Re: FATAL: postmaster became multithreaded during startup

On Wed, 2021-12-08 at 03:53 +0000, Jose Diaz wrote:
> Greetings,
>
> I recently tried to create a Rails app and when I tried to create the
> database I got the following error message:
>
> PG::ConnectionBad: could not connect to server: Connection refused
>         Is the server running on host "localhost" (::1) and accepting
>         TCP/IP connections on port 5432?
> could not connect to server: Connection refused
>         Is the server running on host "localhost" (127.0.0.1) and
> accepting
>         TCP/IP connections on port 5432?
>
> After some checking on my computer and remembering a problem I had
> when I tried to use PGadmin last week I realized there was an error
> in the database. 
>
> After some research on the internet, I found that there was an error
> message on my log for the database that says:
>
> FATAL:  postmaster became multithreaded during startup
> HINT:  Set the LC_ALL environment variable to a valid
>
> The output from my locale was
>
> LANG="en_US.UTF-8"
> LC_COLLATE="en_US.UTF-8"
> LC_CTYPE="en_US.UTF-8"
> LC_MESSAGES="en_US.UTF-8"
> LC_MONETARY="en_US.UTF-8"
> LC_NUMERIC="en_US.UTF-8"
> LC_TIME="en_US.UTF-8"
> LC_ALL="en_US.UTF-8"
>
> despite that, I tried the following commands to set up my local
> anyways
>
> export LC_ALL=en_US.UTF-8
> export LANG=en_US.UTF-8
>
> No success.
>
> I added the following commands to both, my .bash_profile and .profile
> files 
>
> export LC_ALL="en_US.UTF-8"
> export LANG="en_US.UTF-8"
>
> No success.
>
> I changed the language configuration of my mac to English, I set
> locale environment variables on startup on the terminal and added the
> following command to my .zshrc file 
>
> export LC_ALL=en_US.UTF-8
> export LANG=en_US.UTF-8
>
> Still no success.
>
> I really don't know what's going on. I haven't changed any
> configuration. I had a previous version of PostgreSQL, but I didn't
> know which version I had. I updated it to version 13 as a possible
> solution found on the internet but still the same error. 
>
> Before this, it worked normally. It is the first I touch these
> settings because I seldom work on databases. I hope I provided enough
> info, this is as much detailed I can currently get. I thank you in
> advance for your assistance.

https://github.com/PostgresApp/PostgresApp/issues/317#issuecomment-251786830

indicates that the locale values need to be set properly for the
postgres user.