CentOS - Mar 2011 - respawning apache on centos

Hi 

I have a centos instance on a host where uname -a shows:

Linux cl28810.com 2.6.18-194.26.1.el5.028stab079.2PAE #1 SMP Fri Dec 17 
19:34:22 MSK 2010 i686 i686 i386 GNU/Linux

Periodically my ssh access and http access slow dramatically and I get out of 
memory when trying to do rudimentary stuff like ls. I've been advised by
tech
support to try service httpd restart. This works. But the first thing that 
happens after the command is issued is that the load goes up to about 15 then 
slowly declines to a more typical figure, in the range feom .1 to 1.3, which 
is fine. It takes several minutes before the site is really usable. I now have 
22 apache instances out of 66 total processes, which seems excessive.

One site hosted, running drupal 7, 1.5G RAM lots of disk spece, two cores, 
Xeon based host. I don't know if this is an apache issue or CentOS related
or
what.

Ideas? Debugging I can do?

Dave

-- 

?When facism comes to America it will be wrapped in the flag and carrying a 
cross.?

- Sinclair Lewis, It Can't Happen Here, 1935

centos-bounces at centos.org wrote:
> One site hosted, running drupal 7, 1.5G RAM lots of disk
> spece, two cores, Xeon based host. 
> I don't know if this is an apache issue or
> CentOS related or
> what.
My first recommendation: You could double (or quadruple) that RAM far
cheaper than talking about it.

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Dave Stevens wrote:
>
> Periodically my ssh access and http access slow dramatically and I get out
> of memory when trying to do rudimentary stuff like ls. I've been
advised by
<snip>
> is fine. It takes several minutes before the site is really usable. I now
> have 22 apache instances out of 66 total processes, which seems excessive.
>
> One site hosted, running drupal 7, 1.5G RAM lots of disk spece, two cores,
> Xeon based host. I don't know if this is an apache issue or CentOS
related
> or what.
>
> Ideas? Debugging I can do?
For one thing, I'd strongly urge you to add at least another .5G RAM, if
not 2.5G. Second, look at the apache configuration, and see how many
workers it can use - you might want to lower the limit.

Also, what's your connection to the 'Net like, and how heavily is your
website being hit?
>
> When facism comes to America it will be wrapped in the flag and
> carrying a cross.
>
> - Sinclair Lewis, It Can't Happen Here, 1935
It's happened here.

          mark

This is not CentOS, it's a compilation by your host built from changed 
CentOS sources. Your problem obviously is that you reach the limits of 
your VM. 1.5 GB of RAM should be enough for your 22 apache processes, so 
it is probably the CPU that is the bottleneck. Anyway, you have to talk to 
your provider, this is nothing CentOS-specific.

Kai

Greetings,

On 3/18/11, Dave Stevens <geek at uniserve.com>
wrote:
> Hi
>
> I have a centos instance on a host where uname -a shows:
>
> Linux cl28810.com 2.6.18-194.26.1.el5.028stab079.2PAE #1 SMP Fri Dec 17
> 19:34:22 MSK 2010 i686 i686 i386 GNU/Linux

I would suggest you look into the swap settings on both the Centos*
host and the Centos* guest.

Is swap stored on RAID0+1 etc.

Is the VM stored in LVM or on  filesystem, if any, which?

It is also difficult to make out if the 1.5G RAM you mentioned is
physically on the host or allocated to VM.

Having some such details would make an interest furtherance to this thread.

HTH

Regards,

Rajagopal