How To Yum Update To Specific Version
How to Yum update to specific version if we want to install update, but not the latest package. Sometimes we can not update to latest version and need some update…
How To Use Wget using Proxy Server
Wget is a free software package for retrieving files using HTTP, HTTPS, FTP and FTPS, the most widely used Internet protocols. It is a non-interactive commandline tool, so it may…
-bash: script.sh: /bin/sh^M: bad interpreter: No such file or directory
If you have problem when execute bash script, it’s caused by Windows environment and then porting over to run on a Unix environment. If you use Notepad++, go to Edit…
Nginx Virtual Host Traffic Status Module to Monitor Nginx
Nginx virtual host traffic status module (Nginx Module VTS) has lot of usefull monitoring for your open source Nginx server. Nginx Module VTS also can monitoring upstream status and request.…
Remove Nginx server header with Nginx Headers More Filter Module
This post will guide How to install and configure Nginx Headers More Filter Module and completely remove Nginx server header. For security reason, some times we need to remove all…
PHP Benchmark Maxmind Geolite2 vs IP2Location
This article is about simple benchmark Maxmind Geolite2 IP DB vs IP2Location IP DB. When we want to detect visitor city or country by IP, we can use free version…
How to Check TTFB (Time To First Byte) using CURL
Time to first byte (TTFB) is one of the many reasons why a website is fast or slow. Now, Google use website speed as SEO ranking factor. Google tells that…
How to install Xvfb and create systemd Xvfb service on CentOS 7 / 8 or RHEL 7 / 8
Xvfb or X virtual framebuffer is a display server implementing the X11 display server protocol. In contrast to other display servers, Xvfb performs all graphical operations in virtual memory without…
Auto renew Let’s Encrypt SSL Certificate using Systemd and restart Nginx / Apache if success
On other post, we create an article how to obtain Let’s Encrypt SSL Certificate on Centos 6/7/8 or RHEL 6/7/8. As we know, Let’s Encrypt SSL Certificate is expired in…
How to obtain Let’s Encrypt SSL Certificate for Apache or Nginx using Certbot
Now SSL is one of SEO (Search Engine Optimization) signal. Read it on Google Webmaster Blog. If you only has one or two websites, there is not a big problem.…
How to check UDP connection on Linux using Conntrack
This linux command line to check UDP connection on Linux using Conntrack command. If you want to exclude localhost, you can using grep
How to auto sync file to another server using Lsyncd on Centos 7
Lsyncd watches a local directory trees event monitor interface (inotify or fsevents). It aggregates and combines events for a few seconds and then spawns one (or more) process(es) to synchronize…