Using a Configuration File

2 Using a Configuration File

Important:

The software described in this documentation is either in Extended Support or Sustaining Support. See Oracle Open Source Support Policies for more information.

We recommend that you upgrade the software described by this documentation as soon as possible.

To simplify creating and managing environments and modules, you can use a configuration file. The configuration file includes all information about the environments and modules you want to create. Using a configuration file saves repeated entries of Platform CLI command options.

You can use a configuration file using the --config-file option with any Platform CLI command as it is a global command option. When you use the --config-file option with a Platform CLI command, any other command line options are ignored, with the exception of the --force option. Only the information contained in the configuration file is used with an olcnectl command.

The following sections contain information on writing a configuration file and using a configuration file create and remove environments and modules. There are more uses for the configuration file than this chapter describes. The use cases described in this chapter are the most common ways to use a configuration file.

Creating a Configuration File

The configuration file must be valid YAML with a file extension of yaml or yml. The basic format of components in the configuration file is:

environments:
  - environment-name: name
    globals:
      key: value
    modules:
      - module: name
        name: name
        args:
          key: value
      - module: name
        name: name
        args:
          key: value
  - environment-name: name
    globals:
      key: value
    modules:
      - module: name
        name: name
        args:
          key: value
      - module: name
        name: name
        args:
          key: value

The olcnectl template command is useful to create a YAML file that contains some basic configuration options to start a configuration file for your environment.

olcnectl template

This command creates a file named config-file-template.yaml in the local directory. You can edit this file to suit your needs.

The configuration file should contain key: value pairs for olcnectl command options. For example, when creating an environment, you might use an olcnectl command like:

olcnectl environment create \
--api-server 127.0.0.1:8091 \
--environment-name myenvironment \
--secret-manager-type vault \
--vault-token s.3QKNuRoTqLbjXaGBOmO6Psjh \
--vault-address https://192.0.2.20:8200 \
--update-config

To represent this same information in YAML format in the configuration file, you would use:

environments:
  - environment-name: myenvironment
    globals:
      api-server: 127.0.0.1:8091
      secret-manager-type: vault
      vault-token: s.3QKNuRoTqLbjXaGBOmO6Psjh 
      vault-address: https://192.0.2.20:8200 
      update-config: true

Notice that the olcnectl environment create command options to create the environment map directly to the YAML key: value pairs.

When you write the modules section, you can use any olcnectl module command option that relates to modules. That is, any olcnectl module command option that can be used with a module can be included in the module section. The args section for a module should only contain the options available with the olcnectl module create command. Any other options should be under the main module set of options.

In this example, the --generate-scripts and --force options are not valid with the olcnectl module create command, but they are valid options for the olcnectl module validate or olcnectl module uninstall options. The generate-scripts and force options should not be added as module args, instead they should be listed under the module: kubernetes section.

...
    modules:
      - module: kubernetes
        name: mycluster
        generate-scripts: true
        force: true
        args:
          kube-version: 1.25.16
          container-registry: container-registry.oracle.com/olcne
          load-balancer: lb.example.com:6443
          control-plane-nodes: 
            - control1.example.com:8090
            - control2.example.com:8090
            - control3.example.com:8090
          worker-nodes:
            - worker1.example.com:8090
            - worker2.example.com:8090
            - worker3.example.com:8090
          selinux: enforcing
          restrict-service-externalip: true
          restrict-service-externalip-ca-cert: /etc/olcne/certificates/restrict_external_ip/ca.cert
          restrict-service-externalip-tls-cert: /etc/olcne/certificates/restrict_external_ip/node.cert
          restrict-service-externalip-tls-key: /etc/olcne/certificates/restrict_external_ip/node.key

If you do not provide all mandatory options for a command, you are prompted for them when you use the configuration file with olcnectl. If you do not supply a value for a key, the default for that olcnectl command option is used, or if there is no default value, that key is ignored. If you add key values that are not valid, an error is displayed to help you correct the invalid option. If you add keys that are not valid, they are ignored.

Do not include the --config-file option for any olcnectl commands in the configuration file. This option is ignored and cannot be used in a configuration file.

The order of the components in the YAML file is important. The components should be in the same order as you would create them using the Platform CLI.

