[BigData：Hadoop]：安装部署篇

文章目录

一：机器103设置密钥对免密登录
二：机器102设置密钥对免密登录
三：机器103安装Hadoop安装包
- 3.1：wget拉取安装Hadoop包
- 3.2：解压移到指定目录
- - 3.2.1：解压移动路径异常信息
  - 3.2.2：切换指定目录，进行解压，因为上述还是不行，应该是根目录解压有限制
  - 3.2.3：安装成功，查看Hadoop版本
  - - 3.2.3.1：显示JAVA_HOME未找到
  - 3.2.4：配置Hadoop的Java环境变量
  - 3.2.4.1：查看环境变量配置发现没有JAVA_HOME
  - 3.2.4.2：解决：查看java安装目录
  - 3.2.3：再次查看Hadoop版本

一：机器103设置密钥对免密登录

[root@vboxnode3ccccccttttttchenyang ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory ‘/root/.ssh’.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:

[root@vboxnode3ccccccttttttchenyang ~]# ls
anaconda-ks.cfg before-calico.yaml bigdata calico.yaml logs recommended.yaml
[root@vboxnode3ccccccttttttchenyang ~]# cd /root
[root@vboxnode3ccccccttttttchenyang ~]# ls
anaconda-ks.cfg before-calico.yaml bigdata calico.yaml logs recommended.yaml

[root@vboxnode3ccccccttttttchenyang ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:iDJChgXvhOSh9xBSNORW8fW8UeeHgTxwEYpbu3MPGUc root@vboxnode3ccccccttttttchenyang
The key’s randomart image is:
±–[RSA 2048]----+
|oBB o. . .o=+o |
|=*.+ . . + ++o o |
|++B . . * .E .|
|o= o . . o + . . |
|. + o . S o . . |
| . o . + |
| o + |
| o o |
| . |
±—[SHA256]-----+
[root@vboxnode3ccccccttttttchenyang ~]# cd /root/.ssh
[root@vboxnode3ccccccttttttchenyang .ssh]# ls
id_rsa id_rsa.pub

二：机器102设置密钥对免密登录

[root@vboxnode3ccccccttttttchenyang .ssh]# ssh-copy-id chenyang-mine-vbox02
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host 'chenyang-mine-vbox02 (192.168.56.102)' can't be established.
ECDSA key fingerprint is SHA256:SGpvRTxwvfuiJB6N+Gl0IRJZ0Bh4ggdISEqytykpPN8.
ECDSA key fingerprint is MD5:2e:91:01:39:bd:6f:b9:a8:3b:3d:9c:07:3c:81:bc:c7.
Are you sure you want to continue connecting (yes/no)? y
Please type 'yes' or 'no': yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@chenyang-mine-vbox02's password:
Permission denied, please try again.
root@chenyang-mine-vbox02's password:
Permission denied, please try again.
root@chenyang-mine-vbox02's password:
Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).

[root@vboxnode3ccccccttttttchenyang .ssh]# ssh chenyang-mine-vbox02
root@chenyang-mine-vbox02's password:
Last failed login: Sun Aug 27 22:58:22 CST 2023 from vboxnode3ccccccttttttchenyang on ssh:notty
There were 3 failed login attempts since the last successful login.
Last login: Sun Aug 27 22:52:26 2023 from 192.168.56.1
-bash: “export: 未找到命令
-bash: /etc/kubernetes/admin.conf: 没有那个文件或目录
-bash: /etc/kubernetes/kubelet.conf: 权限不够
-bash: “export: 未找到命令

[root@chenyang-mine-vbox02 ~]# ssh vboxnode3ccccccttttttchenyang
The authenticity of host 'vboxnode3ccccccttttttchenyang (192.168.56.103)' can't be established.
ECDSA key fingerprint is SHA256:SGpvRTxwvfuiJB6N+Gl0IRJZ0Bh4ggdISEqytykpPN8.
ECDSA key fingerprint is MD5:2e:91:01:39:bd:6f:b9:a8:3b:3d:9c:07:3c:81:bc:c7.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'vboxnode3ccccccttttttchenyang,192.168.56.103' (ECDSA) to the list of known hosts.
root@vboxnode3ccccccttttttchenyang's password:
Last login: Sun Aug 27 22:48:56 2023 from 192.168.56.1[root@vboxnode3ccccccttttttchenyang ~]# ls
anaconda-ks.cfg  before-calico.yaml  bigdata  calico.yaml  logs  recommended.yaml

