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> Isn't the Docker container all userspace with no kernel components? Yes but you still need a minimum kernel version to run Docker (2.6.32-431 or higher accor
by teh_klev 12y ago
> Isn't the Docker container all userspace with no kernel components?
Yes but you still need a minimum kernel version to run Docker (2.6.32-431 or higher according to [0]).
Earlier this year when we were exploring Docker, CentOS 6.4's latest kernel version didn't meet that requirement so Docker was a no-go. CentOS 6.5 was the min version with a supported kernel but our Citrix XenServer environment (6.2SP100) had no official vendor support for >=6.5. We don't run anything on our Citrix environments unless it's properly supported by them.
Now because of your comment and doing my fact checking, I just found out that CentOS 6.4's kernel is now at version 2.6.32-504 which is damn fine news for us. That said we'd still be stuck with CentOS 6.4 containers because CentOS 7 containers would still be unsupported by Citrix.
[0]: https://docs.docker.com/installation/centos/ https://docs.docker.com/installation/centos/