JS7 JobScheduler

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  • JS7 can be set up for use with a Kubernetes Cluster using the Linux based JS7 container images for Docker® containers which ship with a current Alpine base image and OpenJDK.
  • Users deploy JS7 components products 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. Update the package database

    Code Block
    sudo yum check-update



  2. Install the dependencies

    Code Block
    sudo yum install -y yum-utils device-mapper-persistent-data lvm2



  3. Add and enable the Docker Repository for CentOS

    Code Block
    sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo



  4. Install the latest Docker version for CentOS

    Code Block
    sudo yum install docker-ce



  5. After successful installation the output will include the string  Complete!
    You may be prompted to accept the GPG key. This is to verify that the fingerprint matches. A fingerprint can look like this, if you consider the fingerprint being correct, accept it:

    Code Block
    060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35



  6. Manage Docker service
    With Docker being installed the systemd service has to be started. Start and enable Docker from systemd using the following commands:

    Code Block
    sudo systemctl start docker.service
sudo systemctl enable docker.service



  7. To check that Docker is up and running use the command:

    Code Block
    sudo systemctl status docker.service

Set up the Kubernetes Repository

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  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 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. 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:

    Code Block
    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:

    Code Block
    {
 "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

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



  8. Set up Pod network for the Kubernetes Cluster.

    Code Block
    kubectl get nodes



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

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