Significantly reduce memory requirements

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

roles/kubernetes/master/defaults/main.yml

@@ -19,7 +19,7 @@ kube_apiserver_storage_backend: etcd3
 # Limits for kube components
 kube_controller_memory_limit: 512M
 kube_controller_cpu_limit: 250m
-kube_controller_memory_requests: 170M
+kube_controller_memory_requests: 100M
 kube_controller_cpu_requests: 100m
 kube_controller_node_monitor_grace_period: 40s
 kube_controller_node_monitor_period: 5s
@@ -27,11 +27,11 @@ kube_controller_pod_eviction_timeout: 5m0s
 kube_scheduler_memory_limit: 512M
 kube_scheduler_cpu_limit: 250m
 kube_scheduler_memory_requests: 170M
-kube_scheduler_cpu_requests: 100m
+kube_scheduler_cpu_requests: 80m
 kube_apiserver_memory_limit: 2000M
 kube_apiserver_cpu_limit: 800m
 kube_apiserver_memory_requests: 256M
-kube_apiserver_cpu_requests: 300m
+kube_apiserver_cpu_requests: 100m
 
 
 ## Enable/Disable Kube API Server Authentication Methods

roles/kubernetes/master/tasks/pre-upgrade.yml

@@ -38,7 +38,7 @@
   environment:
     ETCDCTL_API: 2
   register: old_data_exists
-  delegate_to: "{{groups['kube-master'][0]}}"
+  delegate_to: "{{groups['etcd'][0]}}"
   when: kube_apiserver_storage_backend == "etcd3"
   failed_when: false
 

roles/kubernetes/node/defaults/main.yml

@@ -21,7 +21,7 @@ kube_proxy_cpu_requests: 150m
 nginx_memory_limit: 512M
 nginx_cpu_limit: 300m
 nginx_memory_requests: 32M
-nginx_cpu_requests: 50m
+nginx_cpu_requests: 25m
 
 # kube_api_runtime_config:
 #   - extensions/v1beta1/daemonsets=true