RHDG OpenShift documentation, specifically chapter "11.2. Creating Caches with Data Grid CLI" suggest that customers can use RHDG cli in OpenShift pod directly (by "oc rsh").

But CLI prints unexpected confusing AESH exception without clear user-friendly error message.

Output

sh-4.4$ ./cli.sh
[disconnected]> quit
08:58:43,158 WARN  (Thread-0) [AliasManager] Could not persist to alias file: java.io.IOException: Permission denied
	at java.base/java.io.UnixFileSystem.createFileExclusively(Native Method)
	at java.base/java.io.File.createNewFile(File.java:1026)
	at org.aesh.readline.alias.AliasManager.persist(AliasManager.java:111)
	at org.aesh.readline.ReadlineConsole.doStop(ReadlineConsole.java:205)
	at org.aesh.readline.ReadlineConsole.stop(ReadlineConsole.java:211)
	at org.aesh.command.impl.invocation.AeshCommandInvocation.stop(AeshCommandInvocation.java:96)
	at org.infinispan.cli.impl.ContextAwareCommandInvocation.stop(ContextAwareCommandInvocation.java:63)
	at org.infinispan.cli.commands.Quit.exec(Quit.java:31)
	at org.infinispan.cli.commands.CliCommand.execute(CliCommand.java:32)
	at org.infinispan.cli.commands.CliCommand.execute(CliCommand.java:14)
	at org.aesh.command.impl.operator.EndOperator.execute(EndOperator.java:41)
	at org.aesh.command.impl.Executions$ExecutionImpl.execute(Executions.java:213)
	at org.aesh.readline.Process.run(Process.java:80)

sh-4.4$ 

Steps to reproduce:

• Use OpenShift 4.6 and oc 4.6 client
• create RHDG OpenShift service

  export INSTALL_NAMESPACE="${USER}-1-namespace"
  export WATCH_NAMESPACE="${USER}-1-watch-namespace"
  
  oc new-project ${INSTALL_NAMESPACE}
  oc new-project ${WATCH_NAMESPACE}
  
  oc apply -f - << EOF
  apiVersion: operators.coreos.com/v1
  kind: OperatorGroup
  metadata:
   name: datagrid
   namespace: ${INSTALL_NAMESPACE}
  spec:
   targetNamespaces:
   - ${WATCH_NAMESPACE}
  EOF
  
  oc apply -f - << EOF
  apiVersion: operators.coreos.com/v1alpha1
  kind: Subscription
  metadata:
   name: datagrid-operator
   namespace: ${INSTALL_NAMESPACE}
  spec:
   channel: 8.1.x
   installPlanApproval: Automatic
   name: datagrid
   source: redhat-operators
   sourceNamespace: openshift-marketplace
  EOF
  
  oc get pods -n ${INSTALL_NAMESPACE}
  #wait until operator is installed
  sleep 15
  oc get pods -n ${INSTALL_NAMESPACE}
  
  oc project ${WATCH_NAMESPACE}
  
  oc apply -f - << EOF
  apiVersion: infinispan.org/v1
  kind: Infinispan
  metadata:
    name: example-infinispan
  spec:
    replicas: 1
  EOF
  
  oc get pods
  #wait until RHDG is "Running" and "READY"
  sleep 20
  oc get pods
  

• connect to RHDG pod

  oc rsh example-infinispan-0
  

• call RHDG CLI there

  cd /opt/infinispan/bin
  

• start and quit RHDG CLI

  ./cli.sh
  quit