diff --git a/docker/Dockerfile b/docker/Dockerfile
index 20d3fe3bd8..1d00defc2d 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,5 @@
-FROM docker.io/python:2-alpine3.8
+ARG PYTHON_VERSION=2
+FROM docker.io/python:${PYTHON_VERSION}-alpine3.8
COPY . /synapse
diff --git a/docker/Dockerfile-pgtests b/docker/Dockerfile-pgtests
new file mode 100644
index 0000000000..7da8eeb9eb
--- /dev/null
+++ b/docker/Dockerfile-pgtests
@@ -0,0 +1,12 @@
+# Use the Sytest image that comes with a lot of the build dependencies
+# pre-installed
+FROM matrixdotorg/sytest:latest
+
+# The Sytest image doesn't come with python, so install that
+RUN apt-get -qq install -y python python-dev python-pip
+
+# We need tox to run the tests in run_pg_tests.sh
+RUN pip install tox
+
+ADD run_pg_tests.sh /pg_tests.sh
+ENTRYPOINT /pg_tests.sh
diff --git a/docker/run_pg_tests.sh b/docker/run_pg_tests.sh
new file mode 100755
index 0000000000..e77424c41a
--- /dev/null
+++ b/docker/run_pg_tests.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# This script runs the PostgreSQL tests inside a Docker container. It expects
+# the relevant source files to be mounted into /src (done automatically by the
+# caller script). It will set up the database, run it, and then use the tox
+# configuration to run the tests.
+
+set -e
+
+# Set PGUSER so Synapse's tests know what user to connect to the database with
+export PGUSER=postgres
+
+# Initialise & start the database
+su -c '/usr/lib/postgresql/9.6/bin/initdb -D /var/lib/postgresql/data -E "UTF-8" --lc-collate="en_US.UTF-8" --lc-ctype="en_US.UTF-8" --username=postgres' postgres
+su -c '/usr/lib/postgresql/9.6/bin/pg_ctl -w -D /var/lib/postgresql/data start' postgres
+
+# Run the tests
+cd /src
+export TRIAL_FLAGS="-j 4"
+tox --workdir=/tmp -e py27-postgres
diff --git a/docker/start.py b/docker/start.py
index 90e8b9c51a..346df8c87f 100755
--- a/docker/start.py
+++ b/docker/start.py
@@ -5,6 +5,7 @@ import os
import sys
import subprocess
import glob
+import codecs
# Utility functions
convert = lambda src, dst, environ: open(dst, "w").write(jinja2.Template(open(src).read()).render(**environ))
@@ -23,7 +24,7 @@ def generate_secrets(environ, secrets):
with open(filename) as handle: value = handle.read()
else:
print("Generating a random secret for {}".format(name))
- value = os.urandom(32).encode("hex")
+ value = codecs.encode(os.urandom(32), "hex").decode()
with open(filename, "w") as handle: handle.write(value)
environ[secret] = value
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