# service 상태 확인
systemctl status sample-app.service
# service 시작
systemctl start sample-app.service
# service 중지
systemctl stop sample-app.service
# service 재시작
systemctl restart sample-app.service
# service 부팅시 자동으로 시작하도록 등록
systemctl enable sample-app.service
# service 부팅시 자동시작 해제
systemctl disable sample-app.service
# service 상세정보 확인
systemctl cat sample-app.service
# check interfaces
ip link
# check DNS resolution
nslookup [target-ip-address]
# check connectivity
ping [target-ip-address]
# check route
traceroute [target-ip-address]
# check services
netstat -an | grep [target-port] | grep -i LISTEN
# check interfaces (again)
ip link