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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To do that, we will create a respond file as below and copy over to OEL so that both servers have same configuration. First, you should make the node as primary for DRBD. Yes, my password is: You can check the status by: Recovering from split-brain In the event of split-brain, you may be able hiwto correct it by performing the following, but do not do this blindly!
I believe that doing what we love is the source of inspiration of doing more. Make sure you understand what this is ddbd before you run it on your production data, otherwise you may lose data you wanted!
How to install and setup DRBD on CentOS
The create-md command must be success then after. On the drbd01or whichever host bowto wish to be the primary, enter the following:.
Note, depending on how much data was written, it may take a bit of time for the volumes to become consistent again. The following example has nothing more than “Hello World” character. It may be easier to install the linux-server package inside the virtual machine. Can I use it for database i.
How to setup DRBD
This will provide the DKMS-based kernel module and userspace tools. I didn’t find a proper way how to setup loop back files during the boot process maybe via udev rules? You must see the drbdtest.
After drbd has been setup at both the nodes and one node is made primary.
Detecting if MySQLdump was running. Do you already have an account? DrBd last modified howyo Powered by Social Snap. Before we start, we need to update the system and install the required packages for the DRBD dependencies. Avoid that at all costs. This can be done only on one of the nodes.
How to install and setup DRBD on CentOS
The replication is transparent to other applications on the host systems. After logging in you can close it and return to this howo. It is recommended to wait until the initial synchronization is complete. Skip to content Home All Posts.
Also, see the drbdadm man page. See the output of lsblk. Hosto two hosts in this example will be called drbd01 and drbd This feature is only available to subscribers. Once done on the first server, do the same steps on server OEL By anyway if the primary system crashes out, we may lose the system files, but the virutal device drbd0 will be available.
Module drbd not found. Always remember the process. Your name or email howo Apart from computer stuffs, I like to travel and feel like traveling is one of the ways to seek myself.
You need to reboot the system and try:. Demote the primary server to the secondary role:. That’s all, now we will create a new disk partition to act as DRDB disk. Finally, prep your block devices, but do not format them with a filesystem! This tutorial explains how to install and setup DRBD for your server.
You can check the status by:. Now, we’ve come to the final part which is testing of the DRBD service to ensure it meets the objective. Notice in above that the DRBD service did start not yet. After this, we will set node1 as secondary and node2 as primary.
Once you’ve successfully mounted the DRBD partition to your new folder, you’ll notice that the file that you’ve created in server OEL before automatically existed! Any block device hard disks, partitions, RAID devices, logical volumes, etc can be mirrored. Hosting provided by Metropolitan Area Network Darmstadt. I opted to go with 10M for this article. Recovering from split-brain Test 1: