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I've been making my upgrades in lockstep with new releases - usually within hours of the code publication.

This time we've had several high-profile projects all at once, and I haven't had time to squeeze in the 7.6.5 to 7.7.0 upgrade.

Now 7.7.1 is out and I'm preparing to upgrade.

I'm probably just going to do it in steps with a backup in the middle, but is it OK to go straight from 7.6.5 to 7.7.1?

Yes, upgrade to 7.7.1 should be just fine.

You can upgrade directly to 7.7.1 from 7.6.5.  In fact, you should be able to upgrade to 7.7.1 from as far back as 2 full releases (currently meaning 7.5.x) with the only requirement being that the OS needs to be Cent6.

I know I've read that previously -- if fact I may have told someone that -- I've just never tried and suddenly got cold feet.

Of course I had to open my big mouth!

I got my first error on upgrade:

tsdb-server: unrecognized service

Upgrade aborted.
Please contact Aruba Networks Support at
1-800-WiFi-LAN or support@arubanetworks.com
DISABLED - 2!!
svn: The path '/root/svn/mercury' appears to be part of a Subversion 1.7 or greater
working copy.  Please upgrade your Subversion client to use this
working copy.

 On my way to TAC...

Subversion was upgraded, but that should be a seamless upgrade.  Try running 'svn upgrade' and then after that re-issue the start_amp_upgrade command.  Once the upgrade goes through, you can do 'amp_enable -now'.

Make sure you're in /root/svn/mercury when giving the 'svn upgrade' command.

"svn upgrade" is an "Unknown command"

Update perhaps?

The rest of the original error:

STEP 5: Installing upgrade.
tsdb-server: unrecognized service
	glibc = 2.12-1.80.el6_3.5 is needed by (installed) glibc-devel-2.12-1.80.el6_3.5.x86_64
make[3]: *** [security_patches] Error 4
make[3]: Leaving directory `/root/svn/mercury/src/x86_64/rpms/CentOS-6'
make[2]: *** [perllib] Error 2
make[2]: Leaving directory `/root/svn/mercury/src'
make[1]: *** [src_install] Error 2
make[1]: Leaving directory `/root/svn/mercury'
make: *** [upgrade] Error 2
make: Leaving directory `/root/svn/mercury'
tsdb-server: unrecognized service

subversion is at 1.6.11

did it miss an RPM?

[root@airwave mercury]# svn --version
svn, version 1.6.11 (r934486)
   compiled Jun 23 2012, 00:44:03

Looks like it missed a package.

This should do the trick

# yum install glibc

Then double check to verify the rpm package is there:

# rpm -qa | grep -i glibc

That got it, we're nearing completion now

We're up to RRDTool restart.

...

Starting SafeMigration

...

Installing kernel bits

...

Rebooting

Yay!

Much later, same problem going from 8.0.6.1 to 8.0.6.3 was resolved by updating glibc.  Oh, sweet irony, had to update glibc manually in order to update to 8.0.6.3 to resolve the ghost glibc bug.