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HA-OSCAR: Five Steps to a High-Availability Linux Cluster
Pages: 1, 2, 3, 4

Standby Server Setup

After you complete the primary server network and detection channel configuration, create a virtual network interface and enable channel detection. First, switch to the standby server terminal and access HA-OSCAR Webmin by opening http://localhost:10000 (the link will only work if you've enabled this locally). The setup steps are similar to those shown earlier in the primary server setup section. When you finish configuring the network interface, select only the Channel configuration on standby server button. Otherwise, it may cause unpredictable behavior and invalid configuration.

Virtual Network Interface Creation on the Standby Server

You can create a virtual network interface for the standby server that is similar to the primary server configuration. Figure 21 shows how to set up the standby server's virtual network interface. Be sure not to activate the virtual public IP at boot time. It should come up only at the failover when a user creates a virtual public interface, perhaps eth1:1.

standby server network interface
Figure 21. The standby server network interface screen

adding a new virtual network interface
Figure 22. Adding a new virtual network interface to eth1

a new network interface
Figure 23. A new network interface created on the standby server

configuring a detection channel
Figure 24. Configuring a detection channel on the standby server

Figure 25. More configuration for the detection channel

When you complete configuring both the network interface and the detection channel, return to the index page and apply the configuration (Figure 26).

applying the configuration change
Figure 26. Applying the changes after channel configuration


This article is meant as a guide to help you on your feet with your installation and configuration of a highly available Linux cluster using HA-OSCAR.

Related Reading

High Performance Linux Clusters with OSCAR, Rocks, OpenMosix, and MPI
By Joseph D. Sloan

Open source projects have a special dynamic, especially popular projects, and they tend to advance and change as their users request. Therefore, if any of the steps/functionality/screen captures above are not valid by the time you read this article, this will be due to changes in the HA-OSCAR package; please forgive us and post an update on the discussion forum.

We hope you find this article useful. Have fun.

Happy Hacking!


  • Vishal Rampure, Anand Tikotekar, and Ryan Bourgeois from Louisiana Tech University
  • HA-OSCAR Team (Louisiana Tech University, Oak Ridge National Lab, Ericsson Research, Intel)
  • Intel, for an equipment loan

Future Work

  • Support network private interface failover for all Ethernet interfaces.
  • Remove the OSCAR dependency so any Linux Beowulf can be retrofitted with HA-OSCAR.
  • Provide automatic head-node image synchronization via resync.
  • Provide automatic virtual network and detection channel configuration (instead of manual).
  • Integrate the Distributed Security Infrastructure with HA-OSCAR. This activity has started and we have a lab version of a combined package of HA-OSCAR and DSI.
  • Much more


Application Service Providers
Dynamic Host Configuration Protocol
Fault management, Configuration, Accounting, Performance, and Security
High Availability
High Availability OSCAR
High Performance Computing
Internet Service Provider
International Telecommunication Union
Local Area Network
Media Access Control
Open Cluster Group
Open Source Clustering and Application Resources
Resource-Based Cluster Installation Tool
Network File System
Network Interface Card
Network Time Protocol
SIS SystemImager
Image-Based Installation and Maintenance Tool
Simple Network Management Protocol
Trivial File Transfer Protocol
A diskless OSCAR version
Telecommunication Management Network

Ibrahim Haddad is the Director of Technology for the Software Operations Group (Home & Network Mobility Business Unit) at Motorola Inc.

Chokchai Leangsuksun is an Associate Professor of Computer Science, Louisiana Tech University.

Stephen L. Scott is a founding member of OCG and OSCAR - and has served in the capacity of both release manager and working group chair

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