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19 Script for Setting Up 1-node Kubernetes Cluster
20 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
22 The it/dep repo can be used for generating a simple script that can help setting up a
23 one-node Kubernetes cluster for dev and testing purposes. Related files are under the
24 **tools/k8s/bin** directory. Clone the repository on the target VM:
28 % git clone https://gerrit.o-ran-sc.org/r/it/dep
34 The generation of the script reads in the parameters from the following files:
36 - etc/env.rc: Normally no change needed for this file. If where the Kubernetes cluster runs
37 has special requirements, such as running private Docker registry with self-signed certificates,
38 or hostnames that can be only resolved via private /etc/hosts entries, such parameters are
39 entered into this file.
40 - etc/infra.rc: This file specifies the docker host, Kubernetes, and Kubernetes CNI versions.
41 If a version is left empty, the installation will use the default version that the OS package
42 management software would install.
43 - etc/openstack.rc: If the Kubernetes cluster is deployed on Open Stack VMs, this file specifies
44 parameters for accessing the APIs of the Open Stack installation. This is not supported in Amber
48 Generating Set-up Script
49 ^^^^^^^^^^^^^^^^^^^^^^^^
51 After the configurations are updated, the following steps will create a script file that can be
52 used for setting up a one-node Kubernetes cluster. You must run this command on a Linux machine
53 with the 'envsubst' command installed.
60 A file named **k8s-1node-cloud-init.sh** would now appear under the bin directory.
63 Setting up Kubernetes Cluster
64 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
66 The new **k8s-1node-cloud-init.sh** file is now ready for setting up the Kubernetes cluster.
68 It can be run from a root shell of an existing Ubuntu 16.04 or 18.04 VM. Running this script
69 will replace any existing installation of Docker host, Kubernetes, and Helm on the VM. The
70 script will reboot the machine upon successful completion. Run the script like this:
75 # ./k8s-1node-cloud-init.sh
77 This script can also be used as the user-data (a.k.a. cloud-init script) supplied to Open Stack
78 when launching a new Ubuntu 16.04 or 18.04 VM.
80 Upon successful execution of the script and reboot of the machine, when queried in a root shell
81 with the kubectl command the VM should display information similar to below:
85 # kubectl get pods --all-namespaces
86 NAMESPACE NAME READY STATUS RESTARTS AGE
87 kube-system coredns-5644d7b6d9-4gjp5 1/1 Running 0 103m
88 kube-system coredns-5644d7b6d9-pvsj8 1/1 Running 0 103m
89 kube-system etcd-ljitest 1/1 Running 0 102m
90 kube-system kube-apiserver-ljitest 1/1 Running 0 103m
91 kube-system kube-controller-manager-ljitest 1/1 Running 0 102m
92 kube-system kube-flannel-ds-amd64-nvjmq 1/1 Running 0 103m
93 kube-system kube-proxy-867v5 1/1 Running 0 103m
94 kube-system kube-scheduler-ljitest 1/1 Running 0 102m
95 kube-system tiller-deploy-68bf6dff8f-6pwvc 1/1 Running 0 102m