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: /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: (root) MAIL (mailed 38 bytes of output but got status 0x007f from MTA#012)
Feb 10 13:10:35 ip-172..... CRON: (CRON) error (can't fork)
Feb 10 13:12:25 ip-172..... CRON: Module is unknown
Feb 10 13:13:36 ip-172..... cron: /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.
16 freelancers are bidding on average $123 for this job
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..
Howdy, please come online I'm interested in your project. Please send me a message so that we can discuss more. Thanks & Regards, Tanzil [url removed, login to view]