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Machine-Nics

Status

Description

Setup complex network for use with virtual machines. Work under Freebsd and Linux.

Synopsis

machine-nics -f <yaml description file> -t <Linux|Freebsd> -a <create|destroy|up> [-n]

-n is for dry-run, nothing is created, and debug information is printed on screen.

Usage

gem install machine-nics

Create a bridge (bridge0) composed of aggregated interfaces (lagg0 with tap101 and tap102), tap interfaces with mtu of 1496 and a vlan with vid 101:

cat desc.yaml
:machine-1:
  :bridge0:
  - :tap201_1496
  - :tap202_1496
  - :lagg0:
    - :tap101_1496
    - :tap102_1496
  :vlan101: :tap101

First for Linux in dry-run mode (-n) :

% machine-nics -f desc.yaml -t Linux -a create -n
D, [12:23:34#6668] DEBUG -- :       => Create TAP102_1496 using:
D, [12:23:34#6668] DEBUG -- :         * sudo tunctl -t tap102
D, [12:23:34#6668] DEBUG -- :         * sudo ip l set dev tap102 mtu 1496
D, [12:23:34#6668] DEBUG -- :         * ip l set dev tap102 up
D, [12:23:34#6668] DEBUG -- :       => Create TAP101_1496 using:
D, [12:23:34#6668] DEBUG -- :         * sudo tunctl -t tap101
D, [12:23:34#6668] DEBUG -- :         * sudo ip l set dev tap101 mtu 1496
D, [12:23:34#6668] DEBUG -- :         * ip l set dev tap101 up
D, [12:23:34#6668] DEBUG -- :     => Create LAGG0 using:
D, [12:23:34#6668] DEBUG -- :       * sudo sh -c 'echo "+lagg0" > /sys/class/net/bonding_masters';
D, [12:23:34#6668] DEBUG -- :       * sudo sh -c 'echo "layer3+4"    > /sys/class/net/lagg0/bonding/xmit_hash_policy'
D, [12:23:34#6668] DEBUG -- :       * sudo sh -c 'echo balance-xor   > /sys/class/net/lagg0/bonding/mode'
D, [12:23:34#6668] DEBUG -- :       * sudo sh -c 'echo 100           > /sys/class/net/bond0/bonding/miimon'
D, [12:23:34#6668] DEBUG -- :       * sudo sh -c 'sudo ip l set dev lagg0 up'
D, [12:23:34#6668] DEBUG -- :       * 'echo +tap101        > /sys/class/net/lagg0/bonding/slaves'
D, [12:23:34#6668] DEBUG -- :       * 'echo +tap102        > /sys/class/net/lagg0/bonding/slaves'
D, [12:23:34#6668] DEBUG -- :       * ip l set dev lagg0 up
D, [12:23:34#6668] DEBUG -- :     => Create TAP202_1496 using:
D, [12:23:34#6668] DEBUG -- :       * sudo tunctl -t tap202
D, [12:23:34#6668] DEBUG -- :       * sudo ip l set dev tap202 mtu 1496
D, [12:23:34#6668] DEBUG -- :       * ip l set dev tap202 up
D, [12:23:34#6668] DEBUG -- :     => Create TAP201_1496 using:
D, [12:23:34#6668] DEBUG -- :       * sudo tunctl -t tap201
D, [12:23:34#6668] DEBUG -- :       * sudo ip l set dev tap201 mtu 1496
D, [12:23:34#6668] DEBUG -- :       * ip l set dev tap201 up
D, [12:23:34#6668] DEBUG -- :   => Create BRIDGE0 using:
D, [12:23:34#6668] DEBUG -- :     * "sudo brctl addbr bridge0 "
D, [12:23:34#6668] DEBUG -- :     * sudo brctl addif bridge0 tap201
D, [12:23:34#6668] DEBUG -- :     * sudo brctl addif bridge0 tap202
D, [12:23:34#6668] DEBUG -- :     * sudo brctl addif bridge0 lagg0
D, [12:23:34#6668] DEBUG -- :     * ip l set dev bridge0 up
D, [12:23:34#6668] DEBUG -- :     => Create TAP101 using:
D, [12:23:34#6668] DEBUG -- :       * sudo tunctl -t tap101
D, [12:23:34#6668] DEBUG -- :       * sudo ip l set dev tap101 mtu 1500
D, [12:23:34#6668] DEBUG -- :       * ip l set dev tap101 up
D, [12:23:34#6668] DEBUG -- :   => Create VLAN101 using:
D, [12:23:34#6668] DEBUG -- :     * sudo vconfig add tap101 101
D, [12:23:34#6668] DEBUG -- :     * ip l set dev vlan101 up

