This repository contains the source code for Project Calico's optional Typha daemon. An instance of Typha sits between the datastore (such as the Kubernetes API server) and many instances of Felix.

This has many advantages:

• Since one Typha instance can support hundreds of Felix instances, it reduces the load on the datastore by a large factor.

• Since Typha can filter out updates that are not relevant to Felix, it also reduces Felix's CPU usage. In a high-scale (100+ node) Kubernetes cluster, this is essential because the number of updates generated by the API server scales with the number of nodes.

We recommend using Typha only if you're using the Kubernetes API Datastore and you have more than 50 Kubernetes nodes. While Typha can be used with etcd, etcd v3 is optimised to handle many clients already so we do not recommend adding Typha if you're using etcd.

Follow the "more than 50 nodes" section in the Calico for Kubernetes getting started guide.

The best place to ask a question or get help from the community is the calico-users #slack. We also have an IRC channel.

Tigera, Inc. is the company behind Project Calico and is responsible for the ongoing management of the project. However, it is open to any members of the community – individuals or organizations – to get involved and contribute code.

Thanks for thinking about contributing to Project Calico! The success of an open source project is entirely down to the efforts of its contributors, so we do genuinely want to thank you for even thinking of contributing.

Before you do so, you should check out our contributing guidelines in the CONTRIBUTING.md file, to make sure it's as easy as possible for us to accept your contribution.

Typha mostly uses Docker for builds. We develop on Ubuntu 16.04 but other Linux distributions should work (there are known Makefile that prevent building on OS X).
To build Typha, you will need:

• A suitable linux box.
• To check out the code into your GOPATH.
• Docker >=1.12
• GNU make.

Then, as a one-off, run

make update-tools

which will install a couple more go tools that we haven't yet containerised.

Then, to build the calico-typha binary:

make bin/calico-typha

or, the calico/typha docker image:

make image

To run all the UTs:

make ut

To start a ginkgo watch, which will re-run the relevant UTs as you update files:

make ut-watch

To get coverage stats:

make cover-report

or

make cover-browser

If you want to be able to run unit tests for specific packages for more iterative development, you'll need to install

• GNU make
• go >=1.7

then run make update-tools to install ginkgo, which is the test tool used to run Typha's unit tests.

There are several ways to run ginkgo. One option is to change directory to the package you want to test, then run ginkgo. Another is to use ginkgo's watch feature to monitor files for changes:

cd go
ginkgo watch -r

Ginkgo will re-run tests as files are modified and saved.

After building the docker image (see above), you can run Typha and log to screen with, for example: docker run --privileged --net=host -e TYPHA_LOGSEVERITYSCREEN=INFO calico/typha