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Thursday, 29 October 2015

CentOS Data Protector agent unable to be installed

A customer asked me today for some help with a CentOS server that wouldn't install properly, despite everything looking OK.

The session went like this.

# ./omnisetup.sh -server cellmgr.ifost.org.au -install da,autodr
Cannot access the Cell Manager system (inet is not responding)....

As the cell manager was known to be working, we didn't need to check connectivity to 5555 on the cell manager. I suggested just running the installation (without the cell manager import first)

# ./omnisetup.sh -install da,autodr

This worked fine. Was the disk agent listening?

# netstat -an | grep 5555
tcp6   0   0   :::5555 :::*    LISTEN

That's odd: why IPv6? The cell manager had IPv6 disabled, so that would certainly have stopped things working.

# grep FLAGS /etc/xinet.d/omni
FLAGS = IPV6

That's that one explained... use your favourite editor (vi, nano, emacs, gedit...) to set FLAGS = IPV4 if you happen to encounter it. (Don't forget to run service xinetd restart )

But things still weren't working: CentOS has a host-based firewall. As we didn't have a media agent, the only relevant port is tcp 5555.

# firewall-cmd --add-port 5555/tcp --permanent
# firewall-cmd --reload

And then everything worked correctly.

Thanks to Glen Thompson for doing most of the work investigating this one!

Greg Baker is an independent consultant who happens to do a lot of work on HP DataProtector. He is the author of the only published books on HP Data Protector (http://www.ifost.org.au/books/#dp). He works with HP and HP partner companies to solve the hardest big-data problems (especially around backup). See more at IFOST's DataProtector pages at http://www.ifost.org.au/dataprotector