rpm -Uvh http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
Category Archives: CentOS - Page 2
CentOS 5 – add dag repo
Posted by moti
on October 22, 2009
No comments
Linux HA – CRM commands
Posted by moti
on July 22, 2009
No comments
Small reminder as I always tend to forget these :
Dump the CRM cib db :
cibadmin -Q > cib.backup.xml
Modify a resource , dump the cib, modify the xml for the resources and then import using cibadmin -M
cibadmin -V -M -o resources -x modified_resources.xml
Add a resource , create the xml for the resource and them use -C
cibadmin -V -C -o resources -x new_resource.xml
Move resource from one location to another, -f to force it …
crm_resource -M -r resource -H host
crm_resource -M -r resource -H host -f
DRBD , Centos and unmount nfs resources
Posted by moti
on April 20, 2009
1 comment
I have recently built a DRBD + Linux HA NFS cluster , part of the structure was to create a drbd disk resource and mount it on /var/lib/nfs. This allows to switch nfs over to the secondary node without getting “stale nfs handle” errors. Heartbeat was having a hardtime doing a clean umount of the file system and ended up rebooting the machine.
Apr 20 06:47:07 fs Filesystem[9823]: [9887]: INFO: No processes on /var/lib/nfs were signalled
Apr 20 06:47:08 fs Filesystem[9823]: [9890]: ERROR: Couldn’t unmount /var/lib/nfs; trying cleanup with SIGKILL
After some poking around the systems It looked like nfs was not showtdown cleanly. looking into the rc script i changed the signal from 2 to 9
From :
stop)
# Stop daemons.
echo -n $”Shutting down NFS mountd: ”
killproc rpc.mountd
echo
echo -n $”Shutting down NFS daemon: ”
killproc nfsd -2
echo
To :
stop)
# Stop daemons.
echo -n $”Shutting down NFS mountd: ”
killproc rpc.mountd
echo
echo -n $”Shutting down NFS daemon: ”
killproc nfsd -9
echo
and now, all is well 
Apr 20 06:52:49 fs Filesystem[8696]: [8754]: INFO: unmounted /var/lib/nfs successfully
searching the web shows this is a somewhat known issue
Check postgesql table size
Posted by admin
on March 23, 2009
No comments
Centos5: nfs clients get premission denied
Posted by admin
on February 18, 2009
No comments
While working on ny NFS cluster project , I could not mount my nfs exports from clients ( FreBSD & Centos ).
on the FreeBSD client I got these responses :
[udp] server:/data/dir1: Permission denied
on the CentOS client I got these responses:
mount: server:/data/dir1 failed, reason given by server: Permission denied
On the Centos NFS server the logs showed :
mountd[12377]: authenticated mount request from client1:984 for /data/dir1 (/data/dir1)
Turns out there’s a bug in CentOS and modprobe does not mount the nfsd procs , you can fix the issue by adding :
none /proc/fs/nfsd nfsd auto 0 0
to /etc/fstab
or manually ( if you want to make sure that is the issue ) :
/bin/mount -t nfsd nfsd /proc/fs/nfsd