From cc38aa9e81484487f20b54c0e4639c9a175ce0dd Mon Sep 17 00:00:00 2001
From: Michele Cereda <cereda.michele@gmail.com>
Date: Sat, 11 Feb 2023 21:29:48 +0100
Subject: [PATCH] Improved KB about oracle cloud

---
 knowledge base/oci-cli.md      |  8 ++++++++
 knowledge base/oracle cloud.md | 16 +++++++++++++++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/knowledge base/oci-cli.md b/knowledge base/oci-cli.md
index 4cd340b..b598d99 100644
--- a/knowledge base/oci-cli.md	
+++ b/knowledge base/oci-cli.md	
@@ -39,6 +39,14 @@ oci compute image list -c 'tenancy_id' --all
 oci compute image list -c 'tenancy_id' \
   --operating-system 'Oracle Linux' --operating-system-version '8' \
   --lifecycle-state 'AVAILABLE'
+
+# List available compute instance plugins.
+# Requires to be given the OS and its version.
+oci instance-agent available-plugins get -c 'tenancy_id' \
+  --os-name 'Oracle Linux' --os-version '8'
+
+# List existing compute instances.
+oci compute instance list -c 'tenancy_id'
 ```
 
 ## Configuration
diff --git a/knowledge base/oracle cloud.md b/knowledge base/oracle cloud.md
index 8cf80ed..8dbea3f 100644
--- a/knowledge base/oracle cloud.md	
+++ b/knowledge base/oracle cloud.md	
@@ -2,6 +2,8 @@
 
 1. [Concepts](#concepts)
    1. [Compartments](#compartments)
+   2. [Networking](#networking)
+      1. [Access to the Internet](#access-to-the-internet)
 2. [Further readings](#further-readings)
 3. [Sources](#sources)
 
@@ -15,10 +17,21 @@ After creating a compartment, you need to write at least one policy for it; unti
 
 Before deleting a compartment, all its resources must have been moved, deleted or terminated, including any policies attached to the compartment itself.
 
+### Networking
+
+#### Access to the Internet
+
+| Resource         | Used for                                                                                           | Free-tier limit   |
+| ---------------- | -------------------------------------------------------------------------------------------------- | ----------------- |
+| Internet Gateway | **public** resources that need to **be** reach**ed** from the internet                             | ?                 |
+| NAT Gateway      | resources that **need to reach** the internet but **are not reachable from** the internet          | 0 (not available) |
+| Bastion          | resources that require Secure Shell (SSH) access but otherwise are not reachable from the internet | 5                 |
+
 ## Further readings
 
 - [oci-cli]
-- [compute images]
+- [Compute images]
+- [Connect to private compute instances using OCI Bastion Service]
 
 ## Sources
 
@@ -32,3 +45,4 @@ Before deleting a compartment, all its resources must have been moved, deleted o
 [oci-cli]: ./oci-cli.md
 
 <!-- external references -->
+[connect to private compute instances using oci bastion service]: https://medium.com/@harjulthakkar/connect-to-private-compute-instance-using-oci-bastion-service-ca96a3ceea49