How to transfer the files between Linux containers and the host system on Ubuntu 21.04

To Transfer The Files Between Linux Containers And Host System On Ubuntu 21.04

Introduction:

Linux Containers provide OS-level virtualization through a virtual environment containing its own processes and network space, as well as resource isolation through control groups. LXC provides a userspace container object that provides full resource isolation and control for a system or an application based on these new functionalities.

Installation Procedure:

Step 1: Check the OS version by using the below command

root@linuxhelp:~# lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 21.04
Release:	21.04
Codename:	hirsute

Step 2: Launch the Cent OS 8 container by using the below command

root@linuxhelp:~# lxc launch images:centos/8/amd64 test1
Creating test1
Starting test1

Step 3: Launch the Ubuntu 22.04 container by using the below command

root@linuxhelp:~# lxc launch images:ubuntu/22.04/amd64 test2
Creating test2
Starting test2 

Step 4: List the available Linux container by using the below command

root@linuxhelp:~# lxc list
+-------+---------+-----------------------+-----------------------------------------------+-----------+-----------+
| NAME  |  STATE  |         IPV4          |                     IPV6                      |   TYPE    | SNAPSHOTS |

+-------+---------+-----------------------+-----------------------------------------------+-----------+-----------+
| test1 | RUNNING | 10.241.214.182 (eth0) | fd42:d310:820b:2411:216:3eff:fe21:be8 (eth0)  | CONTAINER | 0         |
+-------+---------+-----------------------+-----------------------------------------------+-----------+-----------+
| test2 | RUNNING | 10.241.214.140 (eth0) | fd42:d310:820b:2411:216:3eff:fedc:6f81 (eth0) | CONTAINER | 0         |
+-------+---------+-----------------------+-----------------------------------------------+-----------+-----------+

Step 5: Login to the test1 container’s Shell by using the below command

root@linuxhelp:~# lxc exec test1 bash

[root@test1 ~]# cat /etc/os-release 
NAME="CentOS Linux"
VERSION="8"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"

[root@test1 ~]# exit
exit

root@linuxhelp:~# lxc exec test2 bash 

root@test2:~# lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu Jammy Jellyfish (development branch)
Release:	22.04
Codename:	jammy

root@test2:~# touch linuxhelp

root@test2:~# exit
exit

root@linuxhelp:~# lxc file pull test2/root/linuxhelp /root

root@linuxhelp:~# ls -la linuxhelp 
-rw-r--r-- 1 root root 0 Dec 31 15:10 linuxhelp

root@linuxhelp:~# lxc file push /root/linuxhelp test1/root/

root@linuxhelp:~# lxc exec test1 bash

[root@test1 ~]# ls -la
total 8
dr-xr-x---  2 root root   9 Dec 31 09:42 .
drwxr-xr-x 18 root root  23 Dec 31 09:35 ..
-rw-------  1 root root  26 Dec 31 09:38 .bash_history
-rw-r--r--  1 root root  18 May 11  2019 .bash_logout
-rw-r--r--  1 root root 176 May 11  2019 .bash_profile
-rw-r--r--  1 root root 176 May 11  2019 .bashrc
-rw-r--r--  1 root root 100 May 11  2019 .cshrc
-rw-r--r--  1 root root 129 May 11  2019 .tcshrc
-rw-r--r--  1 root root   0 Dec 31 09:42 linuxhelp