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Ubuntu webserver stop responding - Need helt troubleshooting and fixing

We have a web server running Ubuntu (16.04.3), nginx, mariadb, ISPConfig with Let's encrypt.

The server is running in AWS (Lightsail).

We've noticed that from time to time, the server stops responsing. It might then be unavailable for a few minutes, before it starts responding again. But we've also had to restart (power off) the server and then start it again quite often. During these problems, everything stops responding (ssh, web, ftp etc).

The only thing I can see from our syslog at the times it stops are some errors regaring:

Feb 10 13:10:08 ip-172..... cron[1128]: /usr/sbin/sendmail: error while loading shared libraries: libpostfix-util.so.1: failed to map segment from shared object

Feb 10 13:10:11 ip-172..... CRON[18077]: (root) MAIL (mailed 38 bytes of output but got status 0x007f from MTA#012)

Feb 10 13:10:35 ip-172..... CRON[18147]: (CRON) error (can't fork)

Feb 10 13:12:25 ip-172..... CRON[18161]: Module is unknown

Feb 10 13:13:36 ip-172..... cron[1128]: /usr/sbin/sendmail: Cannot allocate memory

This is a webserver with a number of live websites, so we should avoid downtime as much as possible during the troubleshooting/fixing. Looking for a Ubuntu expert that can help us out with this as soon as possible. Please let us know if you have additional questions.

Compétences : Services Web d'Amazon, Linux, Nginx, Administration Système, Ubuntu

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Concernant l'employeur :
( 3 commentaires ) Bergen, Norway

Nº du projet : #16268261

15 freelance font une offre moyenne de $116 pour ce travail

hariskhan1989

Hey, I can help you troubleshooting your AWS Ubuntu server right away... Contact me for more details. Regards, Haris Khan

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6.5
RaalFy

Hi There, I've read your project brief and established that your AWS server is timing out on requests and becoming unresponsive. I'll be happy to resolve these issues and stabilize the environment. But it seems tha Plus

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6.2
nikosku

Hello, my name is Nikos and I'm working on the Linux server administration field for the past 6 years. Over these years I worked for two web hosting companies as a Senior Administrator managing their servers & providi Plus

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6.2
yashaswini510

hello on the first glance, it looks like a memory issue.. the message "cant fork" means you have to upgrade the instance.. please message me back to discuss the details and get started..

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5.5
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5.7
sumitgarg44

From the logs it seems server is lacking RAM. Can debug more to see who is consuming more RAM

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4.8
cjconstante

Hi there! I am a system administrator security focused with 5+ years of experience working with servers, mostly Linux (Ubuntu and CentOS). I have read your concern and i can research into your server to detect and fix Plus

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5.0
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4.1
sandeepv76

Hi, I see you have severe memory issue, all memory consumed causing server to not responding. MariaDB consume all memory you have. I can configure MariaDB to consume less memory or create additional swap memory, bu Plus

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3.9
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3.8
axprof

Hello! Do you have ssh access to your server? I'll trobleshout it and make it as secure as possible. Regards, Alexander

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3.1
mekiho

Hi, Dear Employer. Thank you for reviewing my proposal. I've read your job detail with care. It is my business principle to keep the quality and speed of the product together and spare the efforts of the developer Plus

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2.8
LinuxSecurity

Howdy, please come online I'm interested in your project. Please send me a message so that we can discuss more. Thanks & Regards, Tanzil [login to view URL]

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2.6
AuspCluster

A proposal has not yet been provided

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0.0
junaidyounas2

Hello Can u come to chat section i n eed to check som stuff give me ssh so i can debug on my end and i will fix it in less than 15 min thanks

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