Setup CentOS 7

setup.md

Articles:

Steps taken from following guides:

• digitalocean
• tecmint
• install-docker

Download ISO

• http://isoredirect.centos.org/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-1810.iso

Install:

• Use the wizard

Network:

• $ nmcli d # check interface status
• $ nmtui # Open network manager. Edit your connection and make sure dhcp enable and "auto connect" selected
• $ nmtui-hostname # configure hostname
• $ ifconfig # check if dhcp works
• $ ip a
• $ ping -c2 google.com

OS

• $ yum check-update
• $ yum upgrade

Utils:

• $ yum install nano wget curl net-tools lsof bash-completion

Services:

• $ systemctl list-unit-files -t service

Remove Postfix (mailserver)

• $ systemctl stop postfix
• $ systemctl disable postfix
• $ yum remove postfix

SSH:

Ensure you have a non-root admin user configured and added to the wheel group (if you did not create if with the wizard)

• $ adduser <user>
• $ passwd <user-pass>
• $ usermod -aG wheel <user>

On your local machine, copy your ssh pubkey to the server

• $ ssh-copy-id <user>@SSH_SERVER_IP
• Test passwordless login with $ ssh <user>@SSH_SERVER_IP

Disable root login with ssh

• $ nano /etc/ssh/sshd_config
• set PermitRootLogin no
• $ systemctl restart sshd
• Test root ssh disabled $ ssh root@SSH_SERVER_IP

FIREWALL:

• $ yum install firewalld
• $ systemctl start firewalld
• $ firewall-cmd --permanent --add-service=ssh

DATE/TIME:

• $ timedatectl list-timezones
• $ timedatectl set-timezone region/timezone # timedatectl set-timezone Europe/Berlin
• $ timedatectl # test to see if timezone correct

NTP:

• $ yum install ntp
• $ systemctl start ntpd
• $ systemctl enable ntpd

DOCKER and COMPOSE:

Follow https://github.com/NaturalHistoryMuseum/scratchpads2/wiki/Install-Docker-and-Docker-Compose-(Centos-7)