NAME

App::bwk::mn - Some commands to manage Bulwark masternode

VERSION

This document describes version 0.001 of App::bwk::mn (from Perl distribution App-bwk-mn), released on 2019-07-22.

SYNOPSIS

Please see included script bwk-mn.

FUNCTIONS

new_zfs_snapshot

Usage:

 new_zfs_snapshot() -> [status, msg, payload, meta]

Create a new ZFS snapshot.

This subcommand will:

1. stop bulwarkd
2. create a new ZFS snapshot
3. restart bulwarkd again

See restore_from_zfs_snapshot for more details.

This function is not exported.

No arguments.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

restore_from_zfs_snapshot

Usage:

 restore_from_zfs_snapshot() -> [status, msg, payload, meta]

Restore broken installation from ZFS snapshot.

This subcommand will:

1. stop bulwarkd
2. rollback to a specific ZFS snapshot
3. restart bulwarkd again
4. wait until node is fully sync-ed (not yet implemented)

For this to work, a specific setup is required. First, at least the blocks/ and chainstate directory are put in a ZFS filesystem (this part is assumed and not checked) and a snapshot of that filesytem has been made. The ZFS filesystem needs to have "bulwark" or "bwk" as part of its name, and the snapshot must be named using YYYY-MM-DD. The most recent snapshot will be selected.

Rationale: as of this writing (2019-07-22, Bulwark version 2.2.0.0) a Bulwark masternode still from time to time gets corrupted with this message in the debug.log:

 2019-07-22 02:30:17 ERROR: VerifyDB() : *** irrecoverable inconsistency in block data at xxxxxx, hash=xxxxxxxx

(It used to happen more often prior to 2.1.0 release, and less but still happens from time to time since 2.1.0.)

Resync-ing from scratch will take at least 1-2 hours, and if this happens on each masternode every few days then resync-ing will waste a lot of time. Thus the ZFS snapshot. Snapshots will of course need to be created regularly for this setup to benefit.

This function is not exported.

No arguments.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

status

Usage:

 status() -> [status, msg, payload, meta]

bulwark-cli getblockcount + masternode status.

This is mostly just a shortcut for running bulwark-cli getblockcount and bulwark-cli masternode status.

This function is not exported.

No arguments.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/App-bwk-mn.

SOURCE

Source repository is at https://github.com/perlancar/perl-App-bwk-mn.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=App-bwk-mn

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

SEE ALSO

cryp-mn from App::cryp::mn

Other App::cryp::* modules.

AUTHOR

perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2019 by perlancar@cpan.org.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.