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Linux/Unix Server Monitoring HowTos

Monitor, protect, manage your Linux and Unix server. Learn how to monitor CPU, hackers, users, network, memory performance & disk availability with our tutorials & guides. ( rss feed ).

RedHat / CentOS Install and Configure Cacti Network Graphing Tool

Cacti is a network graphing tool similar to MRTG. How do I install and configure common options to collect SNMP data and various other data (such as system load, network link status, hard disk space, logged in users etc) into an RRD?
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Linux / UNIX Automatically Logout BASH / TCSH / SSH Users After a Period of Inactivity

My development and testing webserver is used by over 100s of users. These users login from Windows XP, Linux, Mac OS X system via ssh/putty client. How do I set or automatically log users out after a period of inactivity under RHEL/Fedora/CentOS Linux server to improve server security and save some resources?
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FreeBSD: Install bindgraph To Make Graphs About Queries Sent To BIND

How do I install bindgraph to make pretty query statistics about my BIND server running FreeBSD Unix operating system?
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Red hat / CentOS / Fedora Send Yum Package Update Notification Via Email

I know how to send package update email notification under Debian / Ubuntu Linux. How do I send Automatic Email Notification under RHEL v4/5, CentOS, Red Hat and Fedora Linux, when security & package updates available? How do I force yum to send an email when upgrades available?
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Linux Display Date And Time Of Login

How do I display user last login date and time under Linux operating systems?
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Solaris UNIX: Show Network Routing Table Information

How do I show networking routing table information under Solaris UNIX operating systems using a shell prompt?
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Linux / UNIX: Ping a Block of Hosts (netblock)

Q. How do I ping a block of hosts such as 192.168.1.0/24?
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Monitor ZFS Disk Space Storage Pool File System

How do I find and/or monitor disk space in your ZFS storage pool and file systems under FreeBSD or Solaris / OpenSolaris UNIX operating systems?
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Exim Remove All messages From the Mail Queue

Question: I’m using Exim mail server under CentOS Linux. How do I remove all messages from the Exim mail queue using a shell prompt?
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How To Reuse SSH Connection To Speed Up Remote Login Process Using Multiplexing

How do I reuse same ssh connection (Multiplexing) to speed up remote login procedure with OpenSSH client?
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