How to setup Cpanel Dns Cluster’s failure threshold.
This section allows you to specify the number dnsadmin commands that are allowed to fail before a member of your cluster is disabled.
Unresponsive cluster members are disabled in an effort to improve performance.
Global cluster configuration options
If you wish for all of the members of your cluster to remain online at all times, enter 0.
Cpanel recommend setting this value to 10.
Reference : http://cpanel.net/
What is dnsadmin in Cpanel Servers
DnsAdmin is a GPL development project to create a set of programs to manage dns information.
Support is included for bind and djbdns.
dnsadmin is a set of programs that helps manage DNS information.
Reference : http://www.inter7.com/
Limit the number of Rails applications in Cpanel Server
You can limit the number of Rails applications your customers can install.
To do this in WHM, go to Modify an Account, click the domain name you wish to limit, and in the Max Mongrel Instances (Ruby on Rails) box, specify the desired maximum number of applications.
Creating a Ruby on Rails Application in Cpanel Server
Ruby on Rails runs on its own server so the setup requires a little extra work.
1. Log into cPanel.
2. Navigate to the Software/Services section of your cPanel interface.
3. Click the Ruby on Rails icon.
* This step will open the Ruby on Rails management interface.
4. Specify your application’s name in the App Name field.
* PICK Remember: To set your application to load when the server is booted, click the Load on Boot? check box.
5. Assign the application path in the Application Path field.
* note Note: If you set an application path in your public_html/ directory, your source code and configuration files can be viewed by anyone on the web.
6. Use the Environment drop-down menu to select the type of Ruby on Rails environment you wish to run.
7. Click Create.
Cpanel DNS Cluster Configuration - how it should be configured
If at all possible, you should link your web server directly to the DNS servers, you will need to sync each web server to its DNS servers.
Performance:
Creating a cluster setup with direct links between servers can decrease CPU load, improving the performance of your servers. The more steps, or “hops,” between a web server and a nameserver, the slower the servers’ performance will be.
You should not set a DNS server to sync data back to a web server, as this will put extraneous data on the web server.
For each intermediate server you add, the data transfer time is 3 times slower than for a direct link.
