Db2 instance start failed with error SQL6048N
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After the IP address change on the machine, Db2 instance couldn't be brought up. The error received was:
The following messages are found in db2diag.log:
PID :1234 TID : <TID> PROC : db2start
INSTANCE: db2inst1 NODE : 000
FUNCTION: DB2 UDB, base sys utilities, sqle
DATA #1 : String, 12 bytes
host is down
DATA #2 : String, 60 bytes
DATA #3 : String, 9 bytes
To diagnose the problem, you can ping itself on the same machine by issuing "ping host2" command:
# ping host2
To resolve the problem, address the above error by correcting the IP address so that it is reachable on the machine,
for instance, verify the IP address is correct in /etc/hosts.
Once the machine is reachable, Db2 instance can be started.