An automatic security update installed on one (1) of the Tendenci Docker servers in our AWS US-East data center on Sunday May 8th at approximately 11:10pm CST.
The update included changes to the file system to increase security. The automatic conversion took significantly longer than prior updates resulting in some sites being offline during this time period.
Reference the release notes on Dockers 1.11.1 here for more technical detail: https://github.com/docker/docker/releases/tag/v1.11.1
Security can not and will not be compromised. Our focus instead is on redundancy (multiple copies of sites/automatic fail over).
Our response will be explained further when our after-action incident review is complete.