问题
Docker build时Dockerfile有RUN命令执行报错shim error: docker-runc not installed on system，如下：
解决方法
修改/etc/docker/daemon.json，添加正面内容
{"runtimes": {"docker-runc": {"path": "/usr/libexec/docker/docker-runc-current"}},"add-runtime": "docker-runc=/usr/libexec/docker/docker-runc-current","default-runtime": "docker-runc"
}
保存退出，然后重启Docker即可
systemctl daemon-reload
systemctl start docker
)
