If there are any problems, the /var/log/secure log file on the remote server should provide some insight. SSH should now use the private and public key pair for authentication. ssh directory nor the authorized_keys file must allow group writable permissions for SSH key authentication to work successfully. ![]() In this case, the directory will need to first be created. cat ~/.ssh/id_rsa.pub | ssh "cat > ~/.ssh/authorized_keys & chmod 600 ~/.ssh/authorized_keys"Īn error message showing " No such file or directory" may appear if the destination. Here is an example of copying the public key to the remote server manually if necessary. The content of id_rsa.pub is simply appended to the ~/.ssh/authorized_keys file on the remote server. ssh-copy-id will usually complete the process. The ssh-copy-id command can be used to automatically copy the public key to the remote server. The public key is now ready to be copied to the remote server. There should now be two files in the ~/.ssh/ directory. If no passphrase is needed, simply leave the field blank. A passphrase will protect the private key could should it ever become compromised. You will be prompted for a passphrase which is optional. ![]() A larger key length can be defined with the -b size parameter if desired. The bit length will default to 2048 bits which is considered sufficient. If a DSA key pair is already present, then an RSA key pair can safely be created along side the existing DSA key pair. Note: This tutorial will describe creating an RSA key pair. If either of the below filename pairs are present, then an RSA or DSA key pair already exist and you can move onto the next step of copying the public key to the remote server. It should first be confirmed that an existing public and private key do not already exist. ![]() While not required, the SSH private key can be encrypted with a passphrase for added security. The SSH key pair establishes trust between the client and server, thereby removing the need for a password during authentication. SSH can handle authentication using a traditional username and password combination or by using a public and private key pair.
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