You don't need to run the perl script if you installed using extensions. The perl script is only needed if you used what I called "Old Fashioned using scripts".
That said your steps are fine. You don't need to do not need to go to 2.5.5 in old before going to 3.0 in new. One other consideration: If you are using PostGIS raster, you will need to create your new database first and then do CREATE EXTENSION postgis; SCHEMA <same schema as you have installed your 9.6>; CREATE EXTENSION postgis_raster SCHEMA <same schema as you have installed your 9.6>; Otherwise your raster tables will not load. I'll work on clarifying the instructions in the docs, but if you can think of a better way of describing it, feel free to provide a patch to the docs. Hope that helps, Regina From: postgis-users [mailto:postgis-users-boun...@lists.osgeo.org] On Behalf Of Reismann, Martin Sent: Wednesday, September 30, 2020 8:56 AM To: postgis-users@lists.osgeo.org Subject: [postgis-users] Moving from Postgis 2.5.5 to Postgis 3.0 Hello, I am planning to move from Postgis 2.5.5 (on PostgreSQL 9.6) to Postgis 3.0 (on PostgreSQL 13). I refer to http://www.postgis.net/docs/postgis_installation.html#hard_upgrade Can I proceed as follows (HARD UPGRADE) ? - pg_dump database(s) in old system - install Postgis 3.0 packages on operating system level - initialization of new database, start the new server, import of users and groups ... - restore database(s) in new system (using the perl script given in the link above) - ALTER EXTENSION postgis UPDATE TO "3.0.2"; # in new system OR Is it still necessary to do an in-place SOFT UPGRADE (ALTER EXTENSION postgis UPDATE ...) of Postgis 2.5.5 to 3.0 BEFORE starting the procedure above ? There is an older docment which mentions this: https://postgis.net/workshops/postgis-intro/upgrades.html#:~:text=34.2.-,Upg rading%20PostGIS,is%20available%20to%20the%20database. "Install the new version of PostgreSQL and the same version of PostGIS you are using in your old database. You need to match the PostGIS version so that the dump file function definitions reference an expected version of the PostGIS library." Regards, Martin Reismann
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