[YARN-7814] Remove automatic mounting of the cgroups root directory into Docker containers

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.1.0
• Labels: Docker
• Hadoop Flags: Reviewed
• Assignee: Shane Kumpf
• Reporter: Shane Kumpf
• Due: 28/Feb/18
• Created: 24/Jan/18 22:24
• Updated: 02/May/18 22:34
• Resolved: 26/Jan/18 01:50

Description

Currently, all Docker containers launched by DockerLinuxContainerRuntime get /sys/fs/cgroup automatically mounted. Now that user supplied mounts (YARN-5534) are in, containers that require this mount can request it (with a properly configured mount whitelist).

I propose we remove the automatic mounting of /sys/fs/cgroup into Docker containers.

Issue Links

• is duplicated by: YARN-7233 Make the cgroup mount into Docker containers configurable
• supercedes: YARN-7231 Make Docker target directory for cgroups configurable by yarn-site.xml
• supercedes: YARN-7232 Consider /sys/fs/cgroup as the default CGroup mount path