Overview

ZStack Cloud provides high availability (HA) for multiple management nodes (MNs, also known as hosts) by using separate HA suites. When any one of the MNs is disconnected, the HA will be triggered in seconds to ensure the business continuity.

This Tutorial provides an example of a dual-MN HA scenario.

HA Mechanism

In a dual-MN model, each MN runs a zsha2 HA process. This process monitors the critical services, including the MN service, UI service, and database service, on each MN in real time. When any critical service is down, the Cloud immediately triggers virtual IP (VIP) migration through Keepalived, and then attempts to restore the downtime service.

Figure 1. Dual-MN HA



Installation and Deployment

This section mainly describes how to install and deploy a dual-MN HA environment.


Prepare Software Tools

The administrator needs to prepare the following necessary software packages to facilitate the installation and deployment process.
  • ZStack Cloud custom ISO (c76 is recommended.)
    • ZStack Cloud custom ISO:
      • Software (C76): ZStack-Cloud-x86_64-DVD-4.2.0-c76.iso
      • Software (C74): ZStack-Cloud-x86_64-DVD-4.2.0-c74.iso
      • Download address: Click here.
    • ZStack Cloud installation package:
      • Software: ZStack-Cloud-installer-4.2.0.bin
      • Download address: Click here.
  • Multi-MN HA suite
    • Software: ZStack-Multinode-HA-Suite-4.2.0.tar.gz
    • Download address: Click here.
Note: After you download the required software, confirm the integrity of the file by using the MD5 checksum tool.














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