Systemd units, limits, and bin path fixes

* Add restart for weave service unit
* Reuse docker_bin_dir everythere
* Limit systemd managed docker containers by CPU/RAM. Do not configure native
  systemd limits due to the lack of consensus in the kernel community
  requires out-of-tree kernel patches.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

roles/kubernetes/master/defaults/main.yml

@@ -13,4 +13,16 @@ kube_apiserver_node_port_range: "30000-32767"
 etcd_config_dir: /etc/ssl/etcd
 etcd_cert_dir: "{{ etcd_config_dir }}/ssl"
 
-
+# Limits for kube components
+kube_controller_memory_limit: 512M
+kube_controller_cpu_limit: 250m
+kube_controller_memory_requests: 170M
+kube_controller_cpu_requests: 100m
+kube_scheduler_memory_limit: 512M
+kube_scheduler_cpu_limit: 250m
+kube_scheduler_memory_requests: 170M
+kube_scheduler_cpu_requests: 100m
+kube_apiserver_memory_limit: 2000M
+kube_apiserver_cpu_limit: 800m
+kube_apiserver_memory_requests: 256M
+kube_apiserver_cpu_requests: 300m

roles/kubernetes/master/tasks/main.yml

@@ -3,7 +3,7 @@
   tags: k8s-pre-upgrade
 
 - name: Copy kubectl from hyperkube container
-  command: "/usr/bin/docker run --rm -v {{ bin_dir }}:/systembindir {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }} /bin/cp /hyperkube /systembindir/kubectl"
+  command: "{{ docker_bin_dir }}/docker run --rm -v {{ bin_dir }}:/systembindir {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }} /bin/cp /hyperkube /systembindir/kubectl"
   register: kube_task_result
   until: kube_task_result.rc == 0
   retries: 4

roles/kubernetes/master/templates/manifests/kube-apiserver.manifest.j2

@@ -12,6 +12,13 @@ spec:
   - name: kube-apiserver
     image: {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }}
     imagePullPolicy: {{ k8s_image_pull_policy }}
+    resources:
+      limits:
+        cpu: {{ kube_apiserver_cpu_limit }}
+        memory: {{ kube_apiserver_memory_limit }}
+      requests:
+        cpu: {{ kube_apiserver_cpu_requests }}
+        memory: {{ kube_apiserver_memory_requests }}
     command:
     - /hyperkube
     - apiserver

roles/kubernetes/master/templates/manifests/kube-controller-manager.manifest.j2

@@ -11,6 +11,13 @@ spec:
   - name: kube-controller-manager
     image: {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }}
     imagePullPolicy: {{ k8s_image_pull_policy }}
+    resources:
+      limits:
+        cpu: {{ kube_controller_cpu_limit }}
+        memory: {{ kube_controller_memory_limit }}
+      requests:
+        cpu: {{ kube_controller_cpu_requests }}
+        memory: {{ kube_controller_memory_requests }}
     command:
     - /hyperkube
     - controller-manager

roles/kubernetes/master/templates/manifests/kube-scheduler.manifest.j2

@@ -11,6 +11,13 @@ spec:
   - name: kube-scheduler
     image: {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }}
     imagePullPolicy: {{ k8s_image_pull_policy }}
+    resources:
+      limits:
+        cpu: {{ kube_scheduler_cpu_limit }}
+        memory: {{ kube_scheduler_memory_limit }}
+      requests:
+        cpu: {{ kube_scheduler_cpu_requests }}
+        memory: {{ kube_scheduler_memory_requests }}
     command:
     - /hyperkube
     - scheduler