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• JS7 can be set up for use with a Kubernetes cluster. Using Cluster using the Linux based JS7 images for Docker® containers which ship with a current Alpine base image and OpenJDK.
  • Docker® images for JS7 are publicly available from https://hub.docker.com/r/sosberlin/js7.
  • Instructions on how to run containers for JS7 components can be found from the JS7 - Installation for Docker Containers article series.
• Users deploy JS7 components by creating a Kubernetes deployment object from a YAML deployment YAML file, for details see see JS7 - How to deploy to a Kubernetes Cluster

There are several ways how to set up a Kubernetes clusterCluster. Find an example for the basic steps to install a Kubernetes cluster Cluster on CentOS  7 from the following chapters.

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kubelet is the first core module to be installed on every Kubernetes cluster Cluster node. Use the following command:

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1. kubeadm is the next core module that has to be installed. Use the following command:

   Code Block
   sudo yum install -y kubeadm

   Note that kubeadm automatically installs kubectl as a dependency.

   
   
   

2. Disable swap by use of the below commands:
   

   Code Block
   sudo swapoff -a sudo sed -i '/ swap / s/^/#/' /etc/fstab

Initialize kubeadm and start the Kubernetes

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Cluster

1. When initializing kubeadm directly then kubeadm might raise the error:

   Code Block
   Some fatal errors occurred: [ERROR CRI]: container runtime is not running Status from runtime service failed” err=”rpc error: code = Unimplemented desc = unknown service runtime.v1alpha2.RuntimeService”

   
   
   

2. To resolve the above problem users should delete the config.tomal file and restart containerd using the following commands:
   

   Code Block
   sudo rm /etc/containerd/config.toml systemctl restart containerd

   
   
   

3. Initialize kubeadm, create required directories and manage Kubernetes cluster Cluster configuration:

   Code Block
   sudo kubeadm init mkdir $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config export KUBECONFIG=/etc/kubernetes/admin.conf

   
   
   

4. Enable and restart Docker and Kubernetes services from systemd.

   Code Block
   sudo systemctl enable docker.service sudo service kubelet restart sudo chown -R centos:centos kubernetes/

   
   
   

5. Set up pod Pod network for the Kubernetes clusterCluster.

   Code Block
   kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml kubectl get nodes

   
   
   

With the above steps the setup of the Kubernetes cluster Cluster is completed. In a next step users can create the Kubernetes YAML deployment files to deploy JS7 components to the Kubernetes clusterCluster.

Further Resources

• JS7 - How to deploy to a Kubernetes Cluster

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