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Tracking centos server with bash script
In this article I will show you how to use bash shell to test the system periodically, to check the connection port 80, server load, queue exim, and mysql process … The script will automatically notify you via email if there are anything unusual. Script will use a while loop to run every 2 minutes and check whether the case…
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How to secure Apache HTTP Web Server
Apache HTTP Server is an open source web server developed by a community of developers and users, supported by non-profit corporation Apache Software Foundation. Apache web server is often placed at the edge of the server to serve httpd traffic hence it’s the most vulnerable service to an attack. Even though Apache has a good history about security, it does…
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Tips – Tricks
Browse web in linux via terminal with w3m and xterm
I’m going to show you some neat tricks to browse internet via Linux terminal. We are going to use w3m which is a free software and open source text based web browser which you can browse internet by using Terminal. w3m supports tables, frames, color and inline images on compatible terminals. The name w3m stands for “WWW wo miru (WWWを見る?)”,…
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Uncategorized
Linux file system structure
Linux Operating System and Linux File System are totally different from Microsoft Windows. In Microsoft Windows, you usually see Windows is installed in C:\ drive. In Linux, the Filesystem Hierarchy Standard (FHS) defines the structure of file systems on Linux and other UNIX-like operating systems, everything is configured as a file including directories, partitions, and hardware device drivers. All files…
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CentOS
How to install OpenVPN Access Server OpenVPN-AS on CentOS 6
OpenVPN is an open source software which let you tunnel any IP subnetwork or virtual ethernet adapter over a single UDP or TCP port. Similar to Microsoft’s VPN protocol, OpenVPN also supports L2TP/IPsec and SSTP (many VPN businesses still using old flawed PPTP protocol). OpenVPN comes with two versions Access Server and community version. There are few differences between OpenVPN…
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CentOS
How to install fail2ban on CentOS 6 and 7
I will show you how to install fail2ban on centos 6 and centos 7 to protect SSH brute force attacks. There are many ways to protect SSH server, the best way is to use ssh-keys authentication rather than regular password authentication. I have also written a long detailed article How to install, config and secure openssh server. In that article I have shown…
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CentOS
How to install LEMP web server with Nginx, PHP-FPM 5.6, MySQL 5.5 on Centos 7
Nginx is one of the most popular web server widely used by many popular websites like facebook, intel, cloudflare, hulu, netflix, dropbox, and more. Unlike Apache web server, nginx is a very light weight web server and proxy server yet comes with the same or even better features. Nginx does not create new process for each http request like Apache…
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Uncategorized
How to install Webmin on CentOS 7
I have upgraded some of my systems from Centos 6 to Centos 7. There are many new features in Centos 7 that Centos 6 does not have, but the way Centos 7 work is sort of different from Centos 6. Back to our topic, I’m going to show you how to install Webmin on Centos 7 / RHEL 7. Webmin is…
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CentOS
How to upgrade from CentOS 6 to 7
CentOS 7 was released few months ago which I was very excited, but I have been waiting for a while for bugs fixing. Usually when any Linux distro is released, they usually comes with unknow bugs which may break your system. CentOS is always my favorite linux distro since it’s a very stable distro, and CentOS is basically RHEL (Red…
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Security
How to create and install self-signed SSL certificate on Nginx in CentOS 6
Google starts to love https from months back and recommends all websites to be encrypted with SSL over HTTP. Rumor said google gives higher rank to those websites have https than websites without ssl. If you have budget, go ahead and buy signed certificates comodo, geotrust, thawte, godaddy, symantec, etc… If you just want to have SSL for testing servers…