Microshift-etcd doesn't start up with memoryLimitMB set to 50. Even with 80, it throws lot of errors. 
Need to figure out a minimum permissible value for memoryLimitMB in order for Microshift to work properly. 

Always

1. edit config.yaml file in path /etc/microshift/. 
etcd:
  memoryLimitMB: 80

2.sudo systemctl restart microshift
3.systemctl status microshift
4.journalctl -u microshift-etcd.scope  

systemctl status microshift
● microshift.service - MicroShift
     Loaded: loaded (/usr/lib/systemd/system/microshift.service; enabled; preset: disabled)
     Active: activating (start) since Thu 2023-04-06 12:11:15 EDT; 1min 28s ago
   Main PID: 98609 (microshift)
      Tasks: 8 (limit: 22857)
     Memory: 27.1M
        CPU: 761ms
     CGroup: /system.slice/microshift.service
             └─98609 microshift runApr 06 12:11:58 localhost.localdomain microshift[98609]:   "Metadata": null
Apr 06 12:11:58 localhost.localdomain microshift[98609]: }. Err: connection error: desc = "transport: authentication handshake failed: context deadline exceeded"
Apr 06 12:12:20 localhost.localdomain microshift[98609]: etcd W0406 12:12:20.716382   98609 logging.go:59] [core] [Channel #1 SubChannel #2] grpc: addrConn.createTransport failed to connect to {
Apr 06 12:12:20 localhost.localdomain microshift[98609]:   "Addr": "localhost:2379",
Apr 06 12:12:20 localhost.localdomain microshift[98609]:   "ServerName": "localhost",
Apr 06 12:12:20 localhost.localdomain microshift[98609]:   "Attributes": null,
Apr 06 12:12:20 localhost.localdomain microshift[98609]:   "BalancerAttributes": null,
Apr 06 12:12:20 localhost.localdomain microshift[98609]:   "Type": 0,
Apr 06 12:12:20 localhost.localdomain microshift[98609]:   "Metadata": null
Apr 06 12:12:20 localhost.localdomain microshift[98609]: }. Err: connection error: desc = "transport: authentication handshake failed: context deadline exceeded"
----------------------------------------------------------------------------

