Skydive is an open source real-time network topology and protocols analyzer. It aims to provide a comprehensive way of understanding what is happening in the network infrastructure.

Skydive agents collect topology informations and flows and forward them to a central agent for further analysis. All the informations a stored in an Elasticsearch database.

Skydive is SDN-agnostic but provides SDN drivers in order to enhance the topology and flows informations. Currently only the Neutron driver is provided but more drivers will come soon.

Topology probes currently implemented:

• OVSDB
• NetLINK
• NetNS
• Ethtool

Flow probes currently implemented:

• sFlow

• Go >= 1.5
• Elasticsearch >= 2.0

Make sure you have a working Go environment. [See the install instructions] (http://golang.org/doc/install.html).

Then make sure you have Godep installed. [See the install instructions] (https://github.com/tools/godep).

$ go get github.com/redhat-cip/skydive/cmd/skydive

Skydive relies on two main components:

• skydive agent, has to be started on each node where the topology and flows informations will be captured
• skydive analyzer, the node collecting data captured by the agents

For a single node setup, the configuration file is optional. For a multiple node setup, the analyzer IP/PORT need to be adapted.

Processes are bound to 127.0.0.1 by default, you can explicitly change binding address with "listen: 0.0.0.0:port" in the proper configuration sections.

See the full list of configuration parameters in the sample configuration file etc/skydive.yml.default.

$ skydive agent [--conf etc/skydive.yml]

$ skydive analyzer [--conf etc/skydive.yml]

To access to the WebUI of agents or analyzer:

http://<address>:<port>

Skydive client allows you to start flow captures on topology Nodes/Interfaces

$ skydive client capture create -p <probe path>

The probe path parameter references the interfaces where the flow probe will be started, so where the capture will be done.

The format of a probe path follows the links between topology nodes from a host node to a target node :

host1[Type=host]/.../node_nameN[Type=node_typeN]

The node name can be the name of :

• a host
• an interface
• a namespace

The node types can be :

• host
• netns
• ovsbridge

Currently target node types supported are :

• ovsbridge
• veth
• device
• internal
• tun
• bridge

To start a capture on the OVS bridge br1 on the host host1 the following probe path is used :

$ skydive client capture create -p "host1[Type=host]/br1[Type=ovsbridge]""

A wilcard for the host node can be used in order to start a capture on all hosts.

$ skydive client capture create -p "*/br1[Type=ovsbridge]"

A capture can be defined in advance and will start when a topology node will match.

To delete a capture :

$ skydive client capture delete <probe path>

Topology informations are accessible through HTTP or a WebSocket API

HTTP endpoint:

curl http://<address>:<port>/rpc/topology

WebSocket endpoint:

ws://<address>:<port>/ws/graph

Messages:

• NodeUpdated
• NodeAdded
• NodeDeleted
• EdgeUpdated
• EdgeAdded
• EdgeDeleted

Skydive provides a DevStack plugin that can be used in order to have Skydive Agents/Analyzer configured and started with the proper probes by DevStack.

For a single node setup adding the following lines to your local.conf file should be enough.

enable_plugin skydive https://github.com/redhat-cip/skydive.git

enable_service skydive-agent skydive-analyzer

The plugin accepts the following parameters:

# Address on which skydive analyzer process listens for connections.
# Must be in ip:port format
#SKYDIVE_ANALYZER_LISTEN=

# Inform the agent about the address on which analyzers are listening
# Must be in ip:port format
#SKYDIVE_AGENT_ANALYZERS=

# ip:port address on which skydive agent listens for connections.
#SKYDIVE_AGENT_LISTEN=

# The path for the generated skydive configuration file
#SKYDIVE_CONFIG_FILE=

# List of agent probes to be used by the agent
# Ex: netns netlink ovsdb
#SKYDIVE_AGENT_PROBES=

# Remote port for ovsdb server.
#SKYDIVE_OVSDB_REMOTE_PORT=6640

This project accepts contributions. Skydive uses the Gerrit workflow through Software Factory.

http://softwarefactory-project.io/r/#/q/project:skydive

git clone http://softwarefactory-project.io/r/skydive

git-review installation :

yum install git-review

or

apt-get install git-review

or to get the latest version

sudo pip install git-review

Create a topic branch :

git checkout -b TOPIC-BRANCH

Submit your change :

git review

Updating your Change :

git commit -a --amend
git review

For a more complete documentation about how to contribute to a gerrit hosted project.

• IRC: #skydive-project on irc.freenode.net

This software is licensed under the Apache License, Version 2.0 (the "License"); you may not use this software except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.