Why I can't connect to postgres in docker? - docker

Question

I used docker-compose from this project. Both docker containers were launched successfully.
kshnkvn#kshnkvn-vb:~$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
10fafbab73dc openpoiservice_gunicorn_flask "/ops_venv/bin/gunic…" 23 minutes ago Up 22 minutes 0.0.0.0:5000->5000/tcp openpoiservice_gunicorn_flask_1
a66fe5691455 kartoza/postgis:11.0-2.5 "/bin/sh -c /docker-…" 23 minutes ago Up 22 minutes 5432/tcp openpoiservice_psql_postgis_db_1
But when trying to check the service for functionality - he could not connect to the database. I tried to do it manually:
kshnkvn#kshnkvn-vb:~$ docker exec -it 10fafbab73dc /bin/bash
root#10fafbab73dc:/deploy/app# psql -h localhost -U gis_admin-gis
psql: could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Cannot assign requested address
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
root#10fafbab73dc:/deploy/app#
Strange, checked just in case that the type of container network is the bridge:
kshnkvn#kshnkvn-vb:~$ docker network ls
NETWORK ID NAME DRIVER SCOPE
81001dac99c0 bridge bridge local
8e65fb4ef6f8 host host local
94ce4e1605ef none null local
a3f48ac3facc openpoiservice_default bridge local
e3d4286df013 openpoiservice_poi_network bridge local
Checked postgres launch logs:
kshnkvn#kshnkvn-vb:~$ docker logs a66fe5691455
Add rule to pg_hba: 0.0.0.0/0
Add rule to pg_hba: replication replicator
Setup master database
psql: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
2020-02-08 13:50:20.675 UTC [25] LOG: listening on IPv4 address "127.0.0.1", port 5432
2020-02-08 13:50:20.683 UTC [25] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2020-02-08 13:50:20.756 UTC [37] LOG: database system was interrupted; last known up at 2020-02-08 13:35:17 UTC
2020-02-08 13:50:21.830 UTC [48] postgres#postgres FATAL: the database system is starting up
psql: FATAL: the database system is starting up
2020-02-08 13:50:22.726 UTC [37] LOG: database system was not properly shut down; automatic recovery in progress
2020-02-08 13:50:22.730 UTC [37] LOG: redo starts at 0/21CCC50
2020-02-08 13:50:22.730 UTC [37] LOG: invalid record length at 0/21CCC88: wanted 24, got 0
2020-02-08 13:50:22.730 UTC [37] LOG: redo done at 0/21CCC50
2020-02-08 13:50:22.867 UTC [25] LOG: database system is ready to accept connections
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+-----------+----------+---------+---------+-----------------------
gis | gis_admin | UTF8 | C.UTF-8 | C.UTF-8 |
postgres | postgres | UTF8 | C.UTF-8 | C.UTF-8 |
template0 | postgres | UTF8 | C.UTF-8 | C.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | C.UTF-8 | C.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
(4 rows)
postgres ready
Setup postgres User:Password
Creating superuser gis_admin
ALTER ROLE
Creating replication user replicator
ALTER ROLE
gis db already exists
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+-----------+----------+---------+---------+-----------------------
gis | gis_admin | UTF8 | C.UTF-8 | C.UTF-8 |
postgres | postgres | UTF8 | C.UTF-8 | C.UTF-8 |
template0 | postgres | UTF8 | C.UTF-8 | C.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | C.UTF-8 | C.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
(4 rows)
2020-02-08 13:50:24.785 UTC [25] LOG: received smart shutdown request
2020-02-08 13:50:24.799 UTC [25] LOG: background worker "logical replication launcher" (PID 58) exited with exit code 1
2020-02-08 13:50:24.801 UTC [53] LOG: shutting down
2020-02-08 13:50:24.838 UTC [25] LOG: database system is shut down
Postgres initialisation process completed .... restarting in foreground
2020-02-08 13:50:25.842 UTC [148] LOG: listening on IPv4 address "0.0.0.0", port 5432
2020-02-08 13:50:25.842 UTC [148] LOG: listening on IPv6 address "::", port 5432
2020-02-08 13:50:25.850 UTC [148] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2020-02-08 13:50:25.880 UTC [150] LOG: database system was shut down at 2020-02-08 13:50:24 UTC
2020-02-08 13:50:25.887 UTC [148] LOG: database system is ready to accept connections
It looks like the postgre started on ip 0.0.0.0
I looked at what ip are used by the docker ip addr show command. Tried to reconnect using this ip:
psql: could not connect to server: Connection refused
Is the server running on host "172.17.0.1" and accepting
TCP/IP connections on port 5432?
root#10fafbab73dc:/deploy/app# psql -h 172.17.255.255 -U gis_admin-gis
psql: could not connect to server: Connection timed out
Is the server running on host "172.17.255.255" and accepting
TCP/IP connections on port 5432?
What can I try to do to connect the script to the database?

Answer 1

I you are running with docker-compose.yml and want to connect postgis from your host, you need to map the port, by adding:
ports:
- "25432:25432"
within the psql_postgis_db container (in docker-compose.yml file).
Moreover, you can override the username & password with the POSTGRES_USER and POSTGRES_PASS environment variables. You can see the default username and password in the docker-compose.yml file.
version: '2.2'
volumes:
postgis-data:
services:
gunicorn_flask:
#network_mode: "host"
build: .
volumes:
- ./osm:/deploy/app/osm
- ./ops_settings_docker.yml:/deploy/app/openpoiservice/server/ops_settings.yml
- ./categories_docker.yml:/deploy/app/openpoiservice/server/categories/categories.yml
ports:
- "5000:5000"
mem_limit: 28g
networks:
- poi_network
# Don't forget to change the host name inside ops_settings_docker.yml by the one given to docker container.
# Also port should be set to 5432 (default value) inside the same file since they are on the same network
psql_postgis_db:
image: kartoza/postgis:11.0-2.5
volumes:
- postgis-data:/var/lib/postgresql
environment:
# If you need to create multiple database you can add coma separated databases eg gis,data
- POSTGRES_DB=gis
- POSTGRES_USER=gis_admin # Here it's important to keep the same name as the one configured inside ops_settings_docker.yml
- POSTGRES_PASS=admin # Here it's important to keep the same name as the one configured inside ops_settings_docker.yml
- POSTGRES_DBNAME=gis # Here it's important to keep the same name as the one configured inside ops_settings_docker.yml
- ALLOW_IP_RANGE=0.0.0.0/0
ports:
- "25432:25432"
restart: on-failure
networks:
- poi_network
networks:
poi_network:
BTW, you must have postgresql-client on your localhost if you want to connect from your host.