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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-10333) Secure VM Live migration for KVM
Date Thu, 19 Apr 2018 19:25:00 GMT


ASF subversion and git services commented on CLOUDSTACK-10333:

Commit 8da2462469db9656e9749ed5607635ce53e8581e in cloudstack's branch refs/heads/master from
[;h=8da2462 ]

CLOUDSTACK-10333: Secure Live VM Migration for KVM (#2505)

This extends securing of KVM hosts to securing of libvirt on KVM
host as well for TLS enabled live VM migration. To simplify implementation
securing of host implies that both host and libvirtd processes are
secured with management server's CA plugin issued certificates.

Based on whether keystore and certificates files are available at
/etc/cloudstack/agent, the KVM agent determines whether to use TLS or
TCP based uris for live VM migration. It is also enforced that a secured
host will allow live VM migration to/from other secured host, and an
unsecured hosts will allow live VM migration to/from other unsecured
host only.

Post upgrade the KVM agent on startup will expose its security state
(secured detail is sent as true or false) to the managements server that
gets saved in host_details for the host. This host detail can be accesed
via the listHosts response, and in the UI unsecured KVM hosts will show
up with the host state of ‘unsecured’. Further, a button has been added
that allows admins to provision/renew certificates to KVM hosts and can
be used to secure any unsecured KVM host.

The `cloudstack-setup-agent` was modified to accept a new flag `-s`
which will reconfigure libvirtd with following settings:

    key_file = "/etc/pki/libvirt/private/serverkey.pem"
    cert_file = "/etc/pki/libvirt/servercert.pem"
    ca_file = "/etc/pki/CA/cacert.pem"

For a connected KVM host agent, when the certificate are
renewed/provisioned a background task is scheduled that waits until all
of the agent tasks finish after which libvirt process is restarted and
finally the agent is restarted via AgentShell.

There are no API or DB changes.

Signed-off-by: Rohit Yadav <>

> Secure VM Live migration for KVM
> --------------------------------
>                 Key: CLOUDSTACK-10333
>                 URL:
>             Project: CloudStack
>          Issue Type: Improvement
>      Security Level: Public(Anyone can view this level - this is the default.) 
>            Reporter: Rohit Yadav
>            Assignee: Rohit Yadav
>            Priority: Major
>             Fix For:,
> With use of CA framework to secure hosts, the current mechanisms don't secure libvirtd
to use those certificates (used by agent to connect to mgmt server). This causes insecure
vm migration over tcp instead of tls. The aim is to use the same framework and certificates
to secure live VM migration. This could be coupled with securing of a host and renewal/provisioning
of certificates to host.
> FS:

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