Using a Private WordPress Registry in ACK

When deploying WordPress on Alibaba Cloud ACK (Container Service for Kubernetes) using the official Anolis OS-based image, we encountered issues:

• New container instances failed during stress testing
• Uploaded images occasionally not displaying in WordPress backend

To resolve, we switched to a self-hosted private image registry (ACR).

Steps

1. Enable ACR

Enable Alibaba Cloud Container Registry (Personal Edition), set registry password.

2. Create Namespace & Repository

Create namespace (e.g., myspace), then create image repository.

3. Push WordPress Image from ECS

yum install -y docker
# Configure image accelerator in ACR console
sudo tee /etc/docker/daemon.json <<-'EOF'
{ "registry-mirrors": ["https://xxx.mirror.aliyuncs.com"] }
EOF
sudo systemctl restart docker
docker pull wordpress

Follow ACR repo commands to tag and push:

docker tag wordpress registry.cn-hangzhou.aliyuncs.com/myspace/wordpress:latest
docker push registry.cn-hangzhou.aliyuncs.com/myspace/wordpress:latest

4. Deploy in ACK

Create stateless application using the custom image. Important: set image pull secret, otherwise ACK cannot pull from private registry.

Results

• Container creation speed significantly improved
• WordPress image upload stability greatly improved
• No longer dependent on public image sources