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QMP Shell is an interface to communicate with QEMU instances via QEMU Machine Protocol.

There are two ways to work with the QMP Shell:

1. Command line mode
2. Interactive mode

The first one is good for executing single commands, collecting statistics or fetching other data about the QEMU instances.

The interactive mode can be useful for debugging and experimenting.

Some examples:

1. Bring up the network card alice_ath0:

    echo set_link name=alice1 up=true | qmp-shell /var/run/kvm-monitor/alice.qmp
   

2. Set the password for VNC:

    echo set_password protocol=vnc password=secret | qmp-shell /var/run/kvm-monitor/alice.qmp
   

3. Get memory balloon information:

    echo query-balloon | qmp-shell /var/run/kvm-monitor/alice.qmp
    {
        "actual": 2.44318208e+08
    }
   

To work with the HMP commands use flag -H. Some examples:

1. Get memory balloon information:

    echo info balloon | qmp-shell -H /var/run/kvm-monitor/alice.qmp
    balloon: actual=233
   

2. Get the VNC server status:

    echo info vnc | qmp-shell -H /var/run/kvm-monitor/alice.qmp
   

3. All available commands with short description:

    echo help | qmp-shell -H /var/run/kvm-monitor/alice.qmp
   

mkdir qmp-shell && cd qmp-shell
export GOPATH=$(pwd); go get -v -tags netgo -ldflags '-s -w' github.com/0xef53/qmp-shell