Mar 22, 2019  How to upload an SSH key via the DreamCompute dashboard; Connect to your DreamCompute Instance with SSH keys in Mac or Linux; How to configure passwordless login in Mac OS X and Linux; Creating and importing a Key pair using the OpenStack CLI; Creating a new Key pair in Windows. To connect using SSH keys you need to copy the key from your machine to the remote server using ssh-copy-id user@remoteipaddress. You will be asked to enter the password for the remote server and the key will be copied. If you generated a key pair using a password then you will always have to enter that password when connecting.

Do not upgrade to macOS Sierra if you have a cloud server (AWS, Digital Ocean, etc.) Read this post first. It will walk you through safely updating to Sierra and updating your SSH keys.

Like many developers, I got a notice from Apple bugging me to install its new macOS Sierra. I clicked “remind me tomorrow” a few days in a row. Then I finally caved one night before going to bed.

When I woke up, I was no longer able to access Free Code Camp’s servers. It took me a while to realize what had happened. Luckily BerkeleyTrue hadn’t upgraded yet, and was able to add my new SSH keys.

It turns out Apple decided to quietly force 2048-bit RSA keys on everyone, which has been a mild inconvenience for some, and a confused panic for others.

If you’re wondering why RSA keys are more secure than the old DSA keys, they aren’t inherently so. But DSA keys can usually only be 1024 bits, while RSA keys can be longer, which is the case with Sierra’s default 2048-bit RSA keys. Those extra bits make these new keys substantially harder to crack.

Let’s set up your new 2048-bit RSA SSH key.

Step #1: delete your old key and create a new one

First, let’s check and make sure you indeed need a new key.

Open up your terminal and type:

/command-that-generates-a-gpg-public-private-key-pair.html. You re gonna go far kid download. If the prompt responds with a string that starts with “2048 SHA256” you’re done and don’t need to take any further action.

Otherwise, create a new key by running:

The prompt should respond with: /microsoft-office-professional-2013-activation-key-generator.html.

You can just press enter to save it in the default place. Note that this will overwrite your old (broken) key.

You can leave this blank or add a password for a little extra security (and a lot more typing).

Then you’ll get with a cool random “art” that always seems to be shaped like a Christmas tree:

Now make sure your key has the right access permissions by running:

You can check the contents of your public key by running:

Mac Ssh Public Key

Which should return something like:

Mac Os High Sierra Generate Ssh Key Github

You’ll need to put this key on your server. To ensure you copy all of it, I recommend you can copy it directly to your clipboard by running:

Step #2: add your new public key to your server

If you can SSH into your server without your key, then try to gain access using a password if you have one.

Otherwise you’ll need to ask someone else who has access to the server to do this for you.

Generate Ssh Key Mac Os

If you’ve disabled password access to your server (which many experts would recommend for security reasons), you may be able to temporarily re-enable password access.

Once you have root access to your server — assuming it’s a Linux server — you just need to run this command:

This will open up your authorized key file using the minimalist text editor “nano” that is included with most Linux distributions. Or you could use Vim.

Then paste in your public SSH key from earlier. Hit control+o to save your changes, then control+x to quit nano.

Disconnect from your server. Now you’re ready to try logging in using your new SSH key.

Step #3: SSH into your server

Mac Os High Sierra Generate Ssh Key For Git

Run this command to SSH in, replacing root@0.0.0.0 with your server’s login and IP address:

You should gain normal SSH access to your to your server, without needing to enter a password.

Mac Os Mojave

Congratulations! You’re back where you were yesterday, except now Apple will quit bugging you about upgrading your operating system. ?

I only write about programming and technology. If you follow me on Twitter I won’t waste your time. ?