User data 注入方式：
例如准备传递以下参数给cloudinit，则需要在 http://www.mxcz.net/ 类似的网站base64 在线转换格式，将其转换为base64

users:
 - name: test
 shell: /bin/bash
 groups: root
 ssh-authorized-keys:
 - ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDJ12O0R4vwpijVv3pog6IOPxpuy+JU11z+NXl+plPBa+F3SS+eBQIbN5x7iXiiVQMUUttVPz99GMUQfmoGosQmSGyS68PdZ8Yq1KAUdGUTYwx+27wiTNNdDku5D8nYinm9hbFTB0bNK8CUUZks/KmuAhk1qFiWy4JGfX5ixc+e07RIsNmyQSySJKtQJXO02JvHsTD7byqw3T17hsbm4ej05C9kZnAE8tokQbp4m4B+Qz/SRlN008vk2HS6r41KnoUJqJe2SrgsKuAw7HKzkAMzdw00oagIQHYdonSSpN/UPsg5gviPXIBcrQHECYCSx3VIGm2E1iosLXCJfjroD1lT root@10-0-0-18
bootcmd:
- echo 192.168.1.130 us.archive.ubuntu.com >> /etc/hosts
- mkdir /tmp/temp 

write_files:
- path: /tmp/hello
content: |
Hello, world!

以上部分转换成base64为
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
在创建云主机时指定systemTags='userdata::'在双引号后插入指定的base64代码，创建即可。

CreateVmInstance name=carl-user instanceOfferingUuid=b1618b4f60fb427785bd06cc1d08bd75 imageUuid=c83c84988c574ba7b8564c79e9a33888 l3NetworkUuids=6b25d7c8de07488c936f219f49bcdcb8 systemTags='userdata::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'

云主机开机后，检查以下文件，均已更新
/tmp/hello
/etc/hosts
目录 /tmp/temp存在
在10.0.0.18机器上执行ssh test@vm_ip 输入yes后，无须密码即可登录