libvirt users - Apr 2013 - How can I open a libvirt remote connection with ssh

Hi,

When I use 'virConnectOpenAuth' function to connect to
'192.168.1.102' libvirtd with ssh,
Code below,  the screen print the dialog "root at 192.168.1.102's
password:" ,  and only
After I type the password, the connection can be created.

How can I connect to libvirtd with ssh automatically? No need to type the
password manually.

char *au[2] = {"root", "xxxx"};
virConnectAuth auth = {
                credTypes,
                sizeof(credTypes) / sizeof(int),
                virConnCb,/* callback function, actually was not be called after
connect*/
                au /* user and password */
            };
conn = virConnectOpenAuth("qemu+ssh://192.168.1.102/system",
&auth, 0);


Thanks,
Kevin
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On Thu, Apr 11, 2013 at 09:45:18AM +0000, Wangkai (Kevin,C)
wrote:
> Hi,
> 
> When I use 'virConnectOpenAuth' function to connect to
'192.168.1.102' libvirtd with ssh,
> Code below,  the screen print the dialog "root at 192.168.1.102's
password:" ,  and only
> After I type the password, the connection can be created.
Libvirt has to spawn an external SSH process for +ssh URIs, so we can't hook
it up into our auth callbacks.
> How can I connect to libvirtd with ssh automatically? No need to type the
password manually.
You need to setup SSH public keys + SSH agent
> 
> char *au[2] = {"root", "xxxx"};
> virConnectAuth auth = {
>                 credTypes,
>                 sizeof(credTypes) / sizeof(int),
>                 virConnCb,/* callback function, actually was not be called
after connect*/
>                 au /* user and password */
>             };
> conn = virConnectOpenAuth("qemu+ssh://192.168.1.102/system",
&auth, 0);
virConnectOpenAuth() doesn't do anything useful for '+ssh' URIs.

There is however a alternative  'libssh2' URI that does use the
callbacks. eg   qemu+libssh2://hostname/system

This is less tested & potentially buggy, but it might be ok for your needs

Regards,
Daniel
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On Thu, Apr 11, 2013 at 09:45:18AM +0000, Wangkai (Kevin,C)
wrote:
> 
> How can I connect to libvirtd with ssh automatically? No need to type the
password manually.
Just use SSH public key authentication with an empty passphrase, just
as you would with any other automated SSH connection.