On 11/3/22 18:50, Bryn Llewellyn wrote:
adrian.kla...@aklaver.com <mailto:adrian.kla...@aklaver.com> wrote:
It isn't you where using pg_ctl and in the Debian/Ubuntu packaging the
better option for that is pg_ctlcluster. I generally use the systemd
scripts to start/stop Postgres instances, though when I do
pg_lsclusters I tend to fall into using pg_ctlcluster as the cluster
info is right there.
Can't parse this. Sorry.
Short version, use what works for you.
Fair enough. I started again from the state where my "config_file", my
"hba_file", and my "ident_file" are all customized as I want them to be
but where I hadn't yet tried to trash my cluster and re-create it. Then
I tried with "pg_dropcluster --stop" and "pg_createcluster". I
discovered immediately that this approach (in contrast to the "initdb"
initdb will not work on an directory with existing files, so this:
sudo -u postgres initdb \
-U postgres --encoding UTF8 --locale=C --lc-collate=C
--lc-ctype=en_US.UTF-8 \
-A md5 --pwfile=my_password_file \
-D /var/lib/postgresql/11/main
Will only work if /var/lib/postgresql/11/main is empty, so none of your
customized files will be there. You will have to copy them in just as
you do below.
As example:
postgres@maura:/usr/local/pgsql15> bin/initdb -D data/
The files belonging to this database system will be owned by user
"postgres".
This user must also own the server process.
The database cluster will be initialized with locale "en_US.UTF-8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".
Data page checksums are disabled.
initdb: error: directory "data" exists but is not empty
initdb: hint: If you want to create a new database system, either remove
or empty the directory "data" or run initdb with an argument other than
"data".
FYI, you might want to take a look at the the includes mechanism:
https://www.postgresql.org/docs/15/config-setting.html#CONFIG-SETTING-CONFIGURATION-FILE
approach) blows away all the *.conf files and recreates them in
canonical form—just as the "man" page says. This is a bit of a nuisance.
But it's negotiable. I installed my files as I want them in a safe
place, outside of the entire PG world, and then used this script:
sudo pg_dropcluster --stop 11 main
sudo pg_createcluster 11 main \
-e UTF8 --locale=C --lc-collate=C --lc-ctype=en_US.UTF-8 \
-d /var/lib/postgresql/11/main \
> /dev/null
sudo cp /etc/ybmt-code/pg-and-yb-config-files/*.conf \
/etc/postgresql/11/main
sudo chown postgres /etc/postgresql/11/main/*.conf
sudo chgrp postgres /etc/postgresql/11/main/*.conf
sudo chmod 644 /etc/postgresql/11/main/*.conf
sudo chmod 640 /etc/postgresql/11/main/pg_hba.conf
sudo chmod 640 /etc/postgresql/11/main/pg_ident.conf
sudo pg_ctlcluster start 11/main
sudo -u postgres psql -c " select name, setting from pg_settings where
category = 'File Locations'; "
sudo -u postgres psql -f
/etc/ybmt-code/cluster-mgmt/01-initialize-brand-new-YB-or-PG-clstr/00.sql
It worked without error and had the intended effect. My old approach
with the uncommitted chicken used to take ~3 sec. This new approach
takes ~5 sec. The difference is completely unimportant.
For various reasons, I need the non-standard "--lc-collate=C" choice. I
could doubtless leave all the other options unspecified. But that's the
style discussion we had the other day—and I prefer, here, to self-doc my
choices.
I discovered that using, say, the "initdb" approach, then the "kosher"
approach, and then the "initdb" approach brought all sorts of errors.
That's the beauty of using a VM and file backups (or snapshots). I
suppose this is to be expected.
Hence commitment instead of involvement.
*Can I declare victory, now, with the approach that I showed above?*
You are setting the goals not us, that is your decision.
p.s. Is my pessimism justified—that there simply exists no plain English
user guide for this whole Debian/Ubuntu apparatus—correct. Or is it,
rather, that my search skills are just too feeble?
Not that I know of.
--
Adrian Klaver
adrian.kla...@aklaver.com
