Config DRBD on Redhat 5.6 32bit VM

 

1 Linux disk configuration

1 The Linux machine should better has second disk, because we don’t want to sync the system partition.

2   The partition DRBD used to sync should have same size.

3 The partition DRBD used must be not mounted arbitrarily, because we need to mount the logical device of DRBD not the physical disk.

2 Build the DRBD

This step will build the RPM package from source code. It requires that the CPP compiler is installed on the machine.

1 Download the source code .tar.gz from http://oss.linbit.com/drbd/ , or if the Linux machine can connect to the internet, use “wget” down the source code “wget http://oss.linbit.com/drbd/8.3/drbd-8.3.10.tar.gz ”,

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[root@rh56 etc]# wget http://oss.linbit.com/drbd/8.3/drbd-8.3.10.tar.gz
--2011-06-22 23:35:39-- http://oss.linbit.com/drbd/8.3/drbd-8.3.10.tar.gz
Resolving oss.linbit.com... 212.69.161.111
Connecting to oss.linbit.com|212.69.161.111|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 521798 (510K) [application/x-gzip]
Saving to: `drbd-8.3.10.tar.gz'

100%[========================================================================================================================================>] 521,798 51.7K/s in 14s

2011-06-22 23:35:56 (35.3 KB/s) - `drbd-8.3.10.tar.gz' saved [521798/521798]

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2 Extract the source package, go to the extraction dir, execute “./configure”.

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[root@rh56 drbd-8.3.10]# ./config
-bash: ./config: No such file or directory
[root@rh56 drbd-8.3.10]# ./config
config.status configure
[root@rh56 drbd-8.3.10]# ./configure
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking whether ln -s works... yes
checking for sed... /bin/sed
checking for grep... /bin/grep
checking for flex... /usr/bin/flex
checking for rpmbuild... /usr/bin/rpmbuild
checking for xsltproc... /usr/bin/xsltproc
checking for tar... /bin/tar
checking for git... no
checking for dpkg-buildpackage... no
checking for udevadm... false
checking for udevinfo... /usr/bin/udevinfo
configure: WARNING: No dpkg-buildpackage found, building Debian packages is disabled.
configure: WARNING: Cannot update buildtag without git. You may safely ignore this warning when building from a tarball.
checking for /etc/gentoo-release... no
checking for /etc/redhat-release... yes
checking for /etc/slackware-version... no
checking for /etc/debian_version... no
checking for /etc/SuSE-release... no
configure: configured for Red Hat (includes Fedora, RHEL, CentOS).
checking for /etc/fedora-release... no
configure: creating ./config.status
config.status: creating Makefile
config.status: creating user/Makefile
config.status: creating scripts/Makefile
config.status: creating documentation/Makefile
config.status: creating user/config.h
config.status: user/config.h is unchanged
[root@rh56 drbd-8.3.10]#

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3 Execute “make rpm” and “make km-rpm” if the configuration is successful.

######################not full log############################

You have now:
/usr/src/redhat/RPMS/i386/drbd-utils-8.3.10-1.i386.rpm
/usr/src/redhat/RPMS/i386/drbd-debuginfo-8.3.10-1.i386.rpm
/usr/src/redhat/RPMS/i386/drbd-bash-completion-8.3.10-1.i386.rpm
/usr/src/redhat/RPMS/i386/drbd-8.3.10-1.i386.rpm
/usr/src/redhat/RPMS/i386/drbd-xen-8.3.10-1.i386.rpm
/usr/src/redhat/RPMS/i386/drbd-heartbeat-8.3.10-1.i386.rpm
/usr/src/redhat/RPMS/i386/drbd-pacemaker-8.3.10-1.i386.rpm
/usr/src/redhat/RPMS/i386/drbd-km-debuginfo-8.3.10-1.i386.rpm
/usr/src/redhat/RPMS/i386/drbd-km-2.6.18_238.el5-8.3.10-1.i386.rpm
/usr/src/redhat/RPMS/i386/drbd-udev-8.3.10-1.i386.rpm
[root@rh56 drbd-8.3.10]#

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4 Go to the /usr/src/redhat/RPMS/i386 dir, execute “rpm –i all” to install all rpm packages.

5 Edit the DRBD configuration file, /etc/drbd.conf to following,

global { usage-count yes; }

common { syncer { rate 100M; } }

resource r0 {

protocol A;

net {

cram-hmac-alg sha1;

shared-secret "cedrdb";

}

on rh56 {

device /dev/drbd1; # the logical device, which DRBD used

disk /dev/sdb1;# the physical disk

address 192.168.70.253:7789;

meta-disk internal;

}

on cerh564 {

device /dev/drbd1;

disk /dev/sdb1;

address 192.168.70.251:7789;

meta-disk internal;

}

}

6 Do the same thing on another machine.

3 Start the DRBD and test

1 Execute “drbdadm create-md r0” to create the resource.

2 Execute “/etc/init.d/drbd start” to start the drbd.

3 “drbdadm -- --overwrite-data-of-peer primary r0” to change the machine to the primary machine.

4 “mount /dev/drbd1 /drbdtest” to mount the DRBD device.

5 Execute “cat /proc/drbd” to overview the status of the DRBD.

6 “drbdadm secondary r0” will change the node to secondary, this command must executed after umount the /dev/drbd1.

7 Make some file to dir /drbdtest on the primary node, then change the secondary node to primary, and mount the /dev/drbd1, you will find the file created on the primary node is on the secondary node already.

8 Note on the first time DRBD start, it will spend some time to sync the whole disk partition.