Flume-ng配置

1）简介

Flume是一个分布式、可靠、和高可用的海量日志聚合的系统，支持在系统中定制各类数据发送方，用于收集数据；同时，Flume提供对数据进行简单处理，并写到各种数据接受方（可定制）的能力。

设计目标： (1) 可靠性 当节点出现故障时，日志能够被传送到其他节点上而不会丢失。Flume提供了三种级别的可靠性保障，从强到弱依次分别为：end-to-end（收到数据agent首先将event写到磁盘上，当数据传送成功后，再删除；如果数据发送失败，可以重新发送。），Store on failure（当数据接收方crash时，将数据写到本地，待恢复后，继续发送），Best effort（数据发送到接收方后，不会进行确认）。 (2) 可扩展性 Flume采用了三层架构，分别为agent，collector和storage，每一层均可以水平扩展。其中，所有agent和collector由master统一管理，这使得系统容易监控和维护，且master允许有多个（使用ZooKeeper进行管理和负载均衡），这就避免了单点故障问题。 (3) 可管理性 所有agent和colletor由master统一管理，这使得系统便于维护。多master情况，Flume利用ZooKeeper和gossip，保证动态配置数据的一致性。用户可以在master上查看各个数据源或者数据流执行情况，且可以对各个数据源配置和动态加载。Flume提供了web 和shell script command两种形式对数据流进行管理。 (4) 功能可扩展性 用户可以根据需要添加自己的agent，collector或者storage。此外，Flume自带了很多组件，包括各种agent（file， syslog等），collector和storage（File，HDFS，HBase等）。

2）配置

之前配置过Hadoop和hbase，所以需要先将hadoop和hbase启动，才能将文件写入hdfs和hbase。hadoop-2.2.0和hbase-0.96.0的配置分别参考《Ubuntu和CentOS中分布式配置Hadoop-2.2.0》 http://www.linuxidc.com/Linux/2014-01/95799.htm 和《CentOS分布式环境安装HBase-0.96.0》 http://www.linuxidc.com/Linux/2014-01/95801.htm 。

本次配置环境为两台装有centos 的测试集群。主机名为master的机器负责收集日志，主机名为node的机器负责日志的写入，本次配置的写入方式有三种：写入普通目录，写入hdfs。

首先下载flume-ng的二进制压缩文件。地址：http://flume.apache.org/download.html。下载好后，解压文件。首先编辑/etc/profile文件，在其中添加如下几行：

1. export FLUME_HOME=/home/aaron/apache-flume-1.4.0-bin
2. export FLUME_CONF_DIR=$FLUME_HOME/conf
3. export PATH=$PATH:$FLUME_HOME/bin

export FLUME_HOME=/home/aaron/apache-flume-1.4.0-bin
export FLUME_CONF_DIR=$FLUME_HOME/conf
export PATH=$PATH:$FLUME_HOME/bin

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添加好之后记得运行$ souce /etc/profile命令使修改生效。

在master的flume文件夹的conf目录中，新建一个flume-master.conf文件，内容如下：

1. agent.sources = seqGenSrc
2. agent.channels = memoryChannel
3. agent.sinks = remoteSink
5. # For each one of the sources, the type is defined
6. agent.sources.seqGenSrc.type = exec
7. agent.sources.seqGenSrc.command = tail -F /home/aaron/test
9. # The channel can be defined as follows.
10. agent.sources.seqGenSrc.channels = memoryChannel
12. # Each sink's type must be defined
13. agent.sinks.loggerSink.type = logger
15. #Specify the channel the sink should use
16. agent.sinks.loggerSink.channel = memoryChannel
18. # Each channel's type is defined.
19. agent.channels.memoryChannel.type = memory
21. # Other config values specific to each type of channel(sink or source)
22. # can be defined as well
23. # In this case, it specifies the capacity of the memory channel
24. agent.channels.memoryChannel.capacity = 100
25. agent.channels.memoryChannel.keep-alive = 100
27. agent.sinks.remoteSink.type = avro
28. agent.sinks.remoteSink.hostname = node
29. agent.sinks.remoteSink.port = 23004
30. agent.sinks.remoteSink.channel = memoryChannel

agent.sources = seqGenSrc
agent.channels = memoryChannel
agent.sinks = remoteSink

# For each one of the sources, the type is defined
agent.sources.seqGenSrc.type = exec
agent.sources.seqGenSrc.command = tail -F /home/aaron/test

# The channel can be defined as follows.
agent.sources.seqGenSrc.channels = memoryChannel

# Each sink's type must be defined
agent.sinks.loggerSink.type = logger

#Specify the channel the sink should use
agent.sinks.loggerSink.channel = memoryChannel

