[UX]-Using-LXD-containers-for-Oniro-testing.md

+## Description
+Using LXD Containers to simple & quick create virtualhosts for Oniro testing.
+
+LXD solution is lightweight and does not burden your system like classic virtual machine.
+
+Unlike to Docker it can be usable as full working virtual system in container.
+
+## Intruction
+1. Installation and setup of LXD  
+``` bash
+sudo snap install lxd
+lxd init # setup size of storage, 120GB is recomended for building tests
+# Size in GB of the new loop device (1GB minimum) [default=30GB]: 120
+# Keep default values for others settings
+```
+
+2. Edit LXC Profile to implement settings
+``` bash
+lxc profile copy default onirotest-profile
+lxc profile edit onirotest-profile
+```
+3. Insert settings below to lxc profile
+``` bash
+config:
+  user.user-data: |
+    #cloud-config
+    npackage_upgrade: true
+    npackages:
+      - htop
+      - gawk
+      - wget
+      - git
+      - diffstat
+      - unzip
+      - texinfo
+      - gcc-multilib
+      - build-essential.
+      - chrpath.
+      - socat.
+      - cpio.
+      - python3.
+      - python3-pip
+      - python3-pexpect
+      - xz-utils.
+      - debianutils.
+      - iputils-ping.
+      - python3-git.
+      - python3-jinja2.
+      - libegl1-mesa.
+      - libsdl1.2-dev
+      - pylint3
+      - xterm..
+      - file.
+      - zstd
+    users:
+      - default
+      - onirotest
+    system_info:
+      default_user:
+        name: onirotest
+        plain_text_passwd: 'onirotest'
+        home: /home/onirotest
+        shell: /bin/bash
+        lock_passwd: True
+        gecos: Ubuntu
+        groups: [plugdev, dip, netdev, root, sudo]
+```
+Settings description
+- initialize cloud-config to implement settings
+- preinstalled all required host packages from docs (https://docs.oniroproject.org/en/latest/oniro/oniro-quick-build.html#prerequisites)
+- auto update packages
+- create user 'onirotest'
+- adding groups
+
+
+4. Profile configuration file should looks something like this:
+``` yaml
+config:
+  user.user-data: "#cloud-config\npackage_upgrade: true\npackages:\n  - htop\n  -
+    gawk \n  - wget \n  - git \n  - diffstat \n  - unzip \n  - texinfo \n  - gcc-multilib\n
+    \ - build-essential \n  - chrpath \n  - socat \n  - cpio \n  - python3 \n  - python3-pip
+    \n  - python3-pexpect\n  - xz-utils \n  - debianutils \n  - iputils-ping \n  -
+    python3-git \n  - python3-jinja2 \n  - libegl1-mesa \n  - libsdl1.2-dev\n  - pylint3
+    \n  - xterm \n  - file \n  - zstd\nusers:\n  - default\n  - onirotest\nsystem_info:\n
+    \ default_user:\n    name: onirotest\n    plain_text_passwd: 'onirotest'\n    home:
+    /home/onirotest\n    shell: /bin/bash\n    lock_passwd: True\n    gecos: Ubuntu\n
+    \   groups: [plugdev, dip, netdev, root, sudo]\n"
+description: Default LXD profile
+devices:
+  eth0:
+    name: eth0
+    network: lxdbr0
+    type: nic
+  root:
+    path: /
+    pool: default
+    type: disk
+name: onirotest-profile
+used_by: []
+```
+
+
+
+5. Create & run virtual host Ubuntu 20.04 with 'onirotest-profile' settings
+
+``` bash
+lxc launch ubuntu:20.04 virtualhost -p onirotest-profile
+lxc exec virtualhost -- sudo --login --user onirotest
+#use `exit` to exit
+```
+
+Now you can use new virtualhost to testing any things.
+
+You can also simple create new containers using `lxc launch ubuntu:20.04 name_of_your_new_container -p onirotest-profile` or continue work in previous container.
+
+to check runnig containers please use `lxc list`
+``` bash
+➜  ~ lxc list
++-------------+---------+-----------------------+-----------------------------------------------+-----------+-----------+
+|    NAME     |  STATE  |         IPV4          |                     IPV6                      |   TYPE    | SNAPSHOTS |
++-------------+---------+-----------------------+-----------------------------------------------+-----------+-----------+
+| virtualhost | RUNNING | 10.123.242.161 (eth0) | fd42:1228:da87:1497:216:3eff:feab:a0f7 (eth0) | CONTAINER | 0         |
++-------------+---------+-----------------------+-----------------------------------------------+-----------+-----------+
+```
+
+for more please visit: https://linuxcontainers.org/lxd/advanced-guide/
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