The Xenial Build Environment

What This Guide Covers #

This guide provides an overview of the packages, tools and settings available in the Xenial environment.

Using Xenial #

To route your builds to Ubuntu Xenial 16.04, add the following to your .travis.yml:

dist: xenial

Please note that Xenial is available on our hosted fully virtualized infrastructure. If you are running an Enterprise installation, please reach out to to see how you can use the Xenial Docker images.

Differences from the Trusty images #

Xenial includes the following changes and improvements:

Third party apt-repositories removed #

While third party apt-repositories are used during the Xenial image provisioning, they are all removed from the Xenial build image. This has two benefits; a) reduced risk of unrelated interference and b) faster apt-get updates.

To specify a third party apt-repository, you can add the source with the apt addon and specify the packages. For example:

dist: xenial
      - ppa:chris-lea/redis-server
    - redis-tools
    - redis-server

If you depend on these repositories in your build, you can use the following source line to get them back:

package source
couchdb ppa:couchdb/stable
docker docker-xenial
google-chrome-stable google-chrome
git-lfs github-git-lfs-xenial
git-ppa ppa:git-core/ppa
haskell ppa:hvr/ghc
mongodb mongodb-4.0-xenial
pollinate ppa:pollinate/ppa
redis ppa:chris-lea/redis-server

Services disabled by default #

On our Xenial infrastructure, to speed up boot time and improve performance we’ve disabled all services, including the ones that are started by default on Trusty. Add any services that you want to start by default to your .travis.yml:

  - mysql
  - redis

Environment common to all Xenial images #

The following versions of Docker, version control software and compilers are present on all builds, along with more language specific software described in more detail in each language section.

All preinstalled software not provided by distro is installed from an official release – either a prebuilt binary if available, or a source release built with default options. For preinstalled language interpreters, a standard version manager like rvm is used if available for the language.

Version control #

package version
git 2.21.0
git-lfs 2.6.1
hg 4.8
svn 1.9.3

Compilers and Build toolchain #

  • clang and llvm 7
  • cmake 3.12.4
  • gcc 5.4.0
  • ccache 3.2.4
  • shellcheck 0.6.0
  • shfmt 2.6.3

Docker #

  • Docker 18.06.0-ce is installed
  • docker-compose 1.23.1.

Ruby support #

  • Pre-installed Rubies: 2.4.5 and 2.5.3.
  • The default ruby is 2.5.3p105.
  • Other ruby versions can be installed during build time.

Python support #

  • Supported Python versions: 2.7, 3.4 or higher.
  • Pre-installed Python versions: 2.7.15, 3.6.7, and 3.7.1.
  • Python 3.6.7 will be used when no language version is explicitly set.

If you’re getting errors about PyPy pypy is not installed; attempting download, use one of the more recent python versions such as pypy2.7-6.0 or pypy3.5-6.0.

JavaScript and Node.js support #

  • For builds specifying language: node_js, nvm is automatically updated to the latest version at build time. For other builds, the stable version at image build time has been selected, which is 0.33.11.
  • The following NodeJS versions are preinstalled: 11.0.0 and 8.12.0.

Go support #

  • Pre-installed Go: 1.11.1

  • Other Go versions can be installed during build time by specifying the language versions with the go:-key.

JVM (Clojure, Groovy, Java, Scala) support #

  • Pre-installed JVMs: openjdk8, openjdk10, and openjdk11 on x86, default is openjdk8; openjdk7 and openjdk8 on ppc64le.

  • Other JDKs, including Oracle’s, can be acquired if available by specifying jdk.

  • The following table summarizes the Pre-installed JVM tooling versions:

package version
gradle 5.1.1
maven 3.6.0
groovy 2.4.5

Perl support #

  • Default version on Xenial is 5.22
  • Supported versions 5.22, 5.24, 5.26, 5.28 and 5.30 can be installed by using the perl:-key.

PHP support #

  • For dynamic runtime selection, phpenv is available.
  • The following PHP versions are preinstalled:
alias version
5.6 5.6.40
7.1 7.1.27
7.2 7.2.15

Databases and services #

The following services and databases are preinstalled but but do not run by default. To use one in your build, add it to the services key in your .travis.yml :

service version
mongodb 4.0
mysql 5.7
redis 5.0
postgresql 9.4 9.5 9.6 10

Other Ubuntu Linux Build Environments #

You can have a look at the Ubuntu Linux overview page for the different Ubuntu Linux build environments you can use.