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Kubernetes Reliability Improvements

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- 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>
This commit is contained in:
Sergii Golovatiuk
2017-02-07 15:01:02 +01:00
parent ef10ce04e2
commit c07d60bc90
6 changed files with 126 additions and 6 deletions
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3
roles/kubernetes/master/defaults/main.yml
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@@ -18,6 +18,9 @@ kube_controller_memory_limit: 512M
kube_controller_cpu_limit: 250m
kube_controller_memory_requests: 170M
kube_controller_cpu_requests: 100m
kube_controller_node_monitor_grace_period: 40s
kube_controller_node_monitor_period: 5s
kube_controller_pod_eviction_timeout: 5m0s
kube_scheduler_memory_limit: 512M
kube_scheduler_cpu_limit: 250m
kube_scheduler_memory_requests: 170M

3
roles/kubernetes/master/templates/manifests/kube-controller-manager.manifest.j2
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@@ -28,6 +28,9 @@ spec:
- --cluster-signing-cert-file={{ kube_cert_dir }}/ca.pem
- --cluster-signing-key-file={{ kube_cert_dir }}/ca-key.pem
- --enable-hostpath-provisioner={{ kube_hostpath_dynamic_provisioner }}
- --node-monitor-grace-period={{ kube_controller_node_monitor_grace_period }}
- --node-monitor-period={{ kube_controller_node_monitor_period }}
- --pod-eviction-timeout={{ kube_controller_pod_eviction_timeout }}
- --v={{ kube_log_level }}
{% if cloud_provider is defined and cloud_provider in ["openstack", "azure"] %}
- --cloud-provider={{cloud_provider}}