大数据入门学习 -2025/8/4

Centos7配置JDK环境

[hadoop@node3 ~]$ su
Password:
[root@node3 hadoop]#
[root@node3 hadoop]#
[root@node3 hadoop]# mkdir -p /export/server
[root@node3 hadoop]#
[root@node3 hadoop]# tar -zxvf jdk-8u351-linux-x64.tar.gz -C /export/server
tar (child): jdk-8u351-linux-x64.tar.gz: Cannot open: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now
[root@node3 hadoop]# ll
total 135512
-rw-rw-r--. 1 hadoop hadoop 138762230 Aug  4 07:23 jdk-8u361-linux-x64.tar.gz
[root@node3 hadoop]# tar -zxvf jdk-8u361-linux-x64.tar.gz -C /export/server

[root@node3 hadoop]#
[root@node3 hadoop]#
[root@node3 hadoop]# cd /export/server
[root@node3 server]# ll
total 4
drwxr-xr-x. 8 root root 4096 Aug  4 07:25 jdk1.8.0_361
[root@node3 server]# ln -s /export/server/jdk1.8.0_361 /export/server/jdk
[root@node3 server]#
[root@node3 server]# vim /etc/profile
[root@node3 server]#
[root@node3 server]#
[root@node3 server]#
[root@node3 server]# source /etc/profile
[root@node3 server]#
[root@node3 server]# rm -f /usr/bin/java
[root@node3 server]# ln -s /export/server/jdk/bin/java /usr/bin/java
[root@node3 server]#
[root@node3 server]# java -version
java version "1.8.0_361"
Java(TM) SE Runtime Environment (build 1.8.0_361-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.361-b09, mixed mode)
[root@node3 server]# javac -version
javac 1.8.0_361
[root@node3 server]#

关闭防火墙和SELinux

31  systemctl stop firewalld
   32  systemctl disable firewalld
   33  vim /etc/sysconfig/selinux
   34  init 6

修改时区并设置自动时间同步

Centos yum切换国内阿里源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
vi /etc/yum.repos.d/CentOS-Base.repo

[base]
name=CentOS-7 - Base
baseurl=https://mirrors.aliyun.com/centos-vault/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-7 - Updates
baseurl=https://mirrors.aliyun.com/centos-vault/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-7 - Extras
baseurl=https://mirrors.aliyun.com/centos-vault/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7


yum clean all
yum makecache
yum install -y ntp

修改时区并设置自动时间同步

[root@node3 hadoop]# rm -f /etc/localtime;sudo ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
[root@node3 hadoop]# ntpdate -u ntp.aliyun.com
 5 Aug 19:26:33 ntpdate[8160]: adjust time server 203.107.6.88 offset 0.003468 sec
[root@node3 hadoop]# date
Tue Aug  5 19:26:41 CST 2025
[root@node3 hadoop]#
[root@node3 hadoop]# systemctl start ntpd
[root@node3 hadoop]# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.