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Chapter 7. Troubleshoot 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 load on the system. In memory-constrained systems, you might need to limit the amount of memory etcd uses.

Procedure

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

    etcd:
  memoryLimitMB: 128
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    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. The lower the limit, the longer etcd takes to respond to queries. If the limit is too low or the etcd usage is high, queries time out.

Verification

  1. After modifying the memoryLimitMB value in /etc/microshift/config.yaml, restart MicroShift by running the following command: 

    $ sudo systemctl restart microshift
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  2. Verify the new memoryLimitMB value is in use by running the following command: 

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