John the Ripper is a program for recovering passwords from their hashes.
Continue reading “Installing and using john on Linux”Category Archives: Linux
How to install osTicket on Ubuntu
osTicket is a popular open source application system.
For example, I will install osTicket on Ubuntu 18.04.
Continue reading “How to install osTicket on Ubuntu”Installing and using WPScan on Linux
WPScan – a utility for testing WordPress, searching for vulnerabilities.
Continue reading “Installing and using WPScan on Linux”How on Linux to learn the process PID and terminate it
On Linux operating systems, each process has its own identifier (PID).
We list all the processes and look at their PID:
Continue reading “How on Linux to learn the process PID and terminate it”How to solve “Suspicious process running under user” and “Excessive resource usage”
Sometimes some necessary processes use a lot of resources on the server and the system often starts to notify about it by email.
For example, as in my case, after installing the Zabbix agent, notifications began to come:
How to solve “LFD: Excessive resource usage”
Somehow I noticed errors coming to the mail from cPanel:
Continue reading “How to solve “LFD: Excessive resource usage””IPTables rules for SNMP
In this article, I will give an example of IPTables rules for SNMP.
Let’s say “iptables -P INPUT DROP” is the default, which is very desirable.
Configuring SNMP Traps on Linux
Here is an example of installing SNMP and catching SNMP traps in Ubuntu Server.
Continue reading “Configuring SNMP Traps on Linux”Backup to Yandex disk
I will give an example of a script for creating backup copies to Yandex drive.
Continue reading “Backup to Yandex disk”cPanel. Solving the Failed to find user “” from expanded string
Once on the same server as cPanel, after changing the settings in the WHM menu “Server Configuration” – “Settings”, email stopped working, I found the following error in the logs:
Continue reading “cPanel. Solving the Failed to find user “” from expanded string”