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updated README to include OpenSSH comments (#161)

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Alister MacCormack 2022-07-29 08:58:30 -04:00 committed by GitHub
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@ -163,6 +163,26 @@ See the detail information about [SSH login without password](http://www.linuxpr
* Change the permissions of `.ssh` to 700
* Change the permissions of `.ssh/authorized_keys2` to 640
### If you are using OpenSSH
If you are currently using OpenSSH and are getting the following error:
```bash
ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey]
```
Make sure that your key algorithm of choice is supported.
On Ubuntu 20.04 or later you must explicitly allow the use of the ssh-rsa algorithm. Add the following line to your OpenSSH daemon file (which is either `/etc/ssh/sshd_config` or a drop-in file under
`/etc/ssh/sshd_config.d/`):
```
CASignatureAlgorithms +ssh-rsa
```
Alternatively, `ed25519` keys are accepted by default in OpenSSH. You could use this instead of rsa if needed:
```bash
ssh-keygen -t ed25519 -a 200 -C "your_email@example.com"
```
### Example
#### Executing remote ssh commands using password