cloud-init 手动调试及问题解决

一. 参考资料

http://note.youdao.com/yws/public/redirect/share?id=6cd0a9dc3a6a19ad3821bff5b87e37df&type=false

使用cloud-init实现虚拟机信息管理

 

Pastedfrom <http://blog.csdn.net/jmppok/article/details/46521439>

 

OpenStack的 metadata 服务机制

 

Pastedfrom <http://www.ibm.com/developerworks/cn/cloud/library/1509_liukg_openstackmeta/index.html>

 

 

 二. 手动调试cloud-init方法I

How to run cloud-init manually

1)

$rm -rf/var/lib/cloud/*

OR

$rm -rf/var/lib/cloud/sem/* /var/lib/cloud/instance /var/lib/cloud/instances/*

 

2)

$cloud-initinit

$cloud-initmodules -m final

 

3)

$tail -f/var/log/cloud-init.log

$tail -f/var/log/cloud-init-output.log

 

Pastedfrom <http://fosshelp.blogspot.com/2015/10/how-to-run-cloud-init-manually.html>

 https://raymii.org/s/tutorials/Automating_Openstack_with_Cloud_init_run_a_script_on_VMs_first_boot.html#Re-execute_or_debugging

 

 三. 手动调试cloud-init方法II

 

Re-execute or debugging

The script only runs at first boot of the machine viacloud-init. If you execute thecloud-init command again it will not execute the script because it already did it. Testing and debugging the script can be quite intensive if you need to bootup a machine every time.

We can however foolcloud-init by letting it think the machine did a fresh first boot. We need to remove thefollowing two files:

/var/lib/cloud/instances/$UUID/boot-finished
/var/lib/cloud/instances/$UUID/sem/config_scripts_user

Replace$UUID by your instance's UUID.

Execute thefollowing command to run the cloud-init final module again:

cloud-init modules --mode final

Thefinal module will execute ouruser_data script again. Before every newtest run you need to remove the two files listed above.

Keep in mind as wellthat if you for example touch a file and run the script again, the file willstill be there. Changes are persistent, build your code idempotent so that ithandles that.

 

If you've byaccident deleted to much cloud-init data you can re-initialize it with thefollowing command:

cloud-init init

 

Pastedfrom <https://raymii.org/s/tutorials/Automating_Openstack_with_Cloud_init_run_a_script_on_VMs_first_boot.html#Re-execute_or_debugging>

四. cloud-init配置

cloud-init configuration

vi /etc/cloud.cfg

user: cloud

disable_root: 1

preserve_hostname: False

五. 数据源的选择

确认cloud-init使用的是“EC2"的data source（ubuntu only）

dpkg-reconfgure cloud-init

六. 遇到的问题

1. 无法把user-data中的内容写入虚机

通过route -n查看一下，路由表中是否有169.254.169.254这和条路由信息

如果没有，可以用下面的这命令加上：

route add -host 169.254.169.254 dev eth0(其中eth0是设备名字，可以根据实际情况选用)

上面这个命令在重启后会消失，故可以把上面的的命令加到/etc/rc.local中，避免重启机器后失效。

上面的命令也可以加到ifcfg-ethx的配置文件中，如下：

auto ethx

iface ethx inet dhcp 

up route add -host 169.254.169.254 dev ethx