Centos7 安装Hadoop3.x 完全分布式部署

向右看齐 2022-05-31 04:28 310阅读 0赞

*  1. 最小化安装CentOS 7 系统
    
     *  1.1 安装net-tools启用 ifconfig
     *  1.2 更新系统
     *  1.3 配置系统IP为固定IP
        
         *  1.3.1 查看网卡(文件 ifcfg-enp\* 为网卡文件)
         *  1.3.2 配置网卡(virtualBox 分配 host-only网卡，并使用固定IP)
         *  1.3.3 重启网卡
         *  1.3.4 修改主机名称（可以在安装时候指定）
     *  1.4 配置Host，可以使用名称直接访问
     *  1.5 配置免密码登录，生成各种密码文件
 *  2. 安装JDK
    
     *  2.1 下载JDK 下载
     *  2.2 将下载的JDK放到 opt目录下解压
     *  2.2 将JDK添加到环境变量中
     *  2.3 验证JDK是否安装成功
 *  3. 安装Hadoop
    
     *  3.1 下载Hadoop，下载地址
     *  3.2 将下载的Hadoop放入/opt目录
     *  3.3 安装Zookeeper
        
         *  3.3.1 下载Zookeeper 下载地址
         *  3.3.2 拷贝zookeeper到需要的机器上
         *  3.3.3 解压zookeeper
         *  3.3.4 创建连接文件
         *  3.3.5 配置环境变量
         *  3.3.6 配置zookeeper集群，修改配置文件
         *  3.3.7 将配置文件复制到其他节点
         *  3.3.8 创建节点ID，在配置的 dataDir 路径中添加myid文件
         *  3.3.9 启动 zookeeper(已经添加到环境变量了)
         *  3.3.10 检验是否启动成功
         *  3.3.11 (可选) zookeeper Centos7 配置开机自启动
     *  3.4 修改Hadoop配置(完全分布式)
        
         *  3.4.1 配置Hadoop 环境变量
         *  3.4.2 HADOOP 节点分布如下：
         *  3.4.3 修改Hadoop环境配置文件 hadoop-env.sh
         *  3.4.4 参考 官方文档 配置高可用HDFS
     *  3.5 启动HDFS
        
         *  3.5.1 先启动zookeeper
         *  3.5.2 在其中一个namenode上格式化zookeeper
         *  3.5.3 启动journalnode,需要启动所有节点的journalnode
         *  3.5.4 格式化namenode
         *  3.5.5 启动namenode,以便同步其他namenode
         *  3.5.6 其他namenode同步
         *  3.5.7 配置datanode
         *  3.5.7 启动hdfs
 *  4. Hadoop 配置日志聚合和jobhistoryserver
    
     *  4.1 yarn-site.xml 配置resourcemanager web监听
     *  4.2 mapred-site.xml配置jobhistoryserver
     *  4.3 yarn-site.xml配置日志聚合
     *  错误处理
        
         *  1. zkfc 格式化错误
         *  2. 格式化namenode 报错，一直在尝试连接
         *  3. hdfs 启动报错
         *  4. yarn 启用报错
         *  5. NodeManager 启动报错
         *  6. NodeManager启动之后又结束
         *  7. hdfs 安全模式开(safe mode is on)

# 1. 最小化安装CentOS 7 系统 #

## 1.1 安装net-tools启用 ifconfig ##

yum install net-tools vim

## 1.2 更新系统 ##

yum update

## 1.3 配置系统IP为固定IP ##

### 1.3.1 查看网卡(文件 ifcfg-enp\* 为网卡文件) ###

ls /etc/sysconfig/network-scripts/

### 1.3.2 配置网卡(virtualBox 分配 host-only网卡，并使用固定IP) ###

vi /etc/sysconfig/network-scripts/ifcfg-enp*
    # 启用host-only网卡
    cd /etc/sysconfig/network-scripts/
    cp ifcfg-enp0s3  ifcfg-enp0s8

修改网卡为静态IP  
1. 修改BOOTPROTO为static  
2. 修改NAME为enp0s8  
3. 修改UUID（可以随意改动一个值，只要不和原先的一样）  
4. 添加IPADDR，可以自己制定，用于主机连接虚拟机使用。  
5. 添加NETMASK=255.255.255.0 (网管 也可以和网段一样 x.x.x.255)  
![image][]

