input tail plugin: tail file and pos fle are not exsits, when creating tail file, need restart td-agent?

[makeloffve]

I am trying use tail plugin to record log to mongo, but when starting td-agent(using docker), the log file is not exists and the pos file also does not been created. when i write record to log file, fluentd seems does not work. I run fluentd -c /fluentd/etc/fluent.conf -p /fluentd/plugins/ again, the fluentd does work.

here is my fluentd.conf:

<label @aiosplannet>
    <match **>
        @type mongo
        host 192.168.0.125
        port 27017
        database fluentd
        collection logs
          
        # for capped collection
        capped
        capped_size 1024m
        <buffer>
          # flush
          flush_interval 10s
        </buffer>
    </match>
    <match **>
        @type file
        @id   output2
        path         /fluentd/log/aios/data.*.log
        symlink_path /fluentd/log/aios/data.log
        append       true
        time_slice_format %Y%m%d
        time_slice_wait   10m
        time_format       %Y%m%dT%H%M%S%z
    </match>
</label>
<source>
    @type  tail
    @id input2
    tag @aiosplannet
    path /aios-data/logs/*
    exclude_path ["/aios-data/logs/api.log"]
    pos_file /aios-data/logs/log.pos
    refresh_interval 60s
    <parse>
        @type regexp
	expression ^(?<timestamp>[^\|]*)\s\|\s(?<level>\S+)\s(?<module>\S+)\s(?<hostname>\S+)\s(?<threadId>\S+)\s(?<user>\S+)\s(?<message>.*)$
    </parse>
    @label @aiosplannet
</source>

I need to run docker exec -ti fluentd sh -c "fluentd -c /fluentd/etc/fluent.conf -p /fluentd/plugins/" even when the container already runnig.