Storage Cluster with DRBD and GlusterFS

Two storage servers will use DRBD to replicate data and GlusterFS for sharing directories between MongoDB and Web Servers.

Prerequisites

Two storage servers with static IPs.

Step-by-Step Guide

Step 1: Install DRBD and GlusterFS on Both Storage Servers

1. Install DRBD and GlusterFS:

sudo apt install drbd-utils glusterfs-server -y

Step 2: Configure DRBD

1. Create a DRBD Resource File:

sudo nano /etc/drbd.d/data.res

DRBD Resource File:

resource data {
    protocol C;
    on STORAGE1 {
        device /dev/drbd0;
        disk /dev/sdb1;
        address <IP_STORAGE1>:7789;
        meta-disk internal;
    }
    on STORAGE2 {
        device /dev/drbd0;
        disk /dev/sdb1;
        address <IP_STORAGE2>:7789;
        meta-disk internal;
    }
}

2. Initialize DRBD:

sudo drbdadm create-md data
sudo drbdadm up data

Step 3: Configure GlusterFS on DRBD-Backed Storage

1. Create a Shared Directory on both nodes:

sudo mkdir -p /data/glusterfs

2. Create a GlusterFS Volume on STORAGE1:

sudo gluster volume create data replica 2 <IP_STORAGE1>:/data/glusterfs <IP_STORAGE2>:/data/glusterfs force
sudo gluster volume start data

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