三：机器103安装Hadoop安装包

3.1：wget拉取安装Hadoop包

wget https://mirrors.aliyun.com/apache/hadoop/common/hadoop-2.10.1/hadoop-2.10.1.tar.gz

wget https://mirrors.aliyun.com/apache/hadoop/common/hadoop-2.10.1/hadoop-2.10.1.tar.gz

[root@vboxnode3ccccccttttttchenyang ~]# wget https://mirrors.aliyun.com/apache/hadoop/common/hadoop-2.10.1/hadoop-2.10.1.tar.gz
--2023-08-27 22:59:48--  https://mirrors.aliyun.com/apache/hadoop/common/hadoop-2.10.1/hadoop-2.10.1.tar.gz
正在解析主机 mirrors.aliyun.com (mirrors.aliyun.com)... 182.40.60.209, 140.249.32.209, 150.139.245.176, ...
正在连接 mirrors.aliyun.com (mirrors.aliyun.com)|182.40.60.209|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：408587111 (390M) [application/octet-stream]
正在保存至: “hadoop-2.10.1.tar.gz”100%[=================================================================================>] 408,587,111 7.86MB/s 用时 37s2023-08-27 23:00:26 (10.5 MB/s) - 已保存 “hadoop-2.10.1.tar.gz” [408587111/408587111])

[root@vboxnode3ccccccttttttchenyang ~]# cd /usr/local/home/
[root@vboxnode3ccccccttttttchenyang home]# ;ls
-bash: 未预期的符号 `;' 附近有语法错误
[root@vboxnode3ccccccttttttchenyang home]# ls
bigdata  docker  log.file  sentinel-dashboard-1.8.6.jar  server
[root@vboxnode3ccccccttttttchenyang home]# cd bigdata/
[root@vboxnode3ccccccttttttchenyang bigdata]# ls
[root@vboxnode3ccccccttttttchenyang bigdata]# pwd
/usr/local/home/bigdata
[root@vboxnode3ccccccttttttchenyang bigdata]# cd ~
[root@vboxnode3ccccccttttttchenyang ~]# ls
anaconda-ks.cfg  before-calico.yaml  bigdata  calico.yaml  hadoop-2.10.1.tar.gz  logs  recommended.yaml

3.2：解压移到指定目录

3.2.1：解压移动路径异常信息

[root@vboxnode3ccccccttttttchenyang ~]# tar -zxvf hadoop-2.10.1.tar.gz //usr/local/home/bigdata
tar: //usr/local/home/bigdata：归档中找不到
tar: 由于前次错误，将以上次的错误状态退出
[root@vboxnode3ccccccttttttchenyang ~]# tar -zxvf hadoop-2.10.1.tar.gz /usr/local/home/bigdata
tar: /usr/local/home/bigdata：归档中找不到
tar: 由于前次错误，将以上次的错误状态退出
[root@vboxnode3ccccccttttttchenyang ~]# rm -rf bigdata/
[root@vboxnode3ccccccttttttchenyang ~]# ls
anaconda-ks.cfg  before-calico.yaml  calico.yaml  logs  recommended.yaml
[root@vboxnode3ccccccttttttchenyang ~]# wget https://mirrors.aliyun.com/apache/hadoop/common/hadoop-2.10.1/hadoop-2.10.1.tar.gz
--2023-08-27 23:04:49--  https://mirrors.aliyun.com/apache/hadoop/common/hadoop-2.10.1/hadoop-2.10.1.tar.gz
正在解析主机 mirrors.aliyun.com (mirrors.aliyun.com)... 140.249.32.209, 150.139.245.176, 117.24.169.248, ...
正在连接 mirrors.aliyun.com (mirrors.aliyun.com)|140.249.32.209|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：408587111 (390M) [application/octet-stream]
正在保存至: “hadoop-2.10.1.tar.gz”100%[=================================================================================>] 408,587,111 15.4MB/s 用时 50s2023-08-27 23:05:39 (7.80 MB/s) - 已保存 “hadoop-2.10.1.tar.gz” [408587111/408587111])

