LERR Project

 

LERR is an important software in ASCC PC Farm.

Table of Contents

 

What the LERR is

LERR(Local Environment Remote Resources) is an advanced remote execution software on UNIX environment. LERR is a remote execution tool with local environment setting. We are using it in the our Linux cluster environment. With LERR, the return value is passed back to the local after the remote program is finished. Therefore, remote programs act just like local programs. Currently, we can use LERR-type applications in 'make' and 'shell script' without any trouble. Around Nov. 1998, we are going to put our Package Cluster on line with LERR and load balancing capabilities.

In LERR, we can assign each application with thier own environment parameters. This feature is especially good for cluster environments. That is, the same remote executable with the local customized setting is possible.

 

Major features

 

 

Comparison with other remote execution tools

  Local Environment Variables TTY X Execution Interactive Mode Security Return Value
lerr Yes Yes Yes

Remote

by label

Enable
  • Trusted hosts
  • uid/gid
  • tcp_wrapper
  • PAM(Linux only)
  • Customization for each application
 Yes
DQS No No No

Local

by path

No
  • Trusted hosts
  • uid/gid
 No
rlogin No Yes No

Remote

by path

Yes
  • uid/gid
  • tcp_wrapper
  • .rhosts
  • PAM(Linux only)
 No
rsh No No No

Local

by path

No
  • uid/gid
  • tcp_wrapper
  • .rhosts
  • PAM(Linux only)
 No

 

LERR in PC Cluster

 

 

LERR Applications

 

 

History

A brief introduction to LERR history

 

To Do

  1. SSL enabled
  2. Kerberos Enabled
  3. Open Source LERR before Mar. 2005.

 

Download

Please be patience to wait for LERR open to the public ...

Any question please contact tyuan@beta.wsl.sinica.edu.tw

Last Updated on 2004-09-20