因为要测试InfluxDB，看看Client查询了什么，就service influxdb stop停掉了influxDB，然后直接用influxd进程直接跑了，测试完之后，service influxdb start启动InfluxDB，发现查询很慢，且5分钟内无数据，重启了influxdb服务几次后，连show measurements都出不来结果了，journalctl -xe查看系统日志发现有一下信息
Apr 12 05:17:09 raspberrypi influxd[495]: [write] 2019/04/12 05:17:09 write failed for shard 21: [shard 21] open /var/lib/influxdb/wal/ServerMonitor/oneDay/21/_00003.wal: permission denied
原来是权限的问题，我手动执行influxd的时候用的是root账户，而influxdb服务运行时是以influxdb用户运行的，cd到/var/lib/influxdb/，给wal目录加写权限后，恢复正常。
pi@raspberrypi:~ $ cd /var/lib/influxdb/ pi@raspberrypi:/var/lib/influxdb $ ls -la total 20 drwxr-xr-x 5 influxdb influxdb 4096 Apr 5 02:14 . drwxr-xr-x 33 root root 4096 Apr 5 18:43 .. drwxr-xr-x 4 influxdb influxdb 4096 Apr 11 16:51 data drwxr-xr-x 2 influxdb influxdb 4096 Apr 12 00:37 meta drwx------ 4 influxdb influxdb 4096 Apr 11 16:51 wal pi@raspberrypi:/var/lib/influxdb $ cd wal/ -bash: cd: wal/: Permission denied pi@raspberrypi:/var/lib/influxdb $ sudo chmod 777 wal/ -R pi@raspberrypi:/var/lib/influxdb $ cd wal/ pi@raspberrypi:/var/lib/influxdb/wal $ ls -la total 16 drwxrwxrwx 4 influxdb influxdb 4096 Apr 11 16:51 . drwxr-xr-x 5 influxdb influxdb 4096 Apr 5 02:14 .. drwxrwxrwx 4 influxdb influxdb 4096 Apr 6 12:00 _internal drwxrwxrwx 5 influxdb influxdb 4096 Apr 7 07:01 ServerMonitor
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