Troubleshooting Unable to ssh Into an OCI instance

Purpose

There are a lot of potential causes for not being able to ssh in to an instance. The most common are outlined here.

Troubleshooting Steps

Issue 1: Security list rule allowing TCP traffic for port 22

To troubleshoot this, run the following command:

ssh -vvv -i <path to private key> opc@<ip address of instance>

If this is the cause, you'll likely see something similar to the following as the output:

ssh -vvv -i .ssh/keyfile opc@10.22.33.44
OpenSSH_7.6p1, LibreSSL 2.6.2
debug1: Reading configuration data /Users/Brad/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 48: Applying options for *
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 10.22.33.44 port 22.