From the blog post: > We have tightened Docker’s default access control configuration, to make it more suitable for use on a host machine shared with untrusted

From the blog post: > We have tightened Docker’s default access control configuration, to make it more suitable for use on a host machine shared with untrusted applications. Running docker commands now requires either root privileges, or a user account included in the “docker” group. > This means that after upgrading to 0.6, you will need sudo to run docker commands. > Don’t worry, you can revert your configuration with the “-H” flag. Just make sure you understand the security implications!