Under Consideration: Migrate the Forums to Discourse Post: 303045094

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The Lounge What is on Your Mind? Under Consideration: Migrate the Forums to Discourse Post 303045094 by Neo on Wednesday 11th of March 2020 09:28:40 PM

03-11-2020

Administrator

Quote:

Originally Posted by sea

Never play on a patch day.
Issue is, when you're the one doing the patch.. Smilie

LOL.

Yesterday was a migration test disaster.

First of all, the Discourse team seems to attempt to bully me to do an impossible upgrade from vB3 to vB4, an upgrade which does not exist and is not available. LOL.

Then, when I explained that to them, they shut me down, shut down a bug report, and decided to ignore us completely.

It was a very strange day, for sure.

Then, working on trying to fine tune the migration by making manual search and replace changes to the test migration postgres database, raking the db (which means basically cooking a million plus posts from raw format to final format) the postgres db crashed.

The worse part was each search and replace in a docker discourse app took 30 minutes to an hour, and I had to do at around 10 of these search and replace db operations, so that took the whole and and then, afterward, to have the entire discourse rake process crash, well..... it was a very bad day all around.

However, I think I will start from scratch, ground zero today, with test migration 2.

However, this time I will do more intensive modifications to the vbulletin.rb migration script (my original plan) versus manually doing search and replaces in the discourse database (suggested by someone, so I thought I would try it), and start from scratch.

In addition, I will not post any bug reports on the meta discourse site or interact with any "migration experts", as that has not worked out either (trying to be sociable and "collaborative" has not yielded any fruit at all) and just leads to unnecessary social conflicts with "discourse experts", which are totally distracting from the task and have been, at best, unproductive.

Smilie

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LEARN ABOUT DEBIAN

vzmigrate

vzmigrate(8)							    Containers							      vzmigrate(8)

NAME

       vzmigrate - migrate a container between two OpenVZ servers

SYNOPSIS

       vzmigrate [-r|--remove-area yes|no] [--ssh=ssh_options] [--rsync=rsync_options] [--keep-dst] [--online] [-v] destination_address CTID

DESCRIPTION

       This  utility  is  used	to  migrate  a container from one (source) Hardware Node (HN) to another (destination) HN. The utility can migrate
       either stopped or running container. For a stopped container, simple CT private area transfer is  performed  (rsync(1)  is  used  for  file
       transfer). For running containers, migration may be offline (default) or online.

       This  program uses ssh as a transport layer. You will need to put ssh public key to destination node and be able to connect to node without
       entering password.

OPTIONS

       -r, --remove-area yes | no
	      Whether to remove a container area on source HN for the successfully migrated container. Default is yes.

       --ssh=options
	      Additional options that will be passed to ssh while establishing connection to destination HN.

       --rsync=options
	      Additional options that will be passed to rsync(8).  You may add options like -z to enable data compression  if  you  are  migrating
	      over a slow link.

       --keep-dst
	      Do  not  clean  synced  destination container private area in case of some error. It makes sense to use this option on big container
	      migration to avoid syncing container private area again in case some error (on container	stop  for  example)  occurs  during  first
	      migration attempt.

       --online
	      Perform  online (zero-downtime) migration: during the migration the container hangs for a while and after the migration it continues
	      working as though nothing has happened.

       -v     Verbose mode. Causes vzmigrate to print debugging messages about its progress.  Multiple -v options  increase  the  verbosity.   The
	      maximum is 3.

EXAMPLES

       Migration of CT 101 to 192.168.1.130 with downtime:

	  vzmigrate 192.168.1.130 101

       Online migration of CT 102 to 192.168.1.130:

	  vzmigrate --online 192.168.1.130 102

EXIT STATUS

       0 EXIT_OK
	      Command completed successfully.

       1 EXIT_USAGE
	      Bad command line options.

       2 EXIT_VE_STOPPED
	      Container is stopped.

       4 EXIT_CONNECT
	      Can't connect to destination (source) HN.

       6 EXIT_COPY
	      Container private area copying/moving failed.

       7 EXIT_VE_START
	      Can't start or restore destination CT.

       8 EXIT_VE_STOP
	      Can't stop or checkpoint source CT.

       9 EXIT_EXISTS
	      Container already exists on destination HN.

       10 EXIT_NOTEXIST
	      Container does not exists on source HN.

       12 EXIT_IP_INUSE
	      You attempt to migrate CT which IP address(es) are already in use on the destination node.

       13 EXIT_QUOTA
	      Operation with CT quota failed.

SEE ALSO

       rsync(1).

COPYRIGHT

       Copyright (C) 2001-2010, Parallels, Inc. Licensed under GNU GPL.

OpenVZ								    28 Jun 2011 						      vzmigrate(8)