2:25 a.m.
Usual prologue: we're testing on CentOS 5.5, RHEL subscriptions purchased.
Now trying to use virt-v2v to transfer Win2008 Server guest from ESXi host to KVM host.
Have enabled SSH on ESXi host, and can connect using esx+ssh://esxhost, but procedure
fails because nc isn't found on ESXi. Fair enough. BTW, ESXi looks like a radically
cut down RH system (/etc/sysconfig being the give-away)?
So, using esx:// connection method which presumably uses TLS ...
Connection commands I'm trying to use:
virt-v2v -f virt-v2v.conf -ic esx://esxhost/?no_verify=1 -op vm_nfs 'HPTRIM
Sandbox'
virt-v2v -f virt-v2v.conf -ic esx://esxhost/ -op vm_nfs 'HPTRIM Sandbox'
I have eliminated libvirt error messages (all #38) relating to /etc/pki/CA/cacert.pem and
/etc/pki/libvirt/private/clientkey.pem by creating those files on KVM host according to
info on this page:
http://libvirt.org/remote.html#Remote_libvirtd_configuration
Now I am down to a simple connection refused error message:
virt-v2v: Failed to connect to esx://esxhost/: libvirt error code: 38, message: unable to
connect to 'esxhost': Connection refused
I have also tried suggestion on webpage above regarding these libvirtd.conf settings and
restarted libvirtd:
tls_no_verify_certificate = 1
key_file = ""
cert_file = ""
ca_file = ""
crl_file = ""
... But no change.
The problem may well be the TLS certificates, PKI isn't one of my strong points. I
believe the hostnames in the certificates are correct. Which certificates (if any) should
be copied to the ESXi host (client or server)?
Should I copy any certificates from /etc/vmware/ssl to the KVM host, if so which
certificate (rui.crt or rui.key) and where to?
There doesn't appear to be anything resembling an iptables firewall in place on the
ESXi host.
Anyway, any suggestions on what the problem could be greatly appreciated.
Michael Hall
IT Communications Officer
Alice Springs Town Council
2:53 a.m.
virt-v2v connect to the ESX through libvirt ESX driver, here is the link,
http://www.libvirt.org/drvesx.html
why not just try the simple way to see what's going on, you could set
virsh -c esx://esxhost/?no_verify=1
btw, hope the below mail can help something,
2010/7/3 adrian wyssen<wyssenadrian gmail com>:
Hello everyone
I am really new to libvirt and I have to use it with ESXi. I was writing
code for listing the virtual machines in a ESXi server. If I connect me with
the virsh to the ESXi server, it works. But since I can not create any
certificates on the server (ESXi does not have any console...) I have to use
the no_verify option (esx://host/?no_verify=1)
I want to do the same with the API, but when I use this string in the uri
parameter of the following code
conn = virConnectOpenAuth(uri, virConnectAuthPtrDefault, 0);
the system returns "libvir: Remote error : Cannot access CA certificate
'/etc/pki/CA/cacert.pem': No such file or directory
No connection to hypervisor"
What method can I use to be able to connect to the server by ignoring the
missing certificate? Another question is: Are there any example codes for
using ESX(i), because as I said I am really new with libvirt and I did not
find any examples.
Thanks a lot for your help.
Adrian
The certificates libvirt is complaining about have nothing to do with
the certificates for ESX(i).
By default libvirt uses a TLS connection to a remote libvirtd (a
daemon). This daemon is used to allow remote management of hypervisors
that don't have remote capabilities on their own, like QEMU. For
ESX(i) this daemon is not necessary, because libvirt directly uses the
remote SOAP API provided by the ESX(i) server.
By default libvirt uses a HTTPS connection to the ESX(i) server.
Proper HTTPS requires correctly configured SSL certificates, this
certificates are different from the certificates for libvirt's TLS
connection to libvirtd. In case of a default ESX(i) installation the
ESX(i) server has auto-generated self-signed certificates. And in
general those cannot be verified by your client because your client
doesn't have the cacert.pem that corresponds to the private key that
the ESX(i) server used to sign the auto-generated self-signed
certificates.
