[Linux-HA] active active failover NFS server?

[Sebastian Reitenbach]

Hi list,

I am going to build an active active NFS server, where one exports a public 
directory, and the other the home directories. In case one fails, both 
should be exported by the remaining one server. 
I have a shared storage on a SAN, connected to both servers, I use the 
Filesystem ocf script to mount/umount the partitions (ext3, ocfs2 doesn't 
have ACL's, and I do not get GFS2 to work). Therefore I cannot run a nfs 
server clone, because I cannot umount the partition when the nfs server 
still lives on it, and the shared IP is wandering. I only see the LSB Script 
available for managing the nfsserver, but with the LSB script, only one NFS 
server can be started or stopped.


So I have to configure two NFS resources using the LSB script, so that both 
can life on different servers. But now when I manually tell on nfs resource 
to move to another server, then both nfs resources will not be available for 
a short time. I also saw some problems when a dead node comes back into the 
cluster, also both nfs server resouces were not available for a short time.

An other option would be to create a OCF script (I haven't found one) to 
manage the nfsserver. In the manual page of rpc.mountd I have seen that it 
is possible to specify a exports file and the port automatically. But I 
don't know what kind of other problems I might get, or whether it will be 
possible to run two nfsservers in parallel.

anybody has an idea?

kind regards
Sebastian