角色
Source 数据来源 (exec, kafka, http…)
Channel 数据通道 (memory,file,jdbc)
Sink 数据目的地 （kafka,hdfs,es…）
Agent 代理，负责从source中采集数据，发送给collector
Collector 收集者，收集agent发来的数据上传到outer storage，可以设置load balance,fail over
Outer storage 外部存储，接收collector上传的数据
安装配置
下载tar包
解压即安装
测试
修改配置文件，监听44444端口
# example.conf: A single-node Flume configuration
# Name the components on this agent
a1.sources = r1
a1.sinks = k1
a1.channels = c1
# Describe/configure the source
a1.sources.r1.type = netcat
a1.sources.r1.bind = localhost
a1.sources.r1.port = 44444
# Describe the sink
a1.sinks.k1.type = logger
# Use a channel which buffers events in memory
a1.channels.c1.type = memory
a1.channels.c1.capacity = 1000
a1.channels.c1.transactionCapacity = 100
# Bind the source and sink to the channel
a1.sources.r1.channels = c1
a1.sinks.k1.channel = c1
启动
通过telnet测试
telnet 127.0.0.1 44444
窗口中输入字符并回车
flume日志中会输出内容
Note:可使用cat, tail -200等从头或者指定位置开始采集日志