Hadoop2.6.0 + 云centos +伪分布式 --->只谈部署
[*] 3.0.3玩不好，现将2.6.0tar.gz上传到 / usr, chmod -R hadoop:hadop hadoop-2.6.0 ， rm掉3.0.3
2.在/etc/profile中 配置java的环境配置, hadoop环境配置
ssh免密登录配置 （查看之前记录）
3. 配置文件
hadoop-env.sh中配置java环境
core-sit.xml
官网上没有提到 端口9000这个配置，但是如果不添加， start-dfs.sh的时候会出现如下错误：
Incorrect configuration: namenode address dfs.namenode.servicerpc-address or dfs.namenode.rpc-address is not configured.
hdfs-site.xml
参数描述 默认 配置文件例子值dfs.name.dirname node的元数据,以,号隔开,hdfs会把元数据冗余复制到这些目录，一般这些目录是不同的块设备，不存在的目录会被忽略掉 {hadoop.tmp.dir}
/dfs/name
hdfs-site.xm/hadoop/hdfs/namedfs.name.edits.dir node node的事务文件存储的目录,以,号隔开,hdfs会把事务文件冗余复制到这些目录，一般这些目录是不同的块设备，不存在的目录会被忽略掉${dfs.name.dir}/current??hdfs-site.xm${
4.格式化文件系统
# hadoop namenode –format
[root@zui hadoop]# hadoop namenode -format (因为这里用到了root用户， 所以start-dfs.sh如果不在root下执行，启动不了namenode / datanode and secondnamenode , yarn没有关系)
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.
18/07/23 17:03:28 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = zui/182.61.17.191
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 2.6.0
STARTUP_MSG: classpath =/***********各种jar包的path/
STARTUP_MSG: build = https://git-wip-us.apache.org/repos/asf/hadoop.git -r e34 96499ecb8d220fba99dc5ed4c99c8f9e33bb1; compiled by 'jenkins' on 2014-11-13T21:10 Z
STARTUP_MSG: java = 1.8.0_152
************************************************************/
18/07/23 17:03:29 INFO namenode.NameNode: registered UNIX signal handlers for
18/07/23 17:03:29 INFO namenode.NameNode: createNameNode [-format]
Formatting using clusterid: CID-cb98355b-6a1d-47a2-964c-48dc32752b55
18/07/23 17:03:30 INFO namenode.FSNamesystem: No KeyProvider found.
18/07/23 17:03:30 INFO namenode.FSNamesystem: fsLock is fair:true
18/07/23 17:03:30 INFO blockmanagement.DatanodeManager: dfs.block.invalidate.limit=1000
18/07/23 17:03:30 INFO blockmanagement.DatanodeManager: dfs.namenode.datanode.registration.ip-hostname-check=true
18/07/23 17:03:30 INFO blockmanagement.BlockManager: dfs.namenode.startup.delay.block.deletion.sec is set to 000:00:00:00.000
18/07/23 17:03:30 INFO blockmanagement.BlockManager: The block deletion will start around 2018 Jul 23 17:03:30
18/07/23 17:03:30 INFO util.GSet: Computing capacity for map BlocksMap
18/07/23 17:03:30 INFO util.GSet: VM type = 64-bit
18/07/23 17:03:30 INFO util.GSet: 2.0% max memory 966.7 MB = 19.3 MB
18/07/23 17:03:30 INFO util.GSet: capacity = 2^21 = 2097152 entries
18/07/23 17:03:30 INFO blockmanagement.BlockManager: dfs.block.access.token.enable=false
18/07/23 17:03:30 INFO blockmanagement.BlockManager: defaultReplication= 1
18/07/23 17:03:30 INFO blockmanagement.BlockManager: maxReplication= 512
18/07/23 17:03:30 INFO blockmanagement.BlockManager: minReplication= 1
18/07/23 17:03:30 INFO blockmanagement.BlockManager: maxReplicationStreams= 2
18/07/23 17:03:30 INFO blockmanagement.BlockManager: shouldCheckForEnoughRacks = false
18/07/23 17:03:30 INFO blockmanagement.BlockManager: replicationRecheckInterval= 3000
18/07/23 17:03:30 INFO blockmanagement.BlockManager: encryptDataTransfer= false
18/07/23 17:03:30 INFO blockmanagement.BlockManager: maxNumBlocksToLog= 1000
18/07/23 17:03:30 INFO namenode.FSNamesystem: fsOwner = root (auth:SIMPLE)
18/07/23 17:03:30 INFO namenode.FSNamesystem: supergroup = supergroup
18/07/23 17:03:30 INFO namenode.FSNamesystem: isPermissionEnabled = true
18/07/23 17:03:30 INFO namenode.FSNamesystem: HA Enabled: false
18/07/23 17:03:30 INFO namenode.FSNamesystem: Append Enabled: true
18/07/23 17:03:31 INFO util.GSet: Computing capacity for map INodeMap
