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Dev Docker Image

This image is used for development and debugging.

What is included:

  • VPP-Agent with default config files and ready to use
  • VPP (compatible with VPP-Agent) including source code and build artifacts
  • development environment with all requirements needed to build both the VPP and VPP-Agent itself
  • code generation tools for proto models (gogoprotobuf) and also VPP binary API using GoVPP generator)
  • several other development utilities (agentctl, vpp-agent-ctl)

Get the official image

For a quick start with the development image, you can download the official image from DockerHub.

$ docker pull docker.io/ligato/dev-vpp-agent	# latest release (stable)
$ docker pull docker.io/ligato/dev-vpp-agent:pantheon-dev	# bleeding edge (unstable)

List of all available docker image tags for development image can be found here.

Building the image locally

To build the docker image on your local machine run:

$ ./build.sh

This will by default build image with name dev_vpp_agent and use following sources:

  • VPP-Agent version from local repository
  • VPP from repository and commit specified in vpp.env file

Build VPP in debug mode

By default the image builds VPP .deb packages in release mode. You can change mode to debug by setting the environmental variable:

$ VPP_DEBUG_DEB=y ./build.sh

Note: This will only build the .deb packages in debug mode. The running mode of the VPP can be changed to debug by setting RUN_VPP_DEBUG=y environmental variable for the container.

Verifying the built image

You can verify the newly built image using:

$ docker images

You should see something like this:

REPOSITORY                       TAG                 IMAGE ID            CREATED             SIZE
dev_vpp_agent                    latest              0692f574f21a        11 minutes ago      3.58 GB
...

To inspect the details or see the history of the image use:

$ docker image inspect dev_vpp_agent
$ docker image history dev_vpp_agent

Starting the Image

By default, the VPP & the Agent processes will be started automatically in the container. This is useful e.g. for deployments with Kubernetes, as described in this README. However, this option is not really required for development purposes, and it can be overridden by specifying a different container entry point, e.g. bash, as shown below.

To start the image, type:

sudo docker run -it --name vpp_agent --privileged --rm dev_vpp_agent bash

To open another terminal into the image:

sudo docker exec -it vpp_agent bash

These environment variables can be set:

  • OMIT_AGENT - whether the start of vpp-agent should be omitted (default is unset, agent will be started normally)
  • RETAIN_SUPERVISOR - whether the supervisord should quit on unexpected exit of vpp or vpp-agent (default is unset, supervisord will quit)

Running VPP in Debug or Release Mode

You can run VPP in debug or release mode. By default the image runs in release mode. The environmental variable RUN_VPP_DEBUG=y can be used to run VPP in debug mode.

To start the image with VPP in debug mode:

sudo docker run -it --env RUN_VPP_DEBUG=y --rm --privileged dev_vpp_agent bash

Mounting VPP Build Using Volume

You can run custom build of VPP by using volume mount. The VPP build in the image is located at /opt/vpp-agent/dev/vpp.

To start the image with custom VPP build mounted from host:

sudo docker run -it --volume $HOME/myvpp:/opt/vpp-agent/dev/vpp --rm --privileged dev_vpp_agent bash

Running VPP and the Agent

NOTE: The Agent will terminate if it cannot connect to VPP and to a Etcd server. If Kafka config is specified, a successful connection to Kafka is also required. If Kafka config is not specified, the Agent will run without it, but all Kafka-related functionality will be disabled.

Start VPP in one of two modes:

  • If you don't need (or don't have) DPDK, use "vpp lite":
vpp unix { interactive } plugins { plugin dpdk_plugin.so { disable } }

Note: you most likely do not have DPDK support if you're doing development on your local laptop.

  • If you want DPDK (with no PCI devices), use:
vpp unix { interactive } dpdk { no-pci }

Note that for DPDK, you would need to run the container in privileged mode (add --privileged option to docker run). For more options, please refer to VPP documentation.

To run the Agent, do the following:

  • Edit /opt/vpp-agent/dev/etcd.conf to point the agent to an ETCD server that runs outside of the VPP/Agent container. The default configuration is:
insecure-transport: true
dial-timeout: 1000000000
endpoints: 
 - "172.17.0.1:2379"

Note that if you start Etcd in its own container on the same host as the VPP/Agent container (as described below), you can use the default endpoint configuration as is. ETCD is by default mapped onto the host at port 2379; the host's IP address will typically be 172.17.0.1, unless you change your Docker networking settings.

  • Edit /opt/vpp-agent/dev/kafka.conf to point the agent to a Kafka broker. The default configuration is:
addrs:
 - "172.17.0.1:9092"

Note that if you start Kafka in its own container on the same host as the VPP/Agent container (as described below), you can use the default broker address configuration as is. Kafka will be mapped onto the host at port 9092; the host's IP address will typically be 172.17.0.1, unless you change your Docker networking settings.

