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Disable systemd-resolved on Ubuntu/Deb/CentOS
systemd-resolved provide DNS resolver facility in newer version of Linux servers running systemd. I prefer manually editing /etc/resolv.conf and add resolvers. If…
Enable rc.local
To enable /etc/rc.local file run on system startup on servers runing systemd, you can run systemctl enable rc-local Now you need to…
Connecting to VNC Server from a Mac computer
On Windows and Linux there are many free open source VNC clients available. For Mac, if you google, most VNC clients are…
proxychains
proxychains allow you to route traffic using proxy servers. This is useful for routing traffic throihg applications that do not support proxy…
Delete LetsEncrypt SSL certficate
To list all available LetsEncrypt SSL certificates, run To delete a certificate, run You can find NAME_OF_SSL_CERT from the command “certbot certificates”.…
Nginx upstream sent too big header
When I log in to a PrestaShop website, I get an error on a Plesk server. 502 Bad Gateway On checking error…
Server Load
Here are some useful commands to check server load. iostat shows disk IO usage. %iowait shows how much time the process waits…
Find MySQL Database and Table Size
To find the size of databases using SQL command, run the following SQL in MySQL prompt. Example FInd disk usage by tables…
Show all formats supported by ffmpeg
To get list of video format supported by ffmpeg, run ffmpeg -formats Example See ffmpeg
Requesting a zone trasnfer with dig
To request a zone transfer using dig, use dig @NAME_SERVER_HERE -t AXFR DOMAIN_NAME_HERE Example [root@vps3 poweradmin]# dig @server10.hosthat.com -t AXFR bizhat.com ;…
mycomputer
These are some software/settings i have on my computer running Ubuntu 20.04 Steam store games on different Disk GNOME Shell Extension Install…