Striping Across Four Storage Nodes With GlusterFS On Debian Lenny - Page 2

3 Configurazione del Client GlusterFS

client1.example.com:

Sul client, dobbiamo installare fuse e GlusterFS. Invece di installare il pacchetto libfuse2 dal repository Debian, installiamo una versione patchata con un supporto migliore per GlusterFS.

Prima installiamo di nuovo i prerequisiti:

aptitude install sshfs build-essential flex bison byacc libdb4.6 libdb4.6-dev

Poi costruiamo fuse come segue (puoi trovare l’ultima versione patchata di fuse su ftp://ftp.zresearch.com/pub/gluster/glusterfs/fuse/):

cd /tmp  
wget ftp://ftp.zresearch.com/pub/gluster/glusterfs/fuse/fuse-2.7.4glfs11.tar.gz  
tar -zxvf fuse-2.7.4glfs11.tar.gz  
cd fuse-2.7.4glfs11  
./configure  
make && make install

Dopo costruiamo GlusterFS (proprio come sul server)…

cd /tmp  
wget http://ftp.gluster.com/pub/gluster/glusterfs/2.0/LATEST/glusterfs-2.0.1.tar.gz  
tar xvfz glusterfs-2.0.1.tar.gz  
cd glusterfs-2.0.1  
./configure --prefix=/usr > /dev/null

make && make install  
ldconfig  
glusterfs --version

… e creiamo le seguenti due directory:

mkdir /mnt/glusterfs  
mkdir /etc/glusterfs

Successivamente creiamo il file /etc/glusterfs/glusterfs.vol:

vi /etc/glusterfs/glusterfs.vol

| volume remote1 type protocol/client option transport-type tcp/client option remote-host server1.example.com option remote-subvolume brick end-volume volume remote2 type protocol/client option transport-type tcp/client option remote-host server2.example.com option remote-subvolume brick end-volume volume remote3 type protocol/client option transport-type tcp/client option remote-host server3.example.com option remote-subvolume brick end-volume volume remote4 type protocol/client option transport-type tcp/client option remote-host server4.example.com option remote-subvolume brick end-volume volume stripe type cluster/stripe option block-size 1MB subvolumes remote1 remote2 remote3 remote4 end-volume volume writebehind type performance/write-behind option window-size 1MB subvolumes stripe end-volume volume cache type performance/io-cache option cache-size 512MB subvolumes writebehind end-volume |

Assicurati di utilizzare i nomi host o gli indirizzi IP corretti nei parametri remote-host!

Ecco fatto! Ora possiamo montare il filesystem GlusterFS su /mnt/glusterfs con uno dei seguenti due comandi:

glusterfs -f /etc/glusterfs/glusterfs.vol /mnt/glusterfs

oppure

mount -t glusterfs /etc/glusterfs/glusterfs.vol /mnt/glusterfs

Ora dovresti vedere la nuova condivisione negli output di…

mount

client1:~# mount  
/dev/sda1 on / type ext3 (rw,errors=remount-ro)  
tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)  
proc on /proc type proc (rw,noexec,nosuid,nodev)  
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)  
odev on /dev type tmpfs (rw,mode=0755)  
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)  
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)  
fusectl on /sys/fs/fuse/connections type fusectl (rw)  
/etc/glusterfs/glusterfs.vol on /mnt/glusterfs type fuse.glusterfs (rw,max_read=131072,allow_other,default_permissions)  
client1:~#

… e…

df -h

client1:~# df -h  
Filesystem            Size  Used Avail Use% Mounted on  
/dev/sda1             29G  896M   27G   4% /  
tmpfs                 126M     0  126M   0% /lib/init/rw  
udev                  10M   80K   10M   1% /dev  
tmpfs                 126M     0  126M   0% /dev/shm  
/etc/glusterfs/glusterfs.vol  
                     105G  3.4G   96G   4% /mnt/glusterfs  
client1:~#

( server1.example.com, server2.example.com, server3.example.com e server4.example.com hanno ciascuno circa 26GB di spazio per il filesystem GlusterFS, in modo che la condivisione risultante abbia una dimensione di circa 4 x 26GB (105GB).)

Invece di montare manualmente la condivisione GlusterFS sul client, potresti modificare /etc/fstab in modo che la condivisione venga montata automaticamente all’avvio del client.

Apri /etc/fstab e aggiungi la seguente riga:

vi /etc/fstab

| [...] /etc/glusterfs/glusterfs.vol /mnt/glusterfs glusterfs defaults 0 0 |

Per testare se la tua modifica a /etc/fstab funziona, riavvia il client:

reboot

Dopo il riavvio, dovresti trovare la condivisione negli output di…

df -h

… e…

mount

4 Test

Ora creiamo un grande file di test sulla condivisione GlusterFS:

client1.example.com:

dd if=/dev/zero of=/mnt/glusterfs/test.img bs=1024k count=1000

ls -l /mnt/glusterfs

client1:~# ls -l /mnt/glusterfs  
total 1028032  
-rw-r--r-- 1 root root 1048576000 2009-06-03 20:51 test.img  
client1:~#

Ora controlliamo la directory /data/export su server1.example.com, server2.example.com, server3.example.com e server4.example.com. Dovresti vedere il file test.img su ciascun nodo, ma con dimensioni diverse (a causa dello striping dei dati):

server1.example.com:

ls -l /data/export

server1:~# ls -l /data/export  
total 257008  
-rw-r--r-- 1 root root 1045430272 2009-06-03 20:51 test.img  
server1:~#

server2.example.com:

ls -l /data/export

server2:~# ls -l /data/export  
total 257008  
-rw-r--r-- 1 root root 1046478848 2009-06-03 20:55 test.img  
server2:~#

server3.example.com:

ls -l /data/export

server3:~# ls -l /data/export  
total 257008  
-rw-r--r-- 1 root root 1047527424 2009-06-03 20:54 test.img  
server3:~#

server4.example.com:

ls -l /data/export

server4:~# ls -l /data/export  
total 257008  
-rw-r--r-- 1 root root 1048576000 2009-06-03 20:02 test.img  
server4:~#

5 Link

• GlusterFS: http://www.gluster.org/
• Debian: http://www.debian.org/