The same for Freebsd:

% machine-nics -f desc.yaml -t Freebsd -a create -n
D, [12:25:06#7415] DEBUG -- :       => Create TAP102_1496 using:
D, [12:25:06#7415] DEBUG -- :         * sudo ifconfig tap102 create mtu 1496
D, [12:25:06#7415] DEBUG -- :         * sudo ifconfig tap102 up
D, [12:25:06#7415] DEBUG -- :       => Create TAP101_1496 using:
D, [12:25:06#7415] DEBUG -- :         * sudo ifconfig tap101 create mtu 1496
D, [12:25:06#7415] DEBUG -- :         * sudo ifconfig tap101 up
D, [12:25:06#7415] DEBUG -- :     => Create LAGG0 using:
D, [12:25:06#7415] DEBUG -- :       * sudo ifconfig lagg0 create mtu 1500 laggproto loadbalance  laggport tap101  laggport tap102
D, [12:25:06#7415] DEBUG -- :       * sudo ifconfig lagg0 up
D, [12:25:06#7415] DEBUG -- :     => Create TAP202_1496 using:
D, [12:25:06#7415] DEBUG -- :       * sudo ifconfig tap202 create mtu 1496
D, [12:25:06#7415] DEBUG -- :       * sudo ifconfig tap202 up
D, [12:25:06#7415] DEBUG -- :     => Create TAP201_1496 using:
D, [12:25:06#7415] DEBUG -- :       * sudo ifconfig tap201 create mtu 1496
D, [12:25:06#7415] DEBUG -- :       * sudo ifconfig tap201 up
D, [12:25:06#7415] DEBUG -- :   => Create BRIDGE0 using:
D, [12:25:06#7415] DEBUG -- :     * sudo ifconfig bridge0 create 2>/dev/null;
D, [12:25:06#7415] DEBUG -- :     * sudo ifconfig bridge0  addm tap201
D, [12:25:06#7415] DEBUG -- :     * sudo ifconfig bridge0  addm tap202
D, [12:25:06#7415] DEBUG -- :     * sudo ifconfig bridge0  addm lagg0
D, [12:25:06#7415] DEBUG -- :     * sudo ifconfig bridge0 up
D, [12:25:06#7415] DEBUG -- :     => Create TAP101 using:
D, [12:25:06#7415] DEBUG -- :       * sudo ifconfig tap101 create mtu 1500
D, [12:25:06#7415] DEBUG -- :       * sudo ifconfig tap101 up
D, [12:25:06#7415] DEBUG -- :   => Create VLAN101 using:
D, [12:25:06#7415] DEBUG -- :     * sudo ifconfig vlan101 create vlan 101 vlandev tap101
D, [12:25:06#7415] DEBUG -- :     * sudo ifconfig vlan101 up

YAML Description file

The file must have a root node which identify the setup. Usually this is the machine name for which the configuration is, but it can be anything.

Then comes :

  • a hash
  • a array
  • a symbole;

Each element of the hash will become the “final” interface of your setup. Everything under them will be used to describe composed interface.

To describe a composed interface you can use a array or a hash. Every hash must terminate either by a symbol, a array or a hash whose values are nil. For instance this describe the same setup, bridge with two interfaces:

  1. using a array;
  2. using a hash;

The first form is better.

A simple interface is a tap device. A composed interface is a:

  • bridge;
  • lagg;
  • vlan;

An <id> is only there to differentiate similar interface. tap101 and tap102 are tap interfaces, whose id is different.

For vlan there is a <vid> and optional <id> component. This is useful if you want several interface tagged with the same vid. vlan101, vlan10101 describe two vlan whose vid is 101.

Type of interface avalaible

  • lagg<id>: creates a aggregated link (usually name bond under Linux and .. lagg under Freebsd). Must be composed multiple of simple interfaces or composed interface. All must be the same MTU;
  • bridge<id>: creates a bridge. Can be composed of multiple simple interface or composed interfaces. All must be the same MTU;
  • =vlan<vid>[<id>]: Create a vlan. Must be composed of a single simple or composed interface.
  • tap<id>: creates a tap interface.