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content/posts/virt/cloudinit.md

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+---
+title: "Cloudinit"
+date: 2024-06-30T23:56:57+08:00
+draft: false
+toc: true
+tags: [cloudinit]
+---
+
+## cloudinit 介绍
+
+> 用于初始化网络, 主机名, 根文件系统, 用户名密码
+
+## cloudinit iso 镜像制作
+
+### 创建脚本
+
+```bash
+cat <<EOFALL > gen-cloudinit-iso.sh
+#!/bin/bash
+
+set -eux
+
+CLOUD_INIT_DIR="/var/lib/libvirt/disks/\${VM}/cloudinit"
+FILENAME="\${CLOUD_INIT_DIR}/init.iso"
+
+mkdir -p \${CLOUD_INIT_DIR}
+
+cat <<EOF > \${CLOUD_INIT_DIR}/meta-data
+instance-id: \${VM}
+local-hostname: \${VM}
+EOF
+
+# 更多配置参照 https://cloudinit.readthedocs.io/en/latest/explanation/format.html
+cat <<EOF > \${CLOUD_INIT_DIR}/user-data
+#cloud-config
+EOF
+
+# 参考 kubevirt /pkg/cloud-init/cloud-init.go:defaultIsoFunc
+xorrisofs -output \$FILENAME -volid cidata -joliet -rock -partition_cyl_align on \${CLOUD_INIT_DIR}/user-data \${CLOUD_INIT_DIR}/meta-data
+EOFALL
+```
+
+### 生成 cloudinit iso
+
+```bash
+VM=k8s-node01 bash gen-cloudinit-iso.sh
+```
+
+### 使用
+
+创建一个k8s节点虚拟机
+
+```bash
+VM=k8s-node01
+mkdir -p /var/lib/libvirt/disks/${VM}
+qemu-img create -f qcow2 -F qcow2 -b /var/lib/libvirt/images/ubuntu.qcow2 /var/lib/libvirt/disks/${VM}/sysdisk.qcow2 200G
+qemu-img create -f qcow2 /var/lib/libvirt/disks/${VM}/datadisk01.qcow2 500G
+qemu-img create -f qcow2 /var/lib/libvirt/disks/${VM}/datadisk02.qcow2 500G
+qemu-img create -f qcow2 /var/lib/libvirt/disks/${VM}/datadisk03.qcow2 500G
+
+virt-install \
+  --name ${VM} \
+  --memory 16384 \
+  --vcpus 8 \
+  --disk /var/lib/libvirt/disks/${VM}/sysdisk.qcow2,device=disk,bus=scsi \
+  --disk /var/lib/libvirt/disks/${VM}/datadisk01.qcow2,device=disk,bus=scsi \
+  --disk /var/lib/libvirt/disks/${VM}/datadisk02.qcow2,device=disk,bus=scsi \
+  --disk /var/lib/libvirt/disks/${VM}/datadisk03.qcow2,device=disk,bus=scsi \
+  --disk /var/lib/libvirt/disks/${VM}/cloudinit/init.iso,device=cdrom,bus=scsi \
+  --network bridge=br0 \
+  --import \
+  --os-variant ubuntu22.10 \
+  --noautoconsole
+```
+
+## 参考
+
+- https://cloudinit.readthedocs.io/en/latest/explanation/format.html
+- https://github.com/kubevirt/kubevirt/blob/main/pkg/cloud-init/cloud-init.go