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CentOS_Post_Install.md

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CentOS Minimal Server - Post-Install Setup logo

Some setup processes to get CentOS 6 or 7 ready to use after initial install

CentOS Minimal Server download is available from: http://isoredirect.centos.org/centos/7/isos/x86_64/CentOS-7-x86_64-Minimal-1511.iso

Network Setup

CentOS allows you to set the network up during the OS install, but sometimes you need to change it afterwards. CentOS 7 has a nice GUI you can use to do everything. CentOS 6 is a pain in the ass.

  1. CENTOS 7: Use the GUI editor to make interface changes (easy button)

     sudo nmtui

  2. CENTOS 6: Open the network configuration file for editing in VI (not easy button)

     sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0

  3. CENTOS 6: Modify and enter the below settings into the file (you have to hit "i" to enter edit/insert mode)

     IPADDR=192.168.1.100
 PREFIX=24
 GATEWAY=192.168.1.1
 DNS1=8.8.8.8
 DEFROUTE=yes
 IPV4_FAILURE_FATAL=yes
 IPV6INIT=yes
 IPV6_AUTOCONF=no
 IPV6_DEFAULTGW=2001:db8:1ce:1ce:babe::1
 IPV6ADDR=2001:db8:1ce:1ce:babe::100/64
 DNS2=2001:4860:4860::8888
 IPV6_DEFROUTE=yes
 IPV6_FAILURE_FATAL=yes
 NAME="System eth0"

  4. CENTOS 6: Hit ESC to exit edit/insert mode, then type in ":w" and hit ENTER to write the file

  5. CENTOS 6: Type in ":q" and hit ENTER to exit the editor

  6. CENTOS 6: Open the other network config file to set the default gateway and hostname (you have to hit "i" to enter edit/insert mode)

     sudo vi /etc/sysconfig/network

  7. CENTOS 6: Enter gateway and hostname info as below

     NETWORKING=yes
 HOSTNAME=CENT6
 GATEWAY=192.168.1.1
 IPV6_DEFAULTGW=2001:db8:1ce:1ce:babe::1

  8. CENTOS 6: Follow steps 4 and 5 above to save the file and exit the editor

  9. CENTOS 6: Open the other resolv.conf file to set the DNS servers and search domains

     sudo vi /etc/resolv.conf

  10. CENTOS 6: Enter DNS servers and search domain info as below

    search mydomain.com
nameserver 8.8.8.8
nameserver 2001:4860:4860::8888

  11. CENTOS 6: Follow steps 4 and 5 above to save the file and exit the editor

  12. Restart the networking stack to effect changes

    sudo /etc/init.d/network restart

Update the OS

It is always a good idea to update your OS with the latest patches when you build it

  1. Check repos for available updates

     sudo yum update -y

Install Useful Packages

These are some packages I install on almost everything

  1. Extra Packages for Enterprise Linux (EPEL) is an extensive database of useful and quality packages for RHEL-ish distro's. It automatically is seached by YUM once installed.

     sudo yum install epel-release -y

  2. Open VM Tools is an open version of the VMWare Tools app. Useful if on a hypervisor

     sudo yum install open-vm-tools -y

  3. A GIT client is a necessity if using a GIT repo

     sudo yum install git -y

Connect to SCP Share

We can use SSHFS to connect to another Linux box file system

  1. Install the SSHFS package

     sudo yum install sshfs -y

  2. Mount the local /mnt/ directory to a remote Linux machine

     sshfs [email protected]:/root /mnt