Linux修改hostname与免密码登录的方法

  [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

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