Description

Current state of things:

• Those distros are supported as per http://docs.docker.com/installation/rhel/and http://docs.docker.com/installation/centos/
• RedHat themselves only support Docker on RHEL7 (as stated by https://access.redhat.com/solutions/1378023, and confirmed by several people)
• 1.7.0 is broken on these (most notably because of libnetwork bridge creation code: 1.7.0/CentOS/RHEL 6.6 - bridge interface creation fails. daemon won't start. #14024)

We shipped 1.7.0 without mentioning we would break compatibility, so this will be fixed in 1.7.1, but we will drop support in 1.8.0.

How to

• Documentation update
• Consider making --userland-proxy=false a default?
• Drop older kernel compatibility code (cf. bridge creation fallback, there's probably more)

References

• Continued RHEL/CentOS6.6+ support #14174
• RedHat support ticket

Ping @moxiegirl @thaJeztah to anticipate documentation change and spread the words on related issues / PRs!