title: prometheus: Failed to start Monitoring system and time series database
body: <p>I used official documentation to install prometheus on debian 10. i use prometheus and grafana to monitor ubuntu server 18.04. All works good.</p>
  <p>After one week, i restart my server and prometheus no longer work. when i restart prometheus service, i don't have error. when i ask status of prometheus service, i have this error:</p>
  <pre><code>root@srv-pg:/# systemctl status prometheus
  ● prometheus.service - Monitoring system and time series database
     Loaded: loaded (/lib/systemd/system/prometheus.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Wed 2021-02-17 16:38:19 GMT; 6min ago
       Docs: https://prometheus.io/docs/introduction/overview/
    Process: 2278 ExecStart=/usr/bin/prometheus $ARGS (code=exited, status=1/FAILURE)
   Main PID: 2278 (code=exited, status=1/FAILURE)
  Feb 17 16:38:19 srv-pg systemd[1]: prometheus.service: Service RestartSec=100ms expired, scheduling restart.
  Feb 17 16:38:19 srv-pg systemd[1]: prometheus.service: Scheduled restart job, restart counter is at 5.
  Feb 17 16:38:19 srv-pg systemd[1]: Stopped Monitoring system and time series database.
  Feb 17 16:38:19 srv-pg systemd[1]: prometheus.service: Start request repeated too quickly.
  Feb 17 16:38:19 srv-pg systemd[1]: prometheus.service: Failed with result 'exit-code'.
  Feb 17 16:38:19 srv-pg systemd[1]: Failed to start Monitoring system and time series database.
  root@srv-pg:/#
  </code></pre>
  <p>This is my config file of prometheus.yml:</p>
  <pre><code># Sample config for Prometheus.
  global:
    scrape_interval:     5s
    evaluation_interval: 5s
  rules_files:
  scrape_configs:
    - job_name: prometheus
      static_configs:
        - targets: ['localhost:9090']
    - job_name: node_exporter
      static_configs:
        - targets: ['192.168.62.4:9100']
    - job_name: nginx_exporter
      static_configs:
        - targets: ['192.168.62.4:9113']
  </code></pre>
  <p>I looked for the error but i don't see. Please help me.</p>