Creating a Kubernetes Cluster
Setting up a Kubernetes Cluster within netlab¶
To create a kubernetes cluster within the netlab. First you need to connect to it using VPN. The details are desribed in [[sources:netlab:connect_using_vpn|Introduction: Working with the Netlab]]
When connected to the VPN and logged into VCenter you can create a Kubernetes cluster from a pre-existing template. Since we need kubernetes we will start with a template which has pre-installed kubernetes software named microk8s. We will create a virtual machine from the corresponding template as an example.
Installing Kubernetes template¶
To do this, right-click "Templ_MicroK8S_ubuntu" in the left panel of the VMware vSphere Client and choose “New VM from this template” (you can also select the template and choose the corresponding action from the Actions drop-down menu). The asterisks contain the version numbers. Simply choose the latest.
Here appear some questions about the location of your virtual machine: - Select Name and Location All virtual machines should preferably start with the user name, so it's clear to whoever the machine belongs. - Expand the "Netlab-DC" directory. - Expand the “_Courses” directory and choose your course (Teachers have a personal folder under the “_Personal” directory”) - Choose Next. - Select a compute resource (Expand the Resource Pool "_Courses-RP") - Select the resource pool for your course and click next - Select storage "DataCluster-Students" and click next (or NIM01-Teachers if you are a teacher) - Make sure Customize and Power on are unchecked and click next - Review settings and click finish
Using your VM¶
Change settings before starting the VM the first time as following: - Select your VM and right-click for “Edit Settings” - Make sure the network adapter 1 is connected to the K8SVLAN (0220-K8SVLAN) and that “connect at power on” is selected. - Make sure the CD/DVD drive 1 “connect at power on” is unselected - Click OK to save changes
Then right-click “Open Remote Console” or choose this from the “Actions” menu and start your VM You can now login (Default login/password is ubuntu/ubuntu) your VM from: - The opened console via “launch web console”. - A virtual Linux VM can also be command-line operated remotely by SSH by installing and enabling openssh-server
Kubernetes Commands¶
Kubernetes has been pre-installed on the node. The installed package is microk8s from ubuntu. It’s a fully supported lightweight kubernetes distribution.
Microk8s can be managed via the cli using the microk8s utility
$sudo microk8s kubectl get nodes
You should get the following response (probably a newer version)
NAME STATUS ROLES AGE VERSION
ubuntu Ready
note that it will take some time for microk8s to fully boot.
When wanting to execute the commands without sudo, you have to add the ubuntu