安装Linux操作系统后的tips

1.   关闭防火墙 systemctl stop firewalld.service
2.  永久关闭防火墙 systemctl disable firewalld.service
3. vim /etc/selinux/config 修改为SELINUX=disabled
4. 临时关闭selinux：setenforce 0 使用getenforce 0查看如果结果是Permissive则关闭成功
5. 挂载大容量磁盘

   parted /dev/sdb -s mklabel gpt
   parted /dev/sdb -s mkpart logical ext4 0 100%
   mkfs.ext4 /dev/sdb1
   mkdir /data
   mount /dev/sdb1 /data
   blkid|grep /dev/sdb1 |awk -F '\"' '{print $2}' |xargs -I {} echo UUID={} /data ext4 defaults,noatime,nodiratime 1 0 >>/etc/fstab

6. 修改主机名：

1. 编辑network文件：vi /etc/sysconfig/network  HOSTNAME=hadoop01

2. 让network文件重新生效：source /etc/sysconfig/network

7. 配置hosts文件，将主机名和ip地址进行映射

        编辑hosts文件：vim /etc/hosts  192.168.64.132 hadoop01

8. 卸载rpm安装的jkd版本 
   查看安装的jdk： 
   #rpm -qa|grep jdk 
   可能看到如下类似的信息： 
   jdk-1.6.0_22-fcs 
   卸载： rpm -e --nodeps jdk-1.6.0_22-fcs 

9. 查看jdk版本：rpm -qa | grep java

10. 卸载9中出现的文件rpm -e --nodeps tzdata-java-2018d-1.el7.noarch

11. jdk和hadoop安装见我另一篇bloghttps://blog.youkuaiyun.com/zaizuxuan/article/details/103645058?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522163162655116780265454664%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=163162655116780265454664&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_v2~rank_v29-2-103645058.pc_v2_rank_blog_default&utm_term=hadoop&spm=1018.2226.3001.4450