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
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:
- export FLUME_HOME=/home/aaron/apache-flume-1.4.0-bin
- export FLUME_CONF_DIR=$FLUME_HOME/conf
- export PATH=$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
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:
- 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
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
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:
- agent.sources = seqGenSrc1
- agent.channels = memoryChannel
- #agent.sinks = fileSink
- agent.sinks = <SPANstyle="FONT-FAMILY: Arial, Helvetica, sans-serif">fileSink</SPAN>
- # 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
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
在master上面运行命令:
- $ 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
在node上运行命令:
- $ 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
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:
- 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
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
其中,hdfs://master:8089/hbase为hadoop的hdfs文件路径。