hadoop 主机免密设置
hadoop三台主机免密设置
文件权限
.ssh 700 id_rsa 600 id_rsa.pub 644
环境rhel8 需要三台主机
master slave1 slave2
配置三台主机同一网段 10.10.10.0/24
[root@maoqiyang network-scripts]# nmcli connection add con-name supermao ifname ens160 ipv4.method manual ipv4.addresses 10.10.10.128/24 ipv4.gateway 10.10.10.2 ipv4.dns 114.114.114.114 type ethernet
master 10.10.10.128
slave1 10.10.10.129
slave2 10.10.10.130
三台主机配置/etc/hosts
10.10.10.128 master master.example.com
10.10.10.129 slave1 slave1.example.com
10.10.10.130 slave2 slave2.example.com
三台主机修改 /etc/ssh.config
sed -i '/PubkeyA*/ s/#//' /etc/ssh/sshd_config
systemctl restart sshd
(默认开启,可改可不改)
三台主机创建hadoop用户并切换到hadoop
useradd hadoop && echo 123 | passwd --stdin hadoop
su - hadoop
三台主机一定得切换到hadoop
master
生成秘钥并配置免密ssh登录自己
方式一
ssh-keygen -t rsa -P ''
(一直回车)
cat id_rsa.pub > authorized_keys
chmod 600 authorized_keys
ssh hadoop@localhost
登录slave1和slave2
#slave1
[hadoop@master ~]$ scp ~/.ssh/id_rsa.pub hadoop@slave1:~/
##切换到slave1 虚拟机
[hadoop@slave1 ~]$ cat id_rsa.pub > ~/.ssh/authorized_keys
[hadoop@slave1 .ssh]$ chmod 600 authorized_keys
[hadoop@master ~]$ ssh hadoop@slave1
#slave2
[hadoop@master ~]$ scp ~/.ssh/id_rsa.pub hadoop@slave1:~/
##切换到slave2 虚拟机
[hadoop@slave2 ~]$ cat id_rsa.pub > ~/.ssh/authorized_keys
[hadoop@slave2 .ssh]$ chmod 600 authorized_keys
[hadoop@master ~]$ ssh hadoop@slave2
slave1
生成秘钥并配置免密ssh登录自己
方式一
ssh-keygen -t rsa -P ''
(一直回车)
cat id_rsa.pub > authorized_keys
chmod 600 authorized_keys
ssh hadoop@localhost
登录master和slave2
类似master,省略
slave2
生成秘钥并配置免密ssh登录自己
方式二
ssh-keygen -t rsa -P ''
(一直回车)
ssh-copy-id hadoop@localhost
yes 并且 输入当前hadoop密码
ssh hadoop@localhost
登录slave1和master
ssh-copy-id hadoop@master
yes 并且 输入当前hadoop密码
ssh hadoop@master
ssh-copy-id hadoop@slave1
yes 并且 输入当前hadoop密码
ssh hadoop@slave1
最后,三台主机能够相互免密登录