Update documentation on running locally with Docker (#8020)

- Fix the dockerhub URLs

- `neondatabase/compute-node` image has been replaced with Postgres
version specific images like `neondatabase/compute-node-v16`

- Use TAG=latest in the example, rather than some old tag. That's a
sensible default for people to copy-past

- For convenience, use a Postgres connection URL in the `psql` example
that also includes the password. That way, there's no need to set up
.pgpass

- Update the image names in `docker ps` example to match what you get
when you follow the example

docs/docker.md

@@ -4,18 +4,18 @@
 
 Currently we build two main images:
 
-- [neondatabase/neon](https://hub.docker.com/repository/docker/zenithdb/zenith) — image with pre-built `pageserver`, `safekeeper` and `proxy` binaries and all the required runtime dependencies. Built from [/Dockerfile](/Dockerfile).
-- [neondatabase/compute-node](https://hub.docker.com/repository/docker/zenithdb/compute-node) — compute node image with pre-built Postgres binaries from [neondatabase/postgres](https://github.com/neondatabase/postgres).
+- [neondatabase/neon](https://hub.docker.com/repository/docker/neondatabase/neon) — image with pre-built `pageserver`, `safekeeper` and `proxy` binaries and all the required runtime dependencies. Built from [/Dockerfile](/Dockerfile).
+- [neondatabase/compute-node-v16](https://hub.docker.com/repository/docker/neondatabase/compute-node-v16) — compute node image with pre-built Postgres binaries from [neondatabase/postgres](https://github.com/neondatabase/postgres). Similar images exist for v15 and v14.
 
 And additional intermediate image:
 
 - [neondatabase/compute-tools](https://hub.docker.com/repository/docker/neondatabase/compute-tools) — compute node configuration management tools.
 
-## Building pipeline
+## Build pipeline
 
 We build all images after a successful `release` tests run and push automatically to Docker Hub with two parallel CI jobs
 
-1. `neondatabase/compute-tools` and `neondatabase/compute-node`
+1. `neondatabase/compute-tools` and `neondatabase/compute-node-v16` (and -v15 and -v14)
 
 2. `neondatabase/neon`
 
@@ -34,42 +34,44 @@ You can see a [docker compose](https://docs.docker.com/compose/) example to crea
 1. create containers
 
 You can specify version of neon cluster using following environment values.
-- PG_VERSION: postgres version for compute (default is 16)
-- TAG: the tag version of [docker image](https://registry.hub.docker.com/r/neondatabase/neon/tags) (default is latest), which is tagged in [CI test](/.github/workflows/build_and_test.yml)
+- PG_VERSION: postgres version for compute (default is 16 as of this writing)
+- TAG: the tag version of [docker image](https://registry.hub.docker.com/r/neondatabase/neon/tags), which is tagged in [CI test](/.github/workflows/build_and_test.yml). Default is 'latest'
 ```
 $ cd docker-compose/
 $ docker-compose down   # remove the containers if exists
-$ PG_VERSION=16 TAG=2937 docker-compose up --build -d  # You can specify the postgres and image version
+$ PG_VERSION=16 TAG=latest docker-compose up --build -d  # You can specify the postgres and image version
 Creating network "dockercompose_default" with the default driver
 Creating docker-compose_storage_broker_1       ... done
 (...omit...)
 ```
 
 2. connect compute node
 ```
-$ echo "localhost:55433:postgres:cloud_admin:cloud_admin" >> ~/.pgpass
-$ chmod 600 ~/.pgpass
-$ psql -h localhost -p 55433 -U cloud_admin
+$ psql postgresql://cloud_admin:cloud_admin@localhost:55433/postgres
+psql (16.3)
+Type "help" for help.
+
 postgres=# CREATE TABLE t(key int primary key, value text);
 CREATE TABLE
-postgres=# insert into t values(1,1);
+postgres=# insert into t values(1, 1);
 INSERT 0 1
 postgres=# select * from t;
- key | value
+ key | value 
 -----+-------
    1 | 1
 (1 row)
+
 ```
 
 3. If you want to see the log, you can use `docker-compose logs` command.
 ```
 # check the container name you want to see
 $ docker ps
-CONTAINER ID   IMAGE                                              COMMAND                  CREATED         STATUS         PORTS                                                                                                                                  NAMES
-d6968a5ae912   dockercompose_compute                              "/shell/compute.sh"      5 minutes ago   Up 5 minutes   0.0.0.0:3080->3080/tcp, 0.0.0.0:55433->55433/tcp                                                                                       dockercompose_compute_1
+CONTAINER ID   IMAGE                                              COMMAND                  CREATED         STATUS         PORTS                                                                                      NAMES
+3582f6d76227   docker-compose_compute                             "/shell/compute.sh"      2 minutes ago   Up 2 minutes   0.0.0.0:3080->3080/tcp, :::3080->3080/tcp, 0.0.0.0:55433->55433/tcp, :::55433->55433/tcp   docker-compose_compute_1
 (...omit...)
 
-$ docker logs -f dockercompose_compute_1
+$ docker logs -f docker-compose_compute_1
 2022-10-21 06:15:48.757 GMT [56] LOG:  connection authorized: user=cloud_admin database=postgres application_name=psql
 2022-10-21 06:17:00.307 GMT [56] LOG:  [NEON_SMGR] libpagestore: connected to 'host=pageserver port=6400'
 (...omit...)