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This page collects procedures to restart services (or reboot the underlying server) in the WMF production cluster.
Three of the hadoop workers run an additional JournalNode process. These are configured in the puppet manifest:
- The other Hadoop workers are running two services (hadoop-hdfs-datanode and hadoop-yarn-nodemanager). The services on the Hadoop workers can be restarted in arbitrary orde. The service restarts have no user-visible impact (and the machines can also be rebooted).
- TODO: Add notes for JournalNode hosts
We run four ntpd servers (chromium, hydrogen, acamar, achenar) and all of these are configured for use by the other servers in the cluster. As such, as long as only one server is restarted/rebooted at at time, everything is fine. The ntpd running locally on the individual servers can easily be restarted at any any time.