3.2.2：切换指定目录，进行解压，因为上述还是不行，应该是根目录解压有限制

切换指定目录，进行解压，因为上述还是不行，应该是根目录解压有限制

[root@vboxnode3ccccccttttttchenyang ~]# cd /usr/local/home/bigdata
[root@vboxnode3ccccccttttttchenyang bigdata]# ls
[root@vboxnode3ccccccttttttchenyang bigdata]# wget https://mirrors.aliyun.com/apache/hadoop/common/hadoop-2.10.1/hadoop-2.10.1.tar.gz
--2023-08-27 23:07:12--  https://mirrors.aliyun.com/apache/hadoop/common/hadoop-2.10.1/hadoop-2.10.1.tar.gz
正在解析主机 mirrors.aliyun.com (mirrors.aliyun.com)... 182.40.60.209, 150.139.245.178, 150.139.245.179, ...
正在连接 mirrors.aliyun.com (mirrors.aliyun.com)|182.40.60.209|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：408587111 (390M) [application/octet-stream]
正在保存至: “hadoop-2.10.1.tar.gz”100%[=================================================================================>] 408,587,111 15.1MB/s 用时 26s2023-08-27 23:07:38 (15.1 MB/s) - 已保存 “hadoop-2.10.1.tar.gz” [408587111/408587111])

