QEMU Guest Agent — QEMU documentation

# QEMU Guest Agent

## Synopsis

qemu-ga [OPTIONS]

## Description

The QEMU Guest Agent is a daemon intended to be run within virtual machines. It allows the hypervisor host to perform various operations in the guest, such as:

- get information from the guest

- set the guest’s system time

- read/write a file

- sync and freeze the filesystems

- suspend the guest

- reconfigure guest local processors

- set user’s password

- …

qemu-ga will read a system configuration file on startup (located at `/etc/qemu``/qemu-ga.conf` by default), then parse remaining configuration options on the command line. For the same key, the last option wins, but the lists accumulate (see below for configuration file format).

## Options

-m, --method=METHOD

  Transport method: one of `unix-listen`, `virtio-serial`, or `isa-serial`, or `vsock-listen` (`virtio-serial` is the default).

-p, --path=PATH

  Device/socket path (the default for virtio-serial is `/dev/virtio-ports/org.qemu.guest_agent.0`, the default for isa-serial is `/dev/ttyS0`). Socket addresses for vsock-listen are written as `<cid>:<port>`.

-l, --logfile=PATH

  Set log file path (default is stderr).

-f, --pidfile=PATH

  Specify pid file (default is `/var/run/qemu-ga.pid`).

-F, --fsfreeze-hook=PATH

  Enable fsfreeze hook. Accepts an optional argument that specifies script to run on freeze/thaw. Script will be called with ‘freeze’/’thaw’ arguments accordingly (default is `/etc/qemu``/fsfreeze-hook`). If using -F with an argument, do not follow -F with a space (for example: `-F/var/run/fsfreezehook.sh`).

-t, --statedir=PATH

  Specify the directory to store state information (absolute paths only, default is `/var/run`).

-v, --verbose

  Log extra debugging information.

-V, --version

  Print version information and exit.

-d, --daemon

  Daemonize after startup (detach from terminal).

-b, --block-rpcs=LIST

  Comma-separated list of RPCs to disable (no spaces, use `--block-rpcs=help` to list available RPCs).

-a, --allow-rpcs=LIST

  Comma-separated list of RPCs to enable (no spaces, use `--allow-rpcs=help` to list available RPCs).

-D, --dump-conf

  Dump the configuration in a format compatible with `qemu-ga.conf` and exit.

-h, --help

  Display this help and exit.

## Files

The syntax of the `qemu-ga.conf` configuration file follows the Desktop Entry Specification, here is a quick summary: it consists of groups of key-value pairs, interspersed with comments.

    # qemu-ga configuration sample
    [general]
    daemonize = 0
    pidfile = /var/run/qemu-ga.pid
    verbose = 0
    method = virtio-serial
    path = /dev/virtio-ports/org.qemu.guest_agent.0
    statedir = /var/run

The list of keys follows the command line options:

Key | Key type
--- | ---
daemon | boolean
method | string
path | string
logfile | string
pidfile | string
fsfreeze-hook | string
statedir | string
verbose | boolean
block-rpcs | string list

## See also

qemu(1)