$ docker run -p 9880:9880 -v $(pwd)/tmp:/fluentd/etc fluent/fluentd:edge-debian -c /fluentd/etc/fluentd.conf
2021-03-16 09:11:32 +0000 [info]: parsing config file is succeeded path="/fluentd/etc/fluentd.conf"
2021-03-16 09:11:32 +0000 [info]: gem 'fluentd' version '1.11.5'
2021-03-16 09:11:32 +0000 [warn]: define <match fluent.**> to capture fluentd logs in top level is deprecated. Use <label @FLUENT_LOG> instead
2021-03-16 09:11:32 +0000 [info]: using configuration file: <ROOT>
2021-03-16 09:11:32 +0000 [info]: starting fluentd-1.11.5 pid=7 ruby="2.6.6"
2021-03-16 09:11:32 +0000 [info]: spawn command to main: cmdline=["/usr/local/bin/ruby", "-Eascii-8bit:ascii-8bit", "/usr/local/bundle/bin/fluentd", "-c", "/fluentd/etc/fluentd.conf", "-p", "/fluentd/plugins", "--under-supervisor"]
2021-03-16 09:11:33 +0000 [info]: adding match pattern="**" type="stdout"
2021-03-16 09:11:33 +0000 [info]: adding source type="http"
2021-03-16 09:11:33 +0000 [warn]: #0 define <match fluent.**> to capture fluentd logs in top level is deprecated. Use <label @FLUENT_LOG> instead
2021-03-16 09:11:33 +0000 [info]: #0 starting fluentd worker pid=16 ppid=7 worker=0
2021-03-16 09:11:33 +0000 [info]: #0 fluentd worker is now running worker=0
2021-03-16 09:11:33.025408358 +0000 fluent.info: {"pid":16,"ppid":7,"worker":0,"message":"starting fluentd worker pid=16 ppid=7 worker=0"}
2021-03-16 09:11:33.026503372 +0000 fluent.info: {"worker":0,"message":"fluentd worker is now running worker=0"}