For example, this file creates two environments, the first environment includes only the Kubernetes module. The second environment includes the Kubernetes module, the Operator Lifecycle Manager module, the Istio module, and finally, the Oracle Cloud Infrastructure Cloud Controller Manager module. Both environments and all modules can be created and installed using a single set of olcnectl commands.

environments:
  - environment-name: myenvironment1
    globals:
      api-server: 127.0.0.1:8091
      secret-manager-type: file
      olcne-ca-path: /etc/olcne/certificates/ca.cert
      olcne-node-cert-path: /etc/olcne/certificates/node.cert
      olcne-node-key-path:  /etc/olcne/certificates/node.key
    modules:
      - module: kubernetes
        name: mycluster1
        args:
          container-registry: container-registry.oracle.com/olcne
          load-balancer: lb.example.com:6443
          control-plane-nodes: 
            - control1.example.com:8090
            - control2.example.com:8090
            - control3.example.com:8090
          worker-nodes:
            - worker1.example.com:8090
            - worker2.example.com:8090
            - worker3.example.com:8090
          selinux: enforcing
          restrict-service-externalip: true
          restrict-service-externalip-ca-cert: /etc/olcne/certificates/restrict_external_ip/ca.cert
          restrict-service-externalip-tls-cert: /etc/olcne/certificates/restrict_external_ip/node.cert
          restrict-service-externalip-tls-key: /etc/olcne/certificates/restrict_external_ip/node.key
  - environment-name: myenvironment2
    globals:
      api-server: 127.0.0.1:8091
      secret-manager-type: file
      olcne-ca-path: /etc/olcne/certificates/ca.cert
      olcne-node-cert-path: /etc/olcne/certificates/node.cert
      olcne-node-key-path:  /etc/olcne/certificates/node.key
    modules:
      - module: kubernetes
        name: mycluster2
        args:
          container-registry: container-registry.oracle.com/olcne
          load-balancer: lb.example.com:6443
          control-plane-nodes: 
            - control4.example.com:8090
            - control5.example.com:8090
            - control6.example.com:8090
          worker-nodes:
            - worker4.example.com:8090
            - worker5.example.com:8090
            - worker6.example.com:8090
          selinux: enforcing
          restrict-service-externalip: true
          restrict-service-externalip-ca-cert: /etc/olcne/certificates/restrict_external_ip/ca.cert
          restrict-service-externalip-tls-cert: /etc/olcne/certificates/restrict_external_ip/node.cert
          restrict-service-externalip-tls-key: /etc/olcne/certificates/restrict_external_ip/node.key
      - module: operator-lifecycle-manager
        name: myolm
        args:
          olm-kubernetes-module: mycluster2
      - module: istio
        name: myistio
        args: 
          istio-kubernetes-module: mycluster2 
      - module: oci-ccm
        name: myoci
        args: 
          oci-ccm-kubernetes-module: mycluster2 
          oci-region: us-ashburn-1 
          oci-tenancy: ocid1.tenancy.oc1..unique_ID
          oci-compartment: ocid1.compartment.oc1..unique_ID
          oci-user: ocid1.user.oc1..unique_ID
          oci-fingerprint: b5:52:...
          oci-private-key-file: /home/opc/.oci/oci_api_key.pem 
          oci-vcn: ocid1.vcn.oc1..unique_ID 
          oci-lb-subnet1: ocid1.subnet.oc1..unique_ID

Installing Using a Configuration File

This section contains an example of using a configuration file to create an environment and deploy Kubernetes into it.

The configuration file for this is named myenvironment.yaml and contains:

environments:
  - environment-name: myenvironment
    globals:
      api-server: 127.0.0.1:8091
      secret-manager-type: file
      olcne-ca-path: /etc/olcne/certificates/ca.cert
      olcne-node-cert-path: /etc/olcne/certificates/node.cert
      olcne-node-key-path:  /etc/olcne/certificates/node.key
    modules:
      - module: kubernetes
        name: mycluster
        args:
          container-registry: container-registry.oracle.com/olcne
          load-balancer: lb.example.com:6443
          control-plane-nodes: 
            - control1.example.com:8090
            - control2.example.com:8090
            - control3.example.com:8090
          worker-nodes:
            - worker1.example.com:8090
            - worker2.example.com:8090
            - worker3.example.com:8090
          selinux: enforcing
          restrict-service-externalip: true
          restrict-service-externalip-ca-cert: /etc/olcne/certificates/restrict_external_ip/ca.cert
          restrict-service-externalip-tls-cert: /etc/olcne/certificates/restrict_external_ip/node.cert
          restrict-service-externalip-tls-key: /etc/olcne/certificates/restrict_external_ip/node.key

Use the same commands as you would usually use to create an environment and deploy the Kubernetes module, but instead of passing all the command options using the Platform CLI, simply provide the location of the configuration file.

