cloud-init 是 事实上的云主机标准初始化组件。
cloud-init 主要有三种启动脚本目录:
```
/var/lib/cloud/scripts/per-boot/
/var/lib/cloud/scripts/per-instance/
/var/lib/cloud/scripts/per-once/
```
cloud-init 执行顺序如下,脚本目录通常在 cloud-final 这步执行,
```
systemd
↓
cloud-init-local.service
↓
cloud-init.service
↓
cloud-config.service
↓
cloud-final.service
```
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