# services running? systemctl –l status httpd.service tail -500 /var/log/httpd/error_log systemctl –l status aducid-aaa.service tail -500 /var/log/messages systemctl –l status tomcat9.service tail -500 /opt/tomcat/logs/catalina.out systemctl –l status postgresql-9.6.service # is there enough space? df –h # CPU status top