On 12/5/2012 2:52 PM, Ashish G wrote: > hi Experts, > I has few question on ccsd: > 1. what is the purpose of ccsd listening on ipv4 and ipv6 addresses as > follows in my 2 node HA setup? We do not use IPv6 in our setup. > > netstat -antp |grep ccsd > > tcp 0 0 0.0.0.0:50008 <http://0.0.0.0:50008> > 0.0.0.0:* LISTEN 18170/ccsd > > *tcp 0 0 ::1:50006 > :::* LISTEN 18170/ccsd* > > > ** > > *CCSD is invoked without any arguments: > * > > *root 18170 1 0 14:12 ? 00:00:00 /sbin/ccsd* > RFCs now mandates software to support both IPv6 and IPv4 and v6 has to be preferred when available. > > 2. Is it not sufficient to use IPv4 only by CCSD? For operational purposes yes, one protocol is enough, but we need to support both. > > 3. Sometimes on node reboot we see messages as follows: > > "Unable to bind to backend ipv6 socket, but inet_ntop returned NULL > pointer: Address already in use" > > Does anyone know when is this problem seen? No, it´s probably harmless. Does it create any runtime problem? I guess that the kernel ipv6 module is not loaded and bind fails. > > 4. If I invoke CCSD with "-4" option, will I get rid of the above > message? since ipv6 code path will not hit. > > *root 461 1 0 14:28 ? 00:00:00 /sbin/ccsd -4* > > netstat -antp |grep ccsd > > *tcp 0 0 127.0.0.1:50006 <http://127.0.0.1:50006> > 0.0.0.0:* LISTEN 461/ccsd* > > tcp 0 0 0.0.0.0:50008 <http://0.0.0.0:50008> > 0.0.0.0:* LISTEN 461/ccsd > Just try it, if you are not using v6, specifying -4 should be enough. Fabio -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
