Hanwha SSM (ex Samsung Security Manager) High Availability with Synchronous Replication and Failover

Evidian SafeKit brings high availability to Hanwha SSM (ex Samsung Security Manager), the CCTV video surveillance system. This article explains how to implement quickly a Hanwha SSM cluster without shared disk and without specific skills. A free trial is offered.

How the Evidian SafeKit software simply implements Hanwha SSM (ex Samsung Security Manager) high availability with real-time synchronous replication and failover without shared disk

How the Evidian SafeKit mirror cluster implements Hanwha SSM (ex Samsung Security Manager) high availability with synchronous replication and failover?

On the previous figure, the server 1/PRIM (Windows) runs Hanwha SSM (ex Samsung Security Manager) with its PostgreSQL database. Users are connected to the virtual IP address of the mirror cluster. SafeKit replicates files opened by Hanwha SSM (ex Samsung Security Manager) in real time (the PostgreSQL database). Only changes in the files are replicated across the network, thus limiting traffic (byte-level file replication). Names of file directories containing Hanwha SSM (ex Samsung Security Manager) database are simply configured in SafeKit. There are no pre-requisites on disk organization for the two servers. Directories to replicate may be located in the system disk. SafeKit implements synchronous replication with no data loss on failure contrary to asynchronous replication.

In case of server 1 failure, there is an automatic failover on server 2 with restart of Hanwha SSM (ex Samsung Security Manager). Then, when server 1 is restarted, SafeKit implements failback with reintegration of Hanwha SSM (ex Samsung Security Manager) database without stopping Hanwha SSM (ex Samsung Security Manager) on server 2. Finally, the system returns to synchronous replication between server 2 and server 1. The administrator can decide to swap the role of primary and secondary and return to a server 1 running Hanwha SSM (ex Samsung Security Manager). The swap can also be done automatically by configuration.

Configuration overview of Hanwha SSM (ex Samsung Security Manager) high availability with synchronous replication and failover

With SafeKit, you can configure either a farm application module or a mirror application module according the high availability architecture suited for an application. For Hanwha SSM (ex Samsung Security Manager) high availability with synchronous replication and failover, the right module is the mirror module.

Configuration overview of Hanwha SSM (ex Samsung Security Manager) high availability with synchronous replication and failover

The configuration files for Hanwha SSM (ex Samsung Security Manager) high availability are given  for Windows here.

They include:

1. the Hanwha SSM (ex Samsung Security Manager) stop and start scripts,

2. the configuration file userconfig.xml which contains:

Deployment of Hanwha SSM (ex Samsung Security Manager) high availability with synchronous replication and failover requires no specific IT skills:

    • install Hanwha SSM (ex Samsung Security Manager) on two standard Windows servers
    • install the SafeKit software on both servers
    • install the hanwha_ssm.safe module

SafeKit configuration files on Windows and for Hanwha SSM (ex Samsung Security Manager) high availability with synchronous replication and failover

Installation instructions

userconfig.xml

<!DOCTYPE safe>
<safe>
<service mode="mirror" defaultprim="alone" maxloop="3" loop_interval="24" failover="on">
  <!-- Heartbeat Configuration -->
  <!-- Names or IP addresses on the default network are set during initialization in the console -->
  <heart pulse="700" timeout="30000">
    <heartbeat name="default" ident="flow">
    </heartbeat>
  </heart>
  <!-- Virtual IP Configuration -->
  <!-- Replace
     * VIRTUAL_TO_BE_DEFINED by the name of your virtual server 
  -->
  <vip>
    <interface_list>
        <interface check="on" arpreroute="on"> 
	      <real_interface>
               <virtual_addr addr="VIRTUAL_TO_BE_DEFINED" where="one_side_alias" />
          </real_interface>
        </interface>
    </interface_list>
  </vip>
  <!-- Software Error Detection Configuration -->
  <errd polltimer="10">
    <!-- Samsung SSM process -->
         <proc name="pg_ctl.exe" atleast="1" action="restart" class="prim" />
         <proc name="ServiceManager.exe" atleast="1" action="restart" class="prim" />
		<!--         
			<proc name="HAServerService.exe" atleast="1" action="restart" class="prim"/>
		-->
  </errd>
  <!-- File Replication Configuration -->
  <!-- Adapt with the directory of your PostgreSQL database and logs
  -->
  <rfs async="second" acl="off" nbrei="3">
     <replicated dir="C:\PostgreSQL\9.1\data" mode="read_only">
        <notreplicated path="pg_log"/>
        <notreplicated path="postmaster.pid"/>
     </replicated>
     <replicated dir="C:\Program Files (x86)\Samsung\SSM\SystemManager\MapFile" mode="read_only"/>
  </rfs>
  <!-- User scripts activation -->
  <user nicestoptimeout="300" forcestoptimeout="300" logging="userlog" />
</service>
</safe>

