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Chapter 7. Troubleshooting etcd

To troubleshoot etcd and improve performance, configure the memory allowance for the service.

By default, etcd uses as much memory as necessary to handle the system load. On memory-constrained systems, limiting the amount of memory etcd uses might be necessary. Configure the memoryLimitMB parameter to restrict the memory consumption of the etcd server.

Procedure

  • Edit the /etc/microshift/config.yaml configuration file to set the memoryLimitMB value. 

    etcd:
  memoryLimitMB: 128
    Note

    The minimum required value for memoryLimitMB on MicroShift is 128 MB. Values close to the minimum value are more likely to impact etcd performance. Lower limits increase the time etcd takes to respond to queries. If the limit is too low or etcd usage is high, queries might time out.

Verification

  1. Restart MicroShift to apply the changes by running the following command: 

    $ sudo systemctl restart microshift

  2. Verify that the new memoryLimitMB value is in use by running the following command: 

    $ systemctl show --property=MemoryHigh microshift-etcd.scope
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