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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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5
roles/kubernetes/node/templates/kubelet.j2
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@@ -9,7 +9,10 @@ KUBELET_ADDRESS="--address={{ ip | default("0.0.0.0") }}"
KUBELET_HOSTNAME="--hostname-override={{ ansible_hostname }}"
{# Base kubelet args #}
{% set kubelet_args_base %}--pod-manifest-path={{ kube_manifest_dir }} --pod-infra-container-image={{ pod_infra_image_repo }}:{{ pod_infra_image_tag }}{% endset %}
{% set kubelet_args_base %}--pod-manifest-path={{ kube_manifest_dir }} \
--pod-infra-container-image={{ pod_infra_image_repo }}:{{ pod_infra_image_tag }} \
--kube-reserved cpu={{ kubelet_cpu_limit }},memory={{ kubelet_memory_limit|regex_replace('Mi', 'M') }} \
--node-status-update-frequency={{ kubelet_status_update_frequency }}{% endset %}
{# DNS settings for kubelet #}
{% if dns_mode == 'kubedns' %}