This is the 2nd attempt. The previous was reverted while we figured out
the regional mirrors (oops).
New plan: k8s.gcr.io is a read-only facade that auto-detects your source
region (us, eu, or asia for now) and pulls from the closest. To publish
an image, push k8s-staging.gcr.io and it will be synced to the regionals
automatically (similar to today). For now the staging is an alias to
gcr.io/google_containers (the legacy URL).
When we move off of google-owned projects (working on it), then we just
do a one-time sync, and change the google-internal config, and nobody
outside should notice.
We can, in parallel, change the auto-sync into a manual sync - send a PR
to "promote" something from staging, and a bot activates it. Nice and
visible, easy to keep track of.
Automatic merge from submit-queue (batch tested with PRs 57683, 59116, 58728, 59140, 58976). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Add self anti-affinity to kube-dns pods
Otherwise the "no single point of failure" setting doesn't actually work (a single node failure can still take down the entire cluster).
Fixes#40063
```release-note
Added anti-affinity to kube-dns pods
```
```release-notes
* Logging cleanups
* Updates kube-dns to use client-go 3
* Updates containers to use alpine as the base image on all platforms
* Adds support for IPv6
```
Automatic merge from submit-queue (batch tested with PRs 53106, 52193, 51250, 52449, 53861). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
kube-dns-anti-affinity: kube-dns never-co-located-in-the-same-node
**What this PR does / why we need it**:
This is upstreaming the kubernetes/kops#2705 pull request by @jamesbucher that was originally against [kops](github.com/kubernetes/kops).
Please see kubernetes/kops#2705 for more details, including a lengthy discussion.
Briefly, given the constraints of how the system works today:
+ if you need multiple DNS pods primarily for availability, then requiredDuringSchedulingIgnoredDuringExecution makes sense because putting more than one DNS pod on the same node isn't useful
+ if you need multiple DNS pods primarily for performance, then
preferredDuringScheduling IgnoredDuringExecution makes sense because it will allow the DNS pods to schedule even if they can't be spread across nodes
**Which issue this PR fixes**
fixeskubernetes/kops#2693
**Release note**:
```release-note
Improve resilience by annotating kube-dns addon with podAntiAffinity to prefer scheduling on different nodes.
```
Changes:
- Support kube-master-url flag without kubeconfig
- Fix concurrent R/Ws in dns.go
- Fix confusing logging when initialize server
- Fix printf in cmd/kube-dns/app/server.go
- Fix version on startup and --version flag
- Support specifying port number for nameserver in stubDomains
Automatic merge from submit-queue (batch tested with PRs 41826, 42405)
Add stubDomains and upstreamNameservers configuration to kube-dns
```release-note
Updates the dnsmasq cache/mux layer to be managed by dnsmasq-nanny.
dnsmasq-nanny manages dnsmasq based on values from the
kube-system:kube-dns configmap:
"stubDomains": {
"acme.local": ["1.2.3.4"]
},
is a map of domain to list of nameservers for the domain. This is used
to inject private DNS domains into the kube-dns namespace. In the above
example, any DNS requests for *.acme.local will be served by the
nameserver 1.2.3.4.
"upstreamNameservers": ["8.8.8.8", "8.8.4.4"]
is a list of upstreamNameservers to use, overriding the configuration
specified in /etc/resolv.conf.
```
Updates the dnsmasq cache/mux layer to be managed by dnsmasq-nanny.
dnsmasq-nanny manages dnsmasq based on values from the
kube-system:kube-dns configmap:
"stubDomains": {
"acme.local": ["1.2.3.4"]
},
is a map of domain to list of nameservers for the domain. This is used
to inject private DNS domains into the kube-dns namespace. In the above
example, any DNS requests for *.acme.local will be served by the
nameserver 1.2.3.4.
"upstreamNameservers": ["8.8.8.8", "8.8.4.4"]
is a list of upstreamNameservers to use, overriding the configuration
specified in /etc/resolv.conf.
Automatic merge from submit-queue
move kube-dns to a separate service account
Switches the kubedns addon to run as a separate service account so that we can subdivide RBAC permission for it. The RBAC permissions will need a little more refinement which I'm expecting to find in https://github.com/kubernetes/kubernetes/pull/38626 .
@cjcullen @kubernetes/sig-auth since this is directly related to enabling RBAC with subdivided permissions
@thockin @kubernetes/sig-network since this directly affects now kubedns is added.
```release-note
`kube-dns` now runs using a separate `system:serviceaccount:kube-system:kube-dns` service account which is automatically bound to the correct RBAC permissions.
```
These files have been created lately, so we don't have much information
about them anyway, so let's just:
- Remove assignees and make them approvers
- Copy approves as reviewers
Automatic merge from submit-queue
Adds docs for dns-horizontal-autoscaler and kube-dns
Although we have separate docs on kubernetes.io, we should have a short description about the dns-horizontal-autoscaler addon in folder.
Also updates kube-dns README with example command to scale kube-dns Deployment. This is needed because Addon Manager v6 has stricter reconcile behavior.
@bowei @bprashanth @thockin
- Adds command line flags --config-map, --config-map-ns.
- Fixes 36194 (https://github.com/kubernetes/kubernetes/issues/36194)
- Update kube-dns yamls
- Update bazel (hack/update-bazel.sh)
- Update known command line flags
- Temporarily reference new kube-dns image (this will be fixed with
a separate commit when the DNS image is created)
Tim Hockin