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I am trying to bring up a postgres server where the configuration files and the data are in separate places/partitions

postgresql-10 has been installed using the official repository using YUM in Centos 7

And it has been initialised using

/usr/pgsql-10/bin/pg_ctl initdb --pgdata=/var/lib/pgsql/10/data

as user app

What is referenced as PGDATA (configuration) directory is the default one:

# ls -salt /var/lib/pgsql/10/data
total 120
 4 drwxrwxr-x. 19 app app  4096 Nov 10 17:29 .

I would like to use the following directory for data storage:

# ls -salt /usr/ip-spotlight/postgresql/
total 12
4 drwxrwxr-x. 3 postgres  postgres  4096 Nov 10 17:43 .
4 drwx------. 2 postgres  postgres  4096 Nov 10 17:43 data

And it complains about:

2017-11-10 17:51:44.495 CET [81743] FATAL:  "/usr/ip-spotlight/postgresql/data" is not a valid data directory
2017-11-10 17:51:44.495 CET [81743] DETAIL:  File "/usr/ip-spotlight/postgresql/data/PG_VERSION" is missing.

On the other hand, in https://www.postgresql.org/docs/current/static/runtime-config-file-locations.html it says:

If you wish, you can specify the configuration file names and locations individually using the parameters config_file, hba_file and/or ident_file. config_file can only be specified on the postgres command line, but the others can be set within the main configuration file.

My /var/lib/pgsql/10/data/postgresql.conf is configured as:

data_directory = '/usr/ip-spotlight/postgresql/data'
hba_file = '/var/lib/pgsql/10/data/pg_hba.conf'
ident_file = '/var/lib/pgsql/10/data/pg_ident.conf'

Could you please advise how to separate the config files of postgresql and the actual data storage ?

1

OK, i figured it out:

  1. initialise the db as user postgres

    name: "Create a new PostgreSQL database cluster"
    become: postgres
    command: "/usr/pgsql-{{ postgres_version.major }}/bin/pg_ctl initdb --pgdata={{ postgres_data }}"
    ignore_errors: yes
    
  2. override PGDATA env variable through systemd

    name: "Override PGDATA pathname (1/3)"
    become: yes
    file: path="/etc/systemd/system/postgresql-{{ postgres_version.major }}.service" state=touch owner=root group=root mode=0644
    when: dev.platform == "baremetal"
    
    name: "Override PGDATA pathname (2/3)"
    become: yes
    lineinfile: path="/etc/systemd/system/postgresql-{{ postgres_version.major }}.service" line=".include /lib/systemd/system/postgresql-{{ postgres_version.major }}.service" state=present
    when: dev.platform == "baremetal"
    
    name: "Override PGDATA pathname (3/3)"
    become: yes
    blockinfile:
      path: "/etc/systemd/system/postgresql-{{ postgres_version.major }}.service"
      state: present
      block: |
        [Service]
        Environment=PGDATA={{ postgres_data }}
      when: dev.platform == "baremetal"
      notify:
        reload-systemd
    
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