ssh keygen ssh add

ssh-keygen

ssh-keygen pairs:

1. Generate key pairs The algorithm is selected using the -t option and key size using the -b option. The following commands illustrate:

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   ssh-keygen -t rsa -b 4096 
   ssh-keygen -t dsa 
   ssh-keygen -t ecdsa -b 521 
   ssh-keygen -t ed25519
   ssh-keygen -t ed25519 -C "your_email@example.com"
   ssh-keygen -f ~/tatu-key-ecdsa -t ecdsa -b 521
   

2. Copy the pubkey to the server user@host: the username and address of the remote machine

   ssh raymond@192.168.1.50

For github, copy pubkey using pdcopy and paste to SSH keys settings using web.

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ssh-copy-id -i ~/.ssh/tatu-key-ecdsa.pub user@host

If ssh-copy-id not installed, takes your public key, and appends it to ~/.ssh/authorized_keys

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cat ~/.ssh/tatu-key-ecdsa.pub | ssh user@host "mkdir -p ~/.ssh && chmod 700 ~/.ssh && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys"

copy pub key

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pdcopy < ~/.ssh/tatu-key-ecdsa.pub

Once the public key has been configured on the server, the server will allow any connecting user that has the private key to log in.

1. Add private key to ssh agent

   Firstly, run ssh-agent:
   

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    eval `ssh-agent`
   

   Then, add private key:(You may need to change privatekey into a 400 access code)
   

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    ssh-add ~/.ssh/privatekey
   

   Finally, Test:

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    ssh -vT git@github.com
   

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