修改hostname

[root@centos7 ~]$ hostnamectl set-hostname hadoop001 # 使用这个命令会立即生效且重启也生效[root@centos7 ~]$ hostname # 查看下hadoop001[root@centos7 ~]$ vim /etc/hosts # 编辑下hosts文件， 给127.0.0.1添加hostname[root@centos7 ~]$ cat /etc/hosts # 检查127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 hadoop001::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

 

免密码登录

scp id_rsa.pub lau@192.168.1.108:/home/lau/.ssh/pub_key#登录用户cd ~/.ssh/cat pub_key >> authorized_keyschmod 600 /home/lau/.ssh/authorized_keys