LXC - Linux Containers

2014-01-11

• <參考> ​Creating a virtualized fully-distributed Hadoop cluster using Linux Containers
• 測試環境：Debian Wheezy 7.1 netinstall ISO with ​preseed

  jazz@debian:~$ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Debian
  Description:	Debian GNU/Linux 7.3 (wheezy)
  Release:	7.3
  Codename:	wheezy
  

• 安裝 LXC

  jazz@debian:~$ sudo apt-get install lxc
  

• 產生虛擬機器

  jazz@debian:~$ sudo lxc-create -t debian -n test1
  jazz@debian:~$ sudo lxc-start -d -n test1
  

• 安裝 LXC Web Panel

  root@debian:~# wget http://lxc-webpanel.github.io/tools/install.sh -O - | bash
  

• <狀況> 指令可以建立 LXC VM, 但網頁似乎不太靈光。

2014-01-12

• 測試環境：Ubuntu 12.04 LTS

  jazz@jazzbook:~$ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 12.04.2 LTS
  Release:	12.04
  Codename:	precise
  

• 感覺上 LXC 1.0 的功能比較齊全(Ex. 支援根據 DNS 分配 IP 的機制)，因此直接採用 precise-backports 套件庫中的 lxc 1.0 版本

  echo "deb http://free.nchc.org.tw/ubuntu precise-backports main universe" > /tmp/precise-backport.list
  sudo mv /tmp/precise-backport.list /etc/apt/sources.list.d/
  sudo apt-get update
  

• 安裝 LXC 1.0 版本

  sudo apt-get install lxc
  

  jazz@jazzbook:~$ lxc-version 
  lxc version: 1.0.0.alpha1
  

• 根據 /etc/default/lxc-net 的說明，可以設定一個檔案，來根據 hostname 決定 IP 分配

  # Uncomment the next line if you'd like to use a conf-file for the lxcbr0
  # dnsmasq.  For instance, you can use 'dhcp-host=mail1,10.0.3.100' to have
  # container 'mail1' always get ip address 10.0.3.100.
  #LXC_DHCP_CONFILE=/etc/lxc/dnsmasq.conf
  

  root@jazzbook:~# echo "LXC_DHCP_CONFILE=/etc/lxc/dnsmasq.conf" >> /etc/default/lxc-net
  root@jazzbook:~# cat > /etc/lxc/dnsmasq.conf << EOF
  dhcp-host=hdp11,10.0.1.111
  dhcp-host=hdp12,10.0.1.112
  dhcp-host=hdp13,10.0.1.113
  dhcp-host=hdp14,10.0.1.114
  dhcp-host=hdp15,10.0.1.115
  dhcp-host=hdp16,10.0.1.116
  dhcp-host=hdp17,10.0.1.117
  dhcp-host=hdp18,10.0.1.118
  dhcp-host=hdp19,10.0.1.119
  dhcp-host=hdp21,10.0.1.121
  dhcp-host=hdp22,10.0.1.122
  dhcp-host=hdp23,10.0.1.123
  dhcp-host=hdp24,10.0.1.124
  dhcp-host=hdp25,10.0.1.125
  dhcp-host=hdp26,10.0.1.126
  dhcp-host=hdp27,10.0.1.127
  dhcp-host=hdp28,10.0.1.128
  dhcp-host=hdp29,10.0.1.129
  EOF
  

• 建立 20 個 VM 的主機名稱對應(hostname)

  root@jazzbook:~# cat >> /etc/hosts << EOF
  # for LXC
  10.0.1.111	hdp11
  10.0.1.112      hdp12
  10.0.1.113      hdp13
  10.0.1.114      hdp14
  10.0.1.115      hdp15
  10.0.1.116      hdp16
  10.0.1.117      hdp17
  10.0.1.118      hdp18
  10.0.1.119      hdp19
  10.0.1.121      hdp21
  10.0.1.122      hdp22
  10.0.1.123      hdp23
  10.0.1.124      hdp24
  10.0.1.125      hdp25
  10.0.1.126      hdp26
  10.0.1.127      hdp27
  10.0.1.128      hdp28
  10.0.1.129      hdp29
  EOF
  

• 先建立五個 LXC VM 試試看

  root@jazzbook:~# for ((i=11;i<=15;i++)); do lxc-create -t ubuntu -n hdp$i; done
  
  Checking cache download in /var/cache/lxc/precise/rootfs-i386 ... 
  Copy /var/cache/lxc/precise/rootfs-i386 to /usr/lib/i386-linux-gnu/lxc ... 
  Copying rootfs to /usr/lib/i386-linux-gnu/lxc ...
  /bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
  Generating locales...
    en_US.UTF-8... done
  Generation complete.
  Creating SSH2 RSA key; this may take some time ...
  Creating SSH2 DSA key; this may take some time ...
  Creating SSH2 ECDSA key; this may take some time ...
  
  ##
  # The default user is 'ubuntu' with password 'ubuntu'!
  # Use the 'sudo' command to run tasks as root in the container.
  ##
  

• 從以上訊息可以得知，預設的帳號密碼都是 ubuntu
• 啟動 5 個 LXC VM

  root@jazzbook:~# for ((i=11;i<=15;i++)); do lxc-start -d -n hdp$i; done
  

• 安裝 LXC Web Panel

  jazz@jazzbook:~$ sudo su -
  root@jazzbook:~# wget http://lxc-webpanel.github.io/tools/install.sh -O - | bash