[redhat@localhost microshift]$ journalctl -u microshift-etcd.scope


I0406 04:47:14.013658    8798 run.go:199] backend store fragmented: 28.68 %, dbSize: 2813952
Apr 06 04:47:15 localhost.localdomain microshift[8798]: {"level":"warn","ts":"2023-04-06T04:47:15.444-0400","caller":"etcdserver/util.go:166","msg":"apply request took too long","took":"135.803258ms","expected->
Apr 06 04:47:15 localhost.localdomain microshift[8798]: {"level":"info","ts":"2023-04-06T04:47:15.459-0400","caller":"traceutil/trace.go:171","msg":"trace[42915613] transaction","detail":"{read_only:false; resp>
Apr 06 04:47:16 localhost.localdomain microshift[8798]: {"level":"warn","ts":"2023-04-06T04:47:16.019-0400","caller":"etcdserver/util.go:166","msg":"apply request took too long","took":"184.833464ms","expected->
Apr 06 04:47:16 localhost.localdomain microshift[8798]: {"level":"info","ts":"2023-04-06T04:47:16.039-0400","caller":"traceutil/trace.go:171","msg":"trace[108528780] compact","detail":"{revision:17115; response>
Apr 06 04:47:16 localhost.localdomain microshift[8798]: {"level":"info","ts":"2023-04-06T04:47:16.020-0400","caller":"mvcc/index.go:214","msg":"compact tree index","revision":17115}
Apr 06 04:47:18 localhost.localdomain microshift[8798]: {"level":"warn","ts":"2023-04-06T04:47:18.684-0400","caller":"etcdserver/util.go:166","msg":"apply request took too long","took":"1.204397124s","expected->
Apr 06 04:47:18 localhost.localdomain microshift[8798]: {"level":"info","ts":"2023-04-06T04:47:18.697-0400","caller":"traceutil/trace.go:171","msg":"trace[766890132] linearizableReadLoop","detail":"{readStateIn>
Apr 06 04:47:18 localhost.localdomain microshift[8798]: {"level":"info","ts":"2023-04-06T04:47:18.697-0400","caller":"traceutil/trace.go:171","msg":"trace[1515916930] transaction","detail":"{read_only:false; re>
Apr 06 04:47:18 localhost.localdomain microshift[8798]: {"level":"warn","ts":"2023-04-06T04:47:18.723-0400","caller":"v3rpc/interceptor.go:197","msg":"request stats","start time":"2023-04-06T04:47:17.479-0400",>
Apr 06 04:47:18 localhost.localdomain microshift[8798]: {"level":"warn","ts":"2023-04-06T04:47:18.723-0400","caller":"etcdserver/util.go:166","msg":"apply request took too long","took":"164.799766ms","expected->
Apr 06 04:47:18 localhost.localdomain microshift[8798]: {"level":"info","ts":"2023-04-06T04:47:18.723-0400","caller":"traceutil/trace.go:171","msg":"trace[1607496797] range","detail":"{range_begin:/kubernetes.i>
Apr 06 04:47:19 localhost.localdomain microshift[8798]: {"level":"info","ts":"2023-04-06T04:47:19.050-0400","caller":"mvcc/kvstore_compaction.go:66","msg":"finished scheduled compaction","compact-revision":1711>
Apr 06 04:47:19 localhost.localdomain microshift[8798]: {"level":"info","ts":"2023-04-06T04:47:19.050-0400","caller":"mvcc/hash.go:137","msg":"storing new hash","hash":765658342,"revision":17115,"compact-revisi>
Apr 06 04:47:19 localhost.localdomain microshift[8798]: {"level":"warn","ts":"2023-04-06T04:47:19.368-0400","caller":"etcdserver/util.go:166","msg":"apply request took too long","took":"361.603455ms","expected->
Apr 06 04:47:19 localhost.localdomain microshift[8798]: {"level":"info","ts":"2023-04-06T04:47:19.369-0400","caller":"traceutil/trace.go:171","msg":"trace[116310655] linearizableReadLoop","detail":"{readStateIn>
Apr 06 04:47:19 localhost.localdomain microshift[8798]: {"level":"warn","ts":"2023-04-06T04:47:19.369-0400","caller":"v3rpc/interceptor.go:197","msg":"request stats","start time":"2023-04-06T04:47:19.006-0400",>
Apr 06 04:47:19 localhost.localdomain microshift[8798]: {"level":"warn","ts":"2023-04-06T04:47:19.369-0400","caller":"etcdserver/util.go:166","msg":"apply request took too long","took":"361.954023ms","expected->
Apr 06 04:47:19 localhost.localdomain microshift[8798]: {"level":"info","ts":"2023-04-06T04:47:19.369-0400","caller":"traceutil/trace.go:171","msg":"trace[1030155816] range","detail":"{range_begin:/kubernetes.i>
Apr 06 04:47:19 localhost.localdomain microshift[8798]: {"level":"warn","ts":"2023-04-06T04:47:19.369-0400","caller":"v3rpc/interceptor.go:197","msg":"request stats","start time":"2023-04-06T04:47:19.007-0400",>
Apr 06 04:47:19 localhost.localdomain microshift[8798]: {"level":"warn","ts":"2023-04-06T04:47:19.383-0400","caller":"etcdserver/util.go:166","msg":"apply request took too long","took":"125.33249ms","expected-d>

[redhat@localhost microshift]$ systemctl status microshift-etcd.scope
● microshift-etcd.scope - /usr/bin/microshift-etcd run
     Loaded: loaded (/run/systemd/transient/microshift-etcd.scope; transient)
  Transient: yes
     Active: active (running) since Thu 2023-04-06 12:22:04 EDT; 28s ago
      Tasks: 9 (limit: 22857)
     Memory: 109.6M (high: 128.0M available: 18.3M)
        CPU: 910ms
     CGroup: /system.slice/microshift-etcd.scope
             └─99808 /usr/bin/microshift-etcd runApr 06 12:22:06 localhost.localdomain microshift[99808]: {"level":"info","ts":"2023-04-06T12:22:06.565-0400","logger":"raft","caller":"etcdserver/zap_raft.go:77","msg":"a70d4343126
..............................................


[redhat@localhost microshift]$ systemctl status microshift
● microshift.service - MicroShift
     Loaded: loaded (/usr/lib/systemd/system/microshift.service; enabled; preset: disabled)
     Active: active (running) since Thu 2023-04-06 12:22:42 EDT; 4s ago
   Main PID: 99798 (microshift)
      Tasks: 11 (limit: 22857)
     Memory: 357.5M
        CPU: 7.370s
     CGroup: /system.slice/microshift.service
             └─99798 microshift runApr 06 12:22:42 localhost.localdomain microshift[99798]: kubelet I0406 12:22:42.470407   99798 prober_manager.go:287] "Failed to trigger a manual run" probe="Readiness"
Apr 06 12:22:42 localhost.localdomain microshift[99798]: kubelet I0406 12:22:42.470477   99798 prober_manager.go:287] "Failed to trigger a manual run" probe="Readiness"

 

Microshift-etcd should run successfully even after configuring memoryLimitMB to a minimum permissible value.