systemctl服务启动失败

问题：systemctl命令daemon-reload无法加载到服务

解决：

先使用 sudo systemctl --failed 查看错误服务

UNIT               LOAD      ACTIVE SUB    DESCRIPTION
prometheus.service not-found failed failed prometheus.service

可以看到未加载，那么就使用daemon-reload加载

sudo systemctl daemon-reload
# 结果是成功加载
prometheus.service loaded failed failed Prometheus Monitoring System
# 之后启动服务
sudo systemctl start prometheus.service
# 如果不行，就使用restart启动就好了
sudo systemctl restart prometheus.service