The init daemon is the initialisation daemon first implemented in System V UNIX systems and has been around for over 40 years!
RedHat’s RHEL 7 and CentOS 7 introduces a replacement for init called systemd.
RHEL 6 (and CentOS 6) supported SysV init and Upstart with start and kill scripts created as links to scripts in /etc/rc.d/init.d scripts in the appropriate run level directory e.g. /etc/rc2.d.
And how old is Windows (Server version)? 23 years old.
UNIX is twice the age of Microsoft Windows (Server version)!
In its out of the box configuration you may find that CentOS Linux has iptables configured to prevent inbound HTTP requests.
You can add access for inbound HTTP requests on port 80 with the following command:
iptables -I INPUT 4 -p tcp -m state --state NEW -m tcp -dport 80 -j ACCEPTLine 4 of the iptables -L output now shows that http is allowed inbound from anywhere:
