They tell you to use a proper FS, which is largely orthogonal to containerization.
replyWAL relies on shared memory, so while a proper FS is necessary, it isn't going to help in this case.
replyWhy does it not help if both containers can mmap the same -shm file?
replyShared memory across containers is a property of a containerization environment, not a property of a file system, "proper" or not.
replybtw nfs that is mentioned here is fine in sync mode. However that is slow.
reply