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Diffstat (limited to 'docs/usecases/contiv/CUSTOM_MGMT_NETWORK.rst')
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diff --git a/docs/usecases/contiv/CUSTOM_MGMT_NETWORK.rst b/docs/usecases/contiv/CUSTOM_MGMT_NETWORK.rst new file mode 100644 index 00000000000..b8cf2e6dd86 --- /dev/null +++ b/docs/usecases/contiv/CUSTOM_MGMT_NETWORK.rst @@ -0,0 +1,36 @@ +Setting Up a Custom Management Network on Multi-Homed Nodes +=========================================================== + +If the interface you use for Kubernetes management traffic (for example, +the IP address used for ``kubeadm join``) is not the one that contains +the default route out of the host, then you need to specify the +management node IP address in the Kubelet config file. Add the following +line to: (``/etc/systemd/system/kubelet.service.d/10-kubeadm.conf``): + +:: + + Environment="KUBELET_EXTRA_ARGS=--fail-swap-on=false --node-ip=<node-management-ip-address>" + +Example +------- + +Consider a 2 node deployment where each node is connected to 2 networks +- ``10.0.2.0/24`` and ``192.168.56.0/24``, and the default route on each +node points to the interface connected to the ``10.0.2.0/24`` subnet. We +want to use subnet ``192.168.56.0/24`` for Kubernetes management +traffic. Assume the addresses of nodes connected to ``192.168.56.0/24`` +are ``192.168.56.105`` and ``192.168.56.106``. + +On the ``192.168.56.105`` node you add the following line to +``10-kubeadm.conf``: + +:: + + Environment="KUBELET_EXTRA_ARGS=--fail-swap-on=false --node-ip=192.168.56.105" + +On the ``192.168.56.106`` node you add the following line to +``10-kubeadm.conf``: + +:: + + Environment="KUBELET_EXTRA_ARGS=--fail-swap-on=false --node-ip=192.168.56.106" |