Basic CentOS 7 Installation

CentOS Distribution Install

Centos 7 minimal install from DVD install disk During install process:

• use custom formatting
• set partition type to 'standard'
• click on 'automatically create partitions
• delete /home partition and increase size of / to fill the disk
• set hostname (if known)
• enable all basic network interfaces (do not rename -- it will crash the installer)

Basic system prep

yum -y install net-tools rsync zsh epel-release yum-cron yum-utils mlocate deltarpm
yum -y install sshfs nfs-utils ssmtp
yum -y remove firewalld postfix
yum autoremove -y NetworkManager NetworkManager-libnm # only if not using as graphic workstation
systemctl enable yum-cron
systemctl start yum-cron
yum -y update

Disable SELinux (no comment)

sed -i 's/=enforcing/=disabled/g' /etc/selinux/config
setenforce 0

Reboot and verify everything comes up properly

reboot

System Configuration

Set the system hostname (if not set during installation)

hostnamectl set-hostname <hostname>.williams.localnet

Enable passwordless sudo:

• use visudo
• search for 'wheel'
• comment out that line
• uncomment the one below it

Set zsh as the default shell

• chsh to /bin/zsh (both root and ewilliam)
• copy ssh and zsh config files (both root and ewilliam)

scp -r calormen:.ssh .
scp calormen:.zshrc .
scp calormen:.zlogin . 

Setup backup to central file server

• copy scripts from calormen

scp calormen:/etc/cron.daily/backup /etc/cron.daily
scp calormen:/usr/local/bin/rsync_backup.sh /usr/local/bin/ 

• edit rsync_backup.sh, changing target directory and list of directories to backup
• create target directory on storage1 if it doesn't exist
• run /etc/cron.daily/backup to verify proper operation

Enable connection to the central log server

scp calormen:/etc/rsyslog.d/99-remotelog.conf /etc/rsyslog.d ; systemctl restart rsyslog

Enable mail to central mail server

echo "root: ewilliam@williams.localnet" >> /etc/aliases
echo "ewilliam: ewilliam@williams.localnet" >> /etc/aliases

enable references to non-williamsnet addresses for development cluster

scp aslan:/etc/hosts /etc/hosts