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configuring_logging.md

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Configuring the Logging Stack via gardenlet Configurations

Enable the Logging

In order to install the Gardener logging stack, the logging.enabled configuration option has to be enabled in the Gardenlet configuration:

logging:
  enabled: true

From now on, each Seed is going to have a logging stack which will collect logs from all pods and some systemd services. Logs related to Shoots with testing purpose are dropped in the fluent-bit output plugin. Shoots with a purpose different than testing have the same type of log aggregator (but different instance) as the Seed. The logs can be viewed in the Plutono in the garden namespace for the Seed components and in the respective shoot control plane namespaces.

Enable Logs from the Shoot's Node systemd Services

The logs from the systemd services on each node can be retrieved by enabling the logging.shootNodeLogging option in the gardenlet configuration:

logging:
  enabled: true
  shootNodeLogging:
    shootPurposes:
    - "evaluation"
    - "deployment"

Under the shootPurpose section, just list all the shoot purposes for which the Shoot node logging feature will be enabled. Specifying the testing purpose has no effect because this purpose prevents the logging stack installation. Logs can be viewed in the operator Plutono! The dedicated labels are unit, syslog_identifier, and nodename in the Explore menu.

Configuring Central Vali Storage Capacity

By default, the central Vali has 100Gi of storage capacity. To overwrite the current central Vali storage capacity, the logging.vali.garden.storage setting in the gardenlet's component configuration should be altered. If you need to increase it, you can do so without losing the current data by specifying a higher capacity. By doing so, the Vali's PersistentVolume capacity will be increased instead of deleting the current PV. However, if you specify less capacity, then the PersistentVolume will be deleted and with it the logs, too.

logging:
  enabled: true
  vali:
    garden:
      storage: "200Gi"