Setting Up SQL Server 2019 Always On Availability Groups on Linux with Pacemaker
Environment Preparation
Infrastructure Requirements
Three servers minimum for a proper cluster setup:
Node
IP Address
Role
m191
192.168.1.191
Primary replica
m192
192.168.1.192
Secondary replica
m193
192.168.1.193
Secondary replica
Operating system: CentOS 7.6 with 2 CPU cores, 4GB RAM, and 20GB storage.
Pre-Installation Configura ...
Posted on Thu, 14 May 2026 05:18:21 +0000 by frikikip
Foundations of Operations Management and the IT Operations Framework
Operations management encompasses the strategies and practices used to ensure the reliability, efficiency, and continuous evolution of IT services. This article explores the core components, including ITIL service structures, incident and problem management, standardization, automation, high availability concepts, and team organization.
ITIL Se ...
Posted on Wed, 13 May 2026 17:03:31 +0000 by kante
Deploying a Proxmox VE Ceph High-Availability Cluster with OVS Bonding
Cluster Installation
Refer to the official documentation for basic cluster installation:
Proxmox VE Cluster Installation Guide
Management and Bussiness Network Setup
Confiugre the management and business networks as described in:
Proxmox VE Network Configuraton
Ceph Network Configuration
Create OVS bonds and VLAN interfaces for Ceph traffic ...
Posted on Wed, 13 May 2026 10:30:13 +0000 by mwl707
Configuring Oracle Data Guard for 11g RAC with ASM Storage
Environment Overview
The following infrastructure details apply to the Primary and Standby sites. Note that the Standby instance requires only the database software installation; the database itself is created logically during recovery.
# /etc/hosts Configuration
# Public IPs
192.168.10.10 prod-prm-1
192.168.10.11 prod-prm-2
192.168.10.12 d ...
Posted on Mon, 11 May 2026 00:15:54 +0000 by JohnnyBlaze
Oracle RAC Cluster Heartbeat Mechanisms and Best Practices
Physical Network Configuration Guidelines
Avoid direct crossover cabling between nodes; use dedicated switches instead.
Isolate the private interconnect (heartbeat network) from the public application network.
If sharing a switch is unavoidable, enforce VLAN segmentation.
Oracle explicitly prohibits crossover cables for Clusterware internal ...
Posted on Sat, 09 May 2026 14:38:34 +0000 by kinaski
Redis Replication: Configuration, Topology, and Synchronization Mechanisms
Table of Contents
Introduction to Replication
Replication Configuration
Establishing Replication
Terminating Replication
Topology Structures
Replication Process
Data Synchronization Internals
Components Required for PSYNC
PSYNC Command
Full Synchronization
Partial Synchronization
Master-Replica Heartbeat
Full Sync Triggers
Common Configu ...
Posted on Sat, 09 May 2026 03:10:03 +0000 by robin339
Building a 3-Node Redis Sentinel Cluster with Bloom Filter on CentOS 7
Environment Preparation
Server Allocation
Hostname
IP
Role
Sentinel
redis-sentry-0
10.10.101.26
Primary
Yes
redis-sentry-1
10.10.101.27
Replica
Yes
redis-sentry-2
10.10.101.28
Replica
Yes
Install Dependencies
Redis will be compiled from source, so install the build tools first:
# Install GCC 9
yum -y install centos-release-scl
yum ...
Posted on Fri, 08 May 2026 17:11:32 +0000 by iifs044
Redis Cluster Architectures: Replication, Sentinel, and Distribution
Master-Slave Replication
The master-slave replication mechanism in Redis automatically synchronizes data from the master node to one or more slave nodes based on configuration settings. The master node primarily handles write operations, while slave nodes are optimized for read operations. The general principle is to configure multiple slaves r ...
Posted on Fri, 08 May 2026 16:54:30 +0000 by mvidberg