CentOS 7 Server

Prelude

This article is mainly to help experienced user install and setup CentOS 7 Server.

Prerequisites

• You are familiar with CentOS, at least you have some experience working on Linux system.
• You are familiar with basic bash/shell command

Things to do after installing CentOS server

• How to setup your server

Firewall setup

sudo firewall-cmd --permanent --add-port=22/tcp
sudo firewall-cmd --permanent --add-port=21/tcp
sudo firewall-cmd --permanent --add-port=80/tcp
sudo firewall-cmd --permanent --add-port=443/tcp
sudo firewall-cmd --permanent --add-port=8080/tcp

sudo firewall-cmd --reload

SSH server setup

!!! For production environment, SSH should be secured by the CA

• Install SSH if it is not done yet

## yum install openssh openssh-server openssh-clients openssl-libs

• Configure SSH

## backup default config 
sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.ori
sudo chmod a-w /etc/ssh/sshd_config.ori

## use any editor to update sshd_config 
sudo vi /etc/ssh/sshd_config 

## uncomment PasswordAuthentication yes to allow remote password login
## Password authentication is only for test environment

## setup ssh auto-start onboot
sudo systemctl restart sshd 

Update Time Zone if it is incorrect

ls -l /etc/localtime ## check the time zone

sudo timedatectl list | grep New_York ## find the time zone by the city
sudo timedatectl set-timezone America/New_York

Install Git

• Option 1: You can use yum to install git, but it is quite out-of-date. The version of git is 1.8.x

sudo yum install git
git --version

• Option 2: Download the latest stable release of Git and compile the software from source. (Recommended)

Install build tools

sudo yum groupinstall "Development Tools"

sudo yum install gettext-devel openssl-devel perl-CPAN perl-devel \
    zlib-devel libcurl-devel expat-devel

sudo yum install yum-utils

Download the latest release

wget https://github.com/git/git/archive/v2.x.x.tar.gz -O git.tar.gz
tar -zxf git.tar.gz
cd git-*
make configure
./configure --prefix=/usr/local
sudo make install
git --version

Setup a better Vim

sudo yum isntall vim-enhanced

Install Tmux

sudo yum install tmux

• Most useful tmux commands

Ctrl+b “ — split pane horizontally.

Ctrl+b % — split pane vertically.

Ctrl+b arrow key — switch pane.

Hold Ctrl+b, don’t release it and hold one of the arrow keys — resize pane.

Ctrl+b c — ©reate a new window.

Ctrl+b , — rename reate a new window.

Ctrl+b n — move to the (n)ext window.

Ctrl+b p — move to the (p)revious window.

Install python 3

You will only find Python 2 on CentOS by default. In order to install the latest python3, we need to install IUS to which stands for Inline with Upstream Stable.

sudo yum -y install https://centos7.iuscommunity.org/ius-release.rpm
sudo yum -y install python36u

### Install development package
sudo yum -y insall python-devel python36u-devel

Install nodejs

• Nodejs 6.x

sudo yum -y install nodejs

• Nodejs 8.x

curl --silent --location https://rpm.nodesource.com/setup_8.x | sudo bash -

• Upgrade NPM

sudo npm install -g npm
sudo npm install -g typescript
sudo mpm install -g yarn

install docker CE (CentOS 7)

## add repo
sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

## check docker.list
yum list docker-ce --showduplicates | sort -r

## install docker engine
sudo yum install docker-ce

docker -v 

Install JDK 8

• Downlaod the JDK from Oracle website.

## At the confirmation prompt, enter y 
## then RETURN to continue with the installation.
sudo yum install java-1.8.0-openjdk-devel


java -version

• Test JDK with a simple HelloWorld program

import java.util.Calendar;

class HelloWorld {
    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH) + 1;
        int day = cal.get(Calendar.DATE);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minute = cal.get(Calendar.MINUTE);
        String username = System.getProperty("user.name");
        System.out.println(username+ ": Hello World! ");
        System.out.println(year + "/" + month + "/" + day + " " + hour + ":" + minute);
    }
}

• Compile and run the program

javac HelloWorld.java
java HelloWorld.java

Install Go

• Install Go

cd /tmp
curl -LO https://redirector.gvt1.com/edgedl/go/go1.9.2.linux-amd64.tar.gz

## check hash
shasum -a 256 go*linux-amd64.tar.gz

## install tar ball
sudo tar -C /usr/local -xvzf go1.9.2.linux-amd64.tar.gz

• Setup GOROOT

cd /etc/profile.d
## Create a path.sh script
sudo vi path.sh

• Copy following code into path.sh

export PATH=$PATH:/usr/local/go/bin

• Setup local GOBIN, GOPATH

export GOBIN="$HOME/projects/go/bin"
export GOPATH="$HOME/projects/go/src"
export PATH

• Create a simple hello.go file to test

package main                                                        
                                                                    
import (                                                            
    "fmt"                                                           
    "log"                                                           
    "os/user"                                                       
)                                                                   
                                                                    
func main(){                                                        
    user, err := user.Current()                                 
    if err != nil {                                             
            log.Fatal(err)                                      
    }                                                            
    fmt.Printf(user.Name + " said : Hello World! \n" )            
}                                                                   

• Run the program

go run $GOPATH/hello.go
go install $GOPATH/hello.go
$GOBIN/hello

Install Cmake

sudo yum install epel-release
sudo yum install cmake3
sudo ln -s /usr/bin/cmake3 /usr/bin/cmake

Install Rust

curl -f -L https://static.rust-lang.org/rustup.sh -O
sh rustup.sh
rustc --version

Install PHP 7

• install and enable EPEL and Remi repository

sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
sudo yum install http://rpms.remirepo.net/enterprise/remi-release-7.rpm

• install yum-utils

sudo yum install yum-utils

• Enable PHP 7 repo

sudo yum-config-manager --enable remi-php72  

• Install PHP

sudo yum install php php-mcrypt php-cli php-gd php-curl php-mysql \
    php-ldap php-zip php-fileinfo 

Install clang

sudo yum install llvm
sudo yum install clang