Re: Cannot create role, no default superuser role exists

On 03/10/2016 05:07 PM, Robert McAlpine wrote:
> Thank you for the quick reply.
>
> I very recently had some success by doing a complete purge of
> postgresql-9.5, reinstalling and then copying in the original data
> directory (or I guess I could have just pointed to it, but w/e). I did
> not expect this to work, as I thought it would just point to the table
> holding the roles

Just to be clear Postgres-xc != Postgres. Postgres-xc is a fork of the
community Postgres. So in the below it is important to be clear when you
are talking about Postgres vs Postgres-xc.

To sort this out is going to require a step by step:

1) When did you do the apt-get install postgresql-9.5

2) When and how did install postgres-xc?

3) Do you have more then one Postgres/xc data directory. I ask because I
suspect in step 2 that it may have been installed somewhere other then
the community Postgres data directory.

4) What does ps ax|grep post give you?

>
> But to answer your questions anyways:
>
>
> Did you install postgres-xc over your existing instance?
>
> I think that is probably what happened. The reason I installed it is
> that I tried to run the command 'pg_ctl' and my box and couldn't find
> it. I had not used pg_ctl before, so I assumed it was a utility package,
> and installed it via postgres-xc.
>
>
> Which data directory, the postgres-xc one or the original Postgres one?
>
> The original.
>
>
> Installed from a package or source?
>
> From a package, specifically apt-get install postgresql-9.5
>
>
> The dump was from a pre-xc version of Postgres?
>
> No, my postgres version has not changed recently
>
>
> before or after the reinstall?
>
> After. I wanted to see if apt-get remove and then apt-get install would
> be enough of a jolt to fix the issue, as I didn't yet want to try
> apt-get purge, which would remove all my data.
>
>
>
>
>
> On Thu, Mar 10, 2016 at 7:44 PM, Adrian Klaver
> <adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>> wrote:
>
> On 03/10/2016 04:11 PM, Robert McAlpine wrote:
>
>
> Postgresql 9.5, Ubuntu 14.04.
>
> I broke my ability to access postgres after attemping to install
> postgres-xc (ironic, since I installed that to use pg_ctl to
> reload my
> pg_hba.conf without restarting the entirety of postgres).
>
>
> That is available with the stock Postgres, unless I am missing
> something:
>
> http://www.postgresql.org/docs/9.5/interactive/auth-pg-hba-conf.html
> "The pg_hba.conf file is read on start-up and when the main server
> process receives a SIGHUP signal. If you edit the file on an active
> system, you will need to signal the postmaster (using pg_ctl reload
> or kill -HUP) to make it re-read the file."
>
>
> Did you install postgres-xc over your existing instance?
>
>
> After doing so I can no longer access my databases via psql or
> any other
> utilities, getting the error:
>
> FATAL: role "postgres" does not exist
>
> Unfortunately the same error gets thrown if I attempt to use
> 'createuser'.
>
> The postgres user and role were the only ones able to access
> postgresql
> server, so altering the permissions in my pg_hba.conf also got
> me nowhere.
>
> I made a complete copy of the data directory, took a snapshot
> (it is on
>
>
> Which data directory, the postgres-xc one or the original Postgres one?
>
> a vm), then purged postgresql-9.5 and reinstalled, restoring to
> a dump
> that is a few days old. I thought about copying all the files
> from the
>
>
> Installed from a package or source?
>
> The dump was from a pre-xc version of Postgres?
>
> It would seem to me if you reinstalled in default manner you would
> have a postgres user available. So where did you get:
>
> FATAL: role "postgres" does not exist
>
> before or after the reinstall?
>
> data directory (except for the roles table file) into a fresh
> install
> with a correct default postgres role, but my gut tells me that
> screwing
> around with those files is doomed to fail.
>
>
> Yeah, I would hold off doing that until it is clearer what is going on.
>
>
> I would appreciate any help or thoughts on how to recover access
> to the
> data.
> --
> Robert McAlpine
> rem(at)pfcta(dot)com <mailto:rem(at)pfcta(dot)com> <mailto:rem(at)pfcta(dot)com
> <mailto:rem(at)pfcta(dot)com>>
>
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>
>
>
>
>
> --
> Robert McAlpine
> DevOps Engineer
> Perfecta Federal <http://www.perfectafederal.com/>
> 6506 Loisdale Road
> Springfield, VA 22150
> O: 202.888.4949 ext 1005 <tel:202.888.4949%20ext%201005>
> C: 757.620.3503 <tel:757.620.3503>
> rem(at)pfcta(dot)com <mailto:rem(at)pfcta(dot)com>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com