Configure remote Linux Server SSH key authentication for automatic logon in Mac OS X

Configure remote Linux Server SSH key authentication for automatic logon in Mac OS X
1. Create a public key on the local machine

Open the omnipotent terminal, execute the following command, ignore all output, and press ENTER happily.

ssh-keygen -t rsa -C  'your email@domain.com'

-T specifies the key type. The default value is rsa, which can be omitted.
-C: Set the comment text, such as your mailbox.

2. Copy the public key to the ssh server

Convert the Public Key generated in the previous step ~ /Id_rsa.pub file, which is copied to ~ The/. ssh/authorized_keys file can be used in multiple ways. Here, we only introduce three common methods.

• [For osx systems] use the ssh-copy-id-for-OSX tool to copy the public key to the ssh server

Brew install ssh-copy-idssh-copy-id username @ hostname # Replace username and hostname with your ssh Server user name and IP address

• This method is used when there is no. ssh directory in the username user directory of the ssh server.

cat ~/.ssh/id_rsa.pub | ssh username@hostname "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys"

• Common Mode

scp ~ / .ssh / id_rsa.pub username @ hostname: ~ / #Copy the public key file to the ssh server
ssh username @ hostname #Log in to the ssh server using username and password
mkdir .ssh #If the .ssh directory already exists, you can omit this step
cat id_rsa.pub >> .ssh / authorized_keys #Append the contents of the public key file id_rsa.pub file to the authorized_keys file

3. Quick Logon

After completing the above steps, you can use the following command to log on to the ssh server directly. Mom no longer needs to worry about your password.

Ssh username @ hostname # Replace username with your ssh Server user name, and hostname with the server ip Address

However, each time you still need to enter ssh username @ hostname, it is still not the best solution. If you can achieve one-click Login or one command login, it is best to see the solutions below.

• Ssh also provides a quick way to solve this problem ~ Add your ssh server information to the/. ssh/config configuration file.

Vim ~ /. Ssh/config # If the file does not exist, create a new one.

The file content format is as follows:

Host alias #Custom alias
     HostName hostname #Replace with your ssh server IP or domain
     Port port #ssh server port, default is 22
     User user #ssh server username
     IdentityFile ~ / .ssh / id_rsa #The private key file corresponding to the public key file generated in the first step

After saving the file and exiting, you can use the alias to log on to the ssh server.

Ssh alias # alias is where you are ~ The alias configured in the/. ssh/config file

If multiple ssh accounts need to be configured ~ /. Ssh/config empty lines and write again, as shown below:

Host        foo
    HostName        192.168.2.222
    Port            22
    User            test
    IdentityFile    ~/.ssh/id_rsa

Host        alias
    HostName    hostname
    Port        port
    User        user

• If zsh is used on your local terminal, it is too simple to add an alias to zsh directly.

echo "alias ssh-to-username = 'ssh username @ hostname'" >> ~ / .zshrc #Replace username and hostname with your server information
source ~ / .zshrc #Reload the changed zshrc file
ssh-to-username #Using aliases, one command can log in to your ssh server 

• If your local terminal uses iterm2, you can also add a Profile for one-click logon. The steps are skipped here.

You may also like the following SSH-related articles. For details, refer:

Complete SSH service configuration and troubleshooting in Ubuntu

How to install Samba and SSH server in Ubuntu 14.04

SSH service remote access to Linux Server login is slow

How to Improve the SSH login authentication speed of Ubuntu

Enable the SSH service to allow Android phones to remotely access Ubuntu 14.04

How to add dual authentication for SSH in Linux

Configure the SFTP environment for non-SSH users in Linux

Configure and manage the SSH service on Linux

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