Run PostgreSQL locally without installing the server: define one PostgreSQL service in Docker Compose, keep its database files in a named volume, and use a Makefile for the commands you repeat. Bind the published port to 127.0.0.1 if host tools such as psql or a GUI client need access. The setup below uses the PostgreSQL 18 image layout documented by Docker.
Define one PostgreSQL service in Compose
Save this as compose.yaml in your project. It starts only the database container; your application and database client can run on the host.
services:
db:
image: postgres:18
restart: unless-stopped
environment:
POSTGRES_USER: ${POSTGRES_USER:-dev}
POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD in .env}
POSTGRES_DB: ${POSTGRES_DB:-dev}
ports:
- "127.0.0.1:5432:5432"
volumes:
- postgres_data:/var/lib/postgresql
healthcheck:
test: ["CMD-SHELL", "pg_isready -U $${POSTGRES_USER} -d $${POSTGRES_DB}"]
interval: 5s
timeout: 5s
retries: 5
volumes:
postgres_data:Docker’s current PostgreSQL guide uses the postgres:18 image and mounts a named volume at /var/lib/postgresql. For PostgreSQL 18 and later, the image uses a version-specific subdirectory under that parent path; mounting there also supports easier pg_upgrade --link upgrades. Do not carry forward the older /var/lib/postgresql/data mount convention without checking the image version. See Docker’s PostgreSQL guide.
The POSTGRES_PASSWORD interpolation makes Compose stop with an error if no password is supplied. Create a local .env file beside compose.yaml:
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POSTGRES_USER=dev
POSTGRES_PASSWORD=choose-a-local-password
POSTGRES_DB=devKeep real credentials out of committed files; add .env to .gitignore. These variables initialize a new, empty database directory. They are not a mechanism for changing the password, user, database, or initialization behavior of an already populated volume. The official image documents the variables and first-run behavior in its PostgreSQL image documentation.
Why use a named volume?
The container can be replaced while the database files remain. Compose creates the declared named volume when needed and reuses it on later runs; removing a container alone does not remove that data. Named volumes are the straightforward choice for most local setups. A bind mount instead exposes a specific host directory, which can be useful when direct host-file access matters but may introduce file ownership or permission problems. See Docker’s volume documentation.
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Why bind the port to loopback?
127.0.0.1:5432:5432 makes the database available to programs on the same host through port 5432 without publishing it on the machine’s other network interfaces. Docker’s guide recommends loopback binding for a database intended for same-host access. If port 5432 is already occupied, change the host-side port, for example to 127.0.0.1:5433:5432, and connect your host client to port 5433; the container still listens on 5432.
Put routine operations behind Make targets
Save this as Makefile. The targets are a thin, readable interface to Compose; they do not change what Compose or PostgreSQL does.
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.PHONY: help up down ps logs psql wait reset
help:
@echo "up Start PostgreSQL"
@echo "down Stop and remove the container; keep database data"
@echo "ps Show service status"
@echo "logs Follow PostgreSQL logs"
@echo "psql Open psql inside the container"
@echo "wait Wait until PostgreSQL accepts connections"
@echo "reset DESTRUCTIVE: remove the container and database volume"
up:
docker compose up -d
down:
docker compose down
ps:
docker compose ps
logs:
docker compose logs -f db
psql:
docker compose exec db sh -c 'exec psql -U "$$POSTGRES_USER" -d "$$POSTGRES_DB"'
wait:
@until docker compose exec -T db sh -c 'pg_isready -U "$$POSTGRES_USER" -d "$$POSTGRES_DB"' >/dev/null 2>&1; do
docker compose ps db;
sleep 1;
done
@echo "PostgreSQL is accepting connections"
reset:
@echo "DESTRUCTIVE: this removes the PostgreSQL volume and all its data."
@echo "Run 'docker compose down -v' only if you intend to start with an empty database."
@falseUse make help to see the available commands. Start the database with make up, check it with make ps, and follow its output with make logs. The make wait target repeatedly checks readiness from inside the container, which is useful before a host-run script or application attempts its first connection. Stop the service with make down; the named volume remains.
The reset target intentionally refuses to run the destructive command automatically. After confirming you want to delete the database, run docker compose down -v yourself. Docker documents that ordinary down preserves named volumes, while down -v removes them; see the volume reference.
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Connect from host tools
With the default values in the example, a host-installed client can connect to localhost on port 5432 using database dev and user dev. For example:
psql -h 127.0.0.1 -p 5432 -U dev -d devpsql prompts for the password. A GUI client uses the same host, port, database, username, and password fields. Alternatively, use make psql to launch psql inside the database container; that does not require installing psql on the host.
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Understand startup readiness and initialization
Running is not the same as ready
Compose’s normal startup ordering waits until a container is running, not until the service can accept database connections. Docker states: “On startup, Compose does not wait until a container is ‘ready’, only until it’s running.” The healthcheck above runs pg_isready; the make wait target gives host-run workflows a way to check readiness explicitly. If a separate application container is later added, configure its dependency on the database with condition: service_healthy so Compose waits for the healthcheck. See Docker’s startup-order guidance.
Changed environment values do not rewrite an existing database
The official PostgreSQL image applies initialization variables and scripts when it initializes an empty data directory. If the named volume already contains a database, changing POSTGRES_PASSWORD, POSTGRES_USER, POSTGRES_DB, or an initialization script does not reconfigure that existing database. Change database credentials through PostgreSQL itself when retaining the data is important. A fresh initialization requires deleting the volume, which erases its contents.
Named volume or bind mount?
| Choice | What it does | Trade-off |
|---|---|---|
| Named volume | Stores database files in Docker-managed storage and persists independently of the container. | Simple lifecycle and reuse; inspect or manipulate its files through Docker rather than an ordinary project directory. |
| Bind mount | Maps a chosen host path into the container. | Direct host-path access, but permissions and ownership can be troublesome. |
For a compact local database that host tools reach over a port, the named volume avoids coupling the database’s storage to a particular project folder. Either way, treat the stored files as valuable data: removing the container and removing its storage are different operations.
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