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To configure a highly available SaltStack environment, you must set up a multi-master architecture where minions can communicate with multiple master servers. Additionally, configuration files, state files, and keys must be synchronized between the primary and secondary masters to ensure consistency during a failover. 1. Configuring Salt Minion ...

Initialize a Cluster on the First Host Log into the initial Proxmox instance, referred to here as host-alpha. Use the cluster management tool to form a new group: pvecm create alpha-group This command generates the Corosync authentication material, writes it to /etc/corosync/authkey, and produces an updated /etc/pve/corosync.conf. The cluster ...

Redis Sentinel is a system designed to help manage Redis instances, providing high availability through monitoring, notification, and automatic failover. It oversees master and replica instances, promoting a replica to master if the current master fails. This article explains the core concepts of Redis Sentinel and demonstrates how to integrate ...

Virtual IP Configuration virtual_ipaddress { 10.0.0.3/24 dev eth0 label eth0:1 } track_script { health_check } Failover Testing [root@lb01 ~]# systemctl is-active nginx active [root@lb01 ~]# ip a | grep 0.3 inet 10.0.0.3/24 scope global secondary eth0:1 [root@lb01 ~]# systemctl stop nginx [root@lb01 ~]# ip a | grep 0.3 # VIP migrated after ...

Management High Availability OverviewTo ensure robust administration capabilities, a Ceph cluster requires multiple management nodes. Relying on a single management node creates a single point of failure; if that node goes down, cluster administration becomes impossible. Administrative access is generally divided into two categories: web dashbo ...

What is Redis Redis is a high‑performance, in‑memory key‑value database that also supports optional data persistence. It is open‑source and written in C, widely used both as a cache and as a primary datastore for specialised scenarios. Why Redis Is So Fast In‑memory storage – data is served directly from RAM, avoiding disk I/O for most operati ...

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 ...

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 ...

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 ...

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 ...