[Lxc-users] Many containers and too many open files

[Jäkel, Guido]

Dear Daniel,

What about to add little hints to such error messages; something like

	"Too many open files - failed to inotify_init. You may have to increase the value of  fs.inotify.max_user_instances"


And maybe this possible traps should be pointed out in the man page.


Another trap is a deficit of entropy, which may result into slow startup or freeze of containers (precise it's applications, e.g. the probably ever-present sshd)

	watch -n 1 cat /proc/sys/kernel/random/entropy_avail

To my experience on a typical server running a bunch of ssl-enabled daemons this happens quite often; I use  rngd  to avoid this.

Guido

>-----Original Message-----
>From: Daniel Lezcano [mailto:daniel.lezcano at free.fr]
>Sent: Tuesday, August 16, 2011 12:39 AM
>To: Gary Ballantyne
>Cc: lxc-users at lists.sourceforge.net
>Subject: [Spam-Wahrscheinlichkeit=45]Re: [Lxc-users] Many containers and too many open files
>
>On 08/15/2011 10:05 PM, Gary Ballantyne wrote:
>> On 16/08/11 06:52, Andre Nathan wrote:
>>> Hi Gary
>>>
>>> On Tue, 2011-08-16 at 06:38 +1200, Gary Ballantyne wrote:
>>>> Unfortunately, I am still getting the same errors with a little over 40
>>>> containers.
>>> I also had this problem. It was solved after Daniel suggested me to
>>> increase the following sysctl setting:
>>>
>>>    fs.inotify.max_user_instances
>>>
>>> HTH,
>>> Andre
>>>
>> Hi Andre
>>
>> That did it, thanks very much.
>>
>> With:
>>
>> echo 1024 > /proc/sys/fs/inotify/max_user_instances
>>
>> I can fire up (at least) 100 containers.
>
>FYI, maximum number of containers I reached was 1024 (the hard limit for
>the number of bridge ports). I did not try to run more.
>
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