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