Instalare si configurare LXD

Postat la Sun 22 April 2018 in tutoriale, lxd, lxc

Documentatia LXD recomanda folosirea ca sistem de stocare pentru containere/VM ZFS ca sistem de fisiere care permite:

  • crearea rapida de partitii ca dataseturi
  • optiuni de backup si restaurare rapida
  • putem monta o partitie ca share in mai multe containere

Mai multe gasiit aici: http://zfsonlinux.org/

Dupa ce am ales masina potrivita vom face o instalare simpla de Ubuntu 18.04 server (beta 2 in acest moment) pe care vom instala serviciul de ssh pentru conectare remote.

Cum am partiionat discurile, in varianta mea am folosind 2 HDD de 250Gb:

  • /dev/sda1 - 250M - /boot
  • /dev/sda2 - 8G - swap
  • /dev/sda3 - 100G - /
  • /dev/sda4 - restul discului pe care nu am format la instalare
  • /dev/sdb - nepartitionat

Dupa instalare am creat un bridge la care am adaugat interfatza enp9s0 folosind utilitarul netplan.

Am editat fisierul /etc/netplan/01-netcfg.yaml

network:
  version: 2
  renderer: networkd
  ethernets:
    enp9s0:
      dhcp4: false
      dhcp6: false
  bridges:
    br0:
      interfaces:
        - enp9s0
      dhcp4: false
      addresses: [ 192.168.25.200/24 ]
      gateway4: 192.168.25.1
      nameservers:
        addresses: [ 1.1.1.1,8.8.8.8 ]

si am aplicat configuratia cu comanda

netplan apply

iar configuratia a devenit:

2: enp9s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br0 state UP group default qlen 1000
    link/ether 00:30:05:a1:c7:63 brd ff:ff:ff:ff:ff:ff
3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 32:f0:1b:7c:b1:e0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.25.200/24 brd 192.168.25.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::30f0:1bff:fe7c:b1e0/64 scope link
       valid_lft forever preferred_lft forever

Pachetul lxd vine preinstalat in Ubuntu 18.04 server la versiunea 3.0. Asa ca mai avem nevoie de utilitarele pentru ZFS

apt install zfsutils-linux

Pentru ca doream ZFS pe mai multe discuri am creat manual pool-ul, pe partitiile /dev/sda4 si /dev/sdb:

zpool create lxd001 /dev/sda4 /dev/sdb

Verificam configuratia ZFS:

~ zpool status
  pool: lxd001
 state: ONLINE
  scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        lxd001      ONLINE       0     0     0
          sda4      ONLINE       0     0     0
          sdb       ONLINE       0     0     0

errors: No known data errors

Mai multe despre configurare sistemului de fisiere ZFS gasiti in documentatia Oracle aici.

Automat pool-ul ZFS este montat in /lxd001 si pentru pasul urmator acesta trebuie sa fie demontat:

zfs umount lxd001

Acum putem initializa lxd

~ lxd init
Would you like to use LXD clustering? (yes/no) [default=no]:
Do you want to configure a new storage pool? (yes/no) [default=yes]:
Name of the new storage pool [default=default]: lxd001
Name of the storage backend to use (btrfs, dir, lvm, zfs) [default=zfs]:
Create a new ZFS pool? (yes/no) [default=yes]: no
Name of the existing ZFS pool or dataset: lxd001
Would you like to connect to a MAAS server? (yes/no) [default=no]:
Would you like to configure LXD to use an existing bridge or host interface? (yes/no) [default=no]: yes
Name of the existing bridge or host interface: br0
Would you like LXD to be available over the network? (yes/no) [default=no]:
Would you like stale cached images to be updated automatically? (yes/no) [default=yes]
Would you like a YAML "lxd init" preseed to be printed? (yes/no) [default=no]: yes
config: {}
cluster: null
networks:
  description: ""
  managed: false
  name: br0
  type: "bridge"
storage_pools:
- config:
    source: lxd001
  description: ""
  name: lxd001
  driver: zfs
profiles:
- config: {}
  description: ""
  devices:
    eth0:
      name: eth0
      nictype: bridged
      parent: br0
      type: nic
    root:
      path: /
      pool: lxd001
      type: disk
  name: default

Alternativa recomandata pentru storage este btrfs, dar se poate folosi si LVM , folder normal (dar mai lent). Mai multe gasiti in documentatie.

Completare: LXD se poate instala si pe CentOS 7 cum este descris in acest artico

Articolul face parte din seria Virtualizare cu LXD

lxd virtualizare lxc