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Add CoreDNS support with various fixes

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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
This commit is contained in:
woopstar
2018-03-13 12:00:05 +01:00
committed by Andreas Kruger
parent d264da8f08
commit e40368ae2b
20 changed files with 369 additions and 67 deletions
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8
docs/dns-stack.md
View File

@@ -62,6 +62,14 @@ other queries are forwardet to the nameservers found in ``upstream_dns_servers``
This does not install the dnsmasq DaemonSet and instructs kubelet to directly use kubedns/skydns for
all queries.
#### coredns
This does not install the dnsmasq DaemonSet and instructs kubelet to directly use CoreDNS for
all queries.
#### coredns_dual
This does not install the dnsmasq DaemonSet and instructs kubelet to directly use CoreDNS for
all queries. It will also deploy a secondary CoreDNS stack
#### manual
This does not install dnsmasq or kubedns, but allows you to specify
`manual_dns_server`, which will be configured on nodes for handling Pod DNS.

7
docs/vars.md
View File

@@ -63,7 +63,8 @@ following default cluster paramters:
bits in kube_pods_subnet dictates how many kube-nodes can be in cluster.
* *dns_setup* - Enables dnsmasq
* *dnsmasq_dns_server* - Cluster IP for dnsmasq (default is 10.233.0.2)
* *skydns_server* - Cluster IP for KubeDNS (default is 10.233.0.3)
* *skydns_server* - Cluster IP for DNS (default is 10.233.0.3)
* *skydns_server_secondary* - Secondary Cluster IP for CoreDNS used with coredns_dual deployment (default is 10.233.0.4)
* *cloud_provider* - Enable extra Kubelet option if operating inside GCE or
OpenStack (default is unset)
* *kube_hostpath_dynamic_provisioner* - Required for use of PetSets type in
@@ -105,9 +106,9 @@ Stack](https://github.com/kubernetes-incubator/kubespray/blob/master/docs/dns-st
* *http_proxy/https_proxy/no_proxy* - Proxy variables for deploying behind a
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.
* *kubelet_deployment_type* - Controls which platform to deploy kubelet on.
Available options are ``host``, ``rkt``, and ``docker``. ``docker`` mode
is unlikely to work on newer releases. Starting with Kubernetes v1.7
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).
* *kubelet_load_modules* - For some things, kubelet needs to load kernel modules. For example,