HA
ZK NN DN RM NM JN ZKFC
master 1 1 1 1 1
node1 1 1 1 1 1 1 1
node2 1 1 1 1
1.免密鑰
在兩個主節點生成密鑰檔案
ssh-keygen -t rsa
ssh-copy-id ip
master-->master,node1,node2
node1-->master,node1,node2
2.停止HDFS叢集
stop-dfs.sh
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiNx8FesU2cfdGLwczX0xiRGZkRGZ0Xy9GbvNGLwIzXlpXazxCShBXN50WN1A1QiVTQClGVF5UMR9Fd4VGdsATNfd3bkFGazxycykFaKdkYzZUbapXNXlleSdVY2pESa9VZwlHdssmch1mclRXY39CXldWYtlWPzNXZj9mcw1ycz9WL49zZuBnLxUDO3MTYhRTY4UzNiRTYhNmZzQjY3QzY1kDOjVDN5czLc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.png)
3.修改hadoop配置檔案
core-site.xml
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://cluster</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/local/soft/hadoop-2.7.6/tmp</value>
</property>
<property>
<name>fs.trash.interval</name>
<value>1440</value>
</property>
<property>
<name>ha.zookeeper.quorum</name>
<value>master:2181,node1:2181,node2:2181</value>
</property>
</configuration>
hdfs-site.xml
<!-- //以下為HDFS HA的配置// -->
<!-- 指定hdfs的nameservices名稱為mycluster -->
<property>
<name>dfs.nameservices</name>
<value>cluster</value>
</property>
<!-- 指定cluster的兩個namenode的名稱分别為nn1,nn2 -->
<property>
<name>dfs.ha.namenodes.cluster</name>
<value>nn1,nn2</value>
</property>
<!-- 配置nn1,nn2的rpc通信端口 -->
<property>
<name>dfs.namenode.rpc-address.cluster.nn1</name>
<value>master:8020</value>
</property>
<property>
<name>dfs.namenode.rpc-address.cluster.nn2</name>
<value>node1:8020</value>
</property>
<!-- 配置nn1,nn2的http通信端口 -->
<property>
<name>dfs.namenode.http-address.cluster.nn1</name>
<value>master:50070</value>
</property>
<property>
<name>dfs.namenode.http-address.cluster.nn2</name>
<value>node1:50070</value>
</property>
<!-- 指定namenode中繼資料存儲在journalnode中的路徑 -->
<property>
<name>dfs.namenode.shared.edits.dir</name>
<value>qjournal://master:8485;node1:8485;node2:8485/cluster</value>
</property>
<!-- 指定journalnode日志檔案存儲的路徑 -->
<property>
<name>dfs.journalnode.edits.dir</name>
<value>/usr/local/soft/hadoop-2.7.6/data/journal</value>
</property>
<!-- 指定HDFS用戶端連接配接active namenode的java類 -->
<property>
<name>dfs.client.failover.proxy.provider.cluster</name>
<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
</property>
<!-- 配置隔離機制為ssh -->
<property>
<name>dfs.ha.fencing.methods</name>
<value>
sshfence
shell(/bin/true)
</value>
</property>
<!-- 指定秘鑰的位置 -->
<property>
<name>dfs.ha.fencing.ssh.private-key-files</name>
<value>/root/.ssh/id_rsa</value>
</property>
<!-- 開啟自動故障轉移 -->
<property>
<name>dfs.ha.automatic-failover.enabled</name>
<value>true</value>
</property>
4.删除hadoop資料存儲目錄下的檔案 每個節點都需要删除
rm -rf /usr/local/soft/hadoop-2.7.6/tmp
5.将hadoop目錄下的所有配置檔案同步到其它節點
cd /usr/local/soft/hadoop-2.7.6/etc/hadoop
scp ./* node1:`pwd`
scp ./* node2:`pwd`
6.啟動zookeeper,三台都需要啟動(若已啟動則檢視狀态)
#啟動zookeeper
zkServer.sh start
#檢視狀态
zkServer.sh status
7.啟動JN(journalnode),三台都需啟動
/usr/local/soft/hadoop-2.7.6/sbin/hadoop-daemon.sh start journalnode
8.格式化,在一台NN上執行(這裡選擇master)
#格式化
hdfs namenode -format
#啟動目前NN
hadoop-daemon.sh start namenode
9.執行同步,沒有格式化的NN上執行,在另外一台namenode上面執行(這裡選擇node1)
/usr/local/soft/hadoop-2.7.6/bin/hdfs namenode -bootstrapStandby
10.格式化ZK(這裡再master上執行)
注意!一定要先把zk叢集正常啟動起來
/usr/local/soft/hadoop-2.7.6/bin/hdfs zkfc -formatZK
11.啟動hdfs叢集(在master上執行)
start-dfs.sh