From 39a5cc646d961285d90ab6e4c0ae466df211d13c Mon Sep 17 00:00:00 2001
From: Ruslan Savchuk <savchuk.rus@gmail.com>
Date: Thu, 3 Apr 2025 23:13:20 +0200
Subject: [PATCH] add basic init script

---
 src/init.sh | 358 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 358 insertions(+)
 create mode 100644 src/init.sh

diff --git a/src/init.sh b/src/init.sh
new file mode 100644
index 0000000..8f7000a
--- /dev/null
+++ b/src/init.sh
@@ -0,0 +1,358 @@
+#!/bin/bash
+
+stage=""
+
+# Parse command line arguments
+while [[ "$#" -gt 0 ]]; do
+    case $1 in
+        --stage) 
+            stage="$2"
+            shift # Remove --last-stage
+            shift # Remove the value
+            ;;
+        *) 
+            echo "Unknown parameter: $1"
+            exit 1
+            ;;
+    esac
+done
+
+# init container runtime
+if [ "$stage" = "configure-runtime" ]; then
+echo '======================  download runc ========================='
+wget -q --show-progress --https-only --timestamping \
+  https://github.com/opencontainers/runc/releases/download/v1.2.6/runc.amd64
+
+echo '======================  make runc executable ========================='
+mv runc.amd64 runc \
+  && chmod +x runc \
+  && mv runc /usr/local/bin/
+
+echo '======================  download containerd ========================='
+wget https://github.com/containerd/containerd/releases/download/v2.0.4/containerd-2.0.4-linux-amd64.tar.gz
+
+echo '======================  make containerd executable ========================='
+mkdir containerd \
+  && tar -xvf containerd-2.0.4-linux-amd64.tar.gz -C containerd \
+  && mv containerd/bin/* /bin/
+
+echo '======================  int containerd service ========================='
+mkdir -p /etc/containerd/
+cat << EOF | tee /etc/containerd/config.toml
+[debug]
+  level = "debug"
+  
+[plugins]
+  [plugins.'io.containerd.cri.v1.images']
+    snapshotter = "native"
+  [plugins."io.containerd.cri.v1.runtime"]
+    [plugins."io.containerd.cri.v1.runtime".containerd]
+      default_runtime_name = "runc"
+      [plugins."io.containerd.cri.v1.runtime".containerd.runtimes]
+        [plugins."io.containerd.cri.v1.runtime".containerd.runtimes.runc]
+          runtime_type = "io.containerd.runc.v2"
+          snapshotter = "native"
+
+          [plugins."io.containerd.cri.v1.runtime".containerd.runtimes.runc.options]
+            BinaryName = "/usr/local/bin/runc"
+EOF
+
+cat <<EOF | tee /etc/systemd/system/containerd.service
+[Unit]
+Description=containerd container runtime
+Documentation=https://containerd.io
+After=network.target
+
+[Service]
+ExecStart=/bin/containerd
+Restart=always
+RestartSec=5
+Delegate=yes
+KillMode=process
+OOMScoreAdjust=-999
+LimitNOFILE=1048576
+LimitNPROC=infinity
+LimitCORE=infinity
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl daemon-reload \
+  && systemctl enable containerd \
+  && systemctl start containerd
+
+systemctl status containerd
+exit 0
+elif [ "$stage" = "configure-kubelet" ]; then
+echo '======================  download kubelet ========================='
+wget -q --show-progress --https-only --timestamping \
+  https://dl.k8s.io/v1.32.3/kubernetes-node-linux-amd64.tar.gz
+tar -xvzf kubernetes-node-linux-amd64.tar.gz
+
+echo '======================  make kubelet executable ========================='
+chmod +x kubernetes/node/bin/kubelet \
