How to Install and Setup Munin on CentOS 7

Munin is open source and free software for monitoring computer system, network monitoring and application infrastructure monitoring software. Munin offers monitoring and alerting for servers, switches, applications, and services. Munin can help system administrators to analyze the trend of the computer system whether it is experiencing problems or not. It can be an easier alternative […]

NGINX DDos Attack Tutorial – Implement Basic Protection

DDoS attacks are usually intended to paralyze websites and web services and it is better to mitigate it at the firewall level. But for the web server that runs on Nginx, I have prepared a basic step to provide DDoS protection which proved to work for small-scale DDoS attacks and DDoS attacks that aimed at […]

How to Add Linux Swap Space on CentOS 6 VPS

I have a virtual private server (VPS) and plans to run a WordPress blog in it. A limited amount of RAM and swap size will be an issue because some software applications like MySQL, Apache, NGINX, PHP, HHVM and Varnish requires more memory to operate. From my past experience in Ubiquity Hosting and Linode, the […]

How to Setup Sar (Sysstat) – Monitor Linux System Performance

Sysstat contains various utilities to collect and historize performance and monitor server activity on the linux. Sar is part of the sysstat package. by using sar, we can collect, report, or save system resource utilization information. It will help system administrator to troubleshoot performance issues, or to optimize performance. This post will show how to […]

How to Check Disk Read Write Speed in Linux

Measuring sequential disk performance is easy in linux as every modern Linux distribution comes with a command line utility called hdparm. Hdparm is a free tool to measure sequential disk performance which is primarily used to tune and optimize disk parameters. It is important to read hdparm man page and perform full backup before using […]

How to Fix “-bash: hdparm: command not found” on Linux CentOS 6.3

Question: When i try to run hdparm command to check to check the hard drive read and writing speed, the following error has been returned. Hdparm is a command line utility to measure sequential disk performance which is primarily used to tune and optimize disk parameters. Hdparm is free software under the BSD license. [root@centos63 […]

How to Check Realtime RAM Memory Usage Available in Linux VPS

On the previous post, i have teach you on how to check the memory usage on linux virtual Private Server (VPS) but only top command had provide real-time information and updates . This quick post will covers on how to check realtime RAM memory usage available in Linux VPS using watch command. Watch runs command […]

4 Top Command Howto on Linux RHEL 6/CentOS 6

In this article, i will help you to explore most frequently used top commands that linux system administrator use when analyzing the linux performance and use for daily system administrative jobs. Top command displays system summary information such as tasks currently being managed by the Linux kernel, displays ongoing look at processor activity in real […]

How to Check Swap Space/Memory/Size on Linux VPS Server

Linux uses swap space as a back up to its physical memory with an overflow area. Swapping is necessary for two important reasons. First, when the system requires more memory than is physically available, the swap space will gives memory to the current application (process) that needs the memory immediately. Second, a significant number of […]

How to Install sysstat on CentOS 5.7 Linux Server

In this post i will show how to install sysstat on Linux CentOS 5.7 server. Sysstat package is on of the method to monitor the linux server. sysstat package contains the sar, iostat and mpstat which are the system performance tools for Linux operating system. The sar command collects and reports system activity information. The […]

How to Check Memory and I/O with vmstat on Linux CentOS 5/CentOS 6/RHEL 5/RHEL 6 server – System Performance

vmstat command is a utility that will provides interesting information abaout processes, memory, i/O and CPU activity. When you run vmstat utility command without any arguments, you will see the output as below. This post will guide you on how to check memory and I/O with vmstat on Linux CentOS 5/CentOS 6/RHEL 5/RHEL 6 server […]

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