18/07/23 17:03:31 INFO util.GSet: VM type = 64-bit
18/07/23 17:03:31 INFO util.GSet: 1.0% max memory 966.7 MB = 9.7 MB
18/07/23 17:03:31 INFO util.GSet: capacity = 2^20 = 1048576 entries
18/07/23 17:03:31 INFO namenode.NameNode: Caching file names occuring more than 10 times
18/07/23 17:03:31 INFO util.GSet: Computing capacity for map cachedBlocks
18/07/23 17:03:31 INFO util.GSet: VM type = 64-bit
18/07/23 17:03:31 INFO util.GSet: 0.25% max memory 966.7 MB = 2.4 MB
18/07/23 17:03:31 INFO util.GSet: capacity = 2^18 = 262144 entries
18/07/23 17:03:31 INFO namenode.FSNamesystem: dfs.namenode.safemode.threshold-pct = 0.9990000128746033
18/07/23 17:03:31 INFO namenode.FSNamesystem: dfs.namenode.safemode.min.datanodes = 0
18/07/23 17:03:31 INFO namenode.FSNamesystem: dfs.namenode.safemode.extension= 30000
18/07/23 17:03:31 INFO namenode.FSNamesystem: Retry cache on namenode is enabled
18/07/23 17:03:31 INFO namenode.FSNamesystem: Retry cache will use 0.03 of total heap and retry cache entry expiry time is 600000 millis
18/07/23 17:03:31 INFO util.GSet: Computing capacity for map NameNodeRetryCache
18/07/23 17:03:31 INFO util.GSet: VM type = 64-bit
18/07/23 17:03:31 INFO util.GSet: 0.029999999329447746% max memory 966.7 MB = 297.0 KB
18/07/23 17:03:31 INFO util.GSet: capacity = 2^15 = 32768 entries
18/07/23 17:03:31 INFO namenode.NNConf: ACLs enabled? false
18/07/23 17:03:31 INFO namenode.NNConf: XAttrs enabled? true
18/07/23 17:03:31 INFO namenode.NNConf: Maximum> 18/07/23 17:03:31 INFO namenode.FSImage: Allocated new BlockPoolId: BP-702429615-182.61.17.191-1532336611838
18/07/23 17:03:31 INFO common.Storage: Storage directory /usr/hadoop-2.6.0/data/tmp/dfs/name has been successfully formatted.
18/07/23 17:03:32 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0
18/07/23 17:03:32 INFO util.ExitUtil: Exiting with status 0
18/07/23 17:03:32 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at zui/182.61.17.191
************************************************************/
# # hadoop namenode -format
-bash: [root@zui: command not found
# DEPRECATED: Use of this script to execute hdfs command is deprecated.
-bash: DEPRECATED:: command not found
# Instead use the hdfs command for it.
-bash: Instead: command not found
#
# 18/07/23 17:03:28 INFO namenode.NameNode: STARTUP_MSG:
-bash: 18/07/23: No such file or directory
# /************************************************************
-bash: /appd.log: Text file busy
# STARTUP_MSG: Starting NameNode
-bash: STARTUP_MSG:: command not found
# STARTUP_MSG: host = zui/182.61.17.191
-bash: STARTUP_MSG:: command not found
# STARTUP_MSG: args = [-format]
-bash: STARTUP_MSG:: command not found
# STARTUP_MSG: version = 2.6.0
-bash: STARTUP_MSG:: command not found
格式化成功,这里我把打印的信息贴上了，深入的学习是需要分析的
5.
执行 start-dfs.sh
检查 结果jps
6.通过浏览器访问 : http://公网ip:50070/
来张大图爽快一把
全文参考： https://blog.csdn.net/liuge36/article/details/78353930
如有雷同，全属抄袭
2018 07 23
Hadoop中的资源调度 ： yarn
mapreduce-site.xml
yarn-site.xml
切换到hadoop用户，执行 start-yarn.sh， 因为免密配置是在hadoop用户下操作的，如果root用户，需要一次次输入密码
因为之前start-dfs的操作是在root下操作的，所以log文件对hadoop用户 Permission denied
检查如下;
将logs用户和组 assign给 hadoop (提示：免密登录在什么用户下配置的，后面hadoop任何操作都要在这个user下 1.其他用户操作不知要输入多少次密码，如果一百次操作都要输入pwd你会晕挂的 2.假使前面用了root，后面恍然大悟切回到hadoop用户了，但是有些生成的文件是root用户和组，如果hadoop下也需要操作这些目录那么明显没有权限，运行检查发现100个文件，运气好也许一个 chown -R就好了，运气不好 100次 chown你来试试)
再次执行 start-yarn.sh
查看 ，为什么没有显示 namenode 和 datanode的进程， 此时http://182.61.**.***:50070也还是可以访问的呀 ？？？？
在浏览器输入，OK， 看到下面结果，伪分布式搭建完成
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