Common steps before installing softwares on Linux

This article will cover some common setups before you can work or learn on Linux Platform.

Abstract

• setup IP address
• setup hostname
• turn off firewall
• host mapping
• JAVA_HOME setup
• setup ssh passwordless

Setup IP address

• run vi /etc/sysconfig/network-scripts/ifcfg-ens33

  • template

  • TYPE="Ethernet"
    PROXY_METHOD="none"
    BROWSER_ONLY="no"
    BOOTPROTO="static"
    DEFROUTE="yes"
    IPV4_FAILURE_FATAL="no"
    IPV6INIT="yes"
    IPV6_AUTOCONF="yes"
    IPV6_DEFROUTE="yes"
    IPV6_FAILURE_FATAL="no"
    IPV6_ADDR_GEN_MODE="stable-privacy"
    NAME="ens33"
    DEVICE="ens33"
    ONBOOT="yes"
    IPV6_PRIVACY="no"
    GATEWAY=192.168.157.2
    IPADDR=192.168.157.11
    NETMASK=255.255.255.0
    DNS1=192.168.157.2
    DNS2=1.2.4.8
    
    
    

  • systemctl restart network
  • ip a to check if ip is changed correctly
  • how to know ip address of GATEWAY?
    • VM edit tab -> Virtual Network Editor -> NAT -> Subnet IP

Setup Hostname

• vi /etc/sysconfig/network
• file template

  • NETWORKING=yes
    HOSTNAME=node01
    

Hostname mapping

• vi /etc/hosts
• add two new lines

  • 192.168.157.11 node01
    192.168.157.12 node02
    

Turn off firewall

• systemctl stop firewalld
• systemctl disable firewalld
• vi /etc/selinux/config
  • change SELINUX=disabled

Setup SSH Passwordless

• ssh localhost
  • verify if you need to setup password, if you need to input the password after running this command, then the passwordless is not setup correctly
• ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
• cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
• ssh localhost to verify if you don’t need password this time

JAVA_HOME setup

• get jdk from Oracle website
• upload jdk to linux VM
• tar -zxvf jdk -C /opt
• update /etc/profile
• some software only find /usr/java/default