[root@vboxnode3ccccccttttttchenyang bigdata]# ls
hadoop-2.10.1.tar.gz
[root@vboxnode3ccccccttttttchenyang bigdata]# tar -zxvf hadoop-2.10.1.tar.gz
hadoop-2.10.1/
hadoop-2.10.1/bin/
hadoop-2.10.1/bin/hadoop
hadoop-2.10.1/bin/hadoop.cmd
hadoop-2.10.1/bin/rcc
hadoop-2.10.1/bin/hdfs
hadoop-2.10.1/bin/hdfs.cmd
hadoop-2.10.1/bin/container-executor
hadoop-2.10.1/bin/test-container-executor
hadoop-2.10.1/bin/yarn
hadoop-2.10.1/bin/yarn.cmd
hadoop-2.10.1/bin/mapred
hadoop-2.10.1/bin/mapred.cmd
hadoop-2.10.1/etc/
hadoop-2.10.1/etc/hadoop/
hadoop-2.10.1/etc/hadoop/core-site.xml
hadoop-2.10.1/etc/hadoop/ssl-client.xml.example
hadoop-2.10.1/etc/hadoop/ssl-server.xml.example
hadoop-2.10.1/etc/hadoop/hadoop-env.cmd
hadoop-2.10.1/etc/hadoop/hadoop-env.sh
hadoop-2.10.1/etc/hadoop/hadoop-metrics.properties
hadoop-2.10.1/etc/hadoop/hadoop-metrics2.properties
hadoop-2.10.1/etc/hadoop/hadoop-policy.xml
hadoop-2.10.1/etc/hadoop/log4j.properties
hadoop-2.10.1/etc/hadoop/hdfs-site.xml
hadoop-2.10.1/etc/hadoop/httpfs-log4j.properties
hadoop-2.10.1/etc/hadoop/httpfs-site.xml
hadoop-2.10.1/etc/hadoop/httpfs-env.sh
hadoop-2.10.1/etc/hadoop/httpfs-signature.secret
hadoop-2.10.1/etc/hadoop/kms-acls.xml
hadoop-2.10.1/etc/hadoop/kms-env.sh
hadoop-2.10.1/etc/hadoop/kms-log4j.properties
hadoop-2.10.1/etc/hadoop/kms-site.xml
hadoop-2.10.1/etc/hadoop/yarn-env.cmd
hadoop-2.10.1/etc/hadoop/yarn-site.xml
hadoop-2.10.1/etc/hadoop/container-executor.cfg
hadoop-2.10.1/etc/hadoop/slaves
hadoop-2.10.1/etc/hadoop/yarn-env.sh
hadoop-2.10.1/etc/hadoop/capacity-scheduler.xml
hadoop-2.10.1/etc/hadoop/configuration.xsl
hadoop-2.10.1/etc/hadoop/mapred-queues.xml.template
hadoop-2.10.1/etc/hadoop/mapred-env.cmd
hadoop-2.10.1/etc/hadoop/mapred-env.sh
hadoop-2.10.1/etc/hadoop/mapred-site.xml.template
hadoop-2.10.1/lib/
hadoop-2.10.1/lib/native/
hadoop-2.10.1/lib/native/examples/
hadoop-2.10.1/lib/native/examples/pipes-sort
hadoop-2.10.1/lib/native/examples/wordcount-nopipe
hadoop-2.10.1/lib/native/examples/wordcount-part
hadoop-2.10.1/lib/native/examples/wordcount-simple
hadoop-2.10.1/lib/native/libhadoop.a
hadoop-2.10.1/lib/native/libhadoop.so
hadoop-2.10.1/lib/native/libhadoop.so.1.0.0
hadoop-2.10.1/lib/native/libhdfs.a
hadoop-2.10.1/lib/native/libhdfs.so
hadoop-2.10.1/lib/native/libhdfs.so.0.0.0
hadoop-2.10.1/lib/native/libhadooputils.a
hadoop-2.10.1/lib/native/libhadooppipes.a
hadoop-2.10.1/libexec/
hadoop-2.10.1/libexec/hadoop-config.cmd
hadoop-2.10.1/libexec/hadoop-config.sh
hadoop-2.10.1/libexec/hdfs-config.cmd
hadoop-2.10.1/libexec/hdfs-config.sh
hadoop-2.10.1/libexec/httpfs-config.sh
hadoop-2.10.1/libexec/kms-config.sh
hadoop-2.10.1/libexec/yarn-config.cmd
hadoop-2.10.1/libexec/yarn-config.sh
hadoop-2.10.1/libexec/mapred-config.cmd
hadoop-2.10.1/libexec/mapred-config.sh
hadoop-2.10.1/sbin/
hadoop-2.10.1/sbin/FederationStateStore/
hadoop-2.10.1/sbin/FederationStateStore/MySQL/
hadoop-2.10.1/sbin/FederationStateStore/MySQL/FederationStateStoreDatabase.sql
hadoop-2.10.1/sbin/FederationStateStore/MySQL/FederationStateStoreStoredProcs.sql
hadoop-2.10.1/sbin/FederationStateStore/MySQL/FederationStateStoreUser.sql
hadoop-2.10.1/sbin/FederationStateStore/MySQL/dropDatabase.sql
hadoop-2.10.1/sbin/FederationStateStore/MySQL/dropStoreProcedures.sql
hadoop-2.10.1/sbin/FederationStateStore/MySQL/dropTables.sql
hadoop-2.10.1/sbin/FederationStateStore/MySQL/dropUser.sql
hadoop-2.10.1/sbin/FederationStateStore/MySQL/FederationStateStoreTables.sql
hadoop-2.10.1/sbin/FederationStateStore/SQLServer/
hadoop-2.10.1/sbin/FederationStateStore/SQLServer/FederationStateStoreStoreProcs.sql
hadoop-2.10.1/sbin/FederationStateStore/SQLServer/FederationStateStoreTables.sql
hadoop-2.10.1/sbin/stop-all.sh
hadoop-2.10.1/sbin/start-all.cmd
hadoop-2.10.1/sbin/stop-all.cmd
hadoop-2.10.1/sbin/hadoop-daemon.sh
hadoop-2.10.1/sbin/hadoop-daemons.sh
hadoop-2.10.1/sbin/slaves.sh
hadoop-2.10.1/sbin/start-all.sh
hadoop-2.10.1/sbin/distribute-exclude.sh
hadoop-2.10.1/sbin/hdfs-config.cmd
hadoop-2.10.1/sbin/start-dfs.cmd
hadoop-2.10.1/sbin/stop-dfs.cmd
hadoop-2.10.1/sbin/hdfs-config.sh
hadoop-2.10.1/sbin/refresh-namenodes.sh
hadoop-2.10.1/sbin/start-balancer.sh
hadoop-2.10.1/sbin/start-dfs.sh
hadoop-2.10.1/sbin/start-secure-dns.sh
hadoop-2.10.1/sbin/stop-balancer.sh
hadoop-2.10.1/sbin/stop-dfs.sh
hadoop-2.10.1/sbin/stop-secure-dns.sh
hadoop-2.10.1/sbin/httpfs.sh
hadoop-2.10.1/sbin/kms.sh
hadoop-2.10.1/sbin/start-yarn.cmd
hadoop-2.10.1/sbin/stop-yarn.cmd
hadoop-2.10.1/sbin/start-yarn.sh
hadoop-2.10.1/sbin/stop-yarn.sh
hadoop-2.10.1/sbin/yarn-daemon.sh
hadoop-2.10.1/sbin/yarn-daemons.sh
hadoop-2.10.1/sbin/mr-jobhistory-daemon.sh
hadoop-2.10.1/share/
hadoop-2.10.1/share/doc/
hadoop-2.10.1/share/doc/hadoop/
hadoop-2.10.1/share/doc/hadoop/common/
hadoop-2.10.1/share/doc/hadoop/common/api/