### 1.3.3 重启网卡 ###

service network restart

### 1.3.4 修改主机名称（可以在安装时候指定） ###

vim /etc/hostname

## 1.4 配置Host，可以使用名称直接访问 ##

vim /etc/hosts
    # 复制到其他机器
    scp /etc/hosts  root@192.168.56.12:/etc/hosts

增加内容  
![image][image 1]

## 1.5 配置免密码登录，生成各种密码文件 ##

ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
        cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
        chmod 0600 ~/.ssh/authorized_keys
        # 拷贝公钥到远程服务器
        cat ~/.ssh/id_rsa.pub | ssh root@192.168.56.101  "cat - >> ~/.ssh/authorized_keys"
    
        # 如果需要互相免密码登录，则执行下面命令
        scp .ssh/authorized_keys  root@192.168.56.14:~/.ssh/authorized_keys

# 2. 安装JDK #

## 2.1 下载JDK [下载][Link 1] ##

## 2.2 将下载的JDK放到 opt目录下解压 ##

cd /opt/
        tar -xzvf server-jre-8u161-linux-x64.tar.gz
        # 创建快捷方式
        ln -sf jdk1.8.0_161/ jdk

## 2.2 将JDK添加到环境变量中 ##

vim /etc/profile
        # 添加如下内容
        export JAVA_HOME=/opt/jdk
        export PATH=.:$PATH:$JAVA_HOME/bin
        # 使修改生效
        source /etc/profile

## 2.3 验证JDK是否安装成功 ##

java -version

![image][image 2]

# 3. 安装Hadoop #

## 3.1 下载Hadoop，[下载地址][Link 2] ##

## 3.2 将下载的Hadoop放入/opt目录 ##

# 1. 解压Hadoop
        tar -xzvf hadoop-3.0.0.tar.gz 
        # 2. 创建超连接
        ln -sf hadoop-3.0.0 hadoop

## 3.3 安装Zookeeper ##

### 3.3.1 下载Zookeeper [下载地址][Link 3] ###

### 3.3.2 拷贝zookeeper到需要的机器上 ###

scp /opt/zookeeper-3.4.11.tar.gz node2:/opt/

### 3.3.3 解压zookeeper ###

tar -xzvf zookeeper-3.4.11.tar.gz

### 3.3.4 创建连接文件 ###

ln -sf zookeeper-3.4.11 zookeeper

### 3.3.5 配置环境变量 ###

vim /etc/profilve
            # 添加如下内容
            export ZOOKEEPER_HOME = /opt/zookeeper
            export PATH = $PATH:$ZOOKEEPER_HOME/bin

### 3.3.6 配置zookeeper集群，修改配置文件 ###

cp /opt/zookeeper/conf/zoo_sample.cfg /opt/zookeeper/conf/zoo.cfg
            # 5.1 在zoo.cfg 文件末尾追加（zoo1 为 服务器名称）
            # 具体配置见：http://zookeeper.apache.org/doc/r3.4.11/zookeeperStarted.html#sc_RunningReplicatedZooKeeper
            tickTime=2000
            dataDir=/opt/data/zookeeper # 数据存放路径
            clientPort=2181
            initLimit=5
            syncLimit=2
            server.1=node2:2888:3888
            server.2=node3:2888:3888
            server.3=node4:2888:3888

### 3.3.7 将配置文件复制到其他节点 ###

scp /opt/zookeeper/conf/zoo.cfg node2:/opt/zookeeper/conf/

### 3.3.8 创建节点ID，在配置的 dataDir 路径中添加myid文件 ###

echo "1" > myid

### 3.3.9 启动 zookeeper(已经添加到环境变量了) ###

zkServer.sh start

### 3.3.10 检验是否启动成功 ###

jps

如果看到 如下图进程，表示启动成功

![image][image 3]

### 3.3.11 (可选) zookeeper Centos7 配置开机自启动 ###

1.  在/etc/systemd/system/文件夹下创建一个启动脚本zookeeper.service  
    内容如下：

[Unit]
    Description=zookeeper
    After=syslog.target network.target
    
    [Service]
    Type=forking
    # 指定zookeeper 日志文件路径，也可以在zkServer.sh 中定义
    Environment=ZOO_LOG_DIR=/opt/data/zookeeper/logs
    # 指定JDK路径，也可以在zkServer.sh 中定义
    Environment=JAVA_HOME=/opt/jdk
    ExecStart=/opt/zookeeper/bin/zkServer.sh start
    ExecStop=/opt/zookeeper/bin/zkServer.sh stop
    Restart=always
    User=root
    Group=root
    
