This guide walks you through installing and configuring DRBD and keepalived on two Linux nodes to achieve real‑time block‑level file synchronization, automatic primary/secondary role switching, and high‑availability failover for services such as PostgreSQL, including troubleshooting common issues like split‑brain and busy mounts.
This article explains why most companies suffer long recovery times after data loss, introduces DRBD's real‑time block replication as a solution, and provides detailed architecture designs, deployment steps, monitoring scripts, performance tuning, cost analysis, common pitfalls, and future trends for reliable disaster recovery.
Learn step-by-step how to install and configure DRBD for real-time block device replication, set up keepalived for virtual IP failover, and manage primary/secondary roles, including troubleshooting split-brain, to achieve seamless file synchronization and high availability between two Linux servers.
This article explains the concepts of high availability, continuous recovery, and standby databases, then reviews various PostgreSQL clustering options such as DRBD, ClusterControl, Rubyrep, Pgpool‑II, Bucardo, Postgres‑XC, Citus, and PostgresXL, highlighting their features, advantages, and drawbacks.
This guide details a step‑by‑step setup of a highly available GitLab service using two virtual machines, DRBD for block‑level replication, configuration of GitLab and PostgreSQL directories, DRBD resource creation, service start‑up, and manual primary‑secondary failover procedures.
This article examines common MySQL high‑availability designs—including single master‑slave, dual‑master with multiple slaves, Heartbeat + DRBD, MySQL Cluster, semi‑synchronous replication, and GTID—explaining their benefits, drawbacks, and practical considerations for reliable failover and scalability.
Learn how to set up a fault‑tolerant MySQL environment by installing and configuring Corosync, Pacemaker, DRBD, and related resources across two servers, covering prerequisites, network sync, storage setup, resource definitions, and verification steps to achieve a fully operational HA cluster.
DRBD (Distributed Replicated Block Device) is a software‑based, network‑driven block replication solution that mirrors disks, partitions, or logical volumes across servers in real time, offering synchronous and asynchronous modes, transparent failover, and a middle‑layer between the filesystem and physical storage.
The article outlines a Linux server architecture that mounts a read‑only root filesystem over the network from a centrally managed, DRBD‑replicated control node with Heartbeat failover, providing real‑time updates, high security (even root cannot modify), and automatic migration via virtual IP.
