On 11/10/2017 11:01 AM, Ron Wheeler wrote:
I have been using CentOS for a long time but they seem to have screwed
up the recent updates to CentOS 7 to the point where after updating to
the latest version (originally build 514 and now 683), the system no
longer boots. I have to boot to build 327 which runs fine.
The idea of having a server that fails after updating is not in my
comfort zone.
The other popular choice if you are using KVM on Linux is Ubuntu LTS.
The current LTS version is 16.04 which is supported until 2021.
Cloudstack runs fine on Ubuntu LTS, but configuring the network may be a
bit cumbersome for someone accustomed to the Centos
/etc/sysconfig/network-scripts mechanism.
In my experience over the years Ubuntu has not been quite as stable as
Red Hat Enterprise Linux, *but*, that may have changed with RHEL7/Centos
7, where they appear to break things regularly between minor version
updates in order to "improve" the system. I, too, ended up with the
issue of one of my Centos 7 servers not rebooting after an update, and
having to boot it back to an older kernel. I ended up re-formatting and
re-installing that server entirely and restoring the system
configuration from backups.
At this point I'd suggest remaining with KVM on Linux as your
hypervisor. It appears to perform better overall than Xen or vSphere and
the cost-effectiveness overall cannot be beat, especially if you are
buying hardware in bulk and using an automated mechanism to deploy your
hardware and the software load upon it so that you don't have to manage
it individually.
If you are looking for overall reliability (at a cost), vSphere is of
course "the" reliable choice (I have some ESXi hosts that have been up
for over 500 days, and the last time they went down was during a planned
outage to rearrange the racks), but it is very picky about its hardware
and likely won't like your current hardware. It can also become somewhat
expensive as you add hosts to your vSphere cluster, which is the basis
of a CloudStack pod (rather than the individual hosts). It's also as
much as 10% slower by my measurements under many workloads because they
make numerous decisions that improve reliability at the expense of
performance. Still, for customers that value reliability above all else,
vSphere is a brick -- reliable and pretty much bullet-proof.
