ERROR: Rancher must be ran with the --privileged flag when running outside of Kubernetes

按照rancher2.4的官网文档， 只需要一台 Linux 主机，记可以快速部署一个单节点的rancher server, 当然这只能做测试使用 。 部署十分方便，只需在主机上启动dcoker, 然后起一个容器：

sudo docker run -d --restart=unless-stopped -p 80:80 -p 443:443 rancher/rancher

测试一下发现，容器启动后在不断重启，没有办法进入UI， 提示网络错误。

ConTAINER ID        IMAGE               COMMAND             CREATED             STATUS                         PORTS               NAMES
bfd5c52a1ce7        rancher/rancher     "entrypoint.sh"     12 hours ago        Restarting (1) 3 seconds ago                       elated_heisenberg

查看日志：

[root@k8s-node02 ~]# docker logs --tail 3 bfd5c52a1ce7
ERROR: Rancher must be ran with the --privileged flag when running outside of Kubernetes
ERROR: Rancher must be ran with the --privileged flag when running outside of Kubernetes
ERROR: Rancher must be ran with the --privileged flag when running outside of Kubernetes

发现报错说 需要 --privileged，增加特权。
关掉重起加 --privileged 试试：

docker run -d --restart=unless-stopped --privileged  -p 80:80  -p 443:443 rancher/rancher

发现可以了