    [Install]
    WantedBy=multi-user.target

1.  重新加载服务

systemctl daemon-reload

1.  启动zookeeper

systemctl start zookeeper

1.  开机自启动

systemctl enable zookeeper

1.  查看zookeeper状态

systemctl status zookeeper

问题：

nohup: 无法运行命令”java”: 没有那个文件或目录 \\  
nohup: failed to run command \`java’: No such file or directory

解决方法： \\  
主要是找不到Java造成的，配置下环境变量即可，可以在zkServer.sh 中添加如下：

JAVA_HOME=/opt/jdk

或者在zookeeper.service中指定：

Environment=JAVA_HOME=/opt/jdk

## 3.4 修改Hadoop配置(完全分布式) ##

> 参考文档：  
> 1. (Hadoop HDFS分布式配置)[http://hadoop.apache.org/docs/r3.0.0/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html][http_hadoop.apache.org_docs_r3.0.0_hadoop-project-dist_hadoop-hdfs_HDFSHighAvailabilityWithQJM.html]  
> 2. (Hadoop Yarn 分布式配置) [http://hadoop.apache.org/docs/r3.0.0/hadoop-yarn/hadoop-yarn-site/ResourceManagerHA.html][http_hadoop.apache.org_docs_r3.0.0_hadoop-yarn_hadoop-yarn-site_ResourceManagerHA.html]

### 3.4.1 配置Hadoop 环境变量 ###

# 添加hadoop环境变量
        export HADOOP_HOME = /opt/hadoop
        export PATH = $PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin:
        # 启用环境变量
        source /etc/profile

### 3.4.2 HADOOP 节点分布如下： ###

> 上面已经配置好了zookeeper，这里就不需要在配置了

### 3.4.3 修改Hadoop环境配置文件 hadoop-env.sh ###

# 设置Java环境变量
        exprot JAVA_HOME = /opt/jdk
        export HADOOP_HOME = /opt/hadoop

### 3.4.4 参考 [官方文档][http_hadoop.apache.org_docs_r3.0.0_hadoop-project-dist_hadoop-hdfs_HDFSHighAvailabilityWithQJM.html] 配置高可用HDFS ###

1.  配置 hdfs-site.xml 文件如下：

<configuration>
        <property>
            
            <name>dfs.nameservices</name>
            <value>hbzx</value>
        </property>
        <property>
            
            <name>dfs.permissions.enabled</name>
            <value>false</value>
        </property>
        <property>
            
            <name>dfs.ha.namenodes.hbzx</name>
            <value>nn1,nn2</value>
        </property>
        <property>
            
            <name>dfs.namenode.rpc-address.hbzx.nn1</name>
            <value>node1:9820</value>
        </property>
        <property>
            
            <name>dfs.namenode.rpc-address.hbzx.nn2</name>
            <value>node2:9820</value>
        </property>
        <property>
            
            <name>dfs.namenode.http-address.hbzx.nn1</name>
            <value>node1:9870</value>
        </property>
        <property>
            
            <name>dfs.namenode.http-address.hbzx.nn2</name>
            <value>node2:9870</value>
        </property>
    
        <property>
            
            <name>dfs.namenode.shared.edits.dir</name>
            <value>qjournal://node2:8485;node3:8485;node4:8485/hbzx</value>
        </property>
    
        <property>
            
            <name>dfs.client.failover.proxy.provider.hbzx</name>
            <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
        </property>
    
        <property>
            
            <name>dfs.ha.fencing.methods</name>
            <value>sshfence</value>
        </property>
    
        <property>
            <name>dfs.ha.fencing.ssh.private-key-files</name>
            <value>/root/.ssh/id_rsa</value>
        </property>
    
        <property>
            
            <name>dfs.journalnode.edits.dir</name>
            <value>/opt/data/journal/node/local/data</value>
        </property>
    
        <property>
            
            <name>dfs.ha.automatic-failover.enabled</name>
            <value>true</value>
        </property>
    
    </configuration>

1.  配置 core-site.xml

<configuration>
        <property>
            
            <name>fs.defaultFS</name>
            <value>hdfs://hbzx</value>
        </property>
        <property>
            
            <name>hadoop.tmp.dir</name>
            <value>/opt/data/hadoop/</value>
        </property>
    
        <property>
            
            <name>ha.zookeeper.quorum</name>
            <value>node2:2181,node3:2181,node4:2181</value>
        </property>
    
