Mailcow-dockerized: Crashing Server after a day

[MineTech13]

Hello my server Crashes nerly every day when mailcow is running but when it is stoped my server dont crash pls help

[chriscroome]

My first guess would be a lack of RAM, check your logs to see if oom-killer is taking services out:

grep oom-killer /var/log/*

[MineTech13]

Server Specs:
CPU: 4x vCores 7199 MHz
RAM: 16GB
Hard Drive: 125GB HDD

[andristeiner]

On Debian? Which kernel version? Might be related to this one: https://github.com/moby/moby/issues/29397
I solved this by using kernel version 4.9 from Debian backports.

[stevesbrain]

Otherwise, bad RAM?

[jm3west]

Yes, I have got the same problem.
VPS-OS Debian 8 Jessie.

Overnight stop the server

[stevesbrain]

@jm3west - Possible to use your own kernel with that VPS provider I presume?

[jm3west]

My linux version/kernel is 3.16.0-4-amd64 ([email protected]) (gcc version 4.8.4 (Debian 4.8.4-1) ) #1 SMP Debian 3.16.43-2 (2017-04-30)

[stevesbrain]

@jm3west - yep, same kernel as referenced in the moby issue above. Does kernel 4.9 solve your issue?

[MineTech13]

okay iam not alone with the problem

[andryyy]

The solution is to upgrade the kernel. As mentioned in the docs. :)

Am 24.05.2017 um 14:54 schrieb Minners [e-mail]:

okay iam not alone with the problem

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[Ar1sC]

Im having problem upgrading to Kernel 4.9.....

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
linux-image-4.9.0-0.bpo.3-amd64 : Depends: linux-base (>= 4.3~) but 3.5 is to be installed
E: Unable to correct problems, you have held broken packages.

My Kernel Version 3.16.0-4-amd64

[Braintelligence]

Is the obvious solution to first upgrade to kernel 4.3 or am I misinterpreting things here?

[Ar1sC]

@Braintelligence Switched to Ubuntu 16.04. I couldn't find kernel 4.3.

[Braintelligence]

Strange, did you try googling your problem?

[Ar1sC]

I Did

[Braintelligence]

What happens if you follow this guide?

Please post errors.

http://www.ubuntumaniac.com/2015/12/install-linux-kernel-433-on-ubuntu-1604.html

[Ar1sC]

Thank's for your help but Im Already Working on Ubuntu....

[Braintelligence]

I don't understand your answer.
Using Ubuntu doesn't make you magically use a specific kernel.
You can update your kernel to a version of your liking as long as you follow the upgrade path and rely on official repositories.

[stevesbrain]

@Ar1sC Have you tried installing from these:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9/

If so, have you tried building from source instead?

[jm3west]

For Debian .....

echo "deb http://ftp.debian.org/debian jessie-backports main" >> /etc/apt/sources.list
apt-get update
apt-get install -t jessie-backports linux-{image,headers}-amd64

.... and have fun

[catcun]

I have the same Debian/Docker problem. I did upgrade the kernel but docker complained and I was not able to make it work; in the end I rolled back the VM. I will migrate the server to Ubuntu this weekend.

[chriscroome]

I haven't have any problems running Docker / Mailcow on Debian Stretch with linux-image-4.9.0-3-amd64 and with Docker installed following these instructions.

[Ar1sC]

@jm3west Yep. It's Working like a charm.
Tested on Debian 8.8.

[jm3west]

@Ar1sC, your welcome. My friend :-)

[Ar1sC]

@jm3west
echo "deb http://ftp.debian.org/debian jessie-backports main" >> /etc/apt/sources-list
Edit it to
echo "deb http://ftp.debian.org/debian jessie-backports main" >> /etc/apt/sources.list

you had a typo 👍

[jm3west]

ups, I'm sorry.

I've got change the mistake

[elvirdz]

@catcun
after kernel update on 4.9 you have to change docker on overlay2, aufs not work with 4.9 kernel
stop the docker and remove aufs from docker folder

[catcun]

@elvirdz
Thanks for the suggestion. I still have a VM on debian, I may try

[spacie2136]

Is anybody trying to fix this issue? I need and want to use Kernel 5.3. :-(

[andryyy]

This is not an issue anymore. Are you using Jessie with 5.3?

You don't need aufs. Use overlayfs.

[spacie2136]

I am using buster/sid with 5.3.0-1030-gcp. I got the problem that the server freezes after some days since i installed Mailcow.

[andryyy]

Okay, but there is really nothing I can do with this information. :(