This tutorial explains how to use a Kubernetes system to deploy a cloud instance for your Model Asset Exchange (MAX) model. The Kubernetes service lets you easily scale the containerized model from supporting a low rate of queries to production-level queries. The free IBM Cloud Kubernetes Service is limited to 1 worker, but this works fine for this application. Let’s get started!
If you are not familiar with the Model Asset Exchange, this introductory article provides a good overview.
Additionally, you need the following:
- An IBM Cloud account. You can sign up for a free account.
- An available Kubernetes cluster on your IBM Cloud account. The free cluster type will suffice. Create a Kubernetes cluster from the IBM Cloud catalog.
- The IBM Cloud command-line interface (CLI) installed. After creating a Cloud account and a Kubernetes cluster, you must communicate with the cluster using your local machine. Installation instructions are available, or you can perform a web search for ‘IBM Cloud CLI.’
With the prerequisites available, it should take you approximately 20 minutes to complete this tutorial.
This tutorial consists of the following steps:
- Accessing the Kubernetes cluster
- Deploying the MAX model
A troubleshooting section can be found at the end of this tutorial.
Step 1. Accessing the Kubernetes cluster
With an IBM Cloud account available, a Kubernetes cluster created, and the Cloud CLI installed (see Prerequisites), the actual deployment step itself is the easiest part. Begin by establishing the connection between your local machine and the Kubernetes cluster.
Use the CLI to log in to IBM Cloud on your local machine and specify what cluster you are targeting in the cloud. All of these instructions are also available under the Access tab on the online page of your Kubernetes cluster. Go to this Access tab to ensure that you are working with the most up-to-date instructions.
Now, execute the instructions.
Log in to the cluster from your local machine.
ibmcloud login -a https://cloud.ibm.com
Set the IBM Cloud region to the Kubernetes Service region that you selected when creating your cluster. The example cluster is in US South, but you can find information on other regions.
ibmcloud ks region-set us-south
Get the command to set the environment variable and download the Kubernetes configuration files to the cluster.
Note: Replace the last argument (
max-deployment-cluster) with the name you gave your Kubernetes cluster.
ibmcloud ks cluster-config max-deployment-cluster
Copy the output from the previous command and paste it in your terminal. The command starts with
export KUBECONFIG=.... This command must be run because it sets the required
Verify that you can connect to your cluster by listing your worker nodes. The
kubectlcommands are part of the Kubernetes CLI, which was installed in the same process as the IBM Cloud CLI. If the
command not found, you must install the Kubernetes CLI plug-in separately. More information on installing the plug-in separately can be found in the Troubleshooting section at the end of this tutorial.
kubectl get nodes
You are now ready for the final step of the deployment.
Step 2. Deploying the MAX model
The actual deployment process is short. Now that the connection with the remote Kubernetes cluster has been set up, you only have to apply the model’s configuration file to the Kubernetes cluster to get the API up and running.
Let’s download the model’s repository, which contains the YAML configuration file.
Clone the MAX-Model repository from GitHub. The following code shows how to do this for the MAX-Object-Detector, but you can replace
MAX-Object-Detectorwith whichever MAX Model you want to use.
git clone https://github.com/IBM/MAX-Object-Detector.git
Find the .yaml file in the downloaded directory.
cd MAX-Object-Detector ls *.yaml
Apply the configuration file to your Kubernetes cluster. Again, replace the
max-object-detector.yamlwith the .yaml file corresponding to your model. The following command deploys the model.
kubectl apply -f ./max-object-detector.yaml
After the model is deployed (give it some time), find the public IP address and port that the API is served on.
The public IP
ibmcloud cs workers mycluster
max-object-detectorwith the service name corresponding to your model.
kubectl describe service max-object-detector | grep NodePort
Navigate to the
http://<PUBLIC_IP>:<PORT>address in your browser. You should find the API front end as shown in the following image.
This means that the MAX model has been successfully deployed. Congratulations!
Some useful commands
# Show the log of all events kubectl get events # Show all pods kubectl get pods # Show all services kubectl get services # Show all deployments kubectl get deployments # Show the details of a service kubectl describe service SERVICE_NAME # Show the details of a node kubectl describe node NODE_NAME # Delete a service kubectl delete services SERVICE_NAME # Delete a deployment kubectl delete deployment DEPLOYMENT_NAME # Debugging a pod kubectl logs POD_NAME
IBM Cloud CLI:
# Show all clusters ibmcloud cs clusters # Show the workers of a specific cluster ibmcloud cs workers CLUSTER_NAME
Scaling a Kubernetes-powered application beyond the 2vCPU and 4 GB RAM specifications of the free cluster is as easy as clicking a button. Adding worker nodes (computation units) or specifying advanced cluster parameters (for example, more CPU or RAM) can be done easily from the Cloud Dashboard. However, you must upgrade to a standard cluster to access these.
Additionally, with more worker nodes, a single node’s public IP address does not suffice. Therefore, services like Ingress and Loadbalancer must be added as well. Exposing a public IP address on the deployment level instead of on the node level with the Loadbalancer can be set up in a few easy steps as demonstrated below.
Show the existing deployments and note the deployment name.
kubectl get deployments
With the deployment name, you can expose this deployment to a public IP address and port by using the following command. Replace
<DEPLOYMENT_NAME>with the name of the deployment, and replace
<SERVICE_NAME>with a custom name for your microservice. The
target-portflag points to the port of the running container, which is set to 5000 by default for MAX models. The port that you want to expose on the public IP address can be set with the
portflag. Here, it’s specified as
kubectl expose deployment <DEPLOYMENT_NAME> --port=80 --target-port=5000 --name=<SERVICE_NAME> --type=LoadBalancer --load-balancer-ip=''
The public IP and port are now being configured as part of the service. When done (it can be a couple of minutes), the external IP address shows up in the output of the following command.
kubectl get service --watch
You can verify that your service is up and running by typing the IP address and port in the browser like
More information can be found in the Deploy a MAX model-serving microservice on IBM Cloud Kubernetes Service GitHub repository.
An easy way to detect general issues with your Kubernetes cluster is to visit the Kubernetes Dashboard on IBM Cloud. Any critical or pending worker nodes are highlighted. In addition, you can run the following commands in the terminal.
Check Kubernetes events
kubectl get events
Get the logs for a pod
kubectl logs POD_NAME
Memory issues and killed containers
When trying to deploy a model with above-average memory requirements (for example, the MAX-Image-Resolution-Enhancer), you will run into a
TypeError: Failed to fetch error message. Although the front end is still responsive, this error often means that the container was killed and restarted due to exceeding the memory limit after posting an input image. In this case, you must upgrade to a standard Kubernetes cluster to choose the specifications of the worker nodes. Increasing the resources of the node solves this issue.
Can’t find the kubectl command
Most likely, this means that you are working with an older version of the IBM Cloud CLI for which the Kubernetes CLI was not included in the package. Verify that the
container-service/kubernetes-service plug-in is not present by running the
ibmcloud plugin list command. Run the
ibmcloud plugin install container-service command to install the plug-in, or reinstall the IBM Cloud CLI. You can find more information on the official Kubernetes page or on the IBM Cloud CLI page.
This tutorial illustrates how to deploy a model container from the Model Asset Exchange to IBM Cloud using Kubernetes by following two easy steps: accessing the Kubernetes cluster and deploying the MAX model.