Relayd administration

The rudder-relayd service (added in 6.0) is part of the rudder-server-relay package and runs on all relays and root servers. It provides the relay API and handles inventories and reports forwarding to the root server from nodes.

Configuration

Relay configuration is stored in /opt/rudder/etc/relay:

  • main.conf contains general configuration. Its content is managed by the Rudder agent of the relay.

  • logging.conf contains logging information.

Relay also reads the following data files:

  • /var/rudder/lib/relay/nodeslist.json: contains information about the nodes behind a relay

  • /var/rudder/lib/ssl/allnodescerts.pem (only on root server): contains the certificates of all nodes managed by the root server

Configuration reload uses the reload API endpoint, which allows systemctl reload rudder-relayd to be synchronous (and ensure configuration is already applied when command returns).

Reloading relayd configuration reloads all data files and update properties from logging.conf but not the ones from main.conf. Changing properties in main.conf requires a restart to be taken into account.

Data files

Relayd operates on different data directories:

  • /var/rudder/inventories (on on simple relays): to forward inventories to upstream relay or root server. On root server, the webapp monitors this folder directly.

  • /var/rudder/reports: to forward reports to upstream relay, or, on root server, to parse and insert reports into the database.

  • /var/rudder/shared-files/: files shared between nodes

  • /var/rudder/configuration-repository/shared-files (read-only): global shared files for Windows agents (Unix agent uses policy download protocol).

API

Relayd exposes its API on http://localhost:3030/rudder/relay-api/:

See the API documentation for more information.

Logging

Relayd outputs its logs on stdout. You can access its logs through journalctl -u rudder-relay.

The log level and filters are configurable in /opt/rudder/etc/relayd/logging.conf:

  • level is the global minimal log level. It can be error, warning, info, debug or trace

  • filter allows increasing the log level of a particular component, with [component]=level, like database=trace. You can also filter logs by node id with [database{node=root}]. Apply multiple filters by separating them with a comma.

Reload the service to update log level and filters.

Security

Relayd runs with the rudder-relayd user and the rudder group. It also runs in a dedicated SELinux context on RHEL, and on recent systemd versions it runs with limited access to filesystem (can only write into predefined data directories).


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