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Updates HA etcd with kubeadm (#9227) 

Adds a missing instruction on how to configure the kubelet. Reported in slack in the #kubeadm channel.

Fixes #9222

Signed-off-by: Chuck Ha <ha.chuck@gmail.com>
pull/9375/head
Chuck Ha 2018-07-03 10:37:21 -04:00 committed by k8s-ci-robot
parent e342dd50bf
commit 429d01e95b
1 changed files with 29 additions and 5 deletions
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34
content/en/docs/tasks/administer-cluster/setup-ha-etcd-with-kubeadm.md
View File

@ -22,9 +22,10 @@ when using kubeadm to set up a kubernetes cluster.
document assumes these default ports. However, they are configurable through
the kubeadm config file.
* Each host must [have docker, kubelet, and kubeadm installed][toolbox].
* Some infrastructure to copy files between hosts (e.g., ssh).
* Some infrastructure to copy files between hosts. For example `ssh` and `scp`
can satisfy this requirement.
[toolbox]: /docs/setup/independent/install-kubeadm/
[toolbox]: /docs/tasks/tools/install-kubeadm/
{{% /capture %}}
@ -33,9 +34,32 @@ when using kubeadm to set up a kubernetes cluster.
## Setting up the cluster
The general approach is to generate all certs on one node and only distribute
the *necessary* files to the other nodes. Note that kubeadm contains all the
necessary crytographic machinery to generate the certificates described below;
no other cryptographic tooling is required for this example.
the *necessary* files to the other nodes.
{{< note >}}
**Note:** kubeadm contains all the necessary crytographic machinery to generate
the certificates described below; no other cryptographic tooling is required for
this example.
{{< /note >}}
1. Configure the kubelet to be a service manager for etcd.
Running etcd is simpler than running kubernetes so you must override the
kubeadm-provided kubelet unit file by creating a new one with a higher
precedence.
```sh
cat << EOF > /etc/systemd/system/kubelet.service.d/20-etcd-service-manager.conf
[Service]
ExecStart=
ExecStart=/usr/bin/kubelet --pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true
Restart=always
EOF
systemctl daemon-reload
systemctl restart kubelet
```
1. Create configuration files for kubeadm.