How to install and configure DRBD on CentOS7 system? Tutorial on implementing high availability and data redundancy!

DRBD (Distributed Replicated Block Device) is an open source solution for achieving data redundancy and high availability. The following is a tutorial for installing and configuring DRBD on CentOS 7 systems:

1. Install DRBD:

   • Open the terminal and log in to the CentOS 7 system as administrator.

   • Run the following command to install the DRBD package:

     sudo yum install drbd

2. Configure DRBD:

   • Edit the DRBD configuration file (usually located in the /etc/drbd.d directory) and configure the DRBD resource settings. For example, you can define the IP addresses, ports, and devices of the primary node and backup node.
   • Ensure that communication between the primary node and the backup node can occur over the network, and that the firewall is configured to allow ports used by DRBD.

   • Run the following command on the master node to initialize DRBD resources:

     sudo drbdadm create-md <resource_name>

   • Run the following command on the backup node to connect to the primary node and start the DRBD service:

     sudo drbdadm connect <resource_name>sudo drbdadm up <resource_name>

3. Set data synchronization:

   • Run the following command on the master node to start data synchronization:

     sudo drbdadm primary <resource_name> --force

   • Run the following command on the backup node to set it as a slave node and start synchronizing data:

     sudo drbdadm secondary <resource_name>

4. Configuring the file system and mounting:

   • Run the following command on the master node to create the file system:

     sudo mkfs.<filesystem_type> /dev/drbd<X>

   • Create a mount point on the primary node, and mount the DRBD device on the primary node and backup node respectively:

     sudo mkdir /mnt/drbd
     sudo mount /dev/drbd<X> /mnt/drbd

Through the above steps, you can install and configure DRBD on CentOS 7 system to achieve high availability and data redundancy. Please note that this is just a basic tutorial and the actual configuration may need to be adjusted based on your specific needs and environment. It is recommended to consult DRBD's official documentation and user guide for more detailed installation and configuration instructions.

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