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Update docs to show Digital Ocean with on-host etcd

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Dalton Hubble 2017-10-09 23:47:32 -07:00
parent 308c7dfb6e
commit a5290dac32
2 changed files with 5 additions and 8 deletions
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docs/digital-ocean.md
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@ -4,7 +4,7 @@ In this tutorial, we'll create a Kubernetes v1.7.7 cluster on Digital Ocean.
We'll declare a Kubernetes cluster in Terraform using the Typhoon Terraform module. On apply, firewall rules, DNS records, tags, and droplets for Kubernetes controllers and workers will be created.
Controllers and workers are provisioned to run a `kubelet`. A one-time [bootkube](https://github.com/kubernetes-incubator/bootkube) bootstrap schedules `etcd`, `apiserver`, `scheduler`, `controller-manager`, and `kube-dns` on controllers and runs `kube-proxy` and `flannel` on each node. A generated `kubeconfig` provides `kubectl` access to the cluster.
Controllers and workers are provisioned to run a `kubelet`. A one-time [bootkube](https://github.com/kubernetes-incubator/bootkube) bootstrap schedules an `apiserver`, `scheduler`, `controller-manager`, and `kube-dns` on controllers and runs `kube-proxy` and `flannel` on each node. A generated `kubeconfig` provides `kubectl` access to the cluster.
## Requirements
@ -137,7 +137,7 @@ module.digital-ocean-nemo.null_resource.bootkube-start: Creation complete (ID: 7
Apply complete! Resources: 54 added, 0 changed, 0 destroyed.
```
In 5-10 minutes, the Kubernetes cluster will be ready.
In 3-6 minutes, the Kubernetes cluster will be ready.
## Verify
@ -156,13 +156,10 @@ List the pods.
```
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system etcd-operator-3329263108-sgsbl 1/1 Running 1 11m
kube-system kube-apiserver-n10qr 1/1 Running 0 11m
kube-system kube-controller-manager-3271970485-37gtw 1/1 Running 1 11m
kube-system kube-controller-manager-3271970485-p52t5 1/1 Running 0 11m
kube-system kube-dns-1187388186-ld1j7 3/3 Running 0 11m
kube-system kube-etcd-0000 1/1 Running 0 9m
kube-system kube-etcd-network-checkpointer-n9xsk 1/1 Running 0 11m
kube-system kube-flannel-1cq1v 2/2 Running 0 11m
kube-system kube-flannel-hq9t0 2/2 Running 1 11m
kube-system kube-flannel-v0g9w 2/2 Running 0 11m

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docs/faq.md
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@ -8,12 +8,12 @@ Formats rise and evolve. Typhoon may choose to adapt the format over time (with
## Self-hosted etcd
Typhoon clusters on cloud providers run etcd as "self-hosted" pods, managed by the [etcd-operator](https://github.com/coreos/etcd-operator). By contrast, Typhoon bare-metal runs an etcd peer as a systemd `etcd-member.service` on each controller (i.e. on-host).
AWS and Google Cloud clusters run etcd as "self-hosted" pods, managed by the [etcd-operator](https://github.com/coreos/etcd-operator). By contrast, Typhoon bare-metal and Digital Ocean run an etcd peer as a systemd `etcd-member.service` on each controller (i.e. on-host).
In practice, self-hosted etcd has proven to be *ok*, but not ideal. Running the apiserver's etcd atop Kubernetes itself is inherently complex, but works suitably in most cases. It can be opaque to debug if complex edge cases with upstream Kubernetes bugs arise.
In practice, self-hosted etcd has proven to be *ok*, but not ideal. Running the apiserver's etcd atop Kubernetes itself is inherently complex, but works in most cases. It can be opaque to debug if complex edge cases with upstream Kubernetes bugs arise.
!!! note ""
Typhoon clusters and their defaults power the maintainers' clusters. The edge cases are sufficiently rare that self-hosted etcd is not a pressing issue, but cloud clusters may switch back to on-host etcd in the future.
Over time, we plan to deprecate self-hosted etcd and revert to running etcd on-host.
## Operating Systems