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Linux tips »

One of the server have problem with MySQL. The MySQL table cannot edit at all. Restart the MySQL does not resolve the issue.

It turn out that the problem come from tmp folder.

So stop the MySQL first.

Cpanel, Linux »

Recently there are few of our server overloaded because of Softaculous.
Not sure what trigger the overload but reinstall the software seem managed to solve the issue.
We have install our server with process monitoring script. When ever there are many process running exceeded define volume the notification will be sent to our report email.

Linux tips »

Recently one of server under my control infected with mining software. It cause unnecessary load and waste of server resource.
Since the server is using Cpanel, I must use WHM to track down the source. I check WHM ‘Process Manager’ and ‘Daily process log’ and found something similar like :
impxxxx impxxxxketing.com 98.5 -bash -a cryptonight -o stratum+tcp://xx.xx.xx.xx:14444 -u

Linux tips »

When using clusterssh sometime cannot connect to cssh due to recent upgrade.

gatekeeper@localhost:~> cssh
Connection to server failed — (version 11.0)
No protocol specified
at /usr/lib/perl5/vendor_perl/5.26.1/App/ClusterSSH.pm line 1983.
gatekeeper@localhost:~> echo $DISPLAY
:1

Linux tips »

This is simple guide on how to debug crash Centos server using kernel crash dump. The program we use is Kdump. When a kernel crash or kernel panic, the program will dump everything into a vmcore file for us to troubleshoot the cause of the crash. By analyzing the crash we could determine what is the root cause of the crash or we could send the crash dump to someone if we not familiar on how to read the dump file.