Useful Exim Commands with Examples
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix/Linux systems connected to the Internet. It is freely...
Category : System
Solaris OK prompt commands
What is OK Prompt? Most of the time, when you start the server with Solaris OS installed, it boots at run level 2 or run...
The difference between fork(), vfork(), exec() and clone()
Fork: The fork call basically makes a duplicate of the current process, identical in almost every way (not everything is copied over, for example, resource...
ELK Stack – Upgrade from 2.x to 5.x
Elasticsearch Snapshot and Restore https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-snapshots.html Elasticsearch Migration Helper Plugin cd /usr/share/elasticsearch/ ./bin/plugin install https://github.com/elastic/elasticsearch-migration/releases/download/v2.0.4/elasticsearch-migration-2.0.4.zip you may get updated command from here -> Elasticsearch Migration Plugin...
netstat – Find number of active connections in Linux using netstat
The “netstat” command is quite useful for checking connections to your machine. If we wanted to see ALL of the connections (which i really recommend...
Web Server Performance Tuning
First off, Apache, nginx, or LightSpeed aside – if you’re running a server with 1000-2000 requests/second it’s time to start thinking about dual servers and...
top command on multi core processor
top command shows CPU usage as a percentage of a single CPU by default. That’s why you can have percentages that are >100. On a system...
Windows – How to Kill hung service – Windows Service Which is Stuck
Sometimes as an administrator you may need to kill a service which is stuck in a ‘starting’ or ‘stopping’ state, in order to avoid having...