Difference between revisions of "Ubuntu 14.04 and LXC containers"

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(LXC container creation)
 
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Ubuntu releases after 10.04 LTS do no longer provide unfs3. Unfs3 is useful when one want to setup a fog server in a container with OpenVZ or LXC. Nfs kernel server cannot run in these containers.
 
Ubuntu releases after 10.04 LTS do no longer provide unfs3. Unfs3 is useful when one want to setup a fog server in a container with OpenVZ or LXC. Nfs kernel server cannot run in these containers.
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Here's how to setup a FOG server in a LXC container.
  
 
= Prerequisites =
 
= Prerequisites =
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Setup a bridge on the computer, with at least one ethernet interface attached to it.
 
Setup a bridge on the computer, with at least one ethernet interface attached to it.
  
apt-get install bridgeutils
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apt-get install bridge-utils
  
 
edit the file '''/etc/network/interfaces''' and add the following lines. '''Please ensure you're not using a SSH session''', because you may lose your connection !
 
edit the file '''/etc/network/interfaces''' and add the following lines. '''Please ensure you're not using a SSH session''', because you may lose your connection !
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   lxc-start -n server-fog -F
 
   lxc-start -n server-fog -F
  
login with the login and password given earlier, and '''change the password''' ! If needed, you have to shutdown the container to go back to the host's console
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login with the credentials given earlier, and '''change the password''' ! If needed, you have to shutdown the container to go back to the host's console
  
 
   sudo init 0
 
   sudo init 0

Latest revision as of 08:02, 1 March 2015

Ubuntu releases after 10.04 LTS do no longer provide unfs3. Unfs3 is useful when one want to setup a fog server in a container with OpenVZ or LXC. Nfs kernel server cannot run in these containers.

Here's how to setup a FOG server in a LXC container.

Prerequisites

  • A computer (physical or virtual) running Ubuntu 14.04 Server, may or may not using LVM, with available space in at least one volume group

Network setup on the LXC host

Setup a bridge on the computer, with at least one ethernet interface attached to it.

apt-get install bridge-utils

edit the file /etc/network/interfaces and add the following lines. Please ensure you're not using a SSH session, because you may lose your connection !

Add the following lines : auto br0 iface br0 inet static address 192.168.1.2 netmask 255.255.255.0 gateway 192.168.1.1 bridge_ports eth0 bridge_fd 0 bridge_maxwait 0

Reboot the computer and check network connectivity

LXC container creation

First, create a LXC container running Ubuntu. The version is the latest LTS version available at the moment of creating the container

 lxc-create -n server-fog -t ubuntu -B lvm --vgname vg --lvname lv-server-fog --fssize=10G --fstype=ext4

This will create a logical volume lv-server-fog in the volume group vg0, with a 10GB ext4 filesystem. The container wil be named server-fog. At the end of the process, the system will give you a login and a password.

Edit the file /var/lib/lxc/server-fog/config and setup networking for the container :

 lxc.network.link = br0
 lxc.network.ipv4 = 192.168.1.3
 lxc.network.gateway = 192.168.1.1

start your container

 lxc-start -n server-fog -F

login with the credentials given earlier, and change the password ! If needed, you have to shutdown the container to go back to the host's console

 sudo init 0

To run the container non interactively, use the following command

 lxc-start -d -n server-fog

To use a terminal in the container :

 lxc-console -n server-fog

You may exit the container at any time using the following keys (do not forget to logout first, because this will NOT logout any user in the container) :

 CTRL+A, Q

In the container you have to download, compile and install unfs3 from sources.

  • Download unfs3
  • decompress the archive : tar zxf unfs3-0.9.22.tar.gz
  • apt-get install build-essential make flex bison
  • cd unfs3-0.9.22
  • ./configure
  • make
  • make install
  • make install-init
  • edit /etc/init.d/unfsd and replace the occurence of /usr/sbin/unfsd with /usr/local/sbin/unfsd
  • /etc/init.d/unfsd start
  • check unfsd is running : ps -ef | grep unfsd
  • if it runs, then run update-rc.d unfsd defaults

Install and configure fog as usual.

If you want to setup a separate volume for your images :

  • assuming you want to use a logical volume (LVM) /dev/vg0/lv with a ext3 filesystem :
  • run your container and move all files located in /images into an other location (/root/images-bak), including the hidden file /images/.mntcheck
  • from the lxc host, open /var/lib/your-container/fstab and add the following line : /dev/vg0/lv images ext3 defaults 0 0
  • restart the container, and check the nex volume is available : run mount without any argument.
  • If the LVM volume has been successfully mounted, move back the files backed up in /root/images-bak. Note there is no slash before images.
  • chmod 777 /images

Once your setup is up and running, do not forget to enable autostart of your container :

edit /var/lib/lxc/server-fog/config :

 lxc.start.auto = 1