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Also adds calico-rr group if there are standalone etcd nodes. Now if there are 50 or more nodes, 3 etcd nodes will be standalone. If there are 200 or more nodes, 2 kube-masters will be standalone. If thresholds are exceeded, kube-node group cannot add nodes that belong to etcd or kube-master groups (according to above statements).
41 lines
2 KiB
Markdown
41 lines
2 KiB
Markdown
Large deployments of K8s
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For a large scaled deployments, consider the following configuration changes:
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* Tune [ansible settings](http://docs.ansible.com/ansible/intro_configuration.html)
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for `forks` and `timeout` vars to fit large numbers of nodes being deployed.
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* Override containers' `foo_image_repo` vars to point to intranet registry.
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* Override the ``download_run_once: true`` and/or ``download_localhost: true``.
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See download modes for details.
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* Adjust the `retry_stagger` global var as appropriate. It should provide sane
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load on a delegate (the first K8s master node) then retrying failed
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push or download operations.
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* Tune parameters for DNS related applications (dnsmasq daemon set, kubedns
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replication controller). Those are ``dns_replicas``, ``dns_cpu_limit``,
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``dns_cpu_requests``, ``dns_memory_limit``, ``dns_memory_requests``.
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Please note that limits must always be greater than or equal to requests.
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* Tune CPU/memory limits and requests. Those are located in roles' defaults
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and named like ``foo_memory_limit``, ``foo_memory_requests`` and
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``foo_cpu_limit``, ``foo_cpu_requests``. Note that 'Mi' memory units for K8s
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will be submitted as 'M', if applied for ``docker run``, and cpu K8s units will
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end up with the 'm' skipped for docker as well. This is required as docker does not
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understand k8s units well.
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* Add calico-rr nodes if you are deploying with Calico or Canal. Nodes recover
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from host/network interruption much quicker with calico-rr. Note that
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calico-rr role must be on a host without kube-master or kube-node role (but
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etcd role is okay).
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* Check out the
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[Inventory](https://github.com/kubernetes-incubator/kargo/blob/master/docs/getting-started.md#building-your-own-inventory)
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section of the Getting started guide for tips on creating a large scale
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Ansible inventory.
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For example, when deploying 200 nodes, you may want to run ansible with
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``--forks=50``, ``--timeout=600`` and define the ``retry_stagger: 60``.
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