LXC -- Linux Containers

 Reference:

https://www.youtube.com/watch?v=CWmkSj_B-wo

playlist: https://www.youtube.com/playlist?list=PL34sAs7_26wPfLNZ5NKoH0RKbTAWMlh2I

To check your OS kernel:

lsb_release -dirc

to check whether lxd installed.

dpkg -l | grep lxd

to check whether/where lxc command executables

which lxc

which lxd

To install lxc on ubuntu:

sudo apt install lxd

To check the status of the service:

sudo systemctl enable/start/status lxd

to add user to lxd group:

----------

to see group exists:

getent group lxd

to add user to group:

sudo gpasswd -a username lxd

id username

newgrp lxd

To initialize lxc:

----------------

lxd init -->all default options except select dir as storage backend

lxc remote list

lxc image list

lxc image list images: --->to list in the particular repo

lxc image list images:debian

lxc list

Frequent commands:

---------------------

uname -r -->kernel version

lxc launch ubuntu:16.04

lxc launch ubuntu:16.04 <name>

lxc stop <name>

lxc delete <name> --force --> if running

lxc copy <name1> <name2>

lxc move myubuntu myvm

lxc exec myvm bash

>free -m

>nproc

>uname -r

>ping anothervm.lxd

lxc exec myanotherubuntu su - ubuntu

lxc info myvm | less

pstree -p <pid>

lxc config show myvm | less

lxc profile list

lxc profile show default

lxc profile copy default custom

lxc launch ubuntu:16.04 mym2 --profile custom

No need to stop the linux container to set limits:

lxc config set myvm limits.memory 512MB

lxc profile edit custom

config:

 limits.memory: 512MB

 limits.cpu: 1

lxc launch ubuntu:16:04 myvm2 --profile custom

copy files:

lxc file push myfile myvm2/path_inside

lxc file pull myvm2/path_inside .

snapshot and restore:

for i in $(seq 5); do mkdir $i; done

lxc snapshot myvm2 snap1

lxc restore myvm2 snap1

nested containers:

lxc can be run inside these lxc containers.

But we need to set some settings.

lxc config set myvm2 security.privileged true

lxc config set myvm2 security.nesting true