Configuring application clusters

For a medium or large sized deployment, an administrator deploys multiple instances of the TrueSight Automation Console application server component and creates an application cluster. You must configure a cluster of application servers to replicate information, so if one fails, other members of the cluster have access to the same information. 

You can use any proxy solution to configure application clusters. This topic provides instructions on how to share data in a TrueSight Automation Console (on-premises) application cluster using the High Availability Proxy (HA Proxy) solution. 

Configuring an application cluster using HA Proxy

1. On a host where the Automation Console application is not installed, run the following command to install HA Proxy.

   yum install haproxy

   A configuration file, haproxy.cfg gets created in the /etc/haproxy directory.

2. Navigate to the /etc/haproxy directory and replace the content in the default haproxy.cfg file with the following content. 

   Sample haproxy.cfg file

   #---------------------------------------------------------------------
   #Exmple configuration for a possible web application.  See the
   # full configuration options online.
   #
   #   http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
   #
   #---------------------------------------------------------------------
   
   #---------------------------------------------------------------------
   # Global settings
   #---------------------------------------------------------------------
   global
       # to have these messages end up in /var/log/haproxy.log you will
       # need to:
       #
       # 1) configure syslog to accept network log events.  This is done
       #    by adding the '-r' option to the SYSLOGD_OPTIONS in
       #    /etc/sysconfig/syslog
       #
       # 2) configure local2 events to go to the /var/log/haproxy.log
       #   file. A line like the following can be added to
       #   /etc/sysconfig/syslog
       #
       #    local2.*                       /var/log/haproxy.log
       #
      log 127.0.0.1 local2
   
      chroot      /var/lib/haproxy
      pidfile     /var/run/haproxy.pid
      maxconn     4000
      user        haproxy
      group       haproxy
      daemon
   
       # turn on stats unix socket
      stats socket /var/lib/haproxy/stats
   
   defaults
          timeout server 86400000
          timeout connect 86400000
          timeout client 86400000
          timeout queue   1000s
   
   
   frontend localnodes
   bind *:<portNumber>
      mode tcp
      default_backend http_1
   
   
   # Learn SSL session ID from both request and response and create affinity.
   backend http_1
      mode tcp
      balance roundrobin
   
       # maximum SSL session ID length is 32 bytes.
      stick-table type binary len 32 size 30k expire 30m
   
      acl clienthello req_ssl_hello_type 1
      acl serverhello rep_ssl_hello_type 2
   
       # use tcp content accepts to detects ssl client and server hello.
      tcp-request inspect-delay 5s
      tcp-request content accept if clienthello
   
       # no timeout on response inspect delay by default.
      tcp-response content accept if serverhello
   
       # SSL session ID (SSLID) may be present on a client or server hello.
       # Its length is coded on 1 byte at offset 43 and its value starts
       # at offset 44.
       # Match and learn on request if client hello.
      stick on payload_lv(43,1) if clienthello
   
       # Learn on response if server hello.
      stick store-response payload_lv(43,1) if serverhello
   
       server server1 <IPAddress_hostA>/<FQDN_hostA>:<portNumber>
       server server2 <IPAddress_hostB>/<FQDN_hostB>:<portNumber>
   
   

3. Open the file in a text editor, and locate the frontend localnodes section and replace <portNumber> with the secure port used to access the Automation Console application. 
   

   Example

   frontend localnodes
   bind *:10443
      mode tcp
       default_backend http_1

4. At the end of the file, replace <IPAddress_hostA>/<FQDN_hostA> with the Fully Qualified Domain Name or IP Address of the application server host and port number with the secure port used to access Automation Console application.
   Increase the number of entries based on the number of applications you have installed. For example, if you have four instances of application, add four server counter entries. 
   

   Note

   You must specify the same port number for all the application servers.

5. Save changes and run the service haproxy restart command to restart the HA Proxy service.

Related topics

Deployment-scenarios

Deployment-sizing-requirements