diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -136,6 +136,8 @@
     env_file:
       - ./env/common_python.env
       - ./env/scheduler-db.env
+    volumes:
+      - "./services/dbs/init-guest-user-db.sh:/docker-entrypoint-initdb.d/init-user-db.sh:ro"
 
   swh-scheduler:
     image: swh/stack
@@ -239,6 +241,8 @@
     image: postgres:12
     env_file:
       - ./env/storage-db.env
+    volumes:
+      - "./services/dbs/init-guest-user-db.sh:/docker-entrypoint-initdb.d/init-user-db.sh:ro"
 
   swh-storage:
     image: swh/stack
@@ -282,6 +286,8 @@
     image: postgres:12
     env_file:
       - ./env/indexers-db.env
+    volumes:
+      - "./services/dbs/init-guest-user-db.sh:/docker-entrypoint-initdb.d/init-user-db.sh:ro"
 
   swh-idx-storage:
     image: swh/stack
@@ -306,6 +312,8 @@
     image: postgres:12
     env_file:
       - ./env/01-web-db.env
+    volumes:
+      - "./services/dbs/init-guest-user-db.sh:/docker-entrypoint-initdb.d/init-user-db.sh:ro"
 
   swh-web:
     build: ./
@@ -355,6 +363,8 @@
     image: postgres:12
     env_file:
       - ./env/deposit-db.env
+    volumes:
+      - "./services/dbs/init-guest-user-db.sh:/docker-entrypoint-initdb.d/init-user-db.sh:ro"
 
   swh-deposit:
     image: swh/stack
@@ -381,6 +391,8 @@
     image: postgres:12
     env_file:
       - ./env/vault-db.env
+    volumes:
+      - "./services/dbs/init-guest-user-db.sh:/docker-entrypoint-initdb.d/init-user-db.sh:ro"
 
   swh-vault:
     image: swh/stack
diff --git a/docker/services/dbs/init-guest-user-db.sh b/docker/services/dbs/init-guest-user-db.sh
new file mode 100644
--- /dev/null
+++ b/docker/services/dbs/init-guest-user-db.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -e
+
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<EOF
+    CREATE ROLE guest LOGIN PASSWORD 'guest';
+EOF