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I'm very new to Linux so please bare with me. I'm trying to setup a Cloud9 development environment on my CentOS virtual server using SSH but I can't figure it out.

The instructions I'm trying to follow from Cloud9 are here: https://docs.c9.io/run_your_own_workspace.html

I know my server has SSH setup since I can login through PuTTY using the server IP address, username, and password. But the Cloud9 instructions tell me I must save the supplied public SSH key on my server at "~/.ssh/authorized_keys", but I have no idea how to do this, I don't even know where the .ssh directory is.

Can somebody help me figure this out?

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closed as off topic by Aaron Copley, mdpc, Ward, Scott Pack, John Gardeniers Jan 25 '13 at 9:50

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Why is it off topic ? isn't it an administration task ? –  Pierre de LESPINAY Feb 10 at 12:47

2 Answers 2

SSH to your remote host and paste the following (this will make the directory if it doesn't exist):

mkdir -p ~/.ssh/

And then copy and paste your public key into ~/.ssh/authorized_keys. If you've already uploaded your key, use:

cat ~/my_key_name.pub >> ~/.ssh/authorized_keys

You're telling your server that your public key is an acceptable form of identification for your user.

Then to make sure no one else can read these keys:

chmod -R 700 ~/.ssh

chmod changes the permissions of files and folders. -R means "do this recursively" and 700 is the equivalent of "let only me read, write, and execute things in this folder."

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The ~ means the home directory of the current user (or the user you try to connect to), but watch out adding the authorized_keys file to a user permits the one with the private key to connect to your server (without any password).

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I figured the ~ out, but there's no .ssh directory there... –  zscregan Jan 24 '13 at 22:02
    
Directories that begin with a . are hidden. Use ls -la to list all directory contents, including hidden files. –  JasonAzze Jan 24 '13 at 22:06
    
and by default the directory is not created just create it if ls -la does not show it. –  Gopoi Jan 24 '13 at 22:10
2  
If your client (the machine you're going to ssh from) is Linux, type man ssh-copy-id and read the manual page for this tool. –  JasonAzze Jan 24 '13 at 22:10
    
The machine isn't Linux unfortunately, it's this Cloud9 web based development environment thing. All it gives me is this text and tells me to add it to my authorized_keys file. The text looks like: ssh-rsa aaaaaaa...... myemailaddress@myemailaddress.com –  zscregan Jan 24 '13 at 22:20

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