Hi, Thank you very much for your post. It helps me a lot.
Now I encountered a problem.
I run the following two bitcoinds:

When I try getblocktemplate,  it shows:
error code: -10
error message:
Bitcoin Core is in initial sync and waiting for blocks...

When I try miner, it shows:
HTTP request failed: The requested URL returned error: 500 Internal Server Error
[2019-10-15 14:25:53] json_rpc_call failed, retry after 30 seconds