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+## How to build images and apply
+
+### Operator
+
+1. Build operator image and push to your dockerhub.
+
+```
+docker build -t {your repo}/mysql-operator:{your tag} . && docker push {your repo}/mysql-operator:{your tag}
+```
+
+2. Add radondb mysql helm repo.
+
+```
+helm repo add radondb https://radondb.github.io/radondb-mysql-kubernetes/
+```
+
+3. Install/Update operator using your image.
+
+```
+helm upgrade demo radondb/mysql-operator --install --set manager.image={your repo}/mysql-operator --set manager.tag={your tag}
+```
+
+### Sidecar
+
+1. Build sidecar image and push to your dockerhub.
+
+```
+docker build -f Dockerfile.sidecar -t {your repo}/mysql-sidecar:{your tag} . && docker push {your repo}/mysql-sidecar:{your tag}
+```
+
+2. Create a sample cluster if not exist.
+
+```
+kubectl apply -f https://github.com/radondb/radondb-mysql-kubernetes/releases/latest/download/mysql_v1alpha1_mysqlcluster.yaml
+```
+
+3. Apply image to existing cluster.
+
+```
+kubectl patch mysql sample -p '{"spec": {"podPolicy": {"sidecarImage": "{your repo}/mysql-sidecar:{your tag}"}}}' --type=merge
+```
+
+> This example is for cluster named `sample`, you can modify as your cluster.
+