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高可用配置

# Flume 高可用配置

## 角色分配

Flume 的 Agent 和 Collector 分布如下表所示：

名称 | HOST | 角色
--- | --- | ---
Agent1 | node01 | Web Server
Collector1 | node02 | AgentMstr1
Collector2 | node03 | AgentMstr2

图中所示，Agent1 数据分别流入到 Collector1 和 Collector2，Flume NG 本身提供了 Failover 机制，可以自动切换和恢复。在上图中，有 3 个产生日志服务器分布在不同的机房，要把所有的日志都收集到一个集群中存储。下 我们开发配置 Flume NG 集群

## node01 安装配置 flume 与拷贝文件脚本

将 node03 机器上面的 flume 安装包拷贝到 node01 机器上面去

node03 机器执行以下命令

    cd /export/servers
    scp -r apache-flume-1.6.0-cdh5.14.0-bin/ node01:$PWD

node01 机器配置 agent 的配置文件

    cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin/conf
    vim agent.conf

agent.conf

    #agent1 name
    agent1.channels = c1
    agent1.sources = r1
    agent1.sinks = k1 k2
    #
    ##set gruop
    agent1.sinkgroups = g1
    #
    ##set channel
    agent1.channels.c1.type = memory
    agent1.channels.c1.capacity = 1000
    agent1.channels.c1.transactionCapacity = 100
    #
    agent1.sources.r1.channels = c1
    agent1.sources.r1.type = exec
    agent1.sources.r1.command = tail -F
    /export/servers/taillogs/access_log
    #
    agent1.sources.r1.interceptors = i1 i2
    agent1.sources.r1.interceptors.i1.type = static
    agent1.sources.r1.interceptors.i1.key = Type
    agent1.sources.r1.interceptors.i1.value = LOGIN
    agent1.sources.r1.interceptors.i2.type = timestamp
    #
    ## set sink1
    agent1.sinks.k1.channel = c1
    agent1.sinks.k1.type = avro
    agent1.sinks.k1.hostname = node02
    agent1.sinks.k1.port = 52020
    #
    ## set sink2
    agent1.sinks.k2.channel = c1
    agent1.sinks.k2.type = avro
    agent1.sinks.k2.hostname = node03
    agent1.sinks.k2.port = 52020
    #
    ##set sink group
    agent1.sinkgroups.g1.sinks = k1 k2
    #
    ##set failover
    agent1.sinkgroups.g1.processor.type = failover
    agent1.sinkgroups.g1.processor.priority.k1 = 10
    agent1.sinkgroups.g1.processor.priority.k2 = 1
    agent1.sinkgroups.g1.processor.maxpenalty = 10000
    #

## node02 与 node03 配置 flumecollection

node02 机器修改配置文件

    cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin/conf
    vim collector.conf

collector.conf

    #set Agent name
    a1.sources = r1
    a1.channels = c1
    a1.sinks = k1
    #
    ##set channel
    a1.channels.c1.type = memory
    a1.channels.c1.capacity = 1000
    a1.channels.c1.transactionCapacity = 100
    #
    ## other node,nna to nns
    a1.sources.r1.type = avro
    a1.sources.r1.bind = node02
    a1.sources.r1.port = 52020
    a1.sources.r1.interceptors = i1
    a1.sources.r1.interceptors.i1.type = static
    a1.sources.r1.interceptors.i1.key = Collector
    a1.sources.r1.interceptors.i1.value = node02
    a1.sources.r1.channels = c1
    #
    ##set sink to hdfs
    a1.sinks.k1.type=hdfs
    a1.sinks.k1.hdfs.path= hdfs://node01:8020/flume01/failover/
    a1.sinks.k1.hdfs.fileType=DataStream
    a1.sinks.k1.hdfs.writeFormat=TEXT
    a1.sinks.k1.hdfs.rollInterval=10
    a1.sinks.k1.channel=c1
    a1.sinks.k1.hdfs.filePrefix=%Y-%m-%d
    #

node03 机器修改配置文件

    cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin/conf
    vim collector.conf

collector.conf

    #set Agent name
    a1.sources = r1
    a1.channels = c1
    a1.sinks = k1
    #
    ##set channel
    a1.channels.c1.type = memory
    a1.channels.c1.capacity = 1000
    a1.channels.c1.transactionCapacity = 100
    #
    ## other node,nna to nns
    a1.sources.r1.type = avro
    a1.sources.r1.bind = node03
    a1.sources.r1.port = 52020
    a1.sources.r1.interceptors = i1
    a1.sources.r1.interceptors.i1.type = static
    a1.sources.r1.interceptors.i1.key = Collector
    a1.sources.r1.interceptors.i1.value = node03
    a1.sources.r1.channels = c1
    #
    ##set sink to hdfs
    a1.sinks.k1.type=hdfs
    a1.sinks.k1.hdfs.path= hdfs://node01:8020/flume01/failover/
    a1.sinks.k1.hdfs.fileType=DataStream
    a1.sinks.k1.hdfs.writeFormat=TEXT
    a1.sinks.k1.hdfs.rollInterval=10
    a1.sinks.k1.channel=c1
    a1.sinks.k1.hdfs.filePrefix=%Y-%m-%d

## 顺序启动命令

node03 机器上面启动 flume

    cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin
    bin/flume-ng agent -n a1 -c conf -f conf/collector.conf -Dflume.root.logger=DEBUG,console

node02 机器上面启动 flume

    cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin
    bin/flume-ng agent -n a1 -c conf -f conf/collector.conf -Dflume.root.logger=DEBUG,console

node01 机器上面启动 flume

    cd /export/servers/apache-flume-1.6.0-cdh5.14.0-bin
    bin/flume-ng agent -n agent1 -c conf -f conf/agent.conf -Dflume.root.logger=DEBUG,console

node01 机器启动文件产生脚本

    mkdir -p /export/servers/shells/
    mkdir -p /export/servers/taillogs
    cd /export/servers/shells/
    vim tail-file.sh

tail-file.sh

    #!/bin/bash
    while true
    do
      date >> /export/servers/taillogs/access_log;
      sleep 0.5;
    done

启动脚本

    sh /export/servers/shells/tail-file.sh

    tail -f access_log

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