一.start-dfs.sh（開啟不成功）
原因：1.dadoop? ?文件所屬者 與 執(zhí)行時 登陸者不一致（權(quán)限不足）
? ? ????????????報錯：
WARNING: HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER. Using value of HADOOP_SECURE_DN_USER.
Starting namenodes on [centos7]
centos7: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
Starting datanodes
localhost: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
Starting secondary namenodes [centos7]
centos7: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
log4j:ERROR setFile(null,true) call failed.
java.io.FileNotFoundException: /hadoop/hadoop-3.2.0/logs/fairscheduler-statedump.log (權(quán)限不夠)
at java.io.FileOutputStream.open0(Native Method)
at java.io.FileOutputStream.open(FileOutputStream.java:270)
at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
at java.io.FileOutputStream.<init>(FileOutputStream.java:133)
at org.apache.log4j.FileAppender.setFile(FileAppender.java:294)
at org.apache.log4j.RollingFileAppender.setFile(RollingFileAppender.java:207)
at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:165)
at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:307)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:172)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:104)
at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:842)
at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768)
at org.apache.log4j.PropertyConfigurator.parseCatsAndRenderers(PropertyConfigurator.java:672)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:516)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:580)
at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:526)
at org.apache.log4j.LogManager.<clinit>(LogManager.java:127)
at org.slf4j.impl.Log4jLoggerFactory.<init>(Log4jLoggerFactory.java:66)
at org.slf4j.impl.StaticLoggerBinder.<init>(StaticLoggerBinder.java:72)
at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:45)
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
at org.apache.hadoop.conf.Configuration.<clinit>(Configuration.java:227)
at org.apache.hadoop.hdfs.tools.GetConf.<clinit>(GetConf.java:131)
二.使用root配置的hadoop并啟動會出現(xiàn)報錯
錯誤：
??????? Starting namenodes on [master]
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 secondary namenodes [slave1]
??????? ERROR: Attempting to operate on hdfs secondarynamenode as root
??????? ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
解決方法：
在/hadoop/sbin路徑下：?
將start-dfs.sh，stop-dfs.sh兩個文件頂部添加以下參數(shù)
HDFS_DATANODE_USER=root
HADOOP_SECURE_DN_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root
start-yarn.sh，stop-yarn.sh頂部也需添加以下
YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root
2、添加1后出現(xiàn)以下錯誤
WARNING: HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER. Using value of HADOOP_SECURE_DN_USER.
Starting namenodes on [mylinux_1]
mylinux_1: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
Starting datanodes
localhost: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
Starting secondary namenodes [mylinux_1]
mylinux_1: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
2018-11-26 09:32:18,082 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Starting resourcemanager
Starting nodemanagers
localhost: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
解決辦法：配置免密登錄（注意：對本機(jī)也需要配置）
ssh-keygen -t rsa
ssh-copy-id -i ~/.ssh/id_rsa.pub root@localhost
三.執(zhí)行jps 沒有 nodemanager
原因是：yarn-site.xml 配置出現(xiàn)了問題
在yarn-site.xml添加
<property>
? ? <name>yarn.nodemanager.resource.cpu-vcores</name>
? ? <value>你的cpu個數(shù)</value>
</property>
? ? ? ? <property>
? ? ? ? <name> yarn.nodemanager.resource.memory-mb </name>
? ? ? ? <value> 你的內(nèi)存</value>
? ? </property>
