[libvirt-users] How can I open a libvirt remote connection with ssh

[Daniel P. Berrange]

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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