+  && mv kubernetes/node/bin/kubelet /usr/local/bin/
+
+echo '======================  disable swap ========================='
+swapoff -a
+
+echo '======================  int kubelet service ========================='
+cat <<EOF | tee /etc/systemd/system/kubelet.service
+[Unit]
+Description=kubelet: The Kubernetes Node Agent
+Documentation=https://kubernetes.io/docs/home/
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+ExecStart=/usr/local/bin/kubelet \\
+  --container-runtime-endpoint=unix:///var/run/containerd/containerd.sock \\
+  --file-check-frequency=10s \\
+  --pod-manifest-path='/etc/kubernetes/manifests/' \\
+  --v=10
+Restart=always
+StartLimitInterval=0
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl daemon-reload \
+  && systemctl enable kubelet \
+  && systemctl start kubelet
+
+systemctl status kubelet
+
+echo '======================  download crictl ========================='
+wget -q --show-progress --https-only --timestamping \
+  https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.32.0/crictl-v1.32.0-linux-amd64.tar.gz
+tar -xvf crictl-v1.32.0-linux-amd64.tar.gz \
+  && chmod +x crictl \
+  && mv crictl /usr/local/bin/
+
+echo '======================  configure crictl ========================='
+tar -xvf crictl-v1.32.0-linux-amd64.tar.gz \
+  && chmod +x crictl \
+  && mv crictl /usr/local/bin/
+
+cat <<EOF | tee /etc/crictl.yaml
+runtime-endpoint: unix:///run/containerd/containerd.sock
+image-endpoint: unix:///run/containerd/containerd.sock
+timeout: 10
+debug: false
+EOF
+
+exit 0
+# configure networking
+elif [ "$stage" = "configure-networking" ]; then
+echo '======================  download cni-plugins ========================='
+wget -q --show-progress --https-only --timestamping \
+  https://github.com/containernetworking/plugins/releases/download/v1.6.2/cni-plugins-linux-amd64-v1.6.2.tgz
+
+echo '======================  configure cni-plugins ========================='
+mkdir -p \
+  /etc/cni/net.d \
+  /opt/cni/bin
+
+tar -xvf cni-plugins-linux-amd64-v1.6.2.tgz -C /opt/cni/bin/
+
+cat <<EOF | tee /etc/cni/net.d/10-bridge.conf
+{
+    "cniVersion": "0.4.0",
+    "name": "bridge",
+    "type": "bridge",
+    "bridge": "cnio0",
+    "isGateway": true,
+    "ipMasq": true,
+    "ipam": {
+        "type": "host-local",
+        "ranges": [
+          [{"subnet": "10.240.1.0/24"}]
+        ],
+        "routes": [{"dst": "0.0.0.0/0"}]
+    }
+}
+EOF
+
+cat <<EOF | tee /etc/cni/net.d/99-loopback.conf
+{
+    "cniVersion": "0.4.0",
+    "name": "lo",
+    "type": "loopback"
+}
+EOF
+
+echo '======================  reconfigure cni-plugins ========================='
+cat <<EOF | tee /var/lib/kubelet/kubelet-config.yaml
+apiVersion: kubelet.config.k8s.io/v1beta1
+kind: KubeletConfiguration
+authentication:
+  anonymous:
+    enabled: true
+  webhook:
+    enabled: false
+authorization:
+  mode: AlwaysAllow
+networkPlugin: "cni"
+cniConfDir: "/etc/cni/net.d"
+cniBinDir: "/opt/cni/bin"
+EOF
+
+cat <<EOF | tee /etc/systemd/system/kubelet.service
+[Unit]
+Description=kubelet: The Kubernetes Node Agent
+Documentation=https://kubernetes.io/docs/home/
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+ExecStart=/usr/local/bin/kubelet \\
+  --container-runtime-endpoint=unix:///var/run/containerd/containerd.sock \\
+  --file-check-frequency=10s \\
+  --config=/var/lib/kubelet/kubelet-config.yaml \\
