adding a host to known_hosts non-interactively

murmur101 · 03-09-2011, 05:20 AM

Hi,

I have an automated setup (debian) which includes a startup script that rsyncs to a server (always the same server). Everything works well - just that I have to manually confirm that the host is supposed to be added to the known_hosts

Code:

The authenticity of host 'myserver.com (xx.xx.xx.xx)' can't be established.
RSA key fingerprint is 9b:ee:a6:47:hb:92:ac:76:81:94:18:7d:ad:8c:3e:25.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'myserver.com,xx.xx.xx.xx' (RSA) to the list of known hosts.

It is pretty bothersome having to log in to my box just to accept the connection - having the host added automatically (preseed, script) would be nice.

Tried the bold approach editing the ~/.ssh/known-hosts file but without luck as entry seems to be differen for every host. (probably signed)

I would have to fall to "expect" but this is a pretty nasty way to do it. There might be better ways to do it.

Thank you for you creative input...

centosboy · 03-09-2011, 05:51 AM

Quote:

Originally Posted by murmur101

Hi,

I have an automated setup (debian) which includes a startup script that rsyncs to a server (always the same server). Everything works well - just that I have to manually confirm that the host is supposed to be added to the known_hosts

Code:

The authenticity of host 'myserver.com (xx.xx.xx.xx)' can't be established.
RSA key fingerprint is 9b:ee:a6:47:hb:92:ac:76:81:94:18:7d:ad:8c:3e:25.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'myserver.com,xx.xx.xx.xx' (RSA) to the list of known hosts.

It is pretty bothersome having to log in to my box just to accept the connection - having the host added automatically (preseed, script) would be nice.

Tried the bold approach editing the ~/.ssh/known-hosts file but without luck as entry seems to be differen for every host. (probably signed)

I would have to fall to "expect" but this is a pretty nasty way to do it. There might be better ways to do it.

Thank you for you creative input...

Yes there are...
This is a couple of them

Code:

ssh -o StrictHostKeyChecking=no myserver.com

or

turn off stricthostkeychecking in the global ssh_config file or the local ssh config file. (~/.ssh/config)

MCD555 · 03-09-2011, 05:56 AM

Quote:

Originally Posted by murmur101

Hi,

I have an automated setup (debian) which includes a startup script that rsyncs to a server (always the same server). Everything works well - just that I have to manually confirm that the host is supposed to be added to the known_hosts

Code:

The authenticity of host 'myserver.com (xx.xx.xx.xx)' can't be established.
RSA key fingerprint is 9b:ee:a6:47:hb:92:ac:76:81:94:18:7d:ad:8c:3e:25.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'myserver.com,xx.xx.xx.xx' (RSA) to the list of known hosts.

It is pretty bothersome having to log in to my box just to accept the connection - having the host added automatically (preseed, script) would be nice.

Tried the bold approach editing the ~/.ssh/known-hosts file but without luck as entry seems to be differen for every host. (probably signed)

I would have to fall to "expect" but this is a pretty nasty way to do it. There might be better ways to do it.

Thank you for you creative input...

You can get the serer public key (and import it) just using the:

Code:

ssh-keyscan -t rsa,dsa >> ~/.ssh/known-hosts

command when you set up the "new" connection(s).