Added CoreDNS to downloads

Updated with labels. Should now work without RBAC too

Fix DNS settings on hosts

Rename CoreDNS service from kube-dns to coredns

Add rotate based on http://edgeofsanity.net/rant/2017/12/20/systemd-resolved-is-broken.html

Updated docs with CoreDNS info

Added labels and fixed minor settings from official yaml file: https://github.com/kubernetes/kubernetes/blob/release-1.9/cluster/addons/dns/coredns.yaml.sed

Added a secondary deployment and secondary service ip. This is to mitigate dns timeouts and create high resitency for failures. See discussion at 'https://github.com/coreos/coreos-kubernetes/issues/641#issuecomment-281174806'

Set dns list correct. Thanks to @whereismyjetpack

Only download KubeDNS or CoreDNS if selected

Move dns cleanup to its own file and import tasks based on dns mode

Fix install of KubeDNS when dnsmask_kubedns mode is selected

Add new dns option coredns_dual for dual stack deployment. Added variable to configure replicas deployed. Updated docs for dual stack deployment. Removed rotate option in resolv.conf.

Run DNS manifests for CoreDNS and KubeDNS

Set skydns servers on dual stack deployment

Use only one template for CoreDNS dual deployment

Set correct cluster ip for the dns server

Fix Docker exits prematurely

Fix issues #2451 Support docker-ce and docker-engine

fix nodePort for weave

Fix indexing of supplementary DNS in openssl.conf

Explicitly defines the --kubelet-preferred-address-types parameter

details:https://github.com/moby/moby/pull/31490/files

Support docker-ce and docker-engine include redhat/centos ubuntu debian

FIXUP #2424: local_provisioner directory should be created only if enabled

Update OpenStack contrib to use per-cluster inventory layout

Fix kubernetes cert permission sync

Prefix system:node CRB

Add `state: directory` to `file` task so that `recurse: yes` will actually take effect and ensure
certs/keys have the right file mode and owner

Change the name of `system:node` CRB to `kubespray:system:node` to avoid
conflicts with the auto-reconciled CRB also named `system:node`

Fixes #2121

Fix always download calico_rr image

Fix systemd version detection

clean http-proxy.conf

Remove nodes

Drain node except daemonsets resource
Use reset cluser for delete deploy data
Then delete node

Enable OOM killing for etcd-events

fix the name of some variable

kube Module Enhancements

* Multiple files are now supported across operations.
  * Can be specified as a list or a comma separated string.
  * Single item per task params will still work without changes.
* Added `files`, `filenames`, and `file`, as aliases for the `filename` param.
* Improved output of error message to always include stderr
* `exists` now supports checking files

Follow up PRs encouraged across roles to start converting `with_items` loops on `kube` tasks into `files` param lists so we can improve performance.

Change "command" to "shell" in order for the pipe to work correctly

Add Custom ConfigMap Support for ingress-nginx

Remove DigitalOcean

add tip to large-deployments.doc

* Use docker-ce 17.03.2
* Docker-engine may be discarded

Support Centos/Fedora atomic host

set the ``etcd_events_cluster_setup: true`` store events
in a separate dedicated etcd instance.

Add labels for ingress_nginx_namespace

Adding ssh_private_key_file to ProxyCommand

Enable OOM killing like docker run etcd