[LRUG] VPS performance and monitoring

[George Palmer]

Most VPS have a policy where unused CPU time can be grabbed by other VM
users.  This means when other servers on the same host are quiet you get
more than your fair share.  This is a nice bonus but you should not plan on
having that available all the time.  We monitor steel time to get an idea
of how much it's happening:
http://blog.scoutapp.com/articles/2013/07/25/understanding-cpu-steal-time-when-should-you-be-worried

We had problems with DNS before after a Linode attack.  We now add Google's
DNS servers to our servers on setup.  I've just realised as I typed this
that you might be thinking the other way round.  We don't use our hosts DNS
service - use a dedicated company for that (we didn't find Linodes very
high quality and it's too important to risk).

George

On 4 March 2015 at 10:02, David Salgado <david at digitalronin.com> wrote:

> TL;DR - it's what you should expect.
>
> I've been hosting *lots* of VMs on several different hosting providers.
> We're currently on Rackspace, where we've been for a few years, but I look
> around fairly often.
>
> >> - We had some problem with other VPS'ese stealing cpu time from our
> VPS.
>
> I call this "VPS Weather" It's a fact of life when you're on a shared
> physical host with other people. There may be VM hosting companies who
> accurately limit resources so that one customer never gets an unfair share
> of the resources of physical host, but I've never found one (and I can't
> imagine why they would want to, from a business standpoint).
>
> >> - We had problems with DNS latency (we are talking seconds here)
>
> I haven't encountered this problem before, so it's possible it's something
> that DO suffer from, and others don't. However, the way our architecture
> works, we don't do many DNS lookups, so the fact that we haven't seen it
> doesn't really tell you much.
>
> >> Each time we found a problem they did not trap it in any kind of
> monitoring.
>
> Ditto. I always hear about problems from our own monitoring solutions long
> before I get alerts from the hosting company (if I ever get them). The
> lesson is to never skimp on your monitoring. It's also important to have
> monitoring that sits *outside* your hosted system, to pick up problems with
> their internet connectivity.
>
> David
>
>
>
> On 4 March 2015 at 09:40, Klaus Hebsgaard <klaus at hebsgaard.dk> wrote:
>
>> Hi
>>
>> I am the developer and siteOp for Be My Eyes.
>> Currently we host our site on Digital Ocean (DO) and we are pretty happy
>> with them, they even provided us with at lot of free hosting.
>> We have 2 load balancers, 3 web servers and 3 db hosts.
>>
>> However we have had a few issues with the VPS'ese on DO.
>>
>> - We had some problem with other VPS'ese stealing cpu time from our VPS.
>> - We had problems with DNS latency (we are talking seconds here)
>>
>> Each time we found a problem they did not trap it in any kind of
>> monitoring.
>>
>> So my question is: Is this what we should expect from VPS? Or are there
>> better alternatives out there?
>>
>> Med Venlig hilsen / Best regards
>>
>> Klaus Hebsgaard
>>
>> Website: http://www.hebsgaard.dk
>> Blog: *http://www.khebbie.dk <http://www.khebbie.dk>*
>> LinkedIIn: http://www.linkedin.com/in/klaushebsgaard
>> Github: https://github.com/khebbie
>>
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-- 
George Palmer
@georgio_1999
http://www.sendowl.com
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