That's the reason why libvirt allows you to disable those certificate
check by appending ?no_verify=1 to the URI.
libvirt complains here about the for the TLS connection to a remote
libvirtd. This is a bit cryptic error that appears because libvirt
don't know what to do with the URI you gave to it and as last option
it tries to connect to a libvirtd on the remote server hoping that the
libvirtd there knows what to do with the URI.
The typical reason why this happens is that your libvirt is build
without ESX support. But you said 'virsh -c esx://host/?no_verify=1'.
Therefore, I assume that's not the case here.
Could it be that you have multiple version of libvirt installed? One
that has ESX support enabled and is used by virsh and one that has ESX
support disabled and that your program links against?
Regarding example code: There is no special ESX libvirt example code,
because libvirt is designed to provide hypervisor independent API.
You can take a look at the examples directory. For example the
hellolibvirt example:
./examples/hellolibvirt/hellolibvirt esx://host/?no_verify=1
If that still gives you that certificate error, try:
LIBVIRT_DEBUG=1 LIBVIRT_LOG_OUTPUTS=1:stderr
./examples/hellolibvirt/hellolibvirt esx://host/?no_verify=1
It should list lines like
13:13:23.189: debug : virRegisterDriver:927 : registering ESX as driver 5
...
13:13:23.189: debug : do_open:1242 : trying driver 5 (ESX) ...
If there is no virRegisterDriver or do_open line regarding ESX then
your libvirt is build without ESX support. But i wonder why virsh
works then.
Recent (unreleased) libvirt has better error reporting for this
situation and tells you when you try to use an URI scheme that was
disabled, instead of reporting unexpected certificate errors.
Matthias
On 10/21/2010 03:25 PM, Mike Hall wrote:
Usual prologue: we're testing on CentOS 5.5, RHEL subscriptions
purchased.
Now trying to use virt-v2v to transfer Win2008 Server guest from ESXi host to KVM host.
Have enabled SSH on ESXi host, and can connect using esx+ssh://esxhost, but procedure
fails because nc isn't found on ESXi. Fair enough. BTW, ESXi looks like a radically
cut down RH system (/etc/sysconfig being the give-away)?
So, using esx:// connection method which presumably uses TLS ...
Connection commands I'm trying to use:
virt-v2v -f virt-v2v.conf -ic esx://esxhost/?no_verify=1 -op vm_nfs 'HPTRIM
Sandbox'
virt-v2v -f virt-v2v.conf -ic esx://esxhost/ -op vm_nfs 'HPTRIM Sandbox'
I have eliminated libvirt error messages (all #38) relating to /etc/pki/CA/cacert.pem and
/etc/pki/libvirt/private/clientkey.pem by creating those files on KVM host according to
info on this page:
http://libvirt.org/remote.html#Remote_libvirtd_configuration
Now I am down to a simple connection refused error message:
virt-v2v: Failed to connect to esx://esxhost/: libvirt error code: 38, message: unable to
connect to 'esxhost': Connection refused
I have also tried suggestion on webpage above regarding these libvirtd.conf settings and
restarted libvirtd:
tls_no_verify_certificate = 1
key_file = ""
cert_file = ""
ca_file = ""
crl_file = ""
... But no change.
The problem may well be the TLS certificates, PKI isn't one of my strong points. I
believe the hostnames in the certificates are correct. Which certificates (if any) should
be copied to the ESXi host (client or server)?
Should I copy any certificates from /etc/vmware/ssl to the KVM host, if so which
certificate (rui.crt or rui.key) and where to?
There doesn't appear to be anything resembling an iptables firewall in place on the
ESXi host.
Anyway, any suggestions on what the problem could be greatly appreciated.