+  --pod-manifest-path='/etc/kubernetes/manifests/' \\
+  --v=10
+Restart=always
+StartLimitInterval=0
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl daemon-reload \
+  && systemctl restart kubelet
+
+systemctl status kubelet
+
+exit 0
+
+# configure etcd
+elif [ "$stage" = "configure-etcd" ]; then
+echo '======================  download cert tools ========================='
+wget -q --show-progress --https-only --timestamping \
+  https://github.com/cloudflare/cfssl/releases/download/v1.4.1/cfssl_1.4.1_linux_amd64 \
+  https://github.com/cloudflare/cfssl/releases/download/v1.4.1/cfssljson_1.4.1_linux_amd64
+
+mv cfssl_1.4.1_linux_amd64 cfssl \
+  && mv cfssljson_1.4.1_linux_amd64 cfssljson \
+  && chmod +x cfssl cfssljson \
+  && mv cfssl cfssljson /usr/local/bin/
+
+echo '======================  generate etcd certs ========================='
+cat <<EOF | tee ca-config.json 
+{
+  "signing": {
+    "default": {
+      "expiry": "8760h"
+    },
+    "profiles": {
+      "kubernetes": {
+        "usages": ["signing", "key encipherment", "server auth", "client auth"],
+        "expiry": "8760h"
+      }
+    }
+  }
+}
+EOF
+
+cat <<EOF | tee ca-csr.json
+{
+  "CN": "Kubernetes",
+  "key": {
+    "algo": "rsa",
+    "size": 2048
+  },
+  "names": [
+    {
+      "C": "US",
+      "L": "Portland",
+      "O": "Kubernetes",
+      "OU": "CA",
+      "ST": "Oregon"
+    }
+  ]
+}
+EOF
+
+cfssl gencert -initca ca-csr.json | cfssljson -bare ca
+
+HOST_NAME=$(hostname -a)
+KUBERNETES_HOSTNAMES=kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.svc.cluster.local
+
+cat <<EOF | tee kubernetes-csr.json 
+{
+  "CN": "kubernetes",
+  "key": {
+    "algo": "rsa",
+    "size": 2048
+  },
+  "names": [
+    {
+      "C": "US",
+      "L": "Portland",
+      "O": "Kubernetes",
+      "OU": "Kubernetes The Hard Way",
+      "ST": "Oregon"
+    }
+  ]
+}
+EOF
+
+cfssl gencert \
+  -ca=ca.pem \
+  -ca-key=ca-key.pem \
+  -config=ca-config.json \
+  -hostname=worker,127.0.0.1,${KUBERNETES_HOSTNAMES},10.32.0.1 \
+  -profile=kubernetes \
+  kubernetes-csr.json | cfssljson -bare kubernetes
+
+echo '======================  download etcd ========================='
+wget -q --show-progress --https-only --timestamping \
+  "https://github.com/etcd-io/etcd/releases/download/v3.4.15/etcd-v3.4.15-linux-amd64.tar.gz"
+
+echo '======================  configure etcd ========================='
+tar -xvf etcd-v3.4.15-linux-amd64.tar.gz \
+  && mv etcd-v3.4.15-linux-amd64/etcd* /usr/local/bin/
+
+mkdir -p /etc/etcd /var/lib/etcd \
+  && chmod 700 /var/lib/etcd \
+  && cp ca.pem kubernetes.pem kubernetes-key.pem /etc/etcd/
+
+cat <<EOF | tee /etc/systemd/system/etcd.service
+[Unit]
+Description=etcd
+Documentation=https://github.com/coreos
+
+[Service]
+Type=notify
+ExecStart=/usr/local/bin/etcd \\
+  --client-cert-auth \\
+  --name etcd \\
+  --cert-file=/etc/etcd/kubernetes.pem \\
+  --key-file=/etc/etcd/kubernetes-key.pem \\
+  --trusted-ca-file=/etc/etcd/ca.pem \\
+  --listen-client-urls https://127.0.0.1:2379 \\
+  --advertise-client-urls https://127.0.0.1:2379 \\
+  --data-dir=/var/lib/etcd
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl daemon-reload \
+  && systemctl enable etcd \
+  && systemctl start etcd
+
+systemctl status etcd
+
+exit 0
+
+# configure api server
+elif [ "$stage" = "configure-etcd" ]; then
+
+fi