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Last pushed: 2 months ago
Short Description
Postgres / Postgis database for use as part of a OpenStreetMap tile server stack
Full Description

Postgres 9.6 with PostGIS 2.4 (Geos 3.6), with SFCGAL (1.3), pgrouting 2.3.1, raster, and SSL support.

Mapping the data volume path

  • This container maps the /postgresql/9.6/main volume path. If you do not map a local directory path to this volume, then it will create a new database setup inside the container. This data WILL NOT persist if you delete the container.

  • If you map the volume /postgresql/9.6/main to a local directory path, and if this directory is empty, then a new database will be initialised in this location.

  • If this locally mapped directory is not empty, then the container will try to reuse an existing database if present inside this directory. If it is not able to do so, or if the folder contains other files or folders, then you will encounter an error.

Environment variables

The following environment variables can be set for configuring a new database.

Environment Variable Default Description
PG_USER my_username The username for your database role (user).
PG_PASSWORD my_password Your password.
DB_NAME my_db The name for the new database.

Port Mapping

You will not be able to connect to your database at localhost:5432 unless you first map the docker container's exposed 5432 port to your local 5432 port.

Gotchas

If you first upload data to your container (before providing a mapped volume to your local machine), and then subsequently provide a mapped volume, then the mapped volume will be mapped over the internal folder and you will not be able to see data you may have previously uploaded into the container until you run it again without a volume mapping.

Example

For running the database detached and then following the logs:

docker run -d -p 5432:5432  \
    -e "PG_USER=my_username" \
    -e "PG_PASSWORD=my_password" \
    -e "DB_NAME=my_db" \
    --restart=unless-stopped \
    --volume=postgisvolume:/postgresql/9.6/main \
    onelouder/postgis
docker logs -f <docker image id>

If you are running the container using an existing folder that already contains a configured database, then you can omit the environment flags. Note that if you omit the environment arguments when initializing a new database, then the default values will be used.

Using with SSL

To use SSL, prepare a server.crt (certificate file) and server.key (key file) and place these in a folder.
Then map the folder to the container's /postgresql/9.6/ssl/ path by passing an additional volume flag, i.e.:

docker run -d -p 5432:5432  \
    -e "PG_USER=my_username" \
    -e "PG_PASSWORD=my_password" \
    -e "DB_NAME=my_db" \
    --restart=unless-stopped \
    --volume=postgisvolume:/postgresql/9.6/main \
    --volume=postgissslvolume:/postgresql/9.6/ssl` \
    onelouder/postgis
docker logs -f <docker image id>

Provided you have a domain name mapped to your postgres server, then you can prepare a certificate and key file by using the free lets-enccrypt service.
For example:

# install acme.sh
sudo apt-get install wget cron netcat
wget -O - https://get.acme.sh | sh

# generate the certificate for your domain
sudo ~/.acme.sh/acme.sh --issue --standalone -d my_domain.com

# install the certificate and key file to your folder path
mkdir /path/to/local/ssl/files
~/.acme.sh/acme.sh --installcert -d my_domain.com \
    --certpath    /path/to/ssl/server.crt \
    --keypath     /path/to/ssl/server.key
sudo chmod 0600 /path/to/ssl/server.key

Configuration Parameters

The default configured settings are based on 4GB of RAM and a maximum 50 connections. The tuning parameters are set in accordance with http://pgtune.leopard.in.ua. You can edit the postgresql.conf file inside your mapped data path directory for further customisation. These will have been appended to the end of the file and should be modified there.

max_connections = 50
shared_buffers = 1GB
effective_cache_size = 3GB
work_mem = 10485kB
maintenance_work_mem = 256MB
min_wal_size = 1GB
max_wal_size = 2GB
checkpoint_completion_target = 0.9
wal_buffers = 16MB
default_statistics_target = 100

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