Added Kubernetes CRD with Rust post

src/posts/create-kubernetes-crd-with-rust/README.md

@@ -0,0 +1,79 @@
+---
+title: Creating Kubernetes CRDs with Rust
+date: 2023-06-19 19:43:09
+author: Patrick Kerwood
+excerpt: |
+  You can extend Kubernetes with your own custom objects,
+  but before you can do that you will need create a Custom Resource Definition so that Kubernetes knows what the
+  object is allowed to look like. In this post I will create a very simple Kubernetes CRD for a Book kind using Rust and kube-rs.
+
+type: post
+blog: true
+tags: [kubernetes, rust]
+meta:
+- name: description
+  content: How to create a Custom Resource Definition using Rust
+---
+{{ $frontmatter.excerpt }}
+
+Start by initiating a new Rust package.
+```sh
+cargo init book-crd
+```
+
+Add below dependencies to the `cargo.toml` file.
+```toml
+kube = { version = "0.83.0", features = ["runtime", "derive"] }
+k8s-openapi = { version = "0.18.0", features = ["v1_26"] }
+serde = "1.0.155"
+serde_derive = "1.0.155"
+serde_json = "1.0.94"
+serde_yaml = "0.9.19"
+schemars = "0.8.12"
+```
+
+Moving on to `main.rs`, add the nessacary libraries to the top of the file.
+```rust
+#[macro_use]
+extern crate serde_derive;
+use kube::{CustomResource, CustomResourceExt};
+use schemars::JsonSchema;
+```
+
+Create a `BookSpec` struct with your desired properties. If you are reading this post you are probably already familiar
+with Kubernetes, I will not go into details with the `kube` properties, they are pretty self-explanatory.
+
+```rust
+#[derive(CustomResource, Debug, Serialize, Deserialize, Default, Clone, JsonSchema)]
+#[kube(group = "linuxblog.xyz", version = "v1", kind = "Book", namespaced)]
+#[kube(status = "BookStatus")]
+pub struct BookSpec {
+    pub title: String,
+    pub authors: Option<Vec<String>>,
+    pub isbn: u16,
+}
+```
+
+Adding a Status spec is optional.
+```rust
+#[derive(Deserialize, Serialize, Clone, Debug, Default, JsonSchema)]
+pub struct BookStatus {
+    pub is_ok: bool,
+    pub is_synced: bool,
+}
+```
+
+In the `main` function print out the `Book` CRD.
+```rust
+fn main() {
+    println!("{}", serde_yaml::to_string(&Book::crd()).unwrap());
+}
+```
+
+That is it. Do a `cargo run` and it will print out the Custom Resource Definition as YAML.
+
+## References
+- [Kube Derive Custom Resource](https://docs.rs/kube/latest/kube/derive.CustomResource.html)
+---
+
+