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Copy file name to clipboardExpand all lines: machine_configuration/machine-configs-configure.adoc
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You can use the tasks in this section to create `MachineConfig` objects that modify files, systemd unit files, and other operating system features running on {product-title} nodes. For more ideas on working with machine configs, see content related to link:https://access.redhat.com/solutions/3868301[updating] SSH authorized keys, xref:../security/container_security/security-container-signature.adoc#security-container-signature[verifying image signatures], link:https://access.redhat.com/solutions/4727321[enabling SCTP], and link:https://access.redhat.com/solutions/5170251[configuring iSCSI initiatornames] for {product-title}.
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{product-title} supports link:https://coreos.github.io/ignition/configuration-v3_2/[Ignition specification version 3.2]. All new machine configs you create going forward should be based on Ignition specification version 3.2. If you are upgrading your {product-title} cluster, any existing Ignition specification version 2.x machine configs will be translated automatically to specification version 3.2.
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{product-title} supports link:https://coreos.github.io/ignition/configuration-v3_4/[Ignition specification version 3.4]. You should base all new machine configs you create going forward on Ignition specification version 3.4. If you are upgrading your {product-title} cluster, any existing machine configs with a previous Ignition specification will be translated automatically to specification version 3.4.
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There might be situations where the configuration on a node does not fully match what the currently-applied machine config specifies. This state is called _configuration drift_. The Machine Config Daemon (MCD) regularly checks the nodes for configuration drift. If the MCD detects configuration drift, the MCO marks the node `degraded` until an administrator corrects the node configuration. A degraded node is online and operational, but, it cannot be updated. For more information on configuration drift, see xref:../machine_configuration/index.adoc#machine-config-drift-detection_machine-config-overview[Understanding configuration drift detection].
Copy file name to clipboardExpand all lines: modules/machine-config-overview.adoc
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* MCO is only supported for writing to files in `/etc` and `/var` directories, although there are symbolic links to some directories that can be writeable by being symbolically linked to one of those areas. The `/opt` and `/usr/local` directories are examples.
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* Ignition is the configuration format used in MachineConfigs. See the link:https://coreos.github.io/ignition/configuration-v3_2/[Ignition Configuration Specification v3.2.0] for details.
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* Ignition is the configuration format used in MachineConfigs. See the link:https://coreos.github.io/ignition/configuration-v3_4/[Ignition Configuration Specification v3.4.0] for details.
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* Although Ignition config settings can be delivered directly at {product-title} installation time, and are formatted in the same way that MCO delivers Ignition configs, MCO has no way of seeing what those original Ignition configs are. Therefore, you should wrap Ignition config settings into a machine config before deploying them.
Copy file name to clipboardExpand all lines: modules/rhcos-add-extensions.adoc
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spec:
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config:
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ignition:
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version: 3.2.0
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version: 3.4.0
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extensions:
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- usbguard
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EOF
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[source,terminal]
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NAME GENERATEDBYCONTROLLER IGNITIONVERSION AGE
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80-worker-extensions 3.2.0 57s
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80-worker-extensions 3.4.0 57s
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----
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. Check that the new machine config is now applied and that the nodes are not in a degraded state. It may take a few minutes. The worker pool will show the updates in progress, as each machine successfully has the new machine config applied:
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