* Migrate OCI_INSTANCE_IP to OCI_INSTANCE

* Error diagnostics for missing SSH key(s)

Author: DKroot

README.md

@@ -17,7 +17,7 @@ Configure and ssh or create a tunnel to an Oracle Cloud Infrastructure host via
 2. Install and configure [OCI CLI](https://docs.oracle.com/en-us/iaas/Content/API/SDKDocs/cliinstall.htm).
 3. Install [`jq`](https://stedolan.github.io/jq/).
 4. Define the following environment variables. OCI menus below are as of October 2022. 
-    1. `OCI_INSTANCE_IP`: OCI host IP. See `Compute` > `Instances` > {host} > `Primary VNIC` > `Private IP address`
+    1. `OCI_INSTANCE`: OCI host Internal FQDN or Private IP. See `Compute` > `Instances` > {host} > `Primary VNIC`.
     2. `OCI_INSTANCE_OCID`. See `Compute` > `Instances` > {host} > `General information` > `OCID`
     3. `OCI_BASTION_OCID`. See `Identity & Security` > `Bastion` > {bastion} > `Bastion information` > `OCID`
     * If you're working with the single OCI host, setting them globally in your environment will work well.
@@ -27,6 +27,6 @@ Configure and ssh or create a tunnel to an Oracle Cloud Infrastructure host via
 
 * Create a bastion session and ssh using system environment vars: `ssh-oci-bastion.sh joe`
 * Create a bastion session and ssh: 
-  `OCI_INSTANCE_IP=10.0.xx OCI_INSTANCE_OCID=ocid1.instance.xx OCI_BASTION_OCID=ocid1.bastion.xx ssh-oci-bastion.sh joe`
+  `OCI_INSTANCE=10.0.xx OCI_INSTANCE_OCID=ocid1.instance.xx OCI_BASTION_OCID=ocid1.bastion.xx ssh-oci-bastion.sh joe`
 * Create a bastion port-forwarding session and launch the tunnel for the port 1234: `ssh-oci-bastion.sh -p 1234`