Remove rkt support (#4671)

docs/ansible.md

@@ -70,7 +70,7 @@ The group variables to control main deployment options are located in the direct
 Optional variables are located in the `inventory/sample/group_vars/all.yml`.
 Mandatory variables that are common for at least one role (or a node group) can be found in the
 `inventory/sample/group_vars/k8s-cluster.yml`.
-There are also role vars for docker, rkt, kubernetes preinstall and master roles.
+There are also role vars for docker, kubernetes preinstall and master roles.
 According to the [ansible docs](http://docs.ansible.com/ansible/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable),
 those cannot be overridden from the group vars. In order to override, one should use
 the `-e ` runtime flags (most simple way) or other layers described in the docs.

docs/roadmap.md

@@ -2,7 +2,7 @@ Kubespray's roadmap
 =================
 
 ### Self deployment (pull-mode) [#320](https://github.com/kubespray/kubespray/issues/320)
-- the playbook would install and configure docker/rkt and the etcd cluster
+- the playbook would install and configure docker and the etcd cluster
 - the following data would be inserted into etcd: certs,tokens,users,inventory,group_vars.
 - a "kubespray" container would be deployed (kubespray-cli, ansible-playbook)
 - to be discussed, a way to provide the inventory

docs/vars.md

@@ -102,7 +102,7 @@ Stack](https://github.com/kubernetes-sigs/kubespray/blob/master/docs/dns-stack.m
   proxy. Note that no_proxy defaults to all internal cluster IPs and hostnames
   that correspond to each node.
 * *kubelet_deployment_type* - Controls which platform to deploy kubelet on.
-  Available options are ``host``, ``rkt``, and ``docker``. ``docker`` mode
+  Available options are ``host`` and ``docker``. ``docker`` mode
   is unlikely to work on newer releases. Starting with Kubernetes v1.7
   series, this now defaults to ``host``. Before v1.7, the default was Docker.
   This is because of cgroup [issues](https://github.com/kubernetes/kubernetes/issues/43704).
@@ -113,7 +113,7 @@ Stack](https://github.com/kubernetes-sigs/kubespray/blob/master/docs/dns-stack.m
 * *kubelet_cgroup_driver* - Allows manual override of the
   cgroup-driver option for Kubelet. By default autodetection is used
   to match Docker configuration.
-* *kubelet_rotate_certificates* - Auto rotate the kubelet client certificates by requesting new certificates 
+* *kubelet_rotate_certificates* - Auto rotate the kubelet client certificates by requesting new certificates
   from the kube-apiserver when the certificate expiration approaches.
 * *node_labels* - Labels applied to nodes via kubelet --node-labels parameter.
   For example, labels can be set in the inventory as variables or more widely in group_vars.