I like to automate the build of cloud servers using good-old shell scripts.
Here's a collection of commands I've found useful of the years...
Set the root password
echo -e "PASSWORD\nPASSWORD" | passwd
Set the hostname (helps to stop sendmail hanging)
hostnamectl set-hostname DOMAINNAME
Move over to CentOS Stream
yum -y install centos-release-stream
yum -y distro-sync
Install MySQL and run mysql_secure_installation
yum -y install mysql-server
service mysqld start
chkconfig mysqld on
EOF
Create some swap
fallocate --length 4GiB /swapfile
chown root:root /swapfile
chmod 0600 /swapfile
mkswap /swapfile
swapon /swapfile
echo '
/swapfile swap swap defaults 0 0
' >> /etc/fstab
Open up HTTP and HTTPS on firewalld
firewall-cmd --zone=public --permanent --add-service=http
firewall-cmd --zone=public --permanent --add-service=https
firewall-cmd --reload
Hide PHP from webserver headers
sed -i 's/expose_php = On/expose_php = Off/g' /etc/php.ini
Connecting via SSH to other systems - use sshpass
yum -y install sshpass
sshpass -p 'PASSWORD' SSHCOMMAND
Get Server external IP
curl -s icanhazip.com
Build a MySQL replica
Give the MySQL server a unique ID (base it upon the IP)
echo -n 'server_id = ' >> /etc/my.cnf.d/mysql-server.cnf
echo $(curl -s icanhazip.com) | tr . '\n' | awk '{s = s*256 + $1} END{print s}' >> /etc/my.cnf.d/mysql-server.cnf
