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VOOZH | about |
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VOOZH | about |
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This curriculum introduces open-source cloud computing to a general audience along with the skills necessary to deploy applications and websites securely to the cloud.
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Former Senior Technical Writer at DigitalOcean, specializing in DevOps topics across multiple Linux distributions, including Ubuntu 18.04, 20.04, 22.04, as well as Debian 10 and 11.
With over 6 years of experience in tech publishing, Mani has edited and published more than 75 books covering a wide range of data science topics. Known for his strong attention to detail and technical knowledge, Mani specializes in creating clear, concise, and easy-to-understand content tailored for developers.
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Nice tut…really helpful
Very good one!!
The article says:
You can also use wildcards to match more than one host. Keep in mind that later matches can override earlier ones. Because of this, you should put your most general matches at the top.
But from the ssh_config(5) man page:
For each parameter, the first obtained value will be used. … Since the first obtained value for each parameter is used, more host-specific declarations should be given near the beginning of the file, and general defaults at the end.
So it should be the opposite :-)
Nice article…
I always forget how to use the tools provided to put my SSH key on the intended server, so I just end up manually creating the file using vim and then pasting it into the editor.
When this happen, I always forget to set the correct permissions on the ~/.ssh/ directory and the ~/.ssh/authorized_keys file on the server.
~/.ssh/ should be 700 (dwrx------) and ~/.ssh/authorized_keys should be 600 (-wr-------)
Your sshd service may refuse to use the SSH keys if their permissions are not set correctly, which forces you to set them so that your authentication is secure.
Also, and I may be wrong about this, but if you are using OS X, and your SSH private key file has the wrong permissions or is not placed inside an appropriately permissioned directory, OS X may refuse to use your private key. (I remember having this as having happened to me in the past, but I just tried to dupicate it on OS X Yosemite and it never failed on me)
One more point to make regarding permissions is user:group association. If you are making a SSH pub/priv key pair for another user, and you are doing so using root (or anything other than that users id), then you could have problems with SSH being able to use those keys for authentication. Just do a chown user:group ssh_private_key_file to set those correctly (for example: chown beau:beau ~/.ssh/id_rsa ).
Of course if you use ssh-keygen to create the SSH pub/priv key pairs and ssh-copy-id to transfer it to your server, those permissions are already set.
If you are on OS X, which doesn’t include ssh-copy-id, you should look into getting the Homebrew package manager, and use that to get a copy of ssh-copy-id.
Thanks, clear and very useful information.
wonderful article. Thanks.
An omission in this article cost me many hours. Mac users need an extra command in order to use ssh keys after generating them to a file other than the default. Mac OS X users, you need ssh-add -K <private key file name> More information found here : mac instructions
Very well written article. Very informative.
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