diff --git a/postgresql_cluster/README.md b/postgresql_cluster/README.md
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index 0000000..747a61d
--- /dev/null
+++ b/postgresql_cluster/README.md
@@ -0,0 +1,20 @@
+# Project
+
+## Install Operator
+
+1. Add the repository
+
+```console
+helm repo add postgres-operator-charts https://opensource.zalando.com/postgres-operator/charts/postgres-operator
+```
+
+2. Install operator
+
+```console
+helm install postgres-operator postgres-operator-charts/postgres-operator -f values.yaml
+```
+
+3. Others
+
+https://postgres-operator.readthedocs.io/en/latest/quickstart/#helm-chart
+
diff --git a/postgresql_cluster/k8s-psql.yaml b/postgresql_cluster/k8s-psql.yaml
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+++ b/postgresql_cluster/k8s-psql.yaml
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+apiVersion: "acid.zalan.do/v1"
+kind: postgresql
+metadata:
+  name: myapp-psql-cluster
+spec:
+  volume:
+    size: 1Gi
+  numberOfInstances: 2
+  users:
+    psql_admin: # database owner
+      - superuser
+      - createdb
+    psql_user: [] # role for application psql_test
+  databases:
+    psql_test: psql_admin # dbname: owner
+  postgresql:
+    version: "17"
diff --git a/postgresql_cluster/values.yaml b/postgresql_cluster/values.yaml
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index 0000000..e69de29