# Each channel's type is defined.
agent.channels.memoryChannel.type = memory

# Other config values specific to each type of channel(sink or source)
# can be defined as well
# In this case, it specifies the capacity of the memory channel
agent.channels.memoryChannel.capacity = 100
agent.channels.memoryChannel.keep-alive = 100

agent.sinks.remoteSink.type = avro
agent.sinks.remoteSink.hostname = node
agent.sinks.remoteSink.port = 23004
agent.sinks.remoteSink.channel = memoryChannel

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在node机器上也将/etc/profile文件添加上面的配置。然后，在conf中新建一个flume-node.conf文件，修改如下：

1. agent.sources = seqGenSrc1
2. agent.channels = memoryChannel
3. #agent.sinks = fileSink
4. agent.sinks = <SPANstyle="FONT-FAMILY: Arial, Helvetica, sans-serif">fileSink</SPAN>
6. # For each one of the sources, the type is defined
7. agent.sources.seqGenSrc1.type = avro
8. agent.sources.seqGenSrc1.bind = node
9. agent.sources.seqGenSrc1.port = 23004
11. # The channel can be defined as follows.
12. agent.sources.seqGenSrc1.channels = memoryChannel
14. # Each sink's type must be defined
15. agent.sinks.loggerSink.type = logger
17. #Specify the channel the sink should use
18. agent.sinks.loggerSink.channel = memoryChannel
20. # Each channel's type is defined.
21. agent.channels.memoryChannel.type = memory
23. # Other config values specific to each type of channel(sink or source)
24. # can be defined as well
25. # In this case, it specifies the capacity of the memory channel
26. agent.channels.memoryChannel.capacity = 100
27. agent.channels.memoryChannel.keep-alive = 100
29. agent.sources.flieSink.type = avro
30. agent.sources.fileSink.channel = memoryChannel
31. agent.sources.fileSink.sink.directory = /home/aaron/
32. agent.sources.fileSink.serializer.appendNewline = true

agent.sources = seqGenSrc1
agent.channels = memoryChannel
#agent.sinks = fileSink
agent.sinks = fileSink

# For each one of the sources, the type is defined
agent.sources.seqGenSrc1.type = avro 
agent.sources.seqGenSrc1.bind = node
agent.sources.seqGenSrc1.port = 23004 

# The channel can be defined as follows.
agent.sources.seqGenSrc1.channels = memoryChannel

# Each sink's type must be defined
agent.sinks.loggerSink.type = logger

#Specify the channel the sink should use
agent.sinks.loggerSink.channel = memoryChannel

# Each channel's type is defined.
agent.channels.memoryChannel.type = memory

# Other config values specific to each type of channel(sink or source)
# can be defined as well
# In this case, it specifies the capacity of the memory channel
agent.channels.memoryChannel.capacity = 100
agent.channels.memoryChannel.keep-alive = 100

agent.sources.flieSink.type = avro
agent.sources.fileSink.channel = memoryChannel
agent.sources.fileSink.sink.directory = /home/aaron/
agent.sources.fileSink.serializer.appendNewline = true

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在master上面运行命令：

1. $ bin/flume-ng agent --conf ./conf/ -f conf/flume-maste.conf -Dflume.root.logger=DEBUG,console -n agent

$ bin/flume-ng agent --conf ./conf/ -f conf/flume-maste.conf -Dflume.root.logger=DEBUG,console -n agent

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在node上运行命令：

1. $ bin/flume-ng agent --conf ./conf/ -f conf/flume-node.conf -Dflume.root.logger=DEBUG,console -n agent

$ bin/flume-ng agent --conf ./conf/ -f conf/flume-node.conf -Dflume.root.logger=DEBUG,console -n agent

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启动之后，就可以发现两者之间可以相互通信，master上面的文件就能发送到node上，修改master上的test文件，在后面追加内容时，node也可以接收到。

如果想要将内容写入hadoop，可以将node中的flume-node.conf文件做如下修改：

1. agent.sinks = k2
3. agent.sinks.k2.type = hdfs
4. agent.sinks.k2.channel = memoryChannel
5. agent.sinks.k2.hdfs.path = hdfs://master:8089/hbase
6. agent.sinks.k2.hdfs.fileType = DataStream
7. agent.sinks.k2.hdfs.writeFormat = Text

agent.sinks = k2

agent.sinks.k2.type = hdfs
agent.sinks.k2.channel = memoryChannel
agent.sinks.k2.hdfs.path = hdfs://master:8089/hbase
agent.sinks.k2.hdfs.fileType = DataStream
agent.sinks.k2.hdfs.writeFormat = Text

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其中，hdfs://master:8089/hbase为hadoop的hdfs文件路径。