flume日志采集系统

Flume是一个高可用的，高可靠的，分布式的海量日志采集、聚合和传输的系统，Flume支持在日志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。

agent是flume最小的独立运行单元，一个agent就是一个jvm，所有，在安装flume之前必须安装jdk。

一：flume安装：

wget  http://mirrors.cnnic.cn/apache/flume/1.7.0/apache-flume-1.7.0-bin.tar.gz

二：解压：

tar -xvzf apache-flume*.tar.gz

三：修改配置文件：

1：修改conf文件夹下flume-env.sh来指定JAVA_HOME，如果不去指定JAVA_HOME就有可能在启动flume时报错：

exportJAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64

JRE_HOME=$JAVA_HOME/jre

2：在conf文件夹下新建flume.conf:

这是位于日志存放机器上的flume配置，它用来接收其他机器上flume发过来的数据，在channel选择器通过报头的不同键值来区分放在哪个channel里，最后由不同的sink将不同channel里的数据存放到不同的文件里。

a1.sources = r1
a1.sinks = k1 k2
a1.channels = c1 c2

# source配置
a1.sources.r1.type = avro
a1.sources.r1.bind = 192.168.1.80
a1.sources.r1.port = 4444
a1.sources.r1.channels = c1 c2
a1.sources.r1.selector.type=multiplexing
a1.sources.r1.selector.header=sn
a1.sources.r1.selector.mapping.game1=c1
a1.sources.r1.selector.mapping.game2=c2

# channel配置
a1.channels.c1.type = memory
a1.channels.c1.capacity = 10000
a1.channels.c1.transactionCapacity = 10000
a1.channels.c1.byteCapacity = 800000
a1.channels.c1.keep-alive=3
a1.channels.c2.type = memory
a1.channels.c2.capacity = 10000
a1.channels.c2.transactionCapacity = 10000
a1.channels.c2.byteCapacity = 800000
a1.channels.c2.keep-alive=3


#sink配置
a1.sinks.k1.type = com.fyx.flume.FileSink
a1.sinks.k1.file.path = /home/ayue/flume/flume-test/game1/
a1.sinks.k1.channel = c1
a1.sinks.k1.file.filePrefix = log-
a1.sinks.k1.file.txnEventMax = 100
a1.sinks.k1.file.maxOpenFiles = 5

a1.sinks.k2.type = com.fyx.flume.FileSink
a1.sinks.k2.file.path = /home/ayue/flume/flume-test/game2/
a1.sinks.k2.channel = c2
a1.sinks.k2.file.filePrefix = log-
a1.sinks.k2.file.txnEventMax = 100
a1.sinks.k2.file.maxOpenFiles = 5

这是位于日志采集机器上的flume配置，采集数据后通过source拦截器给每个事件添加上报头以及报头上的key和value，方便后面的channel选择器来进行选择。

a2.sources = r2
a2.sinks = k2
a2.channels = c2

# source配置
a2.sources.r2.type = exec
a2.sources.r2.command = tail -F /home/ayue/flume/flume-source/serviceTest.log
a2.sources.r2.channels = c2
a2.sources.r2.interceptors = static
a2.sources.r2.interceptors.static.type=static
a2.sources.r2.interceptors.static.key=sn
a2.sources.r2.interceptors.static.value =game1
a2.sources.r2.interceptors.static.preserveExisting=false

# channel配置
a2.channels.c2.type = memory
a2.channels.c2.capacity = 10000
a2.channels.c2.transactionCapacity = 10000
a2.channels.c2.byteCapacity = 800000
a2.channels.c2.keep-alive=3

#sink配置
a2.sinks.k2.type = avro
a2.sinks.k2.hostname = 192.168.1.80
a2.sinks.k2.port = 4444
a2.sinks.k2.channel = c2
a2.sinks.k2.connect-timeout=20000
a2.sinks.k2.batch-size = 100

在a1的sink配置type是com.fyx.flume.FileSink，这是我自己开发的sink插件，因为flume文件存储不支持log-2018-04-18-21这种格式的目录输出，所有就自己开发了这个插件。

插件地址

https://download.csdn.net/download/newayue/10360684

或：https://github.com/ayue123/flume

3：插件导入：

直接在flume下创建plugins.d目录，目录结构为：

plugins.d/

plugins.d/FileSink/

plugins.d/FileSink/lib/flume-file-sink.jar

plugins.d/FileSink/libext/

plugins.d/FileSink/native/

lib是放插件JAR的目录，libext是放插件的依赖JAR的目录，native放使用到的原生库

重新启动flumeagent,flume就会自动装载我们的插件，这样在flume.conf中就可以使用全路径类名配置type属性了.

四：启动：

先将a1启动：

bin/flume-ngagent--confconf--conf-file./conf/flume.conf--name a1-Dflume.root.logger=INFO,console

之后启动a2

bin/flume-ngagent--confconf--conf-file./conf/flume.conf--name a2-Dflume.root.logger=INFO,console

我们可以写一个死循环来模拟日志的写入:

while true

>do

> date >>serviceTest.log

> sleep2

> done 

五：一些需要注意的坑：

1：a1.sources.r1.channels = c1其中channels不能写为channel，如果写错就会报下面的错：

2018-04-19 01:37:45,867 (conf-file-poller-0) [WARN - org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.validateSources(FlumeConfiguration.java:589)] Could not configure source  r1 due to: Failed to configure component!
org.apache.flume.conf.ConfigurationException: Failed to configure component!
        at org.apache.flume.conf.source.SourceConfiguration.configure(SourceConfiguration.java:111)
        at org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.validateSources(FlumeConfiguration.java:566)
        at org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.isValid(FlumeConfiguration.java:346)
        at org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.access$000(FlumeConfiguration.java:212)
        at org.apache.flume.conf.FlumeConfiguration.validateConfiguration(FlumeConfiguration.java:126)
        at org.apache.flume.conf.FlumeConfiguration.(FlumeConfiguration.java:108)
        at org.apache.flume.node.PropertiesFileConfigurationProvider.getFlumeConfiguration(PropertiesFileConfigurationProvider.java:189)
        at org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(AbstractConfigurationProvider.java:93)
        at org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:141)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.flume.conf.ConfigurationException: No channels set for r1
        at org.apache.flume.conf.source.SourceConfiguration.configure(SourceConfiguration.java:69)
        ... 15 more

2：a1.sinks.k1.sink.directory= /var/log/flume，其中红色的sink不能省略，省略就会报下面的错：

java.lang.IllegalArgumentException: Directory may not be null
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
        at org.apache.flume.sink.RollingFileSink.configure(RollingFileSink.java:90)
        at org.apache.flume.conf.Configurables.configure(Configurables.java:41)
        at org.apache.flume.node.AbstractConfigurationProvider.loadSinks(AbstractConfigurationProvider.java:411)
        at org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(AbstractConfigurationProvider.java:102)
        at org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:141)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)