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• JS7 can be set up for use with a Kubernetes 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 file, for details see JS7 - How to deploy to a Kubernetes Cluster

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

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   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:
   

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

   
   
   

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

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   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.

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

   
   
   

5. To initialize the CNI plugin update your CNI plugins and edit the CNI config files. Use the following command to create the file and open it for editing:
   

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   sudo vi /etc/cni/net.d/10-containerd-net.conflist

   
   
   

6. Once the file is open, press the I key to enter insert mode and paste the following contents:
   

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   { "cniVersion": "1.0.0", "name": "containerd-net", "plugins": [ { "type": "bridge", "bridge": "cni0", "isGateway": true, "ipMasq": true, "promiscMode": true, "ipam": { "type": "host-local", "ranges": [ [{ "subnet": "10.88.0.0/16" }], [{ "subnet": "2001:db8:4860::/64" }] ], "routes": [ { "dst": "0.0.0.0/0" }, { "dst": "::/0" } ] } }, { "type": "portmap", "capabilities": {"portMappings": true}, "externalSetMarkChain": "KUBE-MARK-MASQ" } ] }

   Once pasted, press escape to exit insert mode. Then enter :x to save the file and exit.
   
   
   

7. We have to taint this node. We can do this by using the kubectl taint command

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   kubectl taint nodes <name-node-master> node-role.kubernetes.io/control-plane:NoSchedule-

   
   
   

8. Set up Pod network for the Kubernetes Cluster.

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   kubectl get nodes

   
   
   

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