Linux configuration without password login stand-alone and full distribution detailed tutorial

1: Single machine password-free login configuration

1. Set the virtual machine host name

hostnamectl --static set-hostname hadoop001

The --static parameter means that hadoop001 is the host name of the virtual machine permanently.

2. Configure the mapping relationship between host name and IP address in the virtual machine

vi /etc/hosts

Add at the end of the file (the IP address can be viewed using the command ip addr)

192.168.17.131 hadoop001 

3. Turn off the firewall

systemctl stop firewalld.service
systemctl disable firewalld.service

4. Execute the following command:

 ssh-keygen -t rsa (After executing the command, just press the Enter key three times)
 cd ~/.ssh/
 ssh-copy-id -i id_rsa.pub root@hadoop001 

success! ! !

2: Fully distributed password-free login configuration

1. Set the host name of each virtual machine

hostnamectl --static set-hostname hadoop001 (master node)
hostnamectl --static set-hostname hadoop002 (from node 1)
hostnamectl --static set-hostname hadoop003 (from node 2)

The --static parameter means that hadoop001 is the host name of the virtual machine permanently.

2. Configure the mapping relationship between the host name and the IP address in the virtual machine (this operation must be performed on each machine)

vi /etc/hosts

Add at the end of the file (the IP address can be viewed using the command ip addr)

192.168.17.131 hadoop001
192.168.17.132 hadoop002
192.168.17.133 hadoop004 

3. Turn off the firewall (this needs to be done on every machine)

systemctl stop firewalld.service
systemctl disable firewalld.service

4. Execute the following command:

ssh-keygen -t rsa (After executing the command, just press the Enter key three times)
cd ~/.ssh/
ssh-copy-id -i id_rsa.pub root@hadoop001
ssh-copy-id -i id_rsa.pub root@hadoop002
ssh-copy-id -i id_rsa.pub root@hadoop003 

success! ! !

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