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Cloud: The Simplest High Availability Cluster with Synchronous Real-Time Replication and Failover

Evidian SafeKit

How the Evidian SafeKit software simply implements a high availability cluster in Cloud?

The solution in Cloud

Evidian SafeKit brings high availability in Cloud between two Windows or Linux redundant servers.

This article explains how to implement quickly a Cloud cluster without shared disk and without specific skills.

A generic product

Note that SafeKit is a generic product on Windows and Linux.

You can implement with the same product real-time replication and failover of any file directory and service, database, complete Hyper-V or KVM virtual machines, Docker, Kubernetes , Cloud applications.


SafeKit mirror cluster with real-time replication and failover in Cloud?

How it works in Cloud?

  • The servers are running in different availability zones.
  • The critical application is running on the PRIM server.
  • Users are connected to a primary/secondary virtual IP address which is configured in the Cloud load balancer.
  • SafeKit provides a generic health check for the load balancer.
    On the PRIM server, the health check returns OK to the load balancer and NOK on the SECOND server.
  • In each server, SafeKit monitors the critical application with process checkers and custom checkers.
  • SafeKit restarts automatically the critical application when there is a software failure or a hardware failure thanks to restart scripts.
  • SafeKit makes synchronous real-time replication of files containing critical data.
  • A connector for the SafeKit web console is installed in each server.
    Thus, the high availability cluster can be managed in a very simple way to avoid human errors.

Partners, the success with SafeKit

This platform agnostic solution is ideal for a partner reselling a critical application and who wants to provide a redundancy and high availability option easy to deploy to many customers.

With many references in many countries won by partners, SafeKit has proven to be the easiest solution to implement for redundancy and high availability of building management, video management, access control, SCADA software...

Building Management Software (BMS)

Video Management Software (VMS)

Electronic Access Control Software (EACS)

SCADA Software (Industry)

Free trial + installation a SafeKit mirror cluster in the Cloud between two redundant Windows or Linux servers

SafeKit Modules for Plug&Play Redundancy and High Availability Solutions

Advanced clustering architectures

Several modules can be deployed on the same cluster. Thus, advanced clustering architectures can be implemented:

Demonstrations of Redundancy and High Availability Solutions

SafeKit Webinar

This webinar presents in 2 minutes Evidian SafeKit.

In this webinar, you will understand SafeKit mirror and farm clusters.

Microsoft SQL Server Cluster

This video shows a mirror module configuration with synchronous real-time replication and failover.

The file replication and the failover are configured for Microsoft SQL Server but it works in the same manner for other databases.

Free trial here

Apache Cluster

This video shows a farm module configuration with load balancing and failover.

The load balancing and the failover are configured for Apache but it works in the same manner for other web services.

Free trial here

Hyper-V Cluster

This video shows a Hyper-V cluster with full replications of virtual machines.

Virtual machines can run on both Hyper-V servers and they are restarted in case of failure.

Free trial here

SafeKit High Availability Differentiators against Competition

SafeKit Technical Documentation

SafeKit Training


  1. Overview / pptx

    • Features
    • Architectures
    • Distinctive advantages
  2. Competition / pptx

    • Hardware vs software cluster
    • Synchronous vs asynchronous replication
    • File vs disk replication
    • High availability vs fault tolerance
    • Hardware vs software load balancing
    • Virtual machine vs application HA

Installation, Console, CLI

  1. Install and setup / pptx
    • Package installation
    • Nodes setup
    • Cluster configuration
    • Upgrade
  2. Web console / pptx
    • Cluster configuration
    • Configuration tab
    • Control tab
    • Monitor tab
    • Advanced Configuration tab
  3. Command line / pptx
    • Silent installation
    • Cluster administration
    • Module administration
    • Command line interface

Advanced configuration

  1. Mirror module / pptx
    • userconfig.xml + restart scripts
    • Heartbeat (<hearbeat>)
    • Virtual IP address (<vip>)
    • Real-time file replication (<rfs>)
  2. Farm  module / pptx
    • userconfig.xml + restart scripts
    • Farm configuration (<farm>)
    • Virtual IP address (<vip>)
  3. Checkers / pptx
    • Failover machine (<failover>)
    • Process monitoring (<errd>)
    • Network and duplicate IP checkers
    • Custom checker (<custom>)
    • Split brain checker (<splitbrain>)
    • TCP, ping, module checkers


  1. Support tools / pptx
    • Analyze snapshots
  2. Evidian support / pptx
    • Get permanent license key
    • Register on support.evidian.com
    • Call desk