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39 lines
2.0 KiB
Plaintext
39 lines
2.0 KiB
Plaintext
// Module included in the following assemblies:
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//
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// * microshift_networking/microshift-disconnected-network-config.adoc
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:_mod-docs-content-type: CONCEPT
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[id="microshift-disconnected-host-preparation_{context}"]
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= Preparing networking for fully disconnected hosts
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Use the procedure that follows to start and run {microshift-short} clusters on devices running fully disconnected operating systems. A {microshift-short} host is considered fully disconnected if it has no external network connectivity.
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Typically this means that the device does not have an attached network interface controller (NIC) to provide a subnet. These steps can also be completed on a host with a NIC that is removed after setup. You can also automate these steps on a host that does not have a NIC by using the `%post` phase of a Kickstart file.
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[IMPORTANT]
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====
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Configuring networking settings for disconnected environments is necessary because {microshift-short} requires a network device to support cluster communication. To meet this requirement, you must configure {microshift-short} networking settings to use the "fake" IP address you assign to the system loopback device during setup.
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====
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[id="microshift-disconnected-host-procedure-summary_{context}"]
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== Procedure summary
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To run {microshift-short} on a disconnected host, the following steps are required:
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Prepare the host::
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* Stop {microshift-short} if it is currently running and clean up changes the service has made to the network.
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* Set a persistent hostname.
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* Add a “fake” IP address on the loopback interface.
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* Configure DNS to use the fake IP as local name server.
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* Add an entry for the hostname to `/etc/hosts`.
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Update the {microshift-short} configuration::
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* Define the `nodeIP` parameter as the new loopback IP address.
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* Set the `.node.hostnameOverride` parameter to the persistent hostname.
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For the changes to take effect::
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* Disable the default NIC if attached.
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* Restart the host or device.
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After starting, {microshift-short} runs using the loopback device for within-cluster communication.
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