MailScanner under openvz

[Julian Field]

On 26/04/2010 01:13, Noel Butler wrote:
> Greetings,
>
> Has anyone had any issues with this configuration?
>
> I have installed MailScanner on many servers, personal, my employers, 
> and private clients over the years, must be totalling into hundreds 
> having used it since 2002, even on virtual stuff like xen and vmware, 
> but I've never had the displeasure of doing one under an openvz 
> container,  that said, this is my first hands on with openvz (no, I 
> don't control of the vps server hardware but I have faith in the 
> company that does as they have been doing this for a couple years, so 
> I trust the container and master host are properly setup).
>
> I know even an old pro like myself can make a mistake, so I duplicated 
> the setup on a spare dev box, and it works fine, but on that vps, not 
> a hope in hell...
>
> There are no errors in any lint/debug for MS or SA, forcing a 
> confiscated rootkit, gets found by clamav and dealt with correctly, so 
> I'm ruling out anti virus as well.
>
> Using base config of 5 children, It repeatedly restarts, it will 
> process mail in the process though, there are again, no indications as 
> to why it is restarting continuously.
>
>
> So I dropped the kids to "2" and it starts, all good as it should.
>
> 26227 ?        Ss     0:00 MailScanner: master waiting for children, 
> sleeping
> 26232 ?        S      0:02 MailScanner: waiting for messages
> 28345 ?        S      0:02 MailScanner: waiting for messages
>
> Except.. (yep there's always an "except")...
> Often, a child grabs the batch, then, the other kid grabs it, 
> processing it twice, resulting in the recipient getting two copies of 
> the message.
That's a locking fault.
>
> and.. then, if it restarts itself as per the restart timeout value, 
> they end up like this, trying to start a child, even though it already 
> has restarted itself and both of its kids (and we don't ever see 26227 
> return to master state.)
> 16328 ?        S      0:02 MailScanner: waiting for messages
> 18049 ?        S      0:02 MailScanner: waiting for messages
> 26227 ?        Ss     0:00 MailScanner: starting child
What happens if you put a message or two into mqueue.in and then 
"MailScanner --debug" ?
Does that produce any errors or warnings?

And what does your maillog say about the whole process? Any give-aways 
there?

>
>
> This is a centos 5.4 system.  MailScanner was installed from source 
> not an ancient rpm or whatever.
>
> CPU:     8 Intel(R) Xeon(R) CPU           E5450  @ 3.00GHz at 123MHz
> Memory:  512 MB
> Machine: x86_64
> Release: Linux 2.6.18-028stab068.3
>
>
> So, has anyone run into any problems like this with openvz?
>
> Cheers
> (thanks to Julian if he approves this post)
> (direct replies accepted) 

Jules

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Julian Field MEng CITP CEng
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