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e7bd60ee2d
Since commit0f8fc31, the bridge driver will try to load kernel module br_netfilter if the userland proxy is disabled. If it fails, we're in unknown territory, so it's treated as an error. At the very least, containers will not be able to access host ports mapped to other containers in the same network. Before that, and before commit5c499fcdelayed the module load until it was needed - it was loaded unconditionally, but errors were only logged. So, on systems where the module is not available, or could not be loaded/configured, no error was reported and things "worked" (as long as you didn't try to use something that didn't work). That behaviour has been useful to some. So, make it possible to ignore the problem by setting env var: DOCKER_IGNORE_BR_NETFILTER_ERROR=1 Signed-off-by: Rob Murray <rob.murray@docker.com>