Using multiple databases with the official PostgreSQL Docker image

This directory contains a script to create multiple databases using that mechanism.

The following script uses the user and password information in file ./users/users.txt to to create a database per user, set the password for that database and then initialize the postgis extensions.

The user file should contain pairs of lines that are the user and password. e.g.

user1
passwd1
user2
passwd2

Usage

• Create a directory 'dbdata' - if you need to re-create it, note that you'll need to use sudo so sudo rm -rf ./dbdata ; mkdir dbdata is useful

• Run docker-compose up

This should create the default databases (and one called myapp with the configuration as is).

Then, run users/all-users-add.sh and it will add databases for individual users. You can run that multiple times (e.g. if you decide to add a new user).

The resulting set of databases can be listed by connecting and using \list:

$ psql postgresql://myapp:changeme@localhost

myapp=# \list
                                 List of databases
       Name       | Owner | Encoding |  Collate   |   Ctype    | Access privileges
------------------+-------+----------+------------+------------+-------------------
 alice            | myapp | UTF8     | en_US.utf8 | en_US.utf8 | =Tc/myapp        +
                  |       |          |            |            | myapp=CTc/myapp  +
                  |       |          |            |            | db1=CTc/myapp
 bob              | myapp | UTF8     | en_US.utf8 | en_US.utf8 | =Tc/myapp        +
                  |       |          |            |            | myapp=CTc/myapp  +
                  |       |          |            |            | db2=CTc/myapp
 myapp            | myapp | UTF8     | en_US.utf8 | en_US.utf8 |
 postgres         | myapp | UTF8     | en_US.utf8 | en_US.utf8 |
 template0        | myapp | UTF8     | en_US.utf8 | en_US.utf8 | =c/myapp         +
                  |       |          |            |            | myapp=CTc/myapp
 template1        | myapp | UTF8     | en_US.utf8 | en_US.utf8 | =c/myapp         +
                  |       |          |            |            | myapp=CTc/myapp
 template_postgis | myapp | UTF8     | en_US.utf8 | en_US.utf8 |
(7 rows)

myapp=# \q

Test it out

The script ./users/all-users-test.sh will loop through each user and question run postgres_version() to insure that the postgis extensions are installed. It will also create a table that uses a GEOM type which would fail if postgis is not setup correctly.

beast-61$ ./all-users-test.sh
Databases are...
                                 List of databases
       Name       | Owner | Encoding |  Collate   |   Ctype    | Access privileges
------------------+-------+----------+------------+------------+-------------------
 alice            | myapp | UTF8     | en_US.utf8 | en_US.utf8 | =Tc/myapp        +
                  |       |          |            |            | myapp=CTc/myapp  +
                  |       |          |            |            | alice=CTc/myapp
 bob              | myapp | UTF8     | en_US.utf8 | en_US.utf8 | =Tc/myapp        +
                  |       |          |            |            | myapp=CTc/myapp  +
                  |       |          |            |            | bob=CTc/myapp
 myapp            | myapp | UTF8     | en_US.utf8 | en_US.utf8 |
 postgres         | myapp | UTF8     | en_US.utf8 | en_US.utf8 |
 template0        | myapp | UTF8     | en_US.utf8 | en_US.utf8 | =c/myapp         +
                  |       |          |            |            | myapp=CTc/myapp
 template1        | myapp | UTF8     | en_US.utf8 | en_US.utf8 | =c/myapp         +
                  |       |          |            |            | myapp=CTc/myapp
 template_postgis | myapp | UTF8     | en_US.utf8 | en_US.utf8 |
(7 rows)

dbuser is alice
dbpasswd is alicePassword
dbuser is alice
dbpasswd is alicePassword
 List of schemas
   Name   | Owner
----------+-------
 public   | myapp
 topology | myapp
(2 rows)

             List of relations
  Schema  |      Name       | Type  | Owner
----------+-----------------+-------+-------
 public   | spatial_ref_sys | table | myapp
 public   | states          | table | alice
 topology | layer           | table | myapp
 topology | topology        | table | myapp
(4 rows)

                                                                                              postgis_full_version
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 POSTGIS="3.1.1 aaf4c79" [EXTENSION] PGSQL="130" GEOS="3.7.1-CAPI-1.11.1 27a5e771" PROJ="Rel. 5.2.0, September 15th, 2018" LIBXML="2.9.4" LIBJSON="0.12.1" LIBPROTOBUF="1.3.1" WAGYU="0.5.0 (Internal)" TOPOLOGY
(1 row)

DROP TABLE
CREATE TABLE
dbuser is bob
dbpasswd is bobPassword
dbuser is bob
dbpasswd is bobPassword
 List of schemas
   Name   | Owner
----------+-------
 public   | myapp
 topology | myapp
(2 rows)

             List of relations
  Schema  |      Name       | Type  | Owner
----------+-----------------+-------+-------
 public   | spatial_ref_sys | table | myapp
 public   | states          | table | bob
 topology | layer           | table | myapp
 topology | topology        | table | myapp
(4 rows)

                                                                                              postgis_full_version
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 POSTGIS="3.1.1 aaf4c79" [EXTENSION] PGSQL="130" GEOS="3.7.1-CAPI-1.11.1 27a5e771" PROJ="Rel. 5.2.0, September 15th, 2018" LIBXML="2.9.4" LIBJSON="0.12.1" LIBPROTOBUF="1.3.1" WAGYU="0.5.0 (Internal)" TOPOLOGY
(1 row)

DROP TABLE
CREATE TABLE