Ubuntu 14.04 and LXC 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 under these containers.

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