[ClusterLabs] DLM not working on my GFS2/pacemaker cluster

Jan Pokorný jpokorny at redhat.com
Tue Jan 19 04:03:11 EST 2016

On 18/01/16 21:47 -0500, daniel at benoy.name wrote:
> Here's the exact same command run twice. First, on a very similarly
> configured cluster (which is currently running):
>   # cat /sys/kernel/config/dlm/cluster/comms/169446438/addrcat
>   cat: /sys/kernel/config/dlm/cluster/comms/169446438/addr: Permission
> denied
> (That's what I expect to see. It's a write-only file.)
> And now on this messed up cluster:
>   # cat /sys/kernel/config/dlm/cluster/comms/168528918/addr
>   cat: /sys/kernel/config/dlm/cluster/comms/168528918/addr: Operation not
> permitted
> Why 'operation not permitted'? dmesg isn't telling me anything at all, and I
> don't see any way to get the kernel to spit out some kind of explanation for
> why it's blocking me. Can anyone help? At least point me in a direction
> where I can get the system to give me some indication why it's behaving this
> way?

Was this on SELinux-enabled system, SELinux would be the suspect #1.
Can AppArmor (or any other enforcing mechanism) have a similar effect?

Jan (Poki)
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