Friday, December 22, 2006

how to coerce OMSA 5.1 to install & run properly on CentOS 4 (part III)

Here is the summary of what I did for OMSA 5.1 on CentOS 4.1 ( the white-box twin of RHAS 4.1)

For installation, on a CentOS 4.1 without OpenIPMI or net-snmp, you just need to
  1. append /etc/redhat-release with "Nahant", RHEL 4's code name.
< CentOS release 4.1 (Final) Nahant --- > CentOS release 4.1 (Final)
2. start installation by running ./linux/suppportscripts/
After installation, answer NO to start start all services. Instead, conduct the following steps first:
1. insert a line 'test -e /dev/ipmi0 || mknod -m 0600 /dev/ipmi0 c 253 0' at the beginning of /etc/init.d/dsm_sa_ipmi. w/o it, /etc/init.d/dsm_sa_ipmi will fail miserablly. It seems that udev doesn't put /dev/ipmi0 back as expected.
22,24d21 < # my hack < test -e /dev/ipmi0 || mknod -m 0600 /dev/ipmi0 c 253 0 < #
2. insert '/etc/init.d/dsm_sa_ipmi start' at the beginning of 'start' section inside /usr/bin/srvadmin-
w/o it, start will fail with IPMI drivers fail to load. However, if you start IPMI manually by '/etc/init.d/dsm_sa_ipmi start', you'd be just fine.
241,243d240 < # my hack::ipmi failed to start when called from later this script < /etc/init.d/dsm_sa_ipmi start <
3. now start it all with /usr/bin/ start
4. verify it with ' omreport chassis temps' and 'omreport storage controller '. These two rely on different things to work. I'll elaborate on this later.

The rc scripts are placed in the S50 instead of their own start sequence number mandated in the scripts. I corrected them manually with my understanding of chkconfig directives in the scripts. However, I didn't get to change run level to test whether that would guarantee OMSA startup succesfully, since all my boxens are in production. Besides, Hobbit Monitor will let me know soon enough upon such failure.

It is such a great relief to have constant & comprehensive monitoring against critical systems. As a system engineer, you don't have to make all these mental or paper notes to check this or that. A decent NMS will do its job to nag you (whether you like or not) when necessary.

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