项目场景：

安装完成Prometheus和Grafana后，安装alertmanager时遇到的问题

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问题描述

当直接cd到local文件夹下面使用./alertmanager命令可以成功运行alertmanager，但是设置开启自启动后，查看状态显示失败。

[root@Prometheus alertmanager]# vim /etc/systemd/system/alertmanager.service
[root@Prometheus alertmanager]# systemctl daemon-reload
[root@Prometheus alertmanager]# systemctl start alertmanager.service
[root@Prometheus alertmanager]# systemctl status alertmanager.service
● alertmanager.service - Prometheus Alertmanager
   Loaded: loaded (/etc/systemd/system/alertmanager.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since 四 2023-08-10 15:01:54 CST; 3min 20s ago
  Process: 41469 ExecStart=/usr/local/alertmanager/alertmanager --config.file="/usr/local/alertmanager/alertmanager.yml" (code=exited, status=1/FAILURE)
 Main PID: 41469 (code=exited, status=1/FAILURE)

原因分析：

原因发现config.file="/usr/local/alertmanager/alertmanager.yml"，中带有双引号，需要把双引号删除，即进行如下操作，找到loaded文件，上述日志提醒中有文件位置：

vim /etc/systemd/system/alertmanager.service

 修改配置文件如下

[Unit]
Description=Prometheus Alertmanager
After=network.target

[Service]
ExecStart=/usr/local/alertmanager/alertmanager --config.file=/usr/local/alertmanager/alertmanager.yml

[Install]
WantedBy=multi-user.target

 再次start

[root@Prometheus alertmanager]# systemctl daemon-reload
[root@Prometheus alertmanager]# systemctl start alertmanager.service
[root@Prometheus alertmanager]# systemctl status alertmanager.service
● alertmanager.service - Prometheus Alertmanager
   Loaded: loaded (/etc/systemd/system/alertmanager.service; enabled; vendor preset: disabled)
   Active: active (running) since 四 2023-08-10 15:07:54 CST; 11s ago
 Main PID: 41513 (alertmanager)
   CGroup: /system.slice/alertmanager.service
           └─41513 /usr/local/alertmanager/alertmanager --config.file=/usr/local/alertmanager/alertmanager.yml

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