Getting High With Lenny - Page 3
LVM will normally scan all available devices under /dev, but since /dev/cciss/c0d0p6 and /dev/drbd0 are basically the same this will lead to errors where LVM reads and writes the same data to both devices. So to limit it to scan /dev/drbd devices only we do the following on both nodes.
cp /etc/lvm/lvm.conf /etc/lvm/lvm.conf.original
#filter = [ "a/.*/" ] filter = [ "a|/dev/drbd|", "r|.*|" ]
To re-scan with the new settings on both nodes:
Create the Physical Volume
The following only needs to be done on the node that is the primary!!, the second node will copy this automatically. On node1:
Create the Volume Group
vgcreate drbdvg0 /dev/drbd0
Create the Logical Volume
In this example about 50GB, this leaves plenty of space to expand the volumes or to add extra volumes later on. For this example we will make a Vserver called "web" so I will name the Logical Volume it will be placed on the same. On node1:
lvcreate -L50000 -n web drbdvg0
Then we put a file system on the logical volume.
Create the directory where we want to mount the Vservers, the big data partition is mounted on /VSERVERS in this example.
mkdir -p /VSERVERS/web
Mount the volume group to the mount point:
mount -t ext3 /dev/drbdvg0/web /VSERVERS/web/
Of course we want to be informed by heartbeat in case a node goes down, so we install postfix on both machines to send the mail...
apt-get install postfix mailx... and go for the defaults, "internet site" and "node1.example.com". We don't want postfix to listen to all interfaces,
and change the line at the bottom to read like this:
inet_interfaces = loopback-only