我的环境：
# cat /etc/debian_version
9.8
# uname -a
Linux X 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3.1 (2019-02-19) x86_64 GNU/Linux
#
# systemctl --version
systemd 232
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN
#
# metricbeat version
metricbeat version 6.7.1 (amd64), libbeat 6.7.1 [1d55b4bd9dbf106a4ad4bc34fe9ee425d922363b built 2019-04-02 15:11:28 +0000 UTC]
#
我正在尝试使用systemctl标志--now，但遇到以下问题：
systemctl：
# systemctl --now enable metricbeat
Synchronizing state of metricbeat.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable metricbeat
# echo $?
0
# systemctl status metricbeat
● metricbeat.service - Metricbeat is a lightweight shipper for metrics.
Loaded: loaded (/lib/systemd/system/metricbeat.service; enabled; vendor preset: enabled)
Active: inactive (dead)
Docs: https://www.elastic.co/products/beats/metricbeat
#
但是，如果/当我仅使用 启动服务时systemctl start，服务将启动：
# systemctl start metricbeat
# echo $?
0
# systemctl status metricbeat
● metricbeat.service - Metricbeat is a lightweight shipper for metrics.
Loaded: loaded (/lib/systemd/system/metricbeat.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2019-04-10 20:08:40 UTC; 2s ago
Docs: https://www.elastic.co/products/beats/metricbeat
Main PID: 21369 (metricbeat)
Tasks: 10 (limit: 4915)
Memory: 9.9M
CPU: 167ms
CGroup: /system.slice/metricbeat.service
└─21369 /usr/share/metricbeat/bin/metricbeat -c /etc/metricbeat/metricbeat.yml -path.home /usr/share/metricbeat -path.config /etc/metricbeat -path.data /var/lib/metricbeat -path.logs /var/log/metricbe
Apr 10 20:08:40 X systemd[1]: Started Metricbeat is a lightweight shipper for metrics..
#
实际问题：
为什么--now不工作？我做错什么了吗？