  • Start the Agent:
vpp-agent --etcd-config=/opt/vpp-agent/dev/etcd.conf --kafka-config=/opt/vpp-agent/dev/kafka.conf

Running Etcd Server on Local Host

You can run an ETCD server in a separate container on your local host as follows:

sudo docker run -p 2379:2379 --name etcd --rm \
    quay.io/coreos/etcd:v3.1.0 /usr/local/bin/etcd \
    -advertise-client-urls http://0.0.0.0:2379 \
    -listen-client-urls http://0.0.0.0:2379

The ETCD server will be available on your host OS IP (most likely 172.17.0.1 in the default docker environment) on port 2379.

Call the agent via ETCD using the testing client:

vpp-agent-ctl /opt/vpp-agent/dev/etcd.conf -tap
vpp-agent-ctl /opt/vpp-agent/dev/etcd.conf -tapd

Running Kafka on Local Host

You can start Kafka in a separate container:

sudo docker run -p 2181:2181 -p 9092:9092 --name kafka --rm \
 --env ADVERTISED_HOST=172.17.0.1 --env ADVERTISED_PORT=9092 spotify/kafka

Rebuilding the Agent

cd $GOPATH/src/github.com/ligato/vpp-agent/
git pull      # if needed
make
make test     # optional
make install

This should update the agent binary in yor $GOPATH/bin directory.

Rebuilding of the container image:

Use the --no-cache flag for docker build:

sudo docker build --no-cache -t dev_vpp_agent .

Mounting of a host directory into the Docker container:

Use -v option of the docker command:

sudo docker run -v /host/folder:/container/folder -it --name vpp_agent --privileged --rm dev_vpp_agent bash

E.g. if you have the vpp-agent code in ~/go/src/github.com/ligato/vpp-agent/ on your host OS, you can mount it as /root/go/src/github.com/ligato/vpp-agent/ in the container as follows:

sudo docker run -v ~/go/src/github.com/ligato/vpp-agent/:/root/go/src/github.com/ligato/vpp-agent/ -it --name vpp_agent --rm dev_vpp_agent bash

Then you can modify the code on you host OS and us the container for building and testing it.

Example: Using the Development Environment on a MacBook with Gogland

This section describes the setup of a lightweight, portable development environment on your local notebook (MacBook or MacBook Pro in this example). The MacBook will be the host for the Development Environment container and the folder containing the agent sources will be shared between the host and the container. Then, you can run the IDE, git, and other tools on the host and the compilations/testing in the container.

Prerequisites

  1. Get Docker for Mac. If you don't have it already installed, follow these install instructions.

  2. Install Go and the Gogland IDE. Go can be downloaded from this repository, and its install instructions are here. The download and install instructions for Gogland are here.

  3. Once you have Docker up & running on your Mac, build and verify the Development Environment container as described above.

Building and Running the Agent

For the mixed host-container environment, the folder holding the Agent source code must be setup properly on both the host and in the container. You must also set GOPATH and GOROOT appropriately in Gogland and in the development container. We will now walk you through these steps.

On your Mac:

  • Create the Go home folder, for example ~/go/

  • Create the Go source folder in your Go home folder. The Go source folder must be called src. So you will have: ~/go/src

  • In the Go source folder, create the folder that will hold the local clone of the vpp-agent repository. The path for the folder must reflect the import path in Go source code. So, the vpp-agent repository folder will be created as follows:

   cd  ~/go/src
   mkdir github.com
   mkdir github.com/ligato
  • The agent repository is located at https://github.com/ligato/vpp-agent. Go into your local vpp-agent repo folder and checkout the Agent code:
   cd github.com/ligato
   git clone https://github.com/ligato/vpp-agent.git

  • In Gogland, set GOROOT and GOPATH (Preferences->Go->GOROOT, Preferences->Go->GOPATH). Set GOROOT to where Go is installed (default: /usr/local/go) and the global GOPATH to the location of your Go home folder (/Users/jmedved/Documents/Git/go-home/ in our example).

  • Create a new project in Gogland (File->New->Project, ) will popup the project creation window. Enter your newly created Go home folder (/Users/jmedved/Documents/Git/go-home/ in our example) as the location and accept the default value for the SDK. Click Create, and you should now be able to browse the Agent source code in Gogland.

  • Start the Development Environment container with the -v option, mounting the Go home folder in the container. With our example, and assuming that we want to mount our Go home folder into the root/go-home folder, type:

   sudo docker run -v ~/go/src/github.com/ligato/vpp-agent/:/root/go/src/github.com/ligato/vpp-agent/ -it --name vpp_agent --rm dev_vpp_agent bash

The above command will put you into the Development Environment container console.

In the container console:

  • Setup the GOPATH and PATH variables in the Development Environment container:
   export GOPATH=/root/go
   export PATH=/$GOPATH/bin:$PATH
  • Change directory into the vpp-agent folder and build & install the Agent:
   cd /root/go-home/src/github.com/ligato/vpp-agent
   make
   make install