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When I issue docker stop <id>, the process doesn't exit cleanly and bitcoind has to roll-forward blocks on the next startup.

018-03-04 04:15:25 Rolling forward 0000000000000000001728efc81b210835048a7321ba3ec93197f698fac080ab (511863)
2018-03-04 04:15:26 Rolling forward 0000000000000000002be2e2792facd65e2358f874bc48f6410b80ecc8a6e756 (511864)
2018-03-04 04:15:26 Rolling forward 0000000000000000004740c4832b47a1c852db87cf4b9aea559db8712d2971a5 (511865)

This seems to be an issue with the dbcache not being written to disk prior to exit. I'm not sure if it's issuing a SIGTERM and then SIGKILL.

What is the best way to stop bitcoind to prevent any database related issues?

  • I found this to be very useful: ctl.io/developers/blog/post/… – relik Mar 4 '18 at 5:01
  • Welcome to Bitcoin.SE! You can help the site by marking answers as accepted if they are correct and address the question so that the question does not remain as "unanswered". – Willtech Mar 4 '18 at 6:52
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Best way to stop bitcoind is either by calling the JSONRPC interface with the stop command or by issuing a SIGTERM or SIGHUP.

But it may take a couple of seconds to shut down Bitcoin Core since it eventually has to write larger amount of data (time depends on your dbcache, disk-speed, mempool size, etc.).

So the environment layer (docker in your case) must be capable to take this into account (a slow process shutdown).

  • 1
    Thanks! I think docker stop actually issues a SIGTERM, but it likely does a SIGKILL after 10 seconds, which could be the crux of the problem. Would love to vote you up, but i'm at 14 rep =\ – relik Mar 4 '18 at 4:51

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