yum update returns 'Illegal Instruction'
Running updates on some servers with
yum updatewould return
There is answer here:
And this works.
However, another fix for this is to update the xenserver tools package on these servers.
One server in particular here with this error was still running version 6.1 of the guest-tools package for xenserver guests!
Updating to version 7.1 of the utility, rebooting, then running updates again, you should see your available updates and should be able to update.
Good to know.