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Document kubeadm evn variables

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Joe Beda 2016-10-17 12:30:58 -07:00
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docs/admin/kubeadm.md
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Once the cluster is up, you can grab the admin credentials from the master node at `/etc/kubernetes/admin.conf` and use that to talk to the cluster.
## Environment variables
There are some environment variables that modify the way that `kubeadm` works. Most users will have no need to set these.
| Variable | Default | Description |
| --- | --- | --- |
| `KUBE_KUBERNETES_DIR` | `/etc/kubernetes` | Where most configuration files are written to and read from |
| `KUBE_HOST_PKI_PATH` | `/etc/kubernetes/pki` | Directory for master PKI assets |
| `KUBE_HOST_ETCD_PATH` | `/var/lib/etcd` | Local etcd state for Kubernetes cluster |
| `KUBE_HYPERKUBE_IMAGE` | `` | If set, use a single hyperkube image with this name. If not set, individual images per server component will be used. |
| `KUBE_DISCOVERY_IMAGE` | `gcr.io/google_containers/kube-discovery-<arch>:1.0` | The bootstrap discovery helper image to use. |
| `KUBE_ETCD_IMAGE` | `gcr.io/google_containers/etcd-<arch>:2.2.5` | The etcd container image to use. |
| `KUBE_COMPONENT_LOGLEVEL` | `--v=4` | Logging configuration for all Kubernetes components |
## Troubleshooting
* Some users on RHEL/CentOS 7 have reported issues with traffic being routed incorrectly due to iptables being bypassed. You should ensure `net.bridge.bridge-nf-call-iptables` is set to 1 in your sysctl config, eg.