This is the 1st series of articles highlighting the usage of MRTG for server and network monitoring.
In my previous article, I touched upon the basics of installing MRTG, Net-SNMP and used the cfgmaker tool to generate simple MRTG graphs. In this article, we further move on to the topic of creating MRTG graphs for a single Linux/Unix machine using only shell scripts.
The final goal or mission of these series of articles is to provide users concrete and professional examples of monitoring their servers and network devices using MRTG. In the end of these series of articles, we will round up and unite all these MRTG graphs to our web based network monitoring system called Nagios.
Posted in freebsd, linux, mrtg, snmp, solaris, technology, unix
Tagged linux, monitoring, mrtg, snmp, unix
In this article, we look into the topic of managing our users on our local Linux/Unix box. As we know it, Linux/Unix is a multiuser environment, therefore, one of the main tasks of a system administrator is to create user accounts and provide a secure environment for users to do their work in.
Adding and removing users is still one of the most important task of a system administrator. Therefore, we as system administrators need a good understanding of how the Linux/Unix accounting system works in order to provide good network services to our users and clients.
Good account management is also the key determinant to system security. Infrequently used accounts are prime targets for crackers. So are accounts with weak passwords.
Posted in freebsd, linux, network, security, technology, unix
Tagged blowfish, des, linux, md5, passwd, security, unix, user management
To be a good in system administration, we have to understand the basics of files, processes and permissions of our Linux/Unix hosts. Therefore, in this article, we will cover the basic stuffs regarding files, processes, permissions, the SUPERUSER “root” account and the sudo program.
Every file and process on a Linux/Unix system is owned by a particular user account. Every file has both an owner and a group owner. What this means is that the owner of the file enjoys one special property that is not shared with everyone on the system. This property is the ability to modify the permissions of the file.
Other users on the system can’t access files belonging to others without the owner’s permission, so this restriction helps protect a user’s files against “malicious” users!
This tutorial will guide you to create MRTG graphs for your Linux/Unix Server or just about any network device which supports SNMP.
This guide will present you the layout in a practical way and will not go in depth to explain the theories behind how they work. This is because the users will explore and learn them by themselves.
SNMP stands for Simple Network Management Protocol.