cd /path/to/netty/
docker-compose -f docker/docker-compose.yaml -f docker/docker-compose.centos-6.111.yaml run test
docker-compose -f docker/docker-compose.yaml run cross-compile-aarch64-build
The default version of aarch64 gcc is 4.9-2016.02. Update the parameter gcc_version in docker-compose.yaml to use a version you want.
etc, etc