@@ -168,9 +168,9 @@ Under the hood

 Under the hood, Docker is built on the following components:

 * The

-  [cgroup](http://blog.dotcloud.com/kernel-secrets-from-the-paas-garage-part-24-c)

+  [cgroup](https://en.wikipedia.org/wiki/Cgroups)

   and

-  [namespacing](http://blog.dotcloud.com/under-the-hood-linux-kernels-on-dotcloud-part)

+  [namespacing](http://man7.org/linux/man-pages/man7/namespaces.7.html)

   capabilities of the Linux kernel

 * The [Go](https://golang.org) programming language

 * The [Docker Image Specification](https://github.com/docker/docker/blob/master/image/spec/v1.md)