To create the environment and deploy Kubernetes, on the operator node:

Use the olcnectl environment create command with the --config-file option:
```
olcnectl environment create \
--config-file myenvironment.yaml 
```
The environment is created and ready to use to install the Kubernetes module. If you have multiple environments set up in your configuration file, they are all created using this one step.
Use the olcnectl module create command to create the Kubernetes module.
```
olcnectl module create \
--config-file myenvironment.yaml 
```
If you have multiple modules set up in your configuration file, they are all created using this one step.
You should also validate the module is able to be installed on the nodes. Use the olcnectl module validate command to validate the module.
```
olcnectl module validate \
--config-file myenvironment.yaml 
```
If you have multiple modules set up in your configuration file, they are all validated.
The last step is to install the module. Use the olcnectl module install command to install the module.
```
olcnectl module install \
--config-file myenvironment.yaml 
```
If you have multiple modules set up in your configuration file, they are all installed.

You can verify the Kubernetes module is deployed and the nodes are set up using the olcnectl module instances command.

olcnectl module instances \
--config-file myenvironment.yaml 
INSTANCE                      MODULE                    	STATE    
control1.example.com:8090     node                      	installed
control2.example.com:8090     node                      	installed
control3.example.com:8090     node                      	installed
worker1.example.com:8090      node                      	installed
worker2.example.com:8090      node                      	installed
worker3.example.com:8090      node                      	installed
mycluster                     kubernetes                	installed

Adding Modules or Environments Using a Configuration File

If you want to add modules or environments to your deployment, add them to your configuration file, then run the olcnectl commands to add them to your deployment. For example, to add the Operator Lifecycle Manager module to an existing Kubernetes deployment, create a file similar to the following. This file is the same as that used in Installing Using a Configuration File, to create an environment and deploy Kubernetes, with the addition of the Operator Lifecycle Manager module.

environments:
  - environment-name: myenvironment
    globals:
      api-server: 127.0.0.1:8091
      secret-manager-type: file
      olcne-ca-path: /etc/olcne/certificates/ca.cert
      olcne-node-cert-path: /etc/olcne/certificates/node.cert
      olcne-node-key-path:  /etc/olcne/certificates/node.key
    modules:
      - module: kubernetes
        name: mycluster
        args:
          container-registry: container-registry.oracle.com/olcne
          load-balancer: lb.example.com:6443
          control-plane-nodes: 
            - control1.example.com:8090
            - control2.example.com:8090
            - control3.example.com:8090
          worker-nodes:
            - worker1.example.com:8090
            - worker2.example.com:8090
            - worker3.example.com:8090
          selinux: enforcing
          restrict-service-externalip: true
          restrict-service-externalip-ca-cert: /etc/olcne/certificates/restrict_external_ip/ca.cert
          restrict-service-externalip-tls-cert: /etc/olcne/certificates/restrict_external_ip/node.cert
          restrict-service-externalip-tls-key: /etc/olcne/certificates/restrict_external_ip/node.key
      - module: operator-lifecycle-manager
        name: myolm
        args:
          olm-kubernetes-module: mycluster

Install the Operator Lifecycle Manager module using the olcnectl module commands.

olcnectl module create \
--config-file myenvironment.yaml 
olcnectl module validate \
--config-file myenvironment.yaml 
olcnectl module install \
--config-file myenvironment.yaml

The additional Operator Lifecycle Manager module is installed into the existing Kubernetes cluster in the environment.

Uninstalling Specific Modules or Environments Using a Configuration File

As the Platform API Server acts upon all the information contained in a configuration file, if you want to remove specific components from your deployment, while leaving other components, you need to create a separate configuration file with only the components you want to remove. The new configuration file includes only the information about the environment and module(s) you want to uninstall.

For example, to remove the Operator Lifecycle Manager module and not the Kubernetes module in an environment, create a file similar to the following. This file is the same as used in Adding Modules or Environments Using a Configuration File, without the information about the Kubernetes module. Specify the environment in which the modules are deployed, and only the modules you want to remove.

environments:
  - environment-name: myenvironment
    globals:
      api-server: 127.0.0.1:8091
      secret-manager-type: file
      olcne-ca-path: /etc/olcne/certificates/ca.cert
      olcne-node-cert-path: /etc/olcne/certificates/node.cert
      olcne-node-key-path:  /etc/olcne/certificates/node.key
    modules:
      - module: operator-lifecycle-manager
        name: myolm
        args:
          olm-kubernetes-module: mycluster

The filename in this example is myenvironment-olm.yaml.

