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| − | Your aim
| + | SSH without password |
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| − | You want to use Linux and OpenSSH to automize your tasks. Therefore you need an automatic login from host A / user a to Host B / user b. You don't want to enter any passwords, because you want to call ssh from a within a shell script.
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| − | How to do it
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| − | | |
| − | First log in on A as user a and generate a pair of authentication keys. Do not enter a passphrase:
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| − | | |
| − | {{{
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| − | a@A:~> ssh-keygen -t rsa
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| − | Generating public/private rsa key pair.
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| − | Enter file in which to save the key (/home/a/.ssh/id_rsa):
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| − | Created directory '/home/a/.ssh'.
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| − | Enter passphrase (empty for no passphrase):
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| − | Enter same passphrase again:
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| − | Your identification has been saved in /home/a/.ssh/id_rsa.
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| − | Your public key has been saved in /home/a/.ssh/id_rsa.pub.
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| − | The key fingerprint is:
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| − | 3e:4f:05:79:3a:9f:96:7c:3b:ad:e9:58:37:bc:37:e4 a@A
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| − | }}}
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| − | | |
| − | Now use ssh to create a directory ~/.ssh as user b on B. (The directory may already exist, which is fine):
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| − | {{{
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| − | a@A:~> ssh b@B mkdir -p .ssh
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| − | b@B's password:
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| − | }}}
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| − | Finally append a's new public key to b@B:.ssh/authorized_keys and enter b's password one last time:
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| − | | |
| − | {{{
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| − | a@A:~> cat .ssh/id_rsa.pub | ssh b@B 'cat >> .ssh/authorized_keys'
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| − | b@B's password:
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| − | }}}
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| − | | |
| − | From now on you can log into B as b from A as a without password:
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| | [[Category:log]] | | [[Category:log]] |
