Create table in PostgreSQL docker image

Question

I am new to docker. I have extended PostgreSQL image and able to create new DB instance while running the image.I need to create tables in that DB from shell script that wil

Answer 1

In the docker-entrypoint.sh script of the official docker image of postgres is written:

psql+=( --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" )

        echo
        for f in /docker-entrypoint-initdb.d/*; do
            case "$f" in
                *.sh)     echo "$0: running $f"; . "$f" ;;
                *.sql)    echo "$0: running $f"; "${psql[@]}" < "$f"; echo ;;
                *.sql.gz) echo "$0: running $f"; gunzip -c "$f" | "${psql[@]}"; echo ;;
                *)        echo "$0: ignoring $f" ;;
            esac
            echo
done

So every .sql file you want to execute inside your docker image can just be placed inside that folder. So my dockerfile looks like

FROM postgres:9.3
ENV POSTGRES_USER docker
ENV POSTGRES_PASSWORD docker
ENV POSTGRES_DB docker
ADD CreateDB.sql /docker-entrypoint-initdb.d/

And the content of my CreateDB.sql:

CREATE TABLE web_origins (
    client_id character varying(36) NOT NULL,
    value character varying(255)
);

So I just start my container with:

docker run -d my-postgres

To check:

docker exec -it 6250aee43d12 bash
root@6250aee43d12:/# psql -h localhost -p 5432 -U docker -d docker
psql (9.3.13)
Type "help" for help.

docker=# \c
You are now connected to database "docker" as user "docker".
docker=# \dt
           List of relations
 Schema |    Name     | Type  | Owner
--------+-------------+-------+--------
 public | web_origins | table | docker
(1 row)

You can find the details for mysql here in this blog.