Create a pre-flight script that runs through the prerequisites to verify a cluster

Will need script to check for the following:

• metrics API endpoint (v1beta1.metrics.k8s.io endpoint)
• Existing StorageClass
• SELinux checking/evaluating (eg if SELinux enabled on nodes? Possibly recommending other scripts/configs/items as a result)
• loadbalancer cloud support or deployment (eg: servicelb, metallb, others?)

added BB-Air-Gap label

added to epic &32 (closed)

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This would be useful to identify if the distro had a metrics server

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To be thorough, need to go through docs in https://repo1.dso.mil/platform-one/big-bang/bigbang/-/tree/master/docs/guides/prerequisites and see if there additional things to check. Off the top of my head, I know there are a couple of sysctl commands for max file descriptors and vm memory in there somewhere that have to be set for some of our addons. I'd also check for hard drive space.

If we fail a precheck related to something like Elasticsearch, we need to explicitly state the prereq is for that app so the user has the option of ignoring the failure if they don't plan to deploy it.

assigned to @sameerbhatia

This feature is already incorporated into BB CLI to check for pre-requisite items. Closing issue.

closed

mentioned in merge request big-bang/product/packages/bbctl!111 (merged)