This post explains you about the DRBD (Distributed Replicated Block Device) to understand What is DRBD (Distributed Replicated Block. Distributed Replicated Block Device (DRBD) mirrors block devices between multiple hosts. The replication is transparent to other applications on the host. This step-by-step tutorial demonstrates how to install Distributed Replicated Block Device (DRBD) on CentOS Linux.

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See the output of lsblk.

HowTos/Ha-Drbd – CentOS Wiki

Private network between the servers 4. Below are the steps: Power back on the secondary node drbd02, and watch the system sync back up.

Once the dependency package installation has finished on both servers, we will start to install the DRBD packages. For information on contributing see the Ubuntu Documentation Team wiki page. You have successfully implememted DRBD at your system.

Do howyo already have an account? We now work only on drbd0 device. Now we’ve coming to final step which is the configuration of DRBD.

What is DRBD, How DRBD works – DRBD Tutorial for Beginners

Skip to content Home All Posts. Any block device hard disks, partitions, RAID devices, logical volumes, etc can be mirrored. After drbd has been setup at both the nodes and drbc node is made primary. The login page will open in a new window.


Those systems are defined as Primary node and Secondary node can switch Primary and Secndary nodes. Please share it and help us grow: This is done by: Know what they do before you run them in production since they can cause problems if your not ready dbrd it! Also, see the drbdadm man page. The create-md command must be success then after. To watch the progress, on drbd02 enter the following:.

Powered by Social Snap. You can’t mount resource in node1. Once this is done, the disks will begin to sync up. To see what happens when the secondary server goes offline: This tests what happens when primary node goes offline, and someone promotes the secondary node before the primary comes online and can be demoted split-brain. On this page 1. Detecting if MySQLdump was running. Now on the secondary server promote it to the primary role:.

Since drbd0 can only be mounted on Primary node,the contents are only accessed from primary node at a time.

How to install and setup DRBD on CentOS

Basically, we need to set which partition disk and server should act under the DRBD module. This goes without saying, but do not experiment with these scenarios on your production environment!


Recovering from split-brain Test 1: The material in this document is available under a free license, see Legal for details. Once done, we need to initialize the partition on both servers. Testing primary node gowto This tests what happens when primary node goes ddbd, and someone promotes the secondary node before the primary comes online and can be demoted split-brain.

Hosting provided by Metropolitan Area Network Darmstadt. The replication is transparent to other applications on the host systems. Apart from computer stuffs, I like to travel and feel like traveling is one of the ways to seek myself.

Below are the commands that need to be run and the list of packages that get updated or installed. Hoqto boot drbd01 again and enjoy the split-brain scenario! Log in or Sign up. Note, depending on how much data was written, it may take a bit of time for the volumes to become consistent again. Module drbd not found.