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默认启动是随机的主机命名，需要在启动的时候添加一个 --cap-add SYS_ADMIN
Is there any way to use hostname command in the container? · Issue #8902 · moby/moby (github.com)
bash
sudo docker run --cap-add SYS_ADMIN --name u18 -it -v ~/:/host-home ubuntu:18.04 /bin/bash