SSH password free login - two virtual machines establish password free channel two-way trust

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Establishment of secret free passage

Prepare two virtual machines , Use root user
A：192.168.225.130
B：192.168.225.134

Three steps ：
1、 Generating key pairs locally
2、 Upload the public key to the other machine
3、 verification ： Log in to the other machine remotely

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1、 Generating key pairs locally

Generate key pair , stay A Machine use root User generated key pair , The key pair is placed under the user's home directory
perform ssh-keygen -t rsa command , Keep pressing enter

2、 Upload the public key to B machine , requirement B Machine permission root The user login

Use ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected] command , hold A The public key of the machine is given to B machine
-i Specify the public key file

3、 Verify whether a password is required for login

Use ssh -p 22 [email protected] command , Directly in A Machine remote login B machine
-p Designated port
You can see that you don't need to enter a password , Remote login to B machine

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The above is the establishment of one-way trust ,A To B Secret free passage of , The following will establish B To A Secret free passage of

The operation steps are the same as above ,B Machine as a local machine ,A The machine acts as a remote machine

1、 Generating key pairs locally

ssh-keygen -t rsa

2、 Upload the public key to A machine , requirement A Machine permission root The user login

ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]

3、 Verify whether a password is required for login

ssh -p 22 [email protected]

thus , Two way trust establishment is complete ,A The machine can log in remotely B machine ,B The machine can also log in remotely A machine

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summary

Establishing a secret free channel is actually two steps ： Generating key pairs locally , Give the public key to the remote machine