Automatically starting Oracle Enterprise Manager with chkconfig

Question

Folks,
While Oracle Linux 6 is out (6.2 actually), Oracle has yet to get everything 'working out of the box' with 6.2. Right now (June 2012) you've got to download patches from Oracle, the new way to start services in Linux 6, upstart, doesn't work with all Oracle features yet, etc. Update: You can still use chkconfig with OL6.
Because of the above, I've been using Oracle Linux 5.8. Linux 5 uses something called chkconfig to register services. You first need to put a script in the right directory: /etc/rc.d/init.d. Linux looks in this directory for scripts and runs those scripts with either a start or stop after them depending on if the system is coming up or going down. Technically this happens every time you change your runlevel (google Unix runlevels for more info), not just when the system goes up or down.
Here's a script that you can put in /etc/rc.d/init.d. I named mine oracleEM:
[root@localhost ~]# cd /etc/rc.d/init.d
[root@localhost init.d]# vi oracleEM
Enter i to enter insert mode and then enter the below (or just copy and paste it)
*#!/bin/sh*
*#chkconfig: 2345 80 05*
*#description: Oracle Enterprise Manager*
ORA_HOME=/u01/app/oracle/product/11.2.0/dbhome_1
ORA_OWNER=oracle
ORA_SID=orcl
*# We're checking to see if ps returns 1 or 2 results for pmon_orcl*
*# If there are two, Oracle is running, one we are just seeing our grep*
ORACLE_STATUS=$(ps -eaf | grep pmon_$ORA_SID | wc -l)
*if [ ! -f $ORA_HOME/bin/emctl ]*
then
echo "Enterprise Manager startup: cannot start"
exit
fi
case "$1" in
*"start")*
*if [ $ORACLE_STATUS -lt 2 ]*
then
echo "Waiting for Oracle instance $ORA_SID to start before starting Enterprise Manager"
fi
*while [ $ORACLE_STATUS -lt 2  ];do*
echo "Waiting...."
sleep 5
ORACLE_STATUS=$(ps -eaf | grep pmon_$ORA_SID | wc -l)
done
su - $ORA_OWNER -c "$ORA_HOME/bin/emctl start dbconsole"
*"stop")*
su - $ORA_OWNER -c "$ORA_HOME/bin/emctl stop dbconsole"
esac
Press the Esc key to leave insert mode, then type *:wq* to write the file and quit.
We'll need to make the script executable, so we need to run the following command:
[root@localhost init.d]# *chmod +x oracleEM*
Finally we need to register the oracleEM script with Linux using the chkconfig command:
[root@localhost init.d]# *chkconfig --add oracleEM*
Now Enterprise Manager will start up automatically when you start your system, but only after Oracle has started.
Rich
Edited by: RichS on Jun 9, 2012 1:00 AM

Answer 1

The script you are using will not work for RHEL or Oracle Linux since it is incorrect and missing important coding.
You can probably fix the script by removing the dash (-) from the su command and adding the lockfile that is required for RHEL to process the stop routine at system shutdown. The dash will reset the shell environment and the startup won't work. You should also start it in the background in order not to prolong the system startup more then necessary.
lockfile=/var/lock/subsys/oracleEM
start)
   su $ORA_OWNER -c "$ORA_HOME/bin/emctl start dbconsole &" &>/dev/null
   touch $lockfile
stop)
   su $ORA_OWNER -c "$ORA_HOME/bin/emctl stop dbconsole"
   rm -rf $lockfile
...You do not need to start your Oracle instance before starting dbconsole. So there is no need for the "sleep" routine. You can start the Oracle Database control console even when the instance is down:
For instance:
<pre>
[oracle@vm005 ~]$ ps -ef | grep pmon
oracle 17749 10343 0 22:48 pts/3 00:00:00 grep pmon
$ emctl start dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.1.0
Copyright (c) 1996, 2009 Oracle Corporation. All rights reserved.
https://vm005.example.com:1158/em/console/aboutApplication
Starting Oracle Enterprise Manager 11g Database Control ....... started.
</pre>