On Thu, 10 Dec 2020 22:10:03 +0100
Petr Šabata <con...@redhat.com> wrote:
> Disable the freeradius module; it only has a context for the default
> perl stream and is blocking the switch.

Still no joy.  By the way, my point here is not to get this working,
but rather to demonstrate the complexity of modularity and the lack of
documentation.

Jim

$ podman run --rm -it registry.centos.org/centos:8 bash
[root@eb931d6dd4b0 /]# yum -y module disable freeradius
Failed to set locale, defaulting to C.UTF-8
CentOS-8 - AppStream                            417 kB/s | 6.2 MB     00:15    
CentOS-8 - Base                                 121 kB/s | 2.3 MB     00:19    
CentOS-8 - Extras                                24 kB/s | 8.1 kB     00:00    
Dependencies resolved.
================================================================================
 Package           Architecture     Version             Repository         Size
================================================================================
Disabling modules:
 freeradius                                                                    

Transaction Summary
================================================================================

Complete!
[root@eb931d6dd4b0 /]# yum -y module enable perl:5.30 postgresql:12 -y
Failed to set locale, defaulting to C.UTF-8
Last metadata expiration check: 0:00:57 ago on Thu Dec 10 21:51:46 2020.
Problems in request:
Modular dependency problems with Defaults:

 Problem: conflicting requests
  - module perl-libwww-perl:6.34:8030020200716155257:7cc0a66d-0.x86_64 requires 
module(perl:5.24), but none of the providers can be installed
  - module perl-libwww-perl:6.34:8030020200716155257:b967a9a2-0.x86_64 requires 
module(perl:5.26), but none of the providers can be installed
  - module perl:5.24:8010020191114034134:3af8e029-0.x86_64 conflicts with 
module(perl:5.30) provided by perl:5.30:8030020200715145239:568f3a16-0.x86_64
  - module perl:5.30:8030020200715145239:568f3a16-0.x86_64 conflicts with 
module(perl:5.24) provided by perl:5.24:8010020191114034134:3af8e029-0.x86_64
  - module perl:5.26:8000020190628020724:55190bc5-0.x86_64 conflicts with 
module(perl:5.30) provided by perl:5.30:8030020200715145239:568f3a16-0.x86_64
  - module perl:5.30:8030020200715145239:568f3a16-0.x86_64 conflicts with 
module(perl:5.26) provided by perl:5.26:8000020190628020724:55190bc5-0.x86_64
Dependencies resolved.
================================================================================
 Package           Architecture     Version             Repository         Size
================================================================================
Enabling module streams:
 perl                               5.30                                       
 postgresql                         12                                         

Transaction Summary
================================================================================

Complete!
[root@eb931d6dd4b0 /]# yum -y module install perl-DBD-Pg
Failed to set locale, defaulting to C.UTF-8
Last metadata expiration check: 0:01:04 ago on Thu Dec 10 21:51:46 2020.
Modular dependency problem:

 Problem: conflicting requests
  - module perl-libwww-perl:6.34:8030020200716155257:7cc0a66d-0.x86_64 requires 
module(perl:5.24), but none of the providers can be installed
  - module perl-libwww-perl:6.34:8030020200716155257:b967a9a2-0.x86_64 requires 
module(perl:5.26), but none of the providers can be installed
  - module perl:5.24:8010020191114034134:3af8e029-0.x86_64 conflicts with 
module(perl:5.30) provided by perl:5.30:8030020200715145239:568f3a16-0.x86_64
  - module perl:5.30:8030020200715145239:568f3a16-0.x86_64 conflicts with 
module(perl:5.24) provided by perl:5.24:8010020191114034134:3af8e029-0.x86_64
  - module perl:5.26:8000020190628020724:55190bc5-0.x86_64 conflicts with 
module(perl:5.30) provided by perl:5.30:8030020200715145239:568f3a16-0.x86_64
  - module perl:5.30:8030020200715145239:568f3a16-0.x86_64 conflicts with 
module(perl:5.26) provided by perl:5.26:8000020190628020724:55190bc5-0.x86_64
All matches for argument 'perl-DBD-Pg' in module 'perl-DBD-Pg:3.7' are not 
active
Error: Problems in request:
broken groups or modules: perl-DBD-Pg
Modular dependency problems:

 Problem: conflicting requests
  - module perl-libwww-perl:6.34:8030020200716155257:7cc0a66d-0.x86_64 requires 
module(perl:5.24), but none of the providers can be installed
  - module perl-libwww-perl:6.34:8030020200716155257:b967a9a2-0.x86_64 requires 
module(perl:5.26), but none of the providers can be installed
  - module perl:5.24:8010020191114034134:3af8e029-0.x86_64 conflicts with 
module(perl:5.30) provided by perl:5.30:8030020200715145239:568f3a16-0.x86_64
  - module perl:5.30:8030020200715145239:568f3a16-0.x86_64 conflicts with 
module(perl:5.24) provided by perl:5.24:8010020191114034134:3af8e029-0.x86_64
  - module perl:5.26:8000020190628020724:55190bc5-0.x86_64 conflicts with 
module(perl:5.30) provided by perl:5.30:8030020200715145239:568f3a16-0.x86_64
  - module perl:5.30:8030020200715145239:568f3a16-0.x86_64 conflicts with 
module(perl:5.26) provided by perl:5.26:8000020190628020724:55190bc5-0.x86_64
[root@eb931d6dd4b0 /]# 
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