Sundaramurthy Blog

April 9, 2010

Oracle RAC ons process failed to start

Filed under: Oracle Cluster process — sundar5 @ 6:38 pm

In oracle RAC ( environment;  some time ons process will fail duo to localhost IP not fount in the /etc/hosts. It turned out to be local IP  address not in the hosts file.


Check the log file for ons process.
# cat /home/oracle/product/crs/log/dbnode-001/racg/ora.dbnode-001.ons.log

2010-04-09 10:08:08.608: [    RACG][2540801280] [32516][2540801280][ora.dbnode-001.ons]: onsctl: shutting down ons daemon …
Failed to get IP for localhost (1)
onsctl: shutdown of ons failed!


To solve this issue just insert the following line in your /etc/hosts file and started the crs localhost.localdomain localhost

# cat /home/oracle/product/crs/log/dbnode-001/racg/ora.dbnode-001.ons.log

2010-04-09 10:26:36.647: [    RACG][2540809472] [6819][2540809472][ora.dbnode-001.ons]: Adding remote host
{node =, port = 6200}
Adding remote host
onsctl: ons started


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