| QEMU Monitor Protocol |
| ===================== |
| |
| Introduction |
| ------------- |
| |
| The QEMU Monitor Protocol (QMP) allows applications to communicate with |
| QEMU's Monitor. |
| |
| QMP is JSON[1] based and has the following features: |
| |
| - Lightweight, text-based, easy to parse data format |
| - Asynchronous events support |
| - Stability |
| |
| For more information, please, refer to the following files: |
| |
| o qmp-spec.txt QEMU Monitor Protocol current specification |
| o qmp-events.txt List of available asynchronous events |
| |
| There are also two simple Python scripts available: |
| |
| o qmp-shell A shell |
| o vm-info Show some information about the Virtual Machine |
| |
| [1] http://www.json.org |
| |
| Usage |
| ----- |
| |
| To enable QMP, QEMU has to be started in "control mode". There are |
| two ways of doing this, the simplest one is using the the '-qmp' |
| command-line option. |
| |
| For example: |
| |
| $ qemu [...] -qmp tcp:localhost:4444,server |
| |
| Will start QEMU in control mode, waiting for a client TCP connection |
| on localhost port 4444. |
| |
| It is also possible to use the '-mon' command-line option to have |
| more complex combinations. Please, refer to the QEMU's manpage for |
| more information. |
| |
| Simple Testing |
| -------------- |
| |
| To manually test QMP one can connect with telnet and issue commands: |
| |
| $ telnet localhost 4444 |
| Trying 127.0.0.1... |
| Connected to localhost. |
| Escape character is '^]'. |
| {"QMP": {"version": {"qemu": "0.12.50", "package": ""}, "capabilities": []}} |
| { "execute": "qmp_capabilities" } |
| {"return": {}} |
| { "execute": "query-version" } |
| {"return": {"qemu": "0.12.50", "package": ""}} |
| |
| Contact |
| ------- |
| |
| http://www.linux-kvm.org/page/MonitorProtocol |
| Luiz Fernando N. Capitulino <lcapitulino@redhat.com> |
