因为我需要更新版本的docker-compose，所以我也需要更新版本的docker-engine。我试过了:

before_install:
  - sudo apt-get install -qq docker-engine

Configuration file '/etc/default/docker'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** docker (Y/I/N/O/D/Z) [default=N] ? 

最佳答案

确保使用正确的Travis CI环境Trusty beta environment。

然后查看Travis文档updating your Docker Compose here。

https://stackoverflow.com/questions/36186848/