Re: I suggest improving install steps for CentOS 8 - Mailing list pgsql-docs

Adding -www as this isn't a documentation issue but a website issue.

> On 14 Nov 2019, at 03:36, Yasuhiro Horimoto <horimoto@clear-code.com> wrote:
>
> Hello,
>
> I have found a problem with the following page.
>
> page: https://www.postgresql.org/download/linux/redhat/
>
> I tried install PostgreSQL12 into CentOS 8 as written on this page.
> However, I couldn't install it by the following error.
>
>
> # dnf install -y
https://download.postgresql.org/pub/repos/yum/reporpms/EL-8-x86_64/pgdg-redhat-repo-latest.noarch.rpm
> # dnf install -y postgresql12
> Failed to set locale, defaulting to C
> PostgreSQL 10 for RHEL/CentOS 8 - x8 100 kB/s | 539 kB     00:05
> PostgreSQL 11 for RHEL/CentOS 8 - x8 121 kB/s | 629 kB     00:05
> PostgreSQL 12 for RHEL/CentOS 8 - x8  91 kB/s | 471 kB     00:05
> PostgreSQL 9.4 for RHEL/CentOS 8 - x  75 kB/s | 361 kB     00:04
> PostgreSQL 9.5 for RHEL/CentOS 8 - x 108 kB/s | 425 kB     00:03
> PostgreSQL 9.6 for RHEL/CentOS 8 - x  55 kB/s | 518 kB     00:09
> No match for argument: postgresql12
> Error: Unable to find a match
>
>
> There is a workaround for this problem.
> I executed a below command.
> I could install it.
>
> # dnf module disable postgresql
>
> This problem has already reported to Red Hat Bugzilla.
> (https://bugzilla.redhat.com/show_bug.cgi?id=1718201#c1)
>
> However, this problem has been already closed.
> Because it seems that is not a bug.

Agreed, it's not a bug.

> Therefore I suggest that add a workaround in this document like an
> attachment.
>
> Thanks,
> diff --git a/templates/pages/download/linux/redhat.html b/templates/pages/download/linux/redhat.html
> index 568085a..3b0cbaf 100644
> --- a/templates/pages/download/linux/redhat.html
> +++ b/templates/pages/download/linux/redhat.html
> @@ -51,6 +51,9 @@ The PostgreSQL Yum Repository currently supports:
> <p><strong><sup>*</sup>Note</strong>: due to the shorter support cycle
> on Fedora, all supported versions of PostgreSQL are not available on this platform. We do not recommend
> using Fedora for server deployments.
> +
> +<p><strong><sup>*</sup>Note</strong>: PostgreSQL can't install in CentOS 8 or RedHat Enterprise 8 just execute the
followingsteps. 
> +We need to execute "dnf module disable postgresql" before install the client package.

This doesn't explain what the problem is, and why the above command works (or
what side effects it may have).  I don't think it's a bad idea to mention this
problem on the page but we should phrase it in such a way that it's clear what
the underlying problem is, and what the fix means.  Linking to offical RPM docs
can be a good way too?

cheers ./daniel