Important:

Make sure you confirm the configuration file is correct before you use it to uninstall modules in order to maintain the integrity of your deployment.

Uninstall the Operator Lifecycle Manager module using the olcnectl module uninstall command. Remember to use the --force option to make sure modules are removed in the correct order by the Platform API Server.

olcnectl module uninstall \
--config-file myenvironment-olm.yaml \
--force

The Operator Lifecycle Manager module is uninstalled from the environment, while leaving the Kubernetes module untouched.

Scaling a Cluster Using a Configuration File

The information in this section shows you how to scale a Kubernetes cluster using a configuration file. For more information about scaling a cluster and preparing nodes, see Container Orchestration.

To scale a Kubernetes cluster using a configuration file, simply change the nodes listed in the Kubernetes module and use the olcnectl module update command to apply the changes to the module. For example, to add nodes to an existing cluster that has the following listed in the configuration file:

...
    modules:
      - module: kubernetes
        name: mycluster
        args:
          container-registry: container-registry.oracle.com/olcne
          load-balancer: lb.example.com:6443
          control-plane-nodes: 
            - control1.example.com:8090
            - control2.example.com:8090
            - control3.example.com:8090
          worker-nodes:
            - worker1.example.com:8090
            - worker2.example.com:8090
            - worker3.example.com:8090
...

Add the new nodes to the configuration file. In this case there are two additional control plane nodes and one additional worker node.

...
    modules:
      - module: kubernetes
        name: mycluster
        args:
          container-registry: container-registry.oracle.com/olcne
          load-balancer: lb.example.com:6443
          control-plane-nodes: 
            - control1.example.com:8090
            - control2.example.com:8090
            - control3.example.com:8090
            - control4.example.com:8090
            - control5.example.com:8090
          worker-nodes:
            - worker1.example.com:8090
            - worker2.example.com:8090
            - worker3.example.com:8090
            - worker4.example.com:8090
...

Use the olcnectl module update command to scale up the cluster.

olcnectl module update \
--config-file myenvironment.yaml

The Platform API Server backs up the cluster and adds the new nodes.

To scale down a cluster, perform the same steps, except delete the information about the nodes you want to remove from the cluster from the configuration file.

Updating and Upgrading Using a Configuration File

You can use the configuration file when you update or upgrade modules. For more information about updating or upgrading modules, see Updates and Upgrades.

To update all modules to the latest available errata release, use the olcnectl module update command.

olcnectl module update \
--config-file myenvironment.yaml

To upgrade modules to the latest available release, set the version for the module in the configuration file and use the olcnectl module update command. For example, to upgrade the Kubernetes module to the latest version, add kube-version: 1.25.16, and for the Istio module, add istio-version: 1.16.7:

...
    modules:
      - module: kubernetes
        name: mycluster
        args:
          container-registry: container-registry.oracle.com/olcne
          load-balancer: lb.example.com:6443
          kube-version: 1.25.16
          control-plane-nodes: 
            - control1.example.com:8090
            - control2.example.com:8090
            - control3.example.com:8090
          worker-nodes:
            - worker1.example.com:8090
            - worker2.example.com:8090
            - worker3.example.com:8090
          selinux: enforcing
          restrict-service-externalip: true
          restrict-service-externalip-ca-cert: /etc/olcne/certificates/restrict_external_ip/ca.cert
          restrict-service-externalip-tls-cert: /etc/olcne/certificates/restrict_external_ip/node.cert
          restrict-service-externalip-tls-key: /etc/olcne/certificates/restrict_external_ip/node.key
    modules:
      - module: istio
        name: myistio
        args:
          istio-kubernetes-module: mycluster
          istio-version: 1.16.7

Use the olcnectl module update command to upgrade the modules listed in the configuration file.

olcnectl module update \
--config-file myenvironment.yaml

Uninstalling Using a Configuration File

To use a configuration file to uninstall environments and modules, you should use the same olcnectl commands you would use to remove modules without using the file. That is, you should remove the modules first, then remove the environment.

Use the --force option of the olcnectl module uninstall command to make sure the module dependency order is maintained internally by the Platform API Server when you remove modules from an environment.

olcnectl module uninstall \
--config-file myenvironment.yaml \
--force

All the modules in the configuration file are removed.

Remove the environment using:

olcnectl environment delete \
--config-file myenvironment.yaml

The environment is removed.