Configure DHCP

This scsctl initialization step builds a custom configuration file for DHCP and restarts the service using the pattern determined in https://perifery.atlassian.net/wiki/spaces/public/pages/2840461313 for the site. Changes in the configuration file specifies the pool and ranges which DHCP is to manage, as well as other DHCP response data to be used with PXE booting storage nodes.

The Swarm network requires an upper or lower (or both) reserved range defined to configure DHCP. At least one of these parameters must be provided.

`--dhcp-reserve-lower DHCP_RESERVE_LOWER`	The number of IP addresses to reserve in the lower subnet range (default is 0).
`--dhcp-reserve-upper DHCP_RESERVE_UPPER`	The number of IP addresses to reserve in the upper subnet range (default is 0).

For example, set the DHCP reserve lower range.

scsctl init dhcp --dhcp-reserve-lower 30

Info

The configuration values used for DHCP reserve lower or upper range always come from the network planning.

See https://perifery.atlassian.net/wiki/spaces/public/pages/1223491667/SCS+Administration#Swarm-(Internal)-Network-MTU to configure the MTU value that DHCP serves to storage nodes.

See https://perifery.atlassian.net/wiki/spaces/public/pages/1223491667/SCS+Administration#Swarm-(Internal)-Network-Gateway to configure the network gateway that DHCP serves to storage nodes.

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