Docker - How can run the psql command in the postgres container? - postgresql

Question

I would like to use the psql in the postgres image in order to run some queries on the database.
But unfortunately when I attach to the postgres container, I got that error the psql command is not found...
For me a little bit it is a mystery how I can run postgre sql queries or commands in the container.
How run the psql command in the postgres container? (I am a new guy in Docker world)
I use Ubuntu as a host machine, and I did not install the postgres on the host machine, I use the postgres container instead.
docker-compose ps
Name Command State Ports
---------------------------------------------------------------------------------------------
yiialkalmi_app_1 /bin/bash Exit 0
yiialkalmi_nginx_1 nginx -g daemon off; Up 443/tcp, 0.0.0.0:80->80/tcp
yiialkalmi_php_1 php-fpm Up 9000/tcp
yiialkalmi_postgres_1 /docker-entrypoint.sh postgres Up 5432/tcp
yiialkalmi_redis_1 docker-entrypoint.sh redis ... Up 6379/tcp
Here the containers:
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
315567db2dff yiialkalmi_nginx "nginx -g 'daemon off" 18 hours ago Up 3 hours 0.0.0.0:80->80/tcp, 443/tcp yiialkalmi_nginx_1
53577722df71 yiialkalmi_php "php-fpm" 18 hours ago Up 3 hours 9000/tcp yiialkalmi_php_1
40e39bd0329a postgres:latest "/docker-entrypoint.s" 18 hours ago Up 3 hours 5432/tcp yiialkalmi_postgres_1
5cc47477b72d redis:latest "docker-entrypoint.sh" 19 hours ago Up 3 hours 6379/tcp yiialkalmi_redis_1
And this is my docker-compose.yml:
app:
image: ubuntu:16.04
volumes:
- .:/var/www/html
nginx:
build: ./docker/nginx/
ports:
- 80:80
links:
- php
volumes_from:
- app
volumes:
- ./docker/nginx/conf.d:/etc/nginx/conf.d
php:
build: ./docker/php/
expose:
- 9000
links:
- postgres
- redis
volumes_from:
- app
postgres:
image: postgres:latest
volumes:
- /var/lib/postgres
environment:
POSTGRES_DB: project
POSTGRES_USER: project
POSTGRES_PASSWORD: project
redis:
image: redis:latest
expose:
- 6379

Answer 1

docker exec -it yiialkalmi_postgres_1 psql -U project -W project
Some explanation
docker exec -it
The command to run a command to a running container. The it flags open an interactive tty. Basically it will cause to attach to the terminal. If you wanted to open the bash terminal you can do this
docker exec -it yiialkalmi_postgres_1 bash
yiialkalmi_postgres_1
The container name (you could use the container id instead, which in your case would be 40e39bd0329a )
psql -U project -W project
The command to execute to the running container
U user
W Tell psql that the user needs to be prompted for the password at connection time. This parameter is optional. Without this parameter, there is an extra connection attempt which will usually find out that a password is needed, see the PostgreSQL docs.
project the database you want to connect to. There is no need for the -d parameter to mark it as the dbname when it is the first non-option argument, see the docs: -d "is equivalent to specifying dbname as the first non-option argument on the command line."
These are specified by you here
environment:
POSTGRES_DB: project
POSTGRES_USER: project
POSTGRES_PASSWORD: project

Answer 2

This worked for me:
goto bash :
docker exec -it <container-name> bash
from bash :
psql -U <dataBaseUserName> <dataBaseName>
or just this one-liner :
docker exec -it <container-name> psql -U <dataBaseUserName> <dataBaseName>
helps ?

Answer 3

After the Postgres container is configured using docker, open the bash terminal using:
docker exec -it <containerID>(postgres container name / ID) bash
Switch to the Postgres user:
su - postgres
Then run:
psql
It will open the terminal access for the Postgres.

Answer 4

If you need to restore the database in a container you can do this:
docker exec -i app_db_1 psql -U postgres < app_development.back
Don't forget to add -i.
:)

Answer 5

You can enter inside the postgres container using docker-compose by typing the following
docker-compose exec postgres bash
knowing that postgres is the name of the service. Replace it with the name of the Postgresql service in you docker-compose file.
if you have many docker-compose files, you have to add the specific docker-compose.yml file you want to execute the command with. Use the following commnand instead.
docker-compose -f < specific docker-compose.yml> exec postgres bash
For example if you want to run the command with a docker-compose file called local.yml, here the command will be
docker-compose -f local.yml exec postgres bash
Then, use psql command and specify the database name with the -d flag and the username with the -U flag
psql -U <database username you want to connect with> -d <database name>
Baammm!!!!! you are in.

Answer 6

If you have running "postgres" container:
docker run -it --rm --link postgres:postgres postgres:9.6 sh -c "exec psql -h \$POSTGRES_PORT_5432_TCP_ADDR -p \$POSTGRES_PORT_5432_TCP_PORT -U postgres"

Answer 7

We can enter the container with a terminal sh or bash by using,
docker run -it <container id | name> <sh | bash>
if assume it is sh,
psql -U postgres
will work

Answer 8

RUN /etc/init.d/postgresql start &&\
psql --command "CREATE USER docker WITH SUPERUSER PASSWORD 'docker';" &&\
createdb -O docker docker &&\

Answer 9

Just fired up a local test, not sure if -c is what you were after from the cli.
docker run -it --rm --name psql-test-connection -e PGPASSWORD=1234 postgres psql -h kubernetes.docker.internal -U awx -c "\conninfo"
You are connected to database "awx" as user "awx" on host "kubernetes.docker.internal" (address "192.168.65.4") at port "5432".

Answer 10

In many common setups, the PostgreSQL port is published out to the host.
postgres:
ports:
- '12345:5432'
If this is the case, you don't need to do anything Docker-specific to connect to the database. You can use the psql client directly on your host system pointing to the first ports: number.
psql -h localhost -p 12345 -U project
This approach only requires psql or another ordinary PostgreSQL client be installed on the host and that the database container be configured with ports: making it accessible from outside Docker. (The ports: are not necessary for inter-container communication and a production-oriented setup could reasonably not have them.) This does not require the ability to run docker commands and the attendant security concerns, and it can avoid multiple layers of additional command quoting from a docker exec sh -c '...' sequence.

Answer 11

Without using an external terminal a person can run SQL commands within the container CLI.
psql -d [database-name] -U [username] -W
** Don't forget to replace [database-name] with your db-name & [username] with your actual username
Flags:
-d : Specify the database name you want to connect
-U : Specify the username as whom you want to connect
-W : Prompt for the password