telegraf和influxdb都是运行在docker 上面，influxdb没有显示http链接信息，以下是telegraf的日志：
# docker run -v /root/telegraf:/etc/telegraf/telegraf.conf -v /var/run:/var/run telegraf
2019-10-21T08:30:30Z I! Starting Telegraf 1.12.3
2019-10-21T08:30:30Z I! Using config file: /etc/telegraf/telegraf.conf
2019-10-21T08:30:30Z I! Loaded inputs: diskio kernel mem processes swap system cpu disk
2019-10-21T08:30:30Z I! Loaded aggregators:
2019-10-21T08:30:30Z I! Loaded processors:
2019-10-21T08:30:30Z I! Loaded outputs: influxdb
2019-10-21T08:30:30Z I! Tags enabled: host=d73cf0686f67
2019-10-21T08:30:30Z I! [agent] Config: Interval:10s, Quiet:false, Hostname:"d73cf0686f67", Flush Interval:10s
2019-10-21T08:30:30Z W! [outputs.influxdb] when writing to [http://127.0.0.1:8086]: database "telegraf" creation failed: Post http://127.0.0.1:8086/query: dial tcp 127.0.0.1:8086: connect: connection refused
2019-10-21T08:30:50Z E! [outputs.influxdb] when writing to [http://127.0.0.1:8086]: Post http://127.0.0.1:8086/write?consistency=any&db=telegraf: dial tcp 127.0.0.1:8086: connect: connection refused
2019-10-21T08:30:50Z E! [agent] Error writing to outputs.influxdb: could not write any address
2019-10-21T08:31:00Z E! [outputs.influxdb] when writing to [http://127.0.0.1:8086]: Post http://127.0.0.1:8086/write?consistency=any&db=telegraf: dial tcp 127.0.0.1:8086: connect: connection refused
2019-10-21T08:31:00Z E! [agent] Error writing to outputs.influxdb: could not write any address
2019-10-21T08:31:10Z E! [outputs.influxdb] when writing to [http://127.0.0.1:8086]: Post http://127.0.0.1:8086/write?consistency=any&db=telegraf: dial tcp 127.0.0.1:8086: connect: connection refused
2019-10-21T08:31:10Z E! [agent] Error writing to outputs.influxdb: could not write any address
为什么telegraf一直请求不到influxdb呢？这个煞笔问题我自己的锅，改一下telegraf配置ip地址就好了。
因为两个服务都是在在docker上运行的，所以telegraf请求的ip地址不能填localhost或者127.0.0.1。
需要填docker分配的地址或者本机的ip地址，建议选后者。
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