Add notes for cilium

02-cni-cilium/README.md

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+# 02 | CNI Cilium
+
+Only install one CNI.  Cilium brings network policy capabilities and uses eBPF technology to provide increased performance.
+
+Reference: https://docs.cilium.io/en/stable/gettingstarted/k8s-install-default/
+
+First we must install the cilium CLI binary, as root:
+
+```bash
+sudo su -
+CILIUM_CLI_VERSION=$(curl -s https://raw.githubusercontent.com/cilium/cilium-cli/main/stable.txt)
+CLI_ARCH=amd64
+if [ "$(uname -m)" = "aarch64" ]; then CLI_ARCH=arm64; fi
+curl -L --fail --remote-name-all https://github.com/cilium/cilium-cli/releases/download/${CILIUM_CLI_VERSION}/cilium-linux-${CLI_ARCH}.tar.gz{,.sha256sum}
+sha256sum --check cilium-linux-${CLI_ARCH}.tar.gz.sha256sum
+sudo tar xzvfC cilium-linux-${CLI_ARCH}.tar.gz /usr/local/bin
+rm cilium-linux-${CLI_ARCH}.tar.gz{,.sha256sum}
+
+```
+
+Then we can use it to install cilium into Kubernetes:
+
+```bash
+cilium install --version 1.14.5
+
+```
+
+Validate the install:
+
+```bash
+cilium status --wait
+
+```
+
+The following test can be performed, but it won't work until worker nodes are joined.  
+
+```bash
+cilium connectivity test
+
+```