    </configuration>

1.  配置yarn-site.xml 为单节点默认，多节点参考：[官方文档][http_hadoop.apache.org_docs_r3.0.0_hadoop-yarn_hadoop-yarn-site_ResourceManagerHA.html]

<configuration>
        <property>
            <name>yarn.nodemanager.aux-services</name>
            <value>mapreduce_shuffle</value>
        </property>
        <property>
            <name>yarn.nodemanager.env-whitelist</name>
            <value>JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,CLASSPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAPRED_HOME</value>
        </property>
    
        <property>
            
            <name>yarn.resourcemanager.ha.enabled</name>
            <value>true</value>
        </property>
        <property>
            
            <name>yarn.resourcemanager.cluster-id</name>
            <value>hbzx</value>
        </property>
        <property>
            
            <name>yarn.resourcemanager.ha.rm-ids</name>
            <value>rm1,rm2</value>
        </property>
        <property>
            
            <name>yarn.resourcemanager.hostname.rm1</name>
            <value>node1</value>
        </property>
        <property>
            
            <name>yarn.resourcemanager.hostname.rm2</name>
            <value>node2</value>
        </property>
        <property>
            
            <name>yarn.resourcemanager.webapp.address.rm1</name>
            <value>node1:8088</value>
        </property>
        <property>
            
            <name>yarn.resourcemanager.webapp.address.rm2</name>
            <value>node2:8088</value>
        </property>
        <property>
            
            <name>yarn.resourcemanager.zk-address</name>
            <value>node2:2181,node3:2181,node4:2181</value>
        </property>
    
        <property>
            
            <name>yarn.nodemanager.resource.detect-hardware-capabilities</name>
            <value>true</value>
        </property>
    </configuration>

1.  配置mapred-site.xml

<configuration>
        <property>
            <name>mapreduce.framework.name</name>
            <value>yarn</value>
        </property>
    </configuration>

1.  将配置文件复制到其他机器

scp ./* node4:/opt/hadoop/etc/hadoop/

## 3.5 启动HDFS ##

### 3.5.1 先启动zookeeper ###

zkServer.sh start

### 3.5.2 在其中一个namenode上格式化zookeeper ###

hdfs zkfc -formatZK

如下图表示格式化成功  
![image][image 4]

### 3.5.3 启动journalnode,需要启动所有节点的journalnode ###

hdfs --daemon start journalnode

> 使用JPS命令查看journalnode是否启动成功，成功之后能看到JournalNode如下图：  
> ![image][image 5]

### 3.5.4 格式化namenode ###

hdfs namenode -format 
    # 如果有多个namenode名称，可以使用 hdfs namenode -format xxx 指定

> 如果没有Error日志输出表示格式化成功

### 3.5.5 启动namenode,以便同步其他namenode ###

hdfs --daemon start namenode

> 启动之后使用jps命令查询是否启动成功  
> ![image][image 6]

### 3.5.6 其他namenode同步 ###

1.  如果是使用高可用方式配置的namenode，使用下面命令同步(需要同步的namenode执行).

hdfs namenode -bootstrapStandby

![image][image 7]  
2. 如果不是使用高可用方式配置的namenode，使用下面命令同步：

hdfs namenode -initializeSharedEdits

### 3.5.7 配置datanode ###

> 修改workers 文件,添加datanode节点

node2
    node3
    node4

### 3.5.7 启动hdfs ###

start-dfs.sh

> jps 查看结果：  
> ![image][image 8]  
> ![image][image 9]  
> ![image][image 10]  
> ![image][image 11]
> 
> 通过浏览器访问hdfs  
> [http://192.168.56.11:9870][http_192.168.56.11_9870]  
> ![image][image 12]  
> ![image][image 13]

# 4. Hadoop 配置日志聚合和jobhistoryserver #

## 4.1 yarn-site.xml 配置resourcemanager web监听 ##

<property>
             <name>yarn.resourcemanager.webapp.address</name>
             <value>rmhost:8088</value>
     </property>

## 4.2 mapred-site.xml配置jobhistoryserver ##

<property>
        <name>mapreduce.jobhistory.address</name>
        <value>rmhost:10020</value>
    </property>
    <property>
        <name>mapreduce.jobhistory.webapp.address</name>
        <value>rmhost:19888</value>
    </property>
    <property>
        <name>mapreduce.jobhistory.intermediate-done-dir</name>
        <value>/mr-history/tmp</value>
    </property>
    <property>
        <name>mapreduce.jobhistory.done-dir</name>
        <value>/mr-history/done</value>
    </property>

