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centos7 Docker 同一個宿主機器上容器間相互訪問 No route to host

When running Docker natively on Linux, you can access host services using the IP address of the docker0 interface. From inside the container, this will be your default route.

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# firewall-cmd --zone=public --add-port=8081/tcp --permanent

firewall-cmd --reload

systemctl restart firewalld.service