自動起動を確認

$ sudo chkconfig --list httpd
httpd          	0:off	1:off	2:off	3:off	4:off	5:off	6:off

Linuxでのランレベル

$ sudo chkconfig httpd on
$ sudo chkconfig --list httpd
httpd          	0:off	1:off	2:on	3:on	4:on	5:on	6:off


$ sudo chkconfig httpd off
[ec2-user@ip-172-31-89-52 ~]$ sudo chkconfig --list httpd
httpd          	0:off	1:off	2:off	3:off	4:off	5:off	6:off


$ sudo yum -y update
$ sudo yum install -y httpd
$ sudo service httpd start