This fixes #3014

The number of pods on a given node is determined by the  --max-pods=k
directive. When the address space is exhausted, no more pods can be
scheduled even if from the --max-pods-perspective, the node still has
capacity.

The special case that a pod is scheduled and uses the node IP in the
host network namespace is too "soft" to derive a guarantee.

Comparing kubelet_max_pods with kube_network_node_prefix when given
allows to assert that pod limits match the CIDR address space.

* Move front-proxy-client certs back to kube mount

We want the same CA for all k8s certs

* Refactor vault to use a third party module

The module adds idempotency and reduces some of the repetitive
logic in the vault role

Requires ansible-modules-hashivault on ansible node and hvac
on the vault hosts themselves

Add upgrade test scenario
Remove bootstrap-os tags from tasks

* fix upgrade issues

* improve unseal logic

* specify ca and fix etcd check

* Fix initialization check

bump machine size

* sysctl file should be in defaults so that it can be overriden

* Change sysctl_file_path to be consistent with roles/kubernetes/preinstall/defaults/main.yml

Changed from OS_PROJECT_ID to OS_PROJECT_NAME.

Changed from OS_PROJECT_ID to OS_PROJECT_NAME.

* allow installs to not have hostname overriden with fqdn from inventory
* calico-config no longer requires local as and will default to global
* when cloudprovider is not defined, use the inventory_hostname for cni-calico
* allow reset to not restart network (buggy nodes die with this cmd)
* default kube_override_hostname to inventory_hostname instead of ansible_hostname

Support ipvs mode for kube-proxy

Fix 'no such host' problem reported by commands *kubectl logs* and *kubectl exec*
when cloud_provider is OpenStack

Closes: #2147

Starting with Kubernetes v1.8.4, kubelet ignores the AWS cloud
provider string and uses the override hostname, which fails
Node admission checks.

Fixes #2094

Signed-off-by: Haiwei Liu <carllhw@gmail.com>

* Set host IP for kubelet always

Use ansible default IP if ip var is not set.

* Update main.yml

PID namespace sharing is disabled only in Kubernetes 1.7.
Explicitily enabling it by default could help reduce unexpected
results when upgrading to or downgrading from 1.7.

* Adding yaml linter to ci check

* Minor linting fixes from yamllint

* Changing CI to install python pkgs from requirements.txt

- adding in a secondary requirements.txt for tests
- moving yamllint to tests requirements

Change kubelet deploy mode to host
Enable cri and qos per cgroup for kubelet
Update CoreOS images
Add upgrade hook for switching from kubelet deployment from docker to host.
Bump machine type for ubuntu-rkt-sep

Closes #1228
pods is default enforcement

see https://kubernetes.io/docs/tasks/administer-cluster/reserve-compute-resources/
add

update

Fixes #1334

Kubelet gets copied from hyperkube container and run locally.

Canal runs more pods and upgrades need a bit of extra
room to load new pods in and get the old ones out.

This is to address out of memory issues on CI as well as help
fit deployments for people starting out with kargo on smaller
machines

Fixes #1012

- Exclude kubelet CPU/RAM (kube-reserved) from cgroup. It decreases a
  chance of overcommitment
- Add a possibility to modify Kubelet node-status-update-frequency
- Add a posibility to configure node-monitor-grace-period,
  node-monitor-period, pod-eviction-timeout for Kubernetes controller
  manager
- Add Kubernetes Relaibility Documentation with recomendations for
  various scenarios.

Signed-off-by: Sergii Golovatiuk <sgolovatiuk@mirantis.com>

Update code and docs for that assumption.

kube_apiserver_node_port_range should be accessible only
to kube-proxy and not be taken by a dynamic port allocation.

Potentially temporary if https://github.com/kubernetes/kubernetes/issues/40920
gets fixed.