DRBD: Difference between revisions

DRBD (Distributed Replicated Block Device) is a virtual block device that is distributed across two or more machines.

Installation

On a clean installation of RHEL 7 or equivalent, run updates, and ensure that you have NTP and a recent kernel installed.

From ElRepo

Get the DRBD packages from ELRepo:

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
yum install drbd84-utils kmod-drbd84

From Source

Install prerequisites:

yum install gcc flex make autoconf m4

Get the source from their git repository. Releases from tarballs may fail depending on which kernel version you're using.

git clone git://git.drbd.org/drbd-8.4.git
cd drbd-8.4
make
make install

The make install should have loaded the module and you can verify this:

lsmod | grep drbd

If it isn't loaded, load it using modprobe

modprobe drbd

Compile the userspace utilities:

git clone git://git.drbd.org/drbd-utils.git
cd drbd-utils
./aclocal.sh
./configure --prefix=/usr --localstatedir=/var --sysconfdir=/etc
make
make install

Note: I got errors about man pages not being found. Ugh.

Configuration

This section will configure DRBD for use in a redundant MySQL setup.

DRBD syncs volumes. If you did not configure a partition or have a separate disk to mirror, you can create a file volume instead.

mkdir /var/drbd
cd /var/drbd

# Create a 50GB volume
dd if=/dev/zero of=data_volume.dat bs=1024 count=52428800

# Create a partition
fdisk data_volume.dat

# Create a device
losetup /dev/loop0 /var/drbd/data_volume.dat

mkdir -p /mnt/drbd
echo "/dev/drbd0 /mnt/drbd ext4 noauto 0 0 " >>  /etc/fstab

Configure the DRBD config in /etc/drbd.d/*conf. You may want to disable the survey. Configure DRBD by creating a file in /etc/drbd.d/mysql.res resource mysql { disk { on-io-error detach; }

device /dev/drbd0; disk /dev/loop0; meta-disk internal;

on node1 { address 172.20.10.10:7700; }

on node2 { address 172.20.10.9:7700; } } </syntaxhighlight>

If you get an error like:

'mysql' not defined in your config (for this host).

You are probably doing something wrong.

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DRBD: Difference between revisions

Revision as of 19:57, 31 March 2015

Installation

From ElRepo

From Source

Configuration

See Also

Contents

Recent Changes

Recent Changes under Linux

Recent Changes under Guides

Ad-Free + Tracker-Free

Contents

@@ Line 57: / Line 57: @@
   echo "/dev/drbd0 /mnt/drbd ext4 noauto 0 0 " >>  /etc/fstab
+Configure the DRBD config in /etc/drbd.d/*conf. You may want to disable the survey.
 Configure DRBD by creating a file in /etc/drbd.d/mysql.res
-<syntaxhighlight lang="text">
 resource mysql {
-  device    "/dev/brdb0";
+	disk {
-  disk      "/dev/loop0";
+		on-io-error detach;
-  meta-disk internal;
+	}
-  on node1 {
-    address ipv4 10.0.42.100:7700;
+	device    /dev/drbd0;
-  }
+	disk      /dev/loop0;
-  on node2 {
+	meta-disk internal;
-    address ipv4 10.0.42.254:7700;
-  }
+	on node1 {
+		address 172.20.10.10:7700;
+	}
+	on node2 {
+		address 172.20.10.9:7700;
+	}
 }
 </syntaxhighlight>
+If you get an error like:
+ 'mysql' not defined in your config (for this host).
+You are probably doing something wrong.
 == See Also ==