Cron updates to support running multiple instances on a Kubernetes cluster #484
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…loyment Support pre-cronjob hooks to enable running cronjobs conditionally (such as on the 0th pod of a Kubernetes statefulset).
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This change implements a series of features designed to support running this container in a distributed manner where multiple instances are running to support a single instance of LibreNMS, including:
DISABLE_DB_MIGRATEandDISABLE_CRONenvironment variable flags that may be used to disable automatic database migration as well as running cron such that these features can be run as separate Kubernetes jobs if desired./data/cron-pre-hookinto the shell environment if present prior to cronjob execution. This can be leveraged in combination with the leader-elector Kubernetes or a simple test of the index of the pod in a statefulset in order to ensure that only one container is running the cronjobs.