systemd registra todas as mensagens (startup / stop) para / var / log / message usando syslog, a linha de erros que você vê é basicamente todas as linhas correspondentes para "nginx" com a opção tail. É algo = ~ grep nginx | tail
que exibirá as últimas 10 linhas da mensagem / var / log / para "nginx" grep. Basicamente, o systemctl exibe as últimas 10 linhas do log para ajudar o usuário a identificar o problema.
[root@puppetmaster ~]# grep nginx /var/log/messages| tail
Jul 1 05:59:50 localhost systemd: [/usr/lib/systemd/system/nginx.service:13] Failed to parse kill mode, ignoring: mixed
Jul 1 05:59:57 localhost systemd: [/usr/lib/systemd/system/nginx.service:13] Failed to parse kill mode, ignoring: mixed
Jul 1 06:05:35 localhost systemd: [/usr/lib/systemd/system/nginx.service:13] Failed to parse kill mode, ignoring: mixed
Jul 1 06:23:30 localhost systemd: [/usr/lib/systemd/system/nginx.service:13] Failed to parse kill mode, ignoring: mixed
Jul 1 06:23:34 localhost systemd: [/usr/lib/systemd/system/nginx.service:13] Failed to parse kill mode, ignoring: mixed
Jul 1 06:23:46 localhost systemd: [/usr/lib/systemd/system/nginx.service:13] Failed to parse kill mode, ignoring: mixed
Jul 1 06:27:07 localhost systemd: [/usr/lib/systemd/system/nginx.service:13] Failed to parse kill mode, ignoring: mixed
Jul 1 06:27:19 localhost systemd: [/usr/lib/systemd/system/nginx.service:13] Failed to parse kill mode, ignoring: mixed
Jul 1 06:27:24 localhost systemd: [/usr/lib/systemd/system/nginx.service:13] Failed to parse kill mode, ignoring: mixed
Jul 1 06:27:28 localhost systemd: [/usr/lib/systemd/system/nginx.service:13] Failed to parse kill mode, ignoring: mixed