我正在尝试在一个正在运行的 ubuntu docker 容器中运行一些多容器构建测试，我用它来构建我的应用程序（通常，我有一个 Gitlab CI 设置）。
我发现当尝试运行指定内存限制的容器时，我遇到如下错误：
ERROR: for <service-name> Cannot start service <service-name>: OCI runtime create failed: container_linux.go:380: starting container process caused: process_linux.go:385: applying cgroup configuration for process caused: cannot enter cgroupv2 "/sys/fs/cgroup/docker" with domain controllers -- it is in threaded mode: unknown
这是一个（几乎）最小的工作示例：
# start from ubuntu base image
docker run -it --privileged ubuntu:18.04 /bin/bash
# once inside the container, install docker
apt-get update
apt-get remove docker docker-engine docker.io containerd runc
apt-get install -y apt-transport-https ca-certificates …