diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index c1ca9c5b6..d3ec227bf 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -7,4 +7,6 @@ RUN usermod -l zipline node \
     && chmod 0440 /etc/sudoers.d/zipline \
     && sudo apt-get update && apt-get install gnupg2 -y
 
-USER zipline
\ No newline at end of file
+EXPOSE 3000
+
+USER zipline
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 16432d760..b906d2c37 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -41,7 +41,7 @@
   "remoteUser": "zipline",
   "updateRemoteUserUID": true,
   "remoteEnv": {
-    "CORE_DATABASE_URL": "postgres://postgres:postgres@localhost/zip10"
+    "CORE_DATABASE_URL": "postgres://postgres:postgres@db/zip10"
   },
   "portsAttributes": {
     "3000": {
diff --git a/.env.local.example b/.env.local.example
index 2284b89ba..7c2a44a40 100644
--- a/.env.local.example
+++ b/.env.local.example
@@ -7,7 +7,7 @@ CORE_RETURN_HTTPS=true
 CORE_SECRET="changethis"
 CORE_HOST=0.0.0.0
 CORE_PORT=3000
-CORE_DATABASE_URL="postgres://postgres:postgres@localhost/zip10"
+CORE_DATABASE_URL="postgres://postgres:postgres@db/zip10"
 CORE_LOGGER=false
 CORE_STATS_INTERVAL=1800
 CORE_INVITES_INTERVAL=1800
@@ -47,4 +47,4 @@ URLS_LENGTH=6
 RATELIMIT_USER=5
 RATELIMIT_ADMIN=3
 
-# for more variables checkout the docs
\ No newline at end of file
+# for more variables checkout the docs