Server Management

Server Management NFS Mount Hangs: Diagnosis, Recovery and Safe Unmount Options

An unavailable NFS server can make harmless-looking commands such as df, ls or a monitoring probe block. The first recovery rule is to stop touching t...

Server Management SNMP Requests Arrive but No Response Is Sent

Seeing an inbound UDP/161 packet in tcpdump does not prove that the SNMP agent received or accepted it. The host firewall can still drop the packet, s...

Server Management Installing Apache Tomcat Server on Ubuntu

Apache Tomcat is a popular open-source application server used to run Java Servlet and JSP (JavaServer Pages) applications. In this guide, I will show...

General Problems Database Performance Issues and Solution Methods

Databases are critical for ensuring applications run fast and reliably. However, misconfigurations, limited hardware, inefficient queries, missing ind...

General Problems Security Vulnerabilities and Attacks: Server Threats and Solutions

Servers are constantly targeted by malicious attackers. Open ports, security vulnerabilities, and misconfigurations can all invite attacks. Remember, ...