Isso deve funcionar no RHEL / CentOS 7
check process nginx with pidfile /var/run/nginx.pid
start program = "/bin/systemctl start nginx"
stop program = "/bin/systemctl stop nginx"
check process sshd with pidfile /var/run/sshd.pid
start program = "/bin/systemctl start sshd"
stop program = "/bin/systemctl stop sshd"