Glusterfs

orig. Link: http://www.howtoforge.com/high-availability-storage-with-glusterfs-3.2.x-on-ubuntu-11.10-automatic-file-replication-across-two-storage-servers-p2

installieren glusterfs

apt-get install glusterfs-client
mkdir /mnt/glusterfs
mount -t glusterfs server1.example.com:/testvol /mnt/glusterfs
mount

• output sollte so aussehen:

root@client1:~# mount
/dev/mapper/server3-root on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
/dev/sda1 on /boot type ext2 (rw)
server1.example.com:/testvol on /mnt/glusterfs type fuse.glusterfs 
(rw,allow_other,default_permissions,max_read=131072)
root@client1:~#

df -h

root@client1:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/server3-root
                       29G  1.1G   27G   4% /
udev                  238M  4.0K  238M   1% /dev
tmpfs                  99M  212K   99M   1% /run
none                  5.0M     0  5.0M   0% /run/lock
none                  247M     0  247M   0% /run/shm
/dev/sda1             228M   24M  193M  11% /boot
server1.example.com:/testvol
                       29G  1.1G   27G   4% /mnt/glusterfs
root@client1:~# 

• Instead of mounting the GlusterFS share manually on the client, you could modify /etc/fstab,
• so that the share gets mounted automatically when the client boots.
• Open /etc/fstab and append the ollowing line:

vi /etc/fstab 

• das kommt rein:

server1.example.com:/testvol /mnt/glusterfs glusterfs defaults,_netdev 0 0

reboot 
df -h 
mount

some testfiles

touch /mnt/glusterfs/test1
touch /mnt/glusterfs/test2

ls -l /data

server1.example.com:

• Now we shut down server1.example.com and add/delete some files on the GlusterFS share on client1.example.com.

shutdown -h now

client1.example.com:

touch /mnt/glusterfs/test3
touch /mnt/glusterfs/test4
rm -f /mnt/glusterfs/test2

server2.example.com:

• The changes should be visible in the /data directory on server2.example.com

ls -l /data

server1.example.com:

• As you see, server1.example.com hasn't noticed the changes that happened while it was down.
• This is easy to fix, all we need to do is invoke a read command,
• on the GlusterFS share on client1.example.com, e.g.:

ls -l /data

client1.example.com:

• Now take a look at the /data directory on server1.example.com again,
• and you should see that the changes have been replicated to that node:

ls -l /mnt/glusterfs/

server1.example.com:

• ls -l /data