start_prim.cmd

@echo off

rem Script called on the primary server for starting application services 

rem For logging into SafeKit log use:
rem "%SAFE%\safekit" printi | printe "message"

rem stdout goes into Application log
echo "Running start_prim %*" 

set res=0

rem TODO: set to manual the start of services when the system boots

net start "postgresql-9.1 - PostgreSQL Server 9.1"
if not %errorlevel% == 0 (
  %SAFE%\safekit printi "PostgreSQL (postgresql-9.1 - PostgreSQL Server 9.1) start failed"
  goto stop
) else (
  %SAFE%\safekit printi "PostgreSQL (postgresql-9.1 - PostgreSQL Server 9.1) started"
)

net start "SSM System Manager"
if not %errorlevel% == 0 (
  %SAFE%\safekit printi "SSM System Manager start failed") 
  goto stop
) else (
  %SAFE%\safekit printi "SSM System Manager started"
)

net start "SSM Watch Services Manager"
if not %errorlevel% == 0 (
  %SAFE%\safekit printi "SSM Watch Services Manager start failed"
  goto stop
) else (
  %SAFE%\safekit printi "SSM Watch Services Manager started"
)

rem net start "HA Server Service"
rem if not %errorlevel% == 0 (
rem  %SAFE%\safekit printi "HA Server Service start failed"
rem  goto stop
rem ) else (
rem   %SAFE%\safekit printi "HA Server Service started"
rem )

if %res% == 0 goto end

:stop
set res=%errorlevel%
"%SAFE%\safekit" printe "start_prim failed"

rem uncomment to stop SafeKit when critical
rem "%SAFE%\safekit" stop -i "start_prim"

:end

stop_prim.cmd

@echo off

rem Script called on the primary server for stopping application services 

rem For logging into SafeKit log use:
rem "%SAFE%\safekit" printi | printe "message"

rem ----------------------------------------------------------
rem
rem 2 stop modes:
rem
rem - graceful stop
rem   call standard application stop with net stop
rem
rem - force stop (%1=force)
rem   kill application's processes
rem
rem ----------------------------------------------------------

rem stdout goes into Application log
echo "Running stop_prim %*" 

set res=0

rem action on force stop
if "%1" == "force" (
  %SAFE%\safekit printi "Force stop: kill processes of Samsung SSM application" 
  %SAFE%\safekit kill -name="watchservices.exe" -level="terminate"
  %SAFE%\safekit kill -name="java.exe" -argregex=".*systemmanager.*" -level="terminate"
  %SAFE%\safekit kill -name="pg_ctl.exe" -level="terminate"
  %SAFE%\safekit kill -name="postgres.exe" -level="terminate"
  %SAFE%\safekit kill -name="HAServerService.exe" -level="terminate"
  %SAFE%\safekit kill -name="systemanager.exe" -level="terminate"
  goto end
)

rem %SAFE%\safekit printi "Stopping HA Server Service"
rem net stop "HA Server Service"

%SAFE%\safekit printi "Stopping SSM Watch Services Manager"
net stop "SSM Watch Services Manager"

%SAFE%\safekit printi "Stopping SSM System Manager"
net stop "SSM System Manager"

%SAFE%\safekit printi "Stopping PostgreSQL (postgresql-9.1 - PostgreSQL Server 9.1)"
net stop "postgresql-9.1 - PostgreSQL Server 9.1"
del C:\PostgreSQL\9.1\data\postmaster.pid

rem Wait a little for the real stop of services
"%SAFEBIN%\sleep" 10

if %res% == 0 goto end

"%SAFE%\safekit" printe "stop_prim failed"

:end

Demonstration

This demonstration is made with Microsoft SQL Server Express but the operating mode is the same as Hanwha SSM.

More on SafeKit

Other examples of high availability modules:

Mirror modules

Windows

Linux

Microsoft SQL ServerWindows module-
OracleWindows moduleLinux module
MySQLWindows moduleLinux module
PostgreSQLWindows moduleLinux module
FirebirdWindows moduleLinux module
Hyper-VWindows module-
Hanwha SSMWindows module-
Milestone XProtectWindows module-
Generic moduleWindows moduleLinux module

Farm modules

Windows

Linux

IIS moduleWindows module-
Apache moduleWindows moduleLinux module
Generic moduleWindows moduleLinux module
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