LXD
Instal·lació
sudo apt-get install lxd newgrp lxd
En ubuntu, els usuaris han de formar part del grup LXD per poder utilitzar-lo.
Observem que passa si fem lxc sense paràmetres:
$ lxc Usage: lxc [subcommand] [options] Órdenes disponibles config - Manage configuration. copy - Copy containers within or in between lxd instances. delete - Delete containers or container snapshots. exec - Execute the specified command in a container. file - Manage files on a container. help - Presents details on how to use LXD. image - Manipulate container images. info - List information on LXD servers and containers. launch - Launch a container from a particular image. list - Lists the available resources. move - Move containers within or in between lxd instances. profile - Manage configuration profiles. publish - Publish containers as images. remote - Manage remote LXD servers. restart - Changes state of one or more containers to restart. restore - Set the current state of a resource back to a snapshot. snapshot - Create a read-only snapshot of a container. start - Changes state of one or more containers to start. stop - Changes state of one or more containers to stop. version - Prints the version number of this client tool. Opciones: --all Print less common commands. --debug Print debug information. --verbose Print verbose information. Entorno: LXD_CONF Path to an alternate client configuration directory. LXD_DIR Path to an alternate server directory.
Contenidors i imatges
Si fem:
$ lxc image list Generating a client certificate. This may take a minute... If this is your first time using LXD, you should also run: sudo lxd init To start your first container, try: lxc launch ubuntu:16.04 +-------+-------------+--------+--------------+-----+---------+-------------+ | ALIAS | FINGERPRINT | PUBLIC | DESCRIPCIÓN | ARQ | TAMAÑO | UPLOAD DATE | +-------+-------------+--------+--------------+-----+---------+-------------+
Encara no tenim descarregada ninguna imatge, però ens dona l'opció de configurar en lxd init i de llançar un contenidor en lxc launch ubuntu:16.04.
jose@server:~$ lxc launch ubuntu:16.04 Creando sandless-yair Retrieving image: 100% Iniciando sandless-yair jose@server:~$ lxc list +---------------+---------+------+------+------------+-----------+ | NOMBRE | ESTADO | IPV4 | IPV6 | TIPO | SNAPSHOTS | +---------------+---------+------+------+------------+-----------+ | sandless-yair | RUNNING | | | PERSISTENT | 0 | +---------------+---------+------+------+------------+-----------+ jose@server:~$ lxc image list +-------+--------------+--------+---------------------------------------------+--------+----------+------------------------------+ | ALIAS | FINGERPRINT | PUBLIC | DESCRIPCIÓN | ARQ | TAMAÑO | UPLOAD DATE | +-------+--------------+--------+---------------------------------------------+--------+----------+------------------------------+ | | de051f59f701 | no | ubuntu 16.04 LTS amd64 (release) (20161011) | x86_64 | 143.12MB | Oct 14, 2016 at 9:43am (UTC) | +-------+--------------+--------+---------------------------------------------+--------+----------+------------------------------+
Mirem cóm ha descarregat la imatge, ha creat el contenidor i la imatge està disponible ja en el sistema.
Backend
LXD pot anar directament al sistema d'arxius en /var/lib/lxd. No obstant, és més interessant utilitzar ZFS per els avantatges que proporciona.
Ús dels contenidors
Llistar contenidors lxc list Llançar un contenidor nou lxc launch <imagen> [nombre] Detindre un contenidor lxc stop <nombre> Encendre un contenidor lxc start <nombre> Obtindre un shell en un contenidor lxc exec <nombre> -- /bin/bash Borrar un contenidor o snapshot lxc delete <nombre>