Michael Hall
IT Communications Officer
Alice Springs Town Council
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Mohua Li
+86 10 6260 8263 (Direct),IRC,moli
9/F, North Tower C, Raycom Infotech Park ,NO.2 KeXueYuanNanLu, HaiDian District Beijing,
100190
1:17 p.m.
2010/10/21 Mike Hall <MHall(a)astc.nt.gov.au>:
Usual prologue: we're testing on CentOS 5.5, RHEL subscriptions
purchased.
Now trying to use virt-v2v to transfer Win2008 Server guest from ESXi host to KVM host.
Have enabled SSH on ESXi host, and can connect using esx+ssh://esxhost, but procedure
fails because nc isn't found on ESXi. Fair enough. BTW, ESXi looks like a radically
cut down RH system (/etc/sysconfig being the give-away)?
libvirt doesn't use ssh or any other transports described at [1] for
ESX. libvirt connects directly to the ESX server using HTTPS without
the need for a libvirtd on the ESX server or any libvirt provided
transport.
So, using esx:// connection method which presumably uses TLS ...
Well, it uses HTTPS, but it doesn't use the TLS transport as described at [1].
Connection commands I'm trying to use:
virt-v2v -f virt-v2v.conf -ic esx://esxhost/?no_verify=1 -op vm_nfs 'HPTRIM
Sandbox'
This one is probably the correct one, at least the libvirt connection
URI in it is correct.
virt-v2v -f virt-v2v.conf -ic esx://esxhost/ -op vm_nfs 'HPTRIM
Sandbox'
This one requires that your client computer can verify the HTTPS SSL
certificates installed on the ESX server, but this is unlikely unless
you manually replaced them by certificates that are signed by a known
CA. The no_verify=1 parameter in the first command tells libvirt to
ignore verification errors with this certificates so that it works
with the certificates that come with the ESX server by default.
Note that this HTTPS SSL certificates have nothing to do with the
certificates mention in [1].
I have eliminated libvirt error messages (all #38) relating to
/etc/pki/CA/cacert.pem and /etc/pki/libvirt/private/clientkey.pem by creating those files
on KVM host according to info on this page:
http://libvirt.org/remote.html#Remote_libvirtd_configuration
Configuring the KVM host with proper certificates is a good idea.
Now I am down to a simple connection refused error message:
virt-v2v: Failed to connect to esx://esxhost/: libvirt error code: 38, message: unable to
connect to 'esxhost': Connection refused
I have also tried suggestion on webpage above regarding these libvirtd.conf settings and
restarted libvirtd:
tls_no_verify_certificate = 1
key_file = ""
cert_file = ""
ca_file = ""
crl_file = ""
... But no change.
libvirt doesn't require a libvirtd on the ESX server.
The problem may well be the TLS certificates, PKI isn't one of my
strong points. I believe the hostnames in the certificates are correct. Which certificates
(if any) should be copied to the ESXi host (client or server)?
Should I copy any certificates from /etc/vmware/ssl to the KVM host, if so which
certificate (rui.crt or rui.key) and where to?
There doesn't appear to be anything resembling an iptables firewall in place on the
ESXi host.
Anyway, any suggestions on what the problem could be greatly appreciated.
The first line of your mail gives me the relevant hint. You use CentOS
5.5 and this one comes with libvirt 0.6.5 IIRC, but ESX support was
added to libvirt in 0.7.0. The error messages you get from libvirt are
misleading and have been improved in libvirt 0.8.3.
limohua and Osier already gave the right hints, so I'm basically just
summarize it here. :)
As Osier points out, even if your libvirt is recent enough in general
it might have been compiled without ESX support. In that case you'll
get the same misleading error messages about refused connections or
missing certificates (form libvirt 0.7.0 until 0.8.3).
In order to fix this problem you probably need to update your libvirt
version and make sure that it is compiled with ESX support.
As this seems to be a common problem I'm improving the documentation
about this right now.
[1] http://libvirt.org/remote.html
Matthias
5176
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5176
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2 comments
3 participants
participants (3)
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limohua -
Matthias Bolte -
Mike Hall