topic Re: Service Guard on Linux in Operating System - Linux

Service Guard on Linux

J.D._3 — Tue, 08 Jul 2003 22:57:39 GMT

Hi all,
I have a 2 node cluster and a quorum server running Red Hat Linux 7.3 with Kernel 2.4.18. If I created 5 packages, (sg_pkg1, sg_pkg2, sg_pkg3, sg_pkg4, sg_pkg5), how could I set it up so that each control script associated with each package is launched from 1 through 5 at startup and 5 through 4 on shutdown of the cluster? Thank you all in advance.
JD

Re: Service Guard on Linux

Balaji N — Tue, 08 Jul 2003 23:19:15 GMT

this can be a possible work around if there is no configuration.

you can modify the control scripts in such a way that it checks if the previous package is already started and then only it gets started.

and can be done similarly for shutdown as well.

-balaji

ps: Service Guard on Linux!!!! Is it the same MC/SG. never knew such a product existed.

Re: Service Guard on Linux

J.D._3 — Tue, 08 Jul 2003 23:45:47 GMT

Yes, MCSG is available for Linux :), works the same and binaries are the same execpt the directory structure installs in /usr/local/cmcluster. I'm finding new things about it myself. Thanks for the info.

Re: Service Guard on Linux

Balaji N — Tue, 08 Jul 2003 23:49:14 GMT

nice to know this. when time permits, will check out more on this.
-balaji

Re: Service Guard on Linux

Serviceguard for Linux — Thu, 10 Jul 2003 14:25:09 GMT

Serviceguard for Linux uses the same code base as MC/SG on HP/UX. There are some differences, mostly because of differences between HP/UX and Linux.

This URL is a good starting point for information:
http://h18000.www1.hp.com/solutions/enterprise/highavailability/linux/serviceguard/index.html

Re: Service Guard on Linux

Steven E. Protter — Thu, 10 Jul 2003 14:42:51 GMT

I am wondering if it can be used on Non-HP hardware.

Quite an interesting development.

I've got just the kind of operation with my web hosting business that would benefit from this product.

SEP

Re: Service Guard on Linux

Steven E. Protter — Thu, 10 Jul 2003 14:43:55 GMT

The document already answers my question. It is only currently supported on Proliant Servers.

Me thinks that is a marketing mistake HP.

SEP

Re: Service Guard on Linux

Krishna Prasad — Thu, 10 Jul 2003 15:02:29 GMT

Is this what you get when you install Advanced Server on RedHat?

Also, isn't there other cluster programs available for Linux?

If there is other cluster applications has anyone had any success with them?

Re: Service Guard on Linux

J.D._3 — Thu, 10 Jul 2003 21:51:34 GMT

There is a application called Life Keeper that we are also using but phasing out. Why would you not use Service Guard instead?

Re: Service Guard on Linux

Krishna Prasad — Fri, 11 Jul 2003 12:27:33 GMT

It really isn't a Service Guard vs something else question. It's more of Cost vs Free and a Active/Passive and Active/Active solution.

I know the Red Hat Advanced Server has clustering functionality.

I was just wondering what else was available because Service Guard is a Active/Passive solution. I would much rather have an Active/Active solution if there is one available.

Re: Service Guard on Linux

Serviceguard for Linux — Fri, 11 Jul 2003 12:44:21 GMT

As the term is usally used, Serviceguard is an Active-Active cluster. Every node in the cluster can be running appliucations. In that case, after a failover one node would be running two (or more) applications.

I believe that is also the case for Likekeeper.

The cost vs free question is one that everyone has to decide for themselvrs based on what your trying to do and potential business impact.