diff --git a/docker/README.md b/docker/README.md
index af95f4bbd52..1bdc39ef613 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -35,7 +35,8 @@ docker run -it \
 The Docker Compose setup requires an Ethereum network name and node
 to connect to. By default, it will use `mainnet:http://host.docker.internal:8545`
 in order to connect to an Ethereum node running on your host machine.
-You can replace this with anything else in `docker-compose.yaml`.
+You can replace this with anything else in `docker-compose.yaml` or set the
+environment variables `NETWORK_NAME` and `ETHEREUM_RPC_URL`.
 
 After you have set up an Ethereum node—e.g. Ganache or Parity—simply
 clone this repository and run
diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index c78c2eb2194..1ec9bfd0adc 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -6,8 +6,6 @@ services:
       - '8000:8000'
       - '8001:8001'
       - '8020:8020'
-      - '8030:8030'
-      - '8040:8040'
     depends_on:
       - ipfs
       - postgres
@@ -15,11 +13,11 @@ services:
       - host.docker.internal:host-gateway
     environment:
       postgres_host: postgres
-      postgres_user: graph-node
-      postgres_pass: let-me-in
+      postgres_user: ${POSTGRES_USER:-graph-node}
+      postgres_pass: ${POSTGRESS_PASSWORD:-let-me-in}
       postgres_db: graph-node
       ipfs: 'ipfs:5001'
-      ethereum: 'mainnet:http://host.docker.internal:8545'
+      ethereum: ${NETWORK_NAME:-mainnet}:${ETHEREUM_RPC_URL:-http://host.docker.internal:8545}
       GRAPH_LOG: info
   ipfs:
     image: ipfs/kubo:v0.17.0
@@ -29,8 +27,6 @@ services:
       - ./data/ipfs:/data/ipfs:Z
   postgres:
     image: postgres
-    ports:
-      - '5432:5432'
     command:
       [
         "postgres",
@@ -38,8 +34,8 @@ services:
         "-cmax_connections=200"
       ]
     environment:
-      POSTGRES_USER: graph-node
-      POSTGRES_PASSWORD: let-me-in
+      POSTGRES_USER: ${POSTGRES_USER:-graph-node}
+      POSTGRES_PASSWORD: ${POSTGRESS_PASSWORD:-let-me-in}
       POSTGRES_DB: graph-node
       # FIXME: remove this env. var. which we shouldn't need. Introduced by
       # <https://github.com/graphprotocol/graph-node/pull/3511>, maybe as a