Setting up locally Jekyll Serve (Ubuntu)

Requirements:

sudo apt install ruby ruby2.3-dev zlib1g-dev build-essential
sudo gem install bundler

Create web virtual host on windows 2012

SSL Certificate

If the website enabled ssl, the SSL certificate is required. Follow Installing an SSL Certificate in Windows Server 2008 (IIS 7.0)

Change hostname and static IP on Centos 7

Change hostname

Edit file: /etc/sysconfig/network
```
HOSTNAME=servername.domain.com
```
Add the servername in /etc/hosts file
Run hostname command
```
sudo hostname servername.domain.com
```
Restart network service
```
sudo /etc/init.d/network restart
```

PHP extensions

Useful extensions:

php-xml php-gd php-curl php-mcrypt php-mbstring php-gettext

For mysql: php-mysql
For Apache2: libapache2-mod-php

My Blog Tips

Setting up locally Jekyll Serve (Ubuntu)
Setting up your GitHub Pages site locally with Jekyll
kramdown quick reference

Remove old kernels on Linux

Display current kernel

  $ uname -r
  $ uname -mrs

On ubuntu

List all installed kernels
```
$ dpkg --list | grep linux-image
```
Remove old kernels
```
$ sudo apt-get autoremove
```

Using ssh command to enable proxy server on Linux machine

The following command creates a proxy channel on linux server if logon success. The proxy server is localhost:1080.

ssh -D 1080 -C -N yourname@yourLinuxServer

Powerline for vim and bash prompt

Powerline is very cool status line for vim and easy to setup. It also supports shell prompt. But Powerline-shell is better for shell prompt because it can suppor version control information.

Linux System Monitor Commands

Checking service/process

SERVICE=lighttpd
if ps ax | grep -v grep | grep $SERVICE > /dev/null; then echo -n "\"$SERVICE\" : \"running\","; else echo -n "\"$SERVICE\" : \"not running\","; fi

Ubuntu proxy settings

For apt, software center etc

edit file /etc/apt/apt.conf

Acquire::http::proxy "http://username:password@host:port/";
Acquire::ftp::proxy "ftp://username:password@host:port/";
Acquire::https::proxy "https://username:password@host:port/";

Environment variables

edit file /etc/environment

http_proxy=http://username:password@host:port/
ftp_proxy=ftp://username:password@host:port/
https_proxy=https://username:password@host:port/