Download file from ssh ubuntu

In a public key encryption system, the public key is used to encrypt data that can only be decrypted by the owner of the private key. In the case of SSH key-based authentication, the private key is held by the host on which the SSH client is located while the corresponding public key resides on the system on which the SSH server is running. It is important to protect the private key, since ownership of the key will allow anyone to log into the remote system.

As an added layer of protection, therefore, the private key may also be encrypted and protected by a password which must be entered each time a connection is established to the server. There are four steps to setting up key-based SSH authentication which can be summarized as follows:. The remainder of this chapter will outline these steps in greater detail for Linux, macOS and Windows-based client operating systems.

If the SSH server is not already installed and running on the system, it can be added using the following commands:. The first step in setting up SSH key-based authentication is to generate the key pairs on the client system. If the client system is running Linux or macOS, this is achieved using the ssh-keygen utility:. Press the Enter key to accept the default location for the key files.

This will place two files in the. Next, ssh-keygen will prompt for a passphrase with which to protect the private key. If a passphrase is provided, the private key will be encrypted on the local disk and the passphrase required in order to gain access to the remote system. For better security, use of a passphrase is recommended. Finally, the ssh-keygen tool will generate the following output indicating that the keys have been generated:.

The next step is to install the public key onto the remote server system. This can be achieved using the ssh-copy-id utility as follows:. Once the key is installed, test that the authentication works by attempting a remote login using the ssh client:.

If the private key is encrypted and protected with a passphrase, enter the phrase when prompted to complete the authentication and establish remote access to the Ubuntu system:. Repeat these steps for any other accounts on the server for which remote access is required.

As currently configured, access to the remote system can still be achieved using the less secure password authentication. From this point on, it will only be possible to remotely access the system using SSH key-based authentication. It is not uncommon for multiple private keys to reside on a client system, each providing access to a different server. There are a number of options for selecting a specific key when establishing a connection.

It is possible, for example, to specify the private key file to be used when launching the ssh client as follows:. Excellent answer. To avoid moving the pem around, you can use the ssh -i flag to specify the public key to use. PersianGulf 9, 7 7 gold badges 45 45 silver badges 73 73 bronze badges. John Zhang John Zhang 3 3 silver badges 3 3 bronze badges. This is the answer I was looking for, all of the instructions in the accepted answer are good practice HalosGhost 4, 10 10 gold badges 30 30 silver badges 40 40 bronze badges.

Please explain your ssh command and also provide a reference, if possible. BTW, the chmod was provided in an answer nine months ago. And use -r to copy directories. And note that the default user name is different for different images: For Amazon Linux, the default user name is ec2-user.

A good head smack reminder for me to use the correct user name. Get the above error and I needed to remember to use the ubuntu user on ubuntu instances. I fixed it by adding "sudo" to the command chmod pemfile.

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Featured on Meta. So, make sure to replace it with yours from now on. To remotely access the Ubuntu Server The default password is ubuntu. The first time you log into Ubuntu Server You should be logged into the Ubuntu Server In this article, I have shown you how to install Ubuntu Server I was born in Bangladesh. Ubuntu is an open-source operating system. Ubuntu is a great operating system for your IoT projects on the Raspberry Pi 4.

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