[ClusterLabs] Q: cryptic messages from "QB"

Christine Caulfield ccaulfie at redhat.com
Wed Nov 25 04:17:26 EST 2020

On 25/11/2020 08:45, Ulrich Windl wrote:
> Hi!
> Setting up a cluster in SLES15 SP2, I wonder about a few log messages:
> 1) what does "QB" stand for?
> 2) When QB talks about "server", does it mean "service"?
> Examples:
> corosync[7982]:   [QB    ] server name: cmap
> corosync[7982]:   [QB    ] server name: cfg
> corosync[7982]:   [QB    ] server name: cpg
> corosync[7982]:   [QB    ] server name: votequorum
> corosync[7982]:   [QB    ] server name: quorum
> 3) what is "7982-7987-25" in "corosync[7982]:   [QB    ] Denied connection, is not ready (7982-7987-25)"?

2) "QB" is just how corosync tags messages that are issued by libqb - 
which is the library that provides IPC services (mostly) to corosync 
andothers. It's just logging the services that have been registered.

1) QB originally stood for "QuarterBack". I have no idea what that is 
though I beleive it may be sport-related. In the spec file for Fedora I 
renamed it to "Quite Boring" as it's a library that provides basic 
services ;-)

3) That's just the unique name of the connection. it's made up of the 
process PIDs and an incrementing number. The actual full IPC name in 
/dev/shm has extra bits added on the end to stop them being guessable.


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