a distributed VM management tool

minimega 2.5 release notes


The minimega team is pleased to announce the release of minimega 2.5. This release includes various improvements and numerous bug fixes. This release contains changes to the existing API which will improve user experience and programmability.

What's new

Major changes and milestones

cc synchronization

miniccc and the cc server now synchronize with magic bytes ("RON") before their handshake so that extra data from a previous connection can be flushed from their buffers. This allows VMs to be shutdown/`vm`start`'d and reconnect to the cc server. Because of the way minimega connects to the client, we only attempt to reconnect after a vm start. If the VM restarts (i.e. with the in-guest restart mechanism), we currently do not detect this to attempt a reconnect.

This changes requires users to update the miniccc binaries in their VMs.

PR #1177.

cc mount API

Extended miniccc to expose the guest filesystem to the host over the miniccc connection. This allows the filesystem to be mounted on the host or across the network on the head node.

The command and control article has been updated to show its use.

PR #1108.

ns snapshot API

Added ns snapshot which calls vm migrate on all VMs in the namespace and writes a launch script to recreate those VMs from the migration files.

This capability has very limited testing.

PR #1081.

read API

The read API now records the namespace that is active at the beginning of the read command and prepends it to all commands. To allow read scripts to change the namespace, the read API inspects commands and updates the namespace accordingly. This prevents issues where multiple read scripts run simultaneously in different namespaces.

The read API also reports the line number when there is a parse error.

PRs #977 and #1116.

-namespace flag

Added -namespace flag to specify a namespace to use when running commands for the -attach and -e flags.

PR #970.

Additional new features

tap mirror API

Added tap mirror API to create a mirror of a tap. This allows another VM to inspect the traffic from an experiment. See the article for an example.

PR #1118.

log ring API

Added log ring API which tracks the most recent log messages in an in-memory ring buffer. The log ring can be created with an arbitrary size and can be dumped by calling log ring with no arguments.

PR #1121.

Improved QEMU integration

Added vm config cores and vm config machine APIs allowing users to specify the number of cores and the machine type. The acceptable machine types, CPUs, and network drivers are based on what the binary vm config qemu reports.

PR #1070.

tar: prefix

Added support for tar: prefix which fetches and untars tarballs via meshage. Currently only untars if there is a single top-level directory. It untars to the same directory that contains the tarball.

PR #1130.

file delete <GLOB>

Added glob support to file delete.

PR #972.

vnc API

Added support for running commands against multiple VMs in the same VNC command with an API similar to vm start.

PR #1158.

cc filter API

Added support for all vm info fields for cc filter such as:

cc filter name=server
cc filter vlan=DMZ

PR #1161.


Trim -balloon flag from the default QEMU args.

PR #1165.


Upgraded noVNC to v1.0.0.

PR #1110.

Documentation updates

Added several new articles:

Removed Vyatta article (deprecated API removed in v2.4).

Auxiliary Tools


Added support for namespaces to miniweb is several ways. First, users may now force a namespace by starting miniweb with the -namespace flag. Second, when miniweb is not forced into a namespace, users may specify namespaces in the URL. For example, http://localhost:9001/foo/vms will only show VMs in the "foo" namespace.

Added montage page to show VM screenshots with minimal wrappings.

PRs #876, #987, and #1157.


Replaced fdisk with sfdisk to fix issues with newer versions of fdisk.

PR #1164.


Improved show command.

PRs #1159 and #1160.

Added sync command.

PR #1169.


Added support for user-agent strings in HTTP requests and fix a reporting error with DNS hits/second.

PR #1172.

Bug fixes

vnc API with namespaces

vnc API no longer reports `vm not found errors` when there are multiple hosts in the namespace and only one is running the target VM.

PR #1125.

disk API

Fixed the disk API so that it returns an error when the partition is not specified and the disk has more than one partition.

PR #1127.

vm config coschedule API

Allow localhost as value to vm config coschedule.

PR #1134.

vm tag API

Fix bug in vm tag where tags for all VMs were being shown instead of just those for the specified target.

PR #1156.

capture API

Fix bug in capture where some arguments caused an unreachable error.

PR #1167.

vmbetter images

Added Bro #1163.

Added minimal Ubuntu #1179.


minimega is available in several ways, both as pre-built distributions and source. See the installing guide for more information.

Debian package

minimega is available as an x86-64 debian package, available here. It is known to work in debian 7 (wheezy) and 8 (testing/jessie) and ubuntu 16.04.


A pre-built, x86-64 distribution is available in a single distributable tarball here. It should be sufficient to simply unpack the tarball and run tools from the bin/ directory directly. Most default paths in minimega, vmbetter, and other tools are built to be used in this way (i.e. bin/minimega, which will then look for the web directory in misc/web).

Building from source

Source of the entire distribution is available on Github. Follow the directions for cloning or forking minimega on In order to build minimega, you will need a Go 1.8+ compiler and libpcap headers.