Docker
Often times, you'll want to use Docker to run Pact. For example, a common approach is to run all CI builds within a docker container. This guide offers some assistance in those wanting to pursue this path.
Official Docker Images​
We provide official containers to run common utilities as Docker images. All images from the "pactfoundation" repository can be considered official:
- Mock Server: https://hub.docker.com/r/pactfoundation/pact-ref-mock-server
- Stub Server: https://hub.docker.com/r/pactfoundation/pact-stub-server
- Provider Verifier: https://hub.docker.com/r/pactfoundation/pact-ref-verifier
- CLI Tools: https://hub.docker.com/r/pactfoundation/pact-cli(Pact Broker client tool plus the Ruby implementation of the mock service & provider verifier.)
- Pact Broker: https://hub.docker.com/r/pactfoundation/pact-broker/
Running Pact on Docker​
If you want to run your Pact tests in Docker, please note the following guidance.
Requirements​
For Pact implementations that use the Rust shared core​
Applicable languages: Pact JS, Pact .NET, Pact Go, Pact-PHP, Pact C++ and Pact Swift
Pact currently requires glibc >= 2.23. Most modern debian-based images will ship with a compatible version.
You can check the version of glibc installed via the ldd command:
> ldd --version
ldd (Debian GLIBC 2.31-13+deb11u3) 2.31
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.
If you see an error that looks like the following, taken from a JS project, it means your version of glibc is incompatible:
/lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.23' not found (required by /app/node_modules/@pact-foundation/pact-core/build/Release/libpact_ffi.so)
For a more exhaustive list of glibc versions against distroes, see the below table
| Distribution | glibc version |
|---|---|
| Arch Linux | 2.36 |
| Alpine 3.13 | N/A |
| CentOS 7 | 2.17 |
| CentOS Stream 8 | 2.28 |
| CentOS Stream 9 | 2.34 |
| Debian 9 (Stretch) | 2.24 |
| Debian 10 (Buster) | 2.28 |
| Debian 11 (Bullseye) | 2.31 |
| Fedora 35 | 2.34 |
| Homebrew | 2.23 |
| OpenSUSE Leap 15.3 | 2.31 |
| OpenSUSE Tumbleweed | 2.35 |
| RHEL 7 | 2.17 |
| RHEL 8 | 2.28 |
| RHEL 9 | 2.34 |
| Ubuntu 18.04 | 2.27 |
| Ubuntu 20.04 | 2.31 |
| Ubuntu 22.04 | 2.35 |
For Pact implementations that use the Ruby shared core​
Applicable languages: Python
Pact currently requires glibc >= 2.17. The minimum supported Linux version is now RHEL 7 / CentOS 7 / Debian 8 / Ubuntu 14.06 / glibc 2.17.
Example​
Here is an example JS container that will run Pact tests within an official Node container based on Debian.
FROM node:20
WORKDIR /app
COPY package*.json /app/
RUN npm install
COPY . /app/
RUN npm test
Alpine Linux​
Many teams choose to run builds on Alpine Linux due to its tiny footprint, and smaller security surface area.
For Pact implementations that use the Rust shared core or​
Applicable languages: Pact JS, Pact .NET, Pact Go, Pact-PHP, Pact C++ and Pact Swift
- Executable builds are static, and therefore the single binary works across musl or glibc based distros (excluding ffi)
- pact_ffi library comes in both static
*.a& shared*.sovariants for musl, depending on the consuming client libraries requirements for ffi interop
Support is available in the following tools for Alpine from specific versions.
| library | alpine support | version |
|---|---|---|
| pact_ffi | ✅ | - x86_64 .a from 0.2.4 |
- aarch64 .a from 0.4.15 | ||
- .so from 0.4.17 | ||
| pact_mock_server_cli | ✅ | - 1.0.5 |
| pact_verifier_cli | ✅ | - 1.1.1 |
| pact-stub-server | ✅ | - 0.6.0 |
| pact-plugin-cli | ✅ | - 0.1.2 |
| pact-protobuf-plugin | ✅ | - 0.3.15 |
| pact-csv-plugin | ✅ | - 0.0.6 |
Reference Image​
Here is an example NodeJS container that can be used as a reference to create a working container for your example:
FROM node:20-alpine
WORKDIR /app
COPY package*.json /app/
RUN npm install
COPY . /app/
RUN npm test
For Pact implementations that use the Ruby shared core​
Applicable languages: Python
You'll need to ensure the following dependencies are met:
- Standard CAs for TLS network communication
- glibc (>= 2.17)
NOTE: You do not need to install Ruby. The distribution takes care of this for you.
Reference Image​
Here is an example NodeJS container that can be used as a reference to create a working container for your example:
FROM node:20-alpine
WORKDIR /app
COPY package*.json /app/
RUN npm install
COPY . /app/
RUN npm test
For all other languages​
Applicable languages: Pact JVM, pact4s, Rust, Ruby
There are no specific requirements for Pact in these environments, you should be able to follow the standard guidance for your specific runtime.