Author Archives: SoCRaT

About SoCRaT

Systems Engineer, OSS & Linux Geek

How to change max open files for nginx server on Ubuntu

The following error occurred a lot in /var/log/nginx/error.log: Too many open files This means that the nginx master process reached the maximum number of open files which was set to the default of 4096. (To check it, simply cat /proc/pid/limits, … Continue reading

Posted in Linux, Ubuntu | Tagged , , , , , | Leave a comment

Add a new HDD to a VM without rebooting on Ubuntu server

Firstly, install scsitools package: sudo apt install scsitools Then run the command rescan-scsi-bus: sudo rescan-scsi-bus That’s it, your new virtual HDD has now been detected. Another way would be to do it with a loop and without the need for … Continue reading

Posted in Linux | Tagged , , , | Leave a comment

A cute little screenshot and annotation tool on Linux

A very handy screenshot tool that works very well on my KDE plasma desktop on Ubuntu 19.10 is ksnip, which you can get from here: Just download and install the deb file and that’s it! Enjoy!

Posted in Linux | Tagged , , , | Leave a comment

Restart network manager indicator in KDE Plasma Desktop

sudo service NetworkManager restart Note: This is specifically for the network icon in the system tray and is different from the network-manager service which controls the whole Linux network manager: Tested on Ubuntu 19.10 with KDE Plasma 5.16.5 Source:

Posted in Linux | Tagged , , | Leave a comment

Copy with rsync over ssh

From remote server to local one: rsync -avzhe ssh remote_user@REMOTE_IP:/remote_folder_or_file /local_destination_folder_or_file From local server to remote one: rsync -avzhe ssh local_folder_or_file remote_user@REMOTE_IP:/remote_destination_folder_or_file That’s it, Enjoy! Sources: Rsync (Remote Sync): 10 Practical Examples of Rsync Command in Linux

Posted in Linux | Tagged , , | Leave a comment

Build Synergy in Ubuntu 19.04

Synergy software, which shares your keyboard and mouse to multiple computers through the network, is no longer available in the Ubuntu 19.04 repos, so the only remaining option is to build it from source: sudo apt install qtcreator qtbase5-dev cmake … Continue reading

Posted in Linux, Ubuntu | Tagged , | Leave a comment

Fix icon and text size for hidpi displays on login screen in KDE on Ubuntu 19.04

Just create/edit the file /etc/sddm.conf and add the following: [X11] EnableHiDPI=true ServerArguments=-nolisten tcp -dpi 192 Reboot, and you’re good to go, Enjoy! Sources:

Posted in Linux | Tagged , , | 2 Comments