Existing OEM 12c Agent Fails Startup and Resecure on Hostname Change

Had an issue where the hostname (on Oracle Enterprise Linux 5.9 – OEL 64-bit) happened to have an incorrect hostname and alias when I had already installed the OEM 12c (12.1.0.3) Agent. Thus the OMS repository targets were all named incorrectly, even though the Agent was secured and registered. (This was a new database host).

In the $AGENT_HOME/sysman/log/emagent.nohup log was the following:

— EMState agent
—– Sat Mar 1 10:42:22 2014::10437::Auto tuning the agent at time Sat Mar 1
10:42:22 2014 —–
—– Sat Mar 1 10:42:23 2014::10437::Finished auto tuning the agent at time Sat Mar 1 10:42:23 2014 —–
—– Sat Mar 1 10:42:23 2014::10437::Launching the JVM with following options: -Xmx128M -server -Djava.security.egd=file:///dev/./urandom -Dsun.lang.ClassLoader.allowArraySyntax=true -XX:+UseLinuxPosixThreadCPUClocks -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:+UseCompressedOops —–
—– Sat Mar 1 10:42:23 2014::10491::Time elapsed between Launch of Watchdog process and execing EMAgent is 2 secs —–
—– Sat Mar 1 10:42:23 2014::10437::Agent Launched with PID 10491 at time Sat Mar 1 10:42:23 2014 —–
2014-03-01 10:42:23,962 [1:main] WARN – Missing filename for log handler ‘wsm’
2014-03-01 10:42:23,971 [1:main] WARN – Missing filename for log handler ‘opss’
2014-03-01 10:42:23,972 [1:main] WARN – Missing filename for log handler ‘opsscfg’
OMS decided to shutdown the agent because of the following reason sent from OMS: EM_PLUGIN_MISMATCH_AND_AGENT_NOT_YET_MANAGED
—– Sat Mar 1 10:42:37 2014::10437::Checking status of EMAgent : 10491 —–
—– Sat Mar 1 10:42:37 2014::10437::EMAgent exited at Sat Mar 1 10:42:37 2014 with return value 0. —–
—– Sat Mar 1 10:42:37 2014::10437::EMAgent was shutdown normally. —–

./emctl secure agent

./emctl start agent

Resulted in the same repeating failures.

Removed the Target Host and Agent from OEM 12c OMS

(Target -> Hosts -> (select host) -> [Remove], and then,

Setup -> Manage Cloud Control -> Agents -> (click on Agent:(port)

Agent Menu (upper-left dropdown) -> Target Setup -> Remove Target)

Re-deployed using the faster method of silent Agent deployment (Bobby Curtis has this covered on http://dbasolved.com/2013/04/10/install-oem-agents-silently-in-any-environment )

Everything ready to proceed again.

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