查看默认驱动 docker info --format '{{.LoggingDriver}}'

		
[root@testing ~]# docker info --format '{{.LoggingDriver}}'
json-file	
		
		

查看容器日志配置

		
[root@testing ~]# docker inspect -f '{{.HostConfig.LogConfig.Type}}' api
fluentd
		
		

在 Docker 中安装 Fluentd

准备 test.conf 文件

		
 <source>
   @type forward
 </source>

 <match **>
   @type stdout
 </match>
		
		

启动 fluentd 接收日志

		
 $ docker run -it -p 24224:24224 -v /path/to/conf/test.conf:/fluentd/etc/test.conf -e FLUENTD_CONF=test.conf fluent/fluentd:latest		
		
		

运行你的程序

		
$ docker run --log-driver=fluentd your/application		
		
		

如果是远程主机使用 fluentd-address 参数

		
docker run --log-driver=fluentd --log-opt fluentd-address=fluentdhost:24224
docker run --log-driver=fluentd --log-opt fluentd-address=tcp://fluentdhost:24224
docker run --log-driver=fluentd --log-opt fluentd-address=unix:///path/to/fluentd.sock		
		
		

以 Nginx 为例：

		
$ docker run -d \
--log-driver=fluentd \
--log-opt fluentd-address=10.10.0.1:24224 \
--log-opt tag="docker.{{.Name}}" \
nginx		
		
		

fluentd.conf

		
<source>
  @type forward
</source>

<match **>
  @type file
  path               /var/log/fluentd/${tag}
  append             true
  <format>
    @type            single_value
    message_key      log
  </format>
  <buffer tag,time>
    @type             file
    timekey           1d
    timekey_wait      10m
    flush_mode        interval
    flush_interval    30s
  </buffer>
</match>		
		
		

		
version: '3.9'
services:		
  fluentd:
    image: fluent/fluentd:latest
    container_name: fluentd
    hostname: fluentd.netkiller.cn
    restart: always
    volumes:
      - /opt/netkiller.cn/ops.netkiller.cn/fluentd/conf:/fluentd/etc
      - /var/log/fluentd:/var/log/fluentd
    ports:
      - "24224:24224"
      - "24224:24224/udp"
    environment:
      FLUENTD_CONF: fluentd.conf

  api:
    image: openjdk:8
    container_name: api
    restart: always
    hostname: api.netkiller.cn
    extra_hosts:
      - www.netkiller.cn:139.186.170.130
    environment:
      TZ: Asia/Shanghai
      JAVA_OPTS: -Xms1024m -Xmx4096m -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=512m
    ports:
      - 8088:8080
    volumes:
      - /opt/netkiller.cn/api.netkiller.cn:/app
      - /opt/netkiller.cn/api.netkiller.cn/logs:/app/logs
    working_dir: /app
    #links:
    #  - fluentd
    logging:
      driver: fluentd
      options:
        fluentd-address: 192.168.30.10:24224
        tag: httpd.access
    entrypoint: java -jar /app/api.netkiller.cn.jar
    command:
      --spring.profiles.active=test
      --server.port=8080		
		
		

		
# ls -l /var/log/nginx/
total 0
lrwxrwxrwx    1 root     root            11 Jan 31  2022 access.log -> /dev/stdout
lrwxrwxrwx    1 root     root            11 Jan 31  2022 error.log -> /dev/stderr