3.2.3：安装成功，查看Hadoop版本

3.2.3.1：显示JAVA_HOME未找到

hadoop version
[root@vboxnode3ccccccttttttchenyang bigdata]# hadoop version
Error: JAVA_HOME is not set and could not be found.

3.2.4：配置Hadoop的Java环境变量

在这里插入图片描述

[root@vboxnode3ccccccttttttchenyang bigdata]# vi /etc/profile
[root@vboxnode3ccccccttttttchenyang bigdata]# java -version
openjdk version "1.8.0_362"
OpenJDK Runtime Environment (build 1.8.0_362-b08)
OpenJDK 64-Bit Server VM (build 25.362-b08, mixed mode)
[root@vboxnode3ccccccttttttchenyang bigdata]# javac
用法: javac <options> <source files>
其中, 可能的选项包括:-g                         生成所有调试信息-g:none                    不生成任何调试信息-g:{lines,vars,source}     只生成某些调试信息-nowarn                    不生成任何警告-verbose                   输出有关编译器正在执行的操作的消息-deprecation               输出使用已过时的 API 的源位置-classpath <路径>            指定查找用户类文件和注释处理程序的位置-cp <路径>                   指定查找用户类文件和注释处理程序的位置-sourcepath <路径>           指定查找输入源文件的位置-bootclasspath <路径>        覆盖引导类文件的位置-extdirs <目录>              覆盖所安装扩展的位置-endorseddirs <目录>         覆盖签名的标准路径的位置-proc:{none,only}          控制是否执行注释处理和/或编译。-processor <class1>[,<class2>,<class3>...] 要运行的注释处理程序的名称; 绕过默认的搜索进程-processorpath <路径>        指定查找注释处理程序的位置-parameters                生成元数据以用于方法参数的反射-d <目录>                    指定放置生成的类文件的位置-s <目录>                    指定放置生成的源文件的位置-h <目录>                    指定放置生成的本机标头文件的位置-implicit:{none,class}     指定是否为隐式引用文件生成类文件-encoding <编码>             指定源文件使用的字符编码-source <发行版>              提供与指定发行版的源兼容性-target <发行版>              生成特定 VM 版本的类文件-profile <配置文件>            请确保使用的 API 在指定的配置文件中可用-version                   版本信息-help                      输出标准选项的提要-A关键字[=值]                  传递给注释处理程序的选项-X                         输出非标准选项的提要-J<标记>                     直接将 <标记> 传递给运行时系统-Werror                    出现警告时终止编译@<文件名>                     从文件读取选项和文件名