> **注意**：jobhistoryserver需单独启动

mapred --daemon start historyserver

## 4.3 yarn-site.xml配置日志聚合 ##

<property>
        <name>yarn.log-aggregation-enable</name>
        <value>true</value>
    </property>
    
    <property>
        <name>yarn.nodemanager.remote-app-log-dir</name>
        <value>/user/container/logs</value>
    </property>

## 错误处理 ##

### 1. zkfc 格式化错误 ###

![image][image 14]

java.net.NoRouteToHostException: 没有到主机的路由
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361) at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1141) 2018-02-06 11:34:01,218 ERROR ha.ActiveStandbyElector: Connection timed out: couldn't connect to ZooKeeper in 5000 milliseconds 2018-02-06 11:34:01,461 INFO zookeeper.ClientCnxn: Opening socket connection to server node2/192.168.56.12:2181. Will not attempt to authenticate using SASL (unknown error)

解决方法：

> 关闭防火墙，并禁止防火墙启动

systemctl stop firewalld.service #停止firewall
    systemctl disable firewalld.service #禁止firewall开机启动

### 2. 格式化namenode 报错，一直在尝试连接 ###

如图:  
![image][image 15]

2018-02-06 11:43:58,061 INFO ipc.Client: Retrying connect to server: node2/192.168.56.12:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
    2018-02-06 11:43:58,062 INFO ipc.Client: Retrying connect to server: node4/192.168.56.14:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
    2018-02-06 11:43:58,062 INFO ipc.Client: Retrying connect to server: node3/192.168.56.13:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)

解决办法：

> 启用 journalnode,需要分别启动所有节点

hdfs --daemon start journalnode

> 使用JPS命令查看journalnode是否启动成功，成功之后能看到JournalNode如下图：  
> ![image][image 5]

### 3. hdfs 启动报错 ###

![image][image 16]

Starting namenodes on [node1 node2]
    ERROR: Attempting to operate on hdfs namenode as root
    ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.
    Starting datanodes
    ERROR: Attempting to operate on hdfs datanode as root
    ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation.
    Starting journal nodes [node2 node3 node4]
    ERROR: Attempting to operate on hdfs journalnode as root
    ERROR: but there is no HDFS_JOURNALNODE_USER defined. Aborting operation.
    Starting ZK Failover Controllers on NN hosts [node1 node2]
    ERROR: Attempting to operate on hdfs zkfc as root
    ERROR: but there is no HDFS_ZKFC_USER defined. Aborting operation.

> 解决方法：  
> 在start-dfs.sh，stop-dfs.sh 开始位置增加如下配置：

# 注意等号前后不要有空格
    HDFS_NAMENODE_USER=root
    HDFS_DATANODE_USER=root
    HDFS_JOURNALNODE_USER=root
    HDFS_ZKFC_USER=root

### 4. yarn 启用报错 ###

![image][image 17]

Starting resourcemanager
    ERROR: Attempting to operate on yarn resourcemanager as root
    ERROR: but there is no YARN_RESOURCEMANAGER_USER defined. Aborting operation.
    Starting nodemanagers
    ERROR: Attempting to operate on yarn nodemanager as root
    ERROR: but there is no YARN_NODEMANAGER_USER defined. Aborting operation.

> 解决办法：

在start-yarn.sh 文件开始处添加：

# 注意等号前后不要有空格
    YARN_RESOURCEMANAGER_USER=root
    YARN_NODEMANAGER_USER=root

### 5. NodeManager 启动报错 ###

2018-02-06 15:22:36,169 ERROR org.apache.hadoop.yarn.server.nodemanager.NodeManager: Error starting NodeManager
    org.apache.hadoop.yarn.exceptions.YarnRuntimeException: java.net.ConnectException: Your endpoint configuration is wrong; For more details see: http://wiki.apache.org/hadoop/UnsetHostnameOrPort
        at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.serviceStart(NodeStatusUpdaterImpl.java:259)
        at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
        at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:121)
        at org.apache.hadoop.yarn.server.nodemanager.NodeManager.serviceStart(NodeManager.java:451)
        at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
        at org.apache.hadoop.yarn.server.nodemanager.NodeManager.initAndStartNodeManager(NodeManager.java:834)
        at org.apache.hadoop.yarn.server.nodemanager.NodeManager.main(NodeManager.java:894)

