudo lxc start sd # start container
sudo lxc copy sd sd1 # clone container
sudo lxc exec sd -- hostname -I # IP of container
# go inside
sudo lxc shell sd
ssh root@sd