3.2.4.1：查看环境变量配置发现没有JAVA_HOME

[root@vboxnode3ccccccttttttchenyang bigdata]# export
declare -x HADOOP_HOME="/usr/local/home/bigdata/hadoop-2.10.1"
declare -x HISTCONTROL="ignoredups"
declare -x HISTSIZE="1000"
declare -x HOME="/root"
declare -x HOSTNAME="vboxnode3ccccccttttttchenyang"
declare -x KUBECONFIG="/etc/kubernetes/kubelet.conf"
declare -x LANG="zh_CN.UTF-8"
declare -x LESSOPEN="||/usr/bin/lesspipe.sh %s"
declare -x LOGNAME="root"
declare -x LS_COLORS="rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=01;05;37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=01;36:*.au=01;36:*.flac=01;36:*.mid=01;36:*.midi=01;36:*.mka=01;36:*.mp3=01;36:*.mpc=01;36:*.ogg=01;36:*.ra=01;36:*.wav=01;36:*.axa=01;36:*.oga=01;36:*.spx=01;36:*.xspf=01;36:"
declare -x MAIL="/var/spool/mail/root"
declare -x OLDPWD="/root"
declare -x PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local/home/bigdata/hadoop-2.10.1/bin:/usr/local/home/bigdata/hadoop-2.10.1/sbin"
declare -x PWD="/usr/local/home/bigdata"
declare -x SELINUX_LEVEL_REQUESTED=""
declare -x SELINUX_ROLE_REQUESTED=""
declare -x SELINUX_USE_CURRENT_RANGE=""
declare -x SHELL="/bin/bash"
declare -x SHLVL="1"
declare -x SSH_CLIENT="192.168.56.102 48468 22"
declare -x SSH_CONNECTION="192.168.56.102 48468 192.168.56.103 22"
declare -x SSH_TTY="/dev/pts/1"
declare -x TERM="xterm"
declare -x USER="root"
declare -x XDG_RUNTIME_DIR="/run/user/0"
declare -x XDG_SESSION_ID="3"

3.2.4.2：解决：查看java安装目录

关于命令：ls -lr
列出目录中的文件和子目录列表。但是，ls-lr命令可以递归地列出指定目录下的所有的子目录文件和信息，并按照文件修改时间的顺序排序。
如果想在指定目录下，查看所有文件和子目录的详细信息并且以递归形式展示，可以使用“ls -lR”命令。
关于命令：ls -lrt 实际上是代表了 “-l -r -t” 这三个选项集合。

[root@vboxnode3ccccccttttttchenyang bigdata]# which java
/usr/bin/java
[root@vboxnode3ccccccttttttchenyang bigdata]# ls -lr /usr/bin/java
lrwxrwxrwx. 1 root root 22 4月   7 19:15 /usr/bin/java -> /etc/alternatives/java
[root@vboxnode3ccccccttttttchenyang bigdata]# ls -lrt /etc/alternatives/java
lrwxrwxrwx. 1 root root 73 4月   7 19:15 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.362.b08-1.el7_9.x86_64/jre/bin/java/
找到安装目录：/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.362.b08-1.el7_9.x86_64
[root@vboxnode3ccccccttttttchenyang ~]# echo $JAVA_HOME
[root@vboxnode3ccccccttttttchenyang ~]# vi /etc/profile
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.362.b08-1.el7_9.x86_64
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATHexport PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL
export HADOOP_HOME=/usr/local/home/bigdata/hadoop-2.10.1
export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin:$JAVA_HOME:$JRE_HOME/lib:$CLASSPATH
已经可以查看到JAVA_HOME
[root@vboxnode3ccccccttttttchenyang ~]# export
declare -x CLASSPATH="/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.362.b08-1.el7_9.x86_64/lib:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.362.b08-1.el7_9.x86_64/jre/lib:"
declare -x HADOOP_HOME="/usr/local/home/bigdata/hadoop-2.10.1"
declare -x HISTCONTROL="ignoredups"
declare -x HISTSIZE="1000"
declare -x HOME="/root"
declare -x HOSTNAME="vboxnode3ccccccttttttchenyang"
declare -x JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.362.b08-1.el7_9.x86_64"
declare -x JRE_HOME="/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.362.b08-1.el7_9.x86_64/jre"
declare -x KUBECONFIG="/etc/kubernetes/kubelet.conf"
declare -x LANG="zh_CN.UTF-8"
declare -x LESSOPEN="||/usr/bin/lesspipe.sh %s"
declare -x LOGNAME="root"
[root@vboxnode3ccccccttttttchenyang ~]# echo $JAVA_HOME
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.362.b08-1.el7_9.x86_64

3.2.3：再次查看Hadoop版本

[root@vboxnode3ccccccttttttchenyang ~]# hadoop version
Hadoop 2.10.1
Subversion https://github.com/apache/hadoop -r 1827467c9a56f133025f28557bfc2c562d78e816
Compiled by centos on 2020-09-14T13:17Z
Compiled with protoc 2.5.0
From source with checksum 3114edef868f1f3824e7d0f68be03650
This command was run using /usr/local/home/bigdata/hadoop-2.10.1/share/hadoop/common/hadoop-common-2.10.1.jar