I have Postgresql on a server in a docker container. How can I connect to it from the outside, that is, from my local computer? What setting should I apply to allow that?
问题:
回答1:
You can run Postgres this way (map a port):
docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -d -p 5432:5432 postgres
So now you have mapped the port 5432 of your container to port 5432 of your server. -p <host_port>:<container_port>
.So now your postgres is accessible from your public-server-ip:5432
To test: Run the postgres database (command above)
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
05b3a3471f6f postgres "/docker-entrypoint.s" 1 seconds ago Up 1 seconds 0.0.0.0:5432->5432/tcp some-postgres
Go inside your container and create a database:
docker exec -it 05b3a3471f6f bash
root@05b3a3471f6f:/# psql -U postgres
postgres-# CREATE DATABASE mytest;
postgres-# \q
Go to your localhost (where you have some tool or the psql client).
psql -h public-ip-server -p 5432 -U postgres
(password mysecretpassword)
postgres=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+------------+------------+-----------------------
mytest | postgres | UTF8 | en_US.utf8 | en_US.utf8 |
postgres | postgres | UTF8 | en_US.utf8 | en_US.utf8 |
template0 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | =c/postgres
So you're accessing the database (which is running in docker on a server) from your localhost.
In this post it's expained in detail.
回答2:
I managed to get it run on linux
1 first run the docker postgres, make sure the port is published, I use alpine because it's lightweight.
sudo docker run --rm -P -p 127.0.0.1:5432:5432 -e POSTGRES_PASSWORD="1234" --name pg postgres:alpine
2 use another terminal, access the database from the host using the postgres uri
psql postgresql://postgres:1234@localhost:5432/postgres
for mac users, replace psql with pgcli
回答3:
I already had running postgres on host machine and didn't want to allow connections from network, so I did run temporary postgres instance in container and created database in just two lines:
# Run PostgreSQL
docker run --name postgres-container -e POSTGRES_PASSWORD=password -it -p 5433:5432 postgres
# Create database
docker exec -it postgres-container createdb -U postgres my-db
回答4:
You can also access through docker exec command also.
$ docker exec -it postgres-container bash
# su postgres
$ psql
回答5:
I tried to connect from localhost (mac) to a postgres container. I changed the port in the docker-compose file from 5432 to 3306 and started the container. No idea why I did it :|
Then I tried to connect to postgres via PSequel and adminer and the connection could not be established.
After switching back to port 5432 all works fine.
db:
image: postgres
ports:
- 5432:5432
restart: always
volumes:
- "db_sql:/var/lib/mysql"
environment:
POSTGRES_USER: root
POSTGRES_PASSWORD: password
POSTGRES_DB: postgres_db
This was my experience I wanted to share. Perhaps someone can make use of it.
回答6:
In case, it is a django backend application, you can do something like this.
docker exec -it container_id python manage.py dbshell