> 解决办法：  
> 让 NodeManager自动检测内容和CPU，在yarn-size.xml 添加如下配置：

<property>
            
            <name>yarn.nodemanager.resource.detect-hardware-capabilities</name>
            <value>true</value>
        </property>

### 6. NodeManager启动之后又结束 ###

2018-02-06 16:50:31,210 ERROR org.apache.hadoop.yarn.server.nodemanager.NodeManager: Error starting NodeManager
    org.apache.hadoop.yarn.exceptions.YarnRuntimeException: org.apache.hadoop.yarn.exceptions.YarnRuntimeException: Received SHUTDOWN signal from Resourcemanager, Registration of NodeManager failed, Message from ResourceManager: NodeManager from  node4 doesn't satisfy minimum allocations, Sending SHUTDOWN signal to the NodeManager. Node capabilities are <memory:256, vCores:1>; minimums are 1024mb and 1 vcores
        at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.serviceStart(NodeStatusUpdaterImpl.java:259)
        at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
        at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:121)
        at org.apache.hadoop.yarn.server.nodemanager.NodeManager.serviceStart(NodeManager.java:451)
        at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
        at org.apache.hadoop.yarn.server.nodemanager.NodeManager.initAndStartNodeManager(NodeManager.java:834)
        at org.apache.hadoop.yarn.server.nodemanager.NodeManager.main(NodeManager.java:894)
    Caused by: org.apache.hadoop.yarn.exceptions.YarnRuntimeException: Received SHUTDOWN signal from Resourcemanager, Registration of NodeManager failed, Message from ResourceManager: NodeManager from  node4 doesn't satisfy minimum allocations, Sending SHUTDOWN signal to the NodeManager. Node capabilities are <memory:256, vCores:1>; minimums are 1024mb and 1 vcores
        at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.registerWithRM(NodeStatusUpdaterImpl.java:375)
        at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.serviceStart(NodeStatusUpdaterImpl.java:253)
        ... 6 more

解决办法：升级内存，NodeManager内存最小要求为1024M 和 1核CPU

### 7. hdfs 安全模式开(safe mode is on) ###

解决办法：

hadoop dfsadmin -safemode leave

[image]: /images/20220531/3173426dc0d54480999e79b52daff16c.png
[image 1]: /images/20220531/486b357b8cd447e0a18124fe4c1038d1.png
[Link 1]: http://www.oracle.com/technetwork/java/javase/downloads/index.html
[image 2]: /images/20220531/f18ba2c001454c65bd6e6a117d161ab3.png
[Link 2]: http://hadoop.apache.org/releases.html
[Link 3]: https://www.apache.org/dyn/closer.cgi/zookeeper/
[image 3]: /images/20220531/7a61dbc7761c43b7b86c17a42675dc27.png
[http_hadoop.apache.org_docs_r3.0.0_hadoop-project-dist_hadoop-hdfs_HDFSHighAvailabilityWithQJM.html]: http://hadoop.apache.org/docs/r3.0.0/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html
[http_hadoop.apache.org_docs_r3.0.0_hadoop-yarn_hadoop-yarn-site_ResourceManagerHA.html]: http://hadoop.apache.org/docs/r3.0.0/hadoop-yarn/hadoop-yarn-site/ResourceManagerHA.html
[image 4]: /images/20220531/fd397d1fe1bb4b2394070a3de9e22468.png
[image 5]: /images/20220531/e9b3193e46e646909b387c37de3c3b8d.png
[image 6]: /images/20220531/77e3cfd6d6f346aa88e6cba0eeb34882.png
[image 7]: /images/20220531/99910fd510ed46d189860a7cc1673235.png
[image 8]: /images/20220531/ea86e03147ac44c28c64fa42f5fbe4c3.png
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[image 10]: /images/20220531/440aafe4a5cd40e18e596b6cc2a96079.png
[image 11]: /images/20220531/85daa0eaf1164dbb8714b45a45aac125.png
[http_192.168.56.11_9870]: http://192.168.56.11:9870
[image 12]: /images/20220531/aba2cb3bc6c740c989a3a0bfe0093bd5.png
[image 13]: /images/20220531/e4744083e84241398c979bb792312f52.png
[image 14]: /images/20220531/b718f998b19343888608a74e47df6f48.png
[image 15]: /images/20220531/57e1aac35d77488f89c4ff1a8d350e25.png
[image 16]: /images/20220531/693c584749b14f4a81629304fb3eae86.png
[image 17]: /images/20220531/e1039ab8d94d441da5bb7c6e6e5d0c00.png