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Chapter 1. About the default MicroShift configuration file

To view or customize the built-in settings for MicroShift, you can reference the default configuration YAML file or run microshift show-config. The file lists the settings that apply when no config.yaml file is present.

1.1. Configuring Red Hat Device Edge
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The MicroShift configuration file, config.yaml, centralizes Red Hat Device Edge and service settings for your single-node edge platform. To create a custom configuration, you can copy the installed config.yaml.default file and rename it to config.yaml.

MicroShift and Red Hat Enterprise Linux (RHEL) work together to bring a lighter-weight, single-node Kubernetes to the edge. This combination means that there is a single node that is both control-plane and worker. It also means that the operating system handles many functions. You add features by installing optional RPMs or Operators. In many cases, you must configure the operating system or other resources in addition to the MicroShift service.

Bringing these components together is the MicroShift configuration file, config.yaml. The configuration file customizes your application platform and enables advanced functionality.

1.1.1. Using the default configuration file
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A config.yaml.default file is installed automatically. You can copy this file, rename it config.yaml, and use it as the starting point for your custom configuration.

1.1.2. Configuring platform features
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You can use the MicroShift configuration file to control and customize platform features. For example:

Ingress
Ingress is available by default, but you can add advanced functions such as TLS and route admission specifications by using parameters in the MicroShift configuration file.
Storage
If you do not need storage, you can disable the built-in storage provider by using the MicroShift configuration file. If you do want to use the built-in storage provider, you must make your adjustments in the lvmd.config file. The role of the MicroShift configuration file in this case is to set whether you use the default storage provider.
Advanced networking functions
Advanced networking functions, such as using multiple networks. The Multus package is an installable RPM, but you set up access by using the MicroShift configuration file to set parameters. In addition, you must configure network settings on your networks through the host.
Note

You can also add features that operate without configurations to the MicroShift config.yaml file. For example, you can install and configure GitOps for application management without configuring MicroShift.

Note

If you want to make configuration changes or deploy applications through the MicroShift API with tools other than kustomize manifests, you must wait until the greenboot health checks have finished. This ensures that your changes are not lost if greenboot rolls your rpm-ostree system back to an earlier state.

1.2. The MicroShift configuration file
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At startup, MicroShift checks the system-wide /etc/microshift/ directory for a configuration file named config.yaml. If the configuration file does not exist in the directory, built-in default values are used to start the service.

You must use the MicroShift configuration file in combination with host and, sometimes, application and service settings. Ensure that you configure each function in tandem when you adjust settings for your MicroShift node.

For your convenience, a config.yaml.default file ready for your inputs is automatically installed.

1.2.1. Default settings
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Important

The Generic Device Plugin for MicroShift is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

When no config.yaml or configuration snippet exists, MicroShift uses built-in default values. To view these defaults, run microshift show-config.

The following example shows the default configuration settings.

Procedure

  • To see the default values, run the following command: 

    $ microshift show-config
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    Default values example output in YAML form

    apiServer:
  advertiseAddress: 10.44.0.0/32
  auditLog:
    maxFileAge: 0
    maxFileSize: 200
    maxFiles: 10
    profile: Default
  namedCertificates:
    - certPath: ""
      keyPath: ""
      names:
        - ""
  subjectAltNames: []
  tls:
    cipherSuites:
    minVersion: VersionTLS12
debugging:
  logLevel: "Normal"
dns:
  baseDomain: microshift.example.com
etcd:
  memoryLimitMB: 0
genericDevicePlugin:
    devices:
        - groups:
            - count: 1
              paths:
                - limit: 1
                  mountPath: /dev/ttyACM0
                  path: /dev/ttyACM0
                  permissions: mrw
                  readOnly: false
                  type: Device
              usbs:
                - product: ""
                  serial: ""
                  vendor: ""
          name: serial
    domain: device.microshift.io
    status: Disabled
ingress:
  accessLogging:
    destination:
      type:
      container:
        maxLength: 1024
      syslog:
        address: ""
        facility: ""
        maxLength: 1024
        port: 0
        type: ""
    httpCaptureCookies:
      - matchType: ""
        maxLength: 0
        name: ""
        namePrefix: ""
    httpCaptureHeaders:
      request:
        - maxLength: 0
          name: ""
      response:
        - maxLength: 0
          name: ""
    httpLogFormat: ""
    status: Disabled
  certificateSecret: router-certs-default
  clientTLS:
    allowedSubjectPatterns:
    clientCA:
      name: ""
    clientCertificatePolicy: ""
  defaultHTTPVersion: 1
  forwardedHeaderPolicy: ""
  httpCompression:
    mimeTypes:
      - ""
  httpEmptyRequestsPolicy: Respond
  httpErrorCodePages:
      name: ""
  listenAddress: []
  logEmptyRequests: Log
  ports:
    http: 80
    https: 443
  routeAdmissionPolicy:
    namespaceOwnership: InterNamespaceAllowed
    wildcardPolicy: WildcardPolicyAllowed
  status: Managed
  tlsSecurityProfile:
    type: Intermediate
  tuningOptions:
      clientFinTimeout: "1s"
      clientTimeout: "30s"
      headerBufferBytes: 0
      headerBufferMaxRewriteBytes: 0
      healthCheckInterval: "5s"
      maxConnections: 0
      serverFinTimeout: "1s"
      serverTimeout: "30s"
      threadCount: 0
      tlsInspectDelay: "5s"
      tunnelTimeout: "1h"
kubelet:
manifests:
  kustomizePaths:
    - /usr/lib/microshift/manifests
    - /usr/lib/microshift/manifests.d/*
    - /etc/microshift/manifests
    - /etc/microshift/manifests.d/*
network:
  clusterNetwork:
    - 10.42.0.0/16
  cniPlugin: ""
  multus:
    status: Disabled
  serviceNetwork:
    - 10.43.0.0/16
  serviceNodePortRange: 30000-32767
node:
  hostnameOverride: ""
  nodeIP: ""
  nodeIPv6: ""
storage:
  driver: ""
  optionalCsiComponents:
    - ""
telemetry:
  endpoint: https://infogw.api.openshift.com
  proxy: ""
  status: Enabled
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    where:

    apiserver.advertiseAddress
    Specifies the address of the service network.
    network.multus.status
    Specifies the status of the Multus Container Network Interface (CNI).
    node.nodeIP
    Specifies the IP address of the default route.
    storage.driver
    Specifies the storage driver to use. Default null value deploys Logical Volume Managed Storage (LVMS).
    storage.optionalCsiComponents
    Specifies the CSI components to deploy. Default null value deploys snapshot-controller.
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