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adding explanation for product_uuid uniqueness (#5885)

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added steps for how to verify macaddress and product_uuid with
reference to the bug in github that identified this need originally
(https://github.com/kubernetes/kubeadm/issues/31)
This commit is contained in:
Joseph Heck
2017-10-13 15:30:11 -07:00
committed by Steve Perry
parent 7ccd827d2b
commit ccedc558b2
1 changed files with 10 additions and 0 deletions
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docs/setup/independent/install-kubeadm.md
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@@ -24,6 +24,16 @@ please see [here](https://kubernetes.io/docs/concepts/cluster-administration/net
{% capture steps %} {% capture steps %}
## Verify the MAC address and product_uuid are unique for every node
* You can get the MAC address of the network interfaces using the command `ip link` or `ifconfig -a`
* The product_uuid can be checked by using the command `sudo cat /sys/class/dmi/id/product_uuid`
It is very likely that hardware devices will have unique addresses, although some virtual machines may have
identical values. Kubernetes uses these values to uniquely identify the nodes in the cluster.
If these values are not unique to each node, the installation processes
[can fail](https://github.com/kubernetes/kubeadm/issues/31).
## Check required ports ## Check required ports
### Master node(s) ### Master node(s)