Trying to drop (delete) a MySQL database using CLI and the following error is returned? ERROR 6 (HY000): Error on delete of ‘./database//db.opt’ (Errcode: 13 – Permission denied) This is most likely due to permission issue on the database folder or a file within that folder. Have a look at the MySQL database folder using… Read More »
After updating ImageMagick to version 6.9.10.23+ from an earlier version, the following behavior occur : Thumbnails generation from PDF, XPS, PS, and EPS does not work anymore The following output can be found in the Web server error log : PHP Fatal error: Uncaught ImagickException: attempt to perform an operation not allowed by the security… Read More »
Here is an easy way to output in a single command the Apache memory usage and average process size : ps -ylC apache2 | awk ‘{x += $8;y += 1} END {print “Apache Memory Usage (MB): “x/1024; print “Average Proccess Size (MB): “x/((y-1)*1024)}’ This is particularly useful when you need to calculate proper process, max… Read More »
Attempting to use the SAR (sadc) command to lookup the historical system resources consumption metrics and got the following message? Cannot open /var/log/sysstat/sa27: No such file or directory Please check if data collecting is enabled Most likely data collecting is disabled (it is the default on several systems). You need to enable data collecting and… Read More »
Having the following error while importing a MySQL dump? phpMyAdmin – Error Incorrect format parameter Have a look at the “upload_max_filesize” value in your “php.ini” parameters. Most of the time, the dump file you are trying to import exceed that limit. Increase the value as needed.
If you changed the hostname/FQDN of a Linux server, you may end up with some issues, especially with mailing if some areas were forgotten with that change. Here is a quick procedure involving all the steps you should be looking for. (The following example is based on a Debian Linux system running Postfix MTA.) 1.… Read More »
OpenVPN enforce by default a 15 minutes lockout policy for unsuccessful login attempts. As an avid system administrator and used to end-user struggles, you most likely encountered many times situations where a user tried to log in 20 times and blaming you that it isn’t working (all that because they are entering the wrong password,… Read More »
Having the following login error attempting to establish a RDP session to a Windows server or workstation? The requested session access is denied. The following behavior apply to your case: The user you are using is a part of the Remote Desktop Users group (or allowed to the RDP users) The user is a non-administrator… Read More »
By default, OpenVPN has 15 minutes timeout lockout policy for consecutive unsuccessful authentication attempt (whatever you are using Local, PAM or LDAP authentication). If you want to change it to shorter or longer time period, follow these easy steps below : 1. Push the new timeout value to the configuration using this command (this example… Read More »
Experiencing the following error loading a Web site hosted on your cPanel server? 503 Service Unavailable And observing the following errors in the Apache logs : [proxy_fcgi:error] [pid 00000] [client 0.0.0.0:42284] AH01079: failed to make connection to backend: httpd-UDS [proxy:error] [pid 00000] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain… Read More »