Use latest fluentd image by edge-debian

Signed-off-by: Kentaro Hayashi <kenhys@gmail.com>

Author: kenhys

container-deployment/install-by-docker.md

@@ -13,10 +13,10 @@ Please download and install [Docker](https://www.docker.com/) from here:
 
 ## Step 1: Pull Fluentd Docker Image
 
-Then, download Fluentd v1.6-debian-1's image by `docker pull` command:
+Then, download Fluentd edge-debian's (edge-debian means latest version of Fluentd) image by `docker pull` command:
 
 ```text
-$ docker pull fluent/fluentd:v1.6-debian-1
+$ docker pull fluent/fluentd:edge-debian
 ```
 
 Debian and Alpine Linux version is available for Fluentd image. Debian version is recommended officially since it has [`jemalloc`](https://github.com/jemalloc/jemalloc) support. However, the Alpine image is smaller.
@@ -42,9 +42,11 @@ To make the test simple, create the example config below at `$(pwd)/tmp/fluentd.
 Finally, you can run Fluentd with `docker run` command:
 
 ```text
-$ docker run -p 9880:9880 -v $(pwd)/tmp:/fluentd/etc -e FLUENTD_CONF=fluentd.conf fluent/fluentd:v1.6-debian-1
-2019-08-21 00:30:37 +0000 [info]: parsing config file is succeeded path="/fluentd/etc/fluentd.conf"
-2019-08-21 00:30:37 +0000 [info]: using configuration file: <ROOT>
+$ 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>
   <source>
     @type http
     port 9880
@@ -54,14 +56,15 @@ $ docker run -p 9880:9880 -v $(pwd)/tmp:/fluentd/etc -e FLUENTD_CONF=fluentd.con
     @type stdout
   </match>
 </ROOT>
-2019-08-21 00:30:37 +0000 [info]: starting fluentd-1.6.3 pid=6 ruby="2.6.3"
-2019-08-21 00:30:37 +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"]
-2019-08-21 00:30:38 +0000 [info]: gem 'fluentd' version '1.6.3'
-2019-08-21 00:30:38 +0000 [info]: adding match pattern="**" type="stdout"
-2019-08-21 00:30:38 +0000 [info]: adding source type="http"
-2019-08-21 00:30:38 +0000 [info]: #0 starting fluentd worker pid=13 ppid=6 worker=0
-2019-08-21 00:30:38 +0000 [info]: #0 fluentd worker is now running worker=0
-2019-08-21 00:30:38.332472611 +0000 fluent.info: {"worker":0,"message":"fluentd worker is now running worker=0"}
+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"}
 ```
 
 ## Step 3: Post Sample Logs via HTTP
@@ -77,10 +80,10 @@ Use `docker ps` command to retrieve container ID and use `docker logs` command t
 ```text
 $ docker ps -a
 CONTAINER ID        IMAGE                          COMMAND                  CREATED              STATUS              PORTS                                         NAMES
-775a8e192f2b        fluent/fluentd:v1.6-debian-1   "tini -- /bin/entryp…"   About a minute ago   Up About a minute   5140/tcp, 24224/tcp, 0.0.0.0:9880->9880/tcp   tender_leakey
+775a8e192f2b        fluent/fluentd:edge-debian   "tini -- /bin/entryp…"   About a minute ago   Up About a minute   5140/tcp, 24224/tcp, 0.0.0.0:9880->9880/tcp   tender_leakey
 
 $ docker logs 775a8e192f2b | tail -n 1
-2019-08-21 00:33:00.570707843 +0000 sample.test: {"json":"message"}
+2021-03-16 09:12:15.257351750 +0000 sample.test: {"json":"message"}
 ```
 
 ## Next Steps