Troubles with connect to database in Docker Compose - postgresql

Question

In one folder I have 4 files: base.py, Dockerfile, docker-compose.yml and wait-for-it.sh.
base.py:
import psycopg2
print("JJJJJJJJ")
conn = psycopg2.connect("dbname='base123' user='postgres' host='db' password='pw1234'")
cur = conn.cursor()
cur.execute("CREATE TABLE test(id serial PRIMARY KEY, num int);")
Dockerfile:
FROM ubuntu:16.04
RUN apt-get update
RUN apt-get -y install python-pip
RUN apt-get update
RUN pip install --upgrade pip
RUN pip install psycopg2-binary
COPY base.py base.py
COPY wait-for-it.sh wait-for-it.sh
RUN chmod +x /wait-for-it.sh
CMD ["python","base.py"]
docker-compose.yml
version: '3'
services:
db:
image: 'postgres:latest'
expose:
- "5432"
ports:
- "5559:5432"
environment:
POSTGRES_PASSWORD: pw1234
POSTGRES_DB: base123
aprrka:
build: .
depends_on:
- db
command: ["./wait-for-it.sh", "db:5432", "--", "python", "base.py"]
wait-fot-it.sh:
link to code in github
After docker-compose up I have this OUTPUT:
...
Creating postgres_db_1 ... done
Creating postgres_aprrka_1 ... done
Attaching to postgres_db_1, postgres_aprrka_1
db_1 | The files belonging to this database system will be owned by user "postgres".
db_1 | This user must also own the server process.
db_1 |
db_1 | The database cluster will be initialized with locale "en_US.utf8".
db_1 | The default database encoding has accordingly been set to "UTF8".
db_1 | The default text search configuration will be set to "english".
db_1 |
db_1 | Data page checksums are disabled.
db_1 |
db_1 | fixing permissions on existing directory /var/lib/postgresql/data ... ok
db_1 | creating subdirectories ... ok
db_1 | selecting default max_connections ... 100
db_1 | selecting default shared_buffers ... 128MB
db_1 | selecting dynamic shared memory implementation ... posix
aprrka_1 | wait-for-it.sh: waiting 15 seconds for db:5432
db_1 | creating configuration files ... ok
db_1 | running bootstrap script ... ok
db_1 | performing post-bootstrap initialization ... ok
db_1 | syncing data to disk ... ok
db_1 |
db_1 | WARNING: enabling "trust" authentication for local connections
db_1 | You can change this by editing pg_hba.conf or using the option -A, or
db_1 | --auth-local and --auth-host, the next time you run initdb.
db_1 |
db_1 | Success. You can now start the database server using:
db_1 |
db_1 | pg_ctl -D /var/lib/postgresql/data -l logfile start
db_1 |
db_1 | waiting for server to start....2018-08-10 09:59:13.529 UTC [38] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
db_1 | 2018-08-10 09:59:13.582 UTC [39] LOG: database system was shut down at 2018-08-10 09:59:12 UTC
db_1 | 2018-08-10 09:59:13.599 UTC [38] LOG: database system is ready to accept connections
db_1 | done
db_1 | server started
db_1 | CREATE DATABASE
db_1 |
db_1 | ALTER ROLE
db_1 |
db_1 |
db_1 | /usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*
db_1 |
db_1 | 2018-08-10 09:59:14.585 UTC [38] LOG: received fast shutdown request
db_1 | waiting for server to shut down....2018-08-10 09:59:14.593 UTC [38] LOG: aborting any active transactions
db_1 | 2018-08-10 09:59:14.613 UTC [38] LOG: worker process: logical replication launcher (PID 45) exited with exit code 1
db_1 | 2018-08-10 09:59:14.613 UTC [40] LOG: shutting down
db_1 | 2018-08-10 09:59:14.660 UTC [38] LOG: database system is shut down
db_1 | done
db_1 | server stopped
db_1 |
db_1 | PostgreSQL init process complete; ready for start up.
db_1 |
db_1 | 2018-08-10 09:59:14.726 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
db_1 | 2018-08-10 09:59:14.726 UTC [1] LOG: listening on IPv6 address "::", port 5432
db_1 | 2018-08-10 09:59:14.729 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
db_1 | 2018-08-10 09:59:14.806 UTC [65] LOG: database system was shut down at 2018-08-10 09:59:14 UTC
db_1 | 2018-08-10 09:59:14.829 UTC [1] LOG: database system is ready to accept connections
db_1 | 2018-08-10 09:59:15.217 UTC [72] LOG: incomplete startup packet
aprrka_1 | wait-for-it.sh: db:5432 is available after 5 seconds
aprrka_1 | JJJJJJJJ
postgres_aprrka_1 exited with code 0
When I type command: psql -U postgres -h localhost -p 5559 in another terminal I can connect to base1234, but when type `\dt' i have no any relations, so my py file don't create table in postgres database. I think that no connection exist with postgres db. Please, help me

Answer 1

You need to close the cursor and commit all pending transactions to the database for the changes to be effective.
Add the following 2 lines at the end of your base.py:
cur.close()
conn.commit()