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本文介绍如何使用Flume的execsource、memorychannel和avrosink组件，实现实时采集A服务器日志并传输至B服务器的过程。通过配置两个Flume agent，一个负责日志采集，另一个负责接收和输出日志，实现从日志源到目标系统的无缝连接。

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Flume项目实战3

需求：将A服务器上的日志实时采集到B服务器

技术选型： exec source + memory channel +avro sink
Avro source + memory channel + logger sink

exec-memory-avro.conf

Name the components on this agent

exec-memory-avro.sources = exec-source
exec-memory-avro.sinks = avro-sink
exec-memory-avro.channels = memory-channel

Describe/configure the source

exec-memory-avro.sources.exec-source.type = exec
exec-memory-avro.sources.exec-source.command = tail -F /data/data.log
exec-memory-avro.sources.exec-source.shell = /bin/sh -c

Describe the sink

exec-memory-avro.sinks.avro-sink.type = avro
exec-memory-avro.sinks.avro-sink.hostname = localhost
exec-memory-avro.sinks.avro-sink.port = 44444

Use a channel which buffers events in memory

exec-memory-avro.channels.memory-channel.type = memory

Bind the source and sink to the channel

exec-memory-avro.sources.exec-source.channels = memory-channel
exec-memory-avro.sinks.avro-sink.channel = memory-channel

avro-memory-logger.conf

Name the components on this agent

avro-memory-logger.sources = avro-source
avro-memory-logger.sinks = logger-sink
avro-memory-logger.channels = memory-channel

Describe/configure the source

avro-memory-logger.sources.avro-source.type = avro
avro-memory-logger.sources.avro-source.bind = localhost
avro-memory-logger.sources.avro-source.port = 44444

Describe the sink

avro-memory-logger.sinks. logger-sink.type = logger

Use a channel which buffers events in memory

avro-memory-logger.channels. memory-channel.type = memory

Bind the source and sink to the channel

avro-memory-logger.sources.avro-source.channels = memory-channel
avro-memory-logger.sinks.logger-sink.channel = memory-channel

先启动avro-memory-logger：
flume-ng agent
–name avro-memory-logger
–conf $FLUME_HOME/conf
–conf-file $FLUME_HOME/conf/avro-memory-logger.conf
-Dflume.root.logger=INFO,console

再启动exec-memory-avro.conf：
flume-ng agent
–name exec-memory-avro
–conf $FLUME_HOME/conf
–conf-file $FLUME_HOME/conf/exec-memory-avro.conf
-Dflume.root.logger=INFO,console

日志收集过程：
1）机器A上监控一个文件，当我们访问主站时会有用户行为日志记录d奥access.log中
2） Avro sink 把新产生的日志输出到对应的avro source指定的hostname和port上
3）通过avro source对应的agent将我们的日志输出到控制台(kafka)

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