Re: Seek guide to extend BOSH to support other IaaSs

James Bayer

that blog is a bit out of date. a track of work called "bosh external cpi"
is about finished that enables plugging in the CPIs without having to make
bosh component adjustments (depends on the target IaaS i suppose). i
encourage you to reach out to dimitriy.

On Mon, Jun 22, 2015 at 12:04 AM, jinsenglin <jinsenglin(a)> wrote:

Hi Guillaume

Thanks for your help. The IaaS I am working for is our internal computing
platform, which is developed based on KVM. I also found a useful blog
article [1] about how to build a custom BOSH CPI. Bad news is that to do so
needs make adjustments inside the BOSH components. Such adjustments will
cause upgrade issues in future when newer version of BOSH is released.



*From:* cf-bosh-bounces(a) [mailto:
cf-bosh-bounces(a)] *On Behalf Of *Guillaume Berche
*Sent:* Friday, June 19, 2015 2:55 PM
*To:* Discussions about the Cloud Foundry BOSH project.
*Subject:* Re: [cf-bosh] Seek guide to extend BOSH to support other IaaSs

Hi Jim,

Until the bosh contributors get you an official doc, here are some
pointers I collected while studying the development of an external CPI [1]

- Stdin/stdout API wiki
- Sequenting of calls

- *"One way to find out order of all those things is to run bosh-lite
and look at the logs. All cpi methods act on some resources that have cloud
ids. e.g. attach_disk for example takes vm_cid and disk_cid which means
that create_vm and create_disk would be called at some point before this.
Important thing to note is that bosh may call any of those methods in a
different order depending on the situation as long as bosh is able to
provide needed arguments to the methods."*
- *Another way is to look at the debug traces from the bosh-init
logging <>*
- diagrams:

- deploy flow
- delete flow

BTW, which Iaas are you looking at developping a CPI for ?

Hope this helps,



On Thu, Jun 18, 2015 at 5:37 AM, jinsenglin <jinsenglin(a)> wrote:

Hi all

I’m trying to extend BOSH to support other IaaSs. However there [1] is no
document about how to do so, but only few item bullets listed without
hyperlinks. For understanding it, so far what I only can do is to trace the
existing CPI implementation source code, like AWS CPI[2], OpenStack CPI[3],
or vSphere CPI[3]. My question is that is there any further guide to help
get quickly knowledge about it? Thanks you all for kindness.






Software Engineer


Data Analytics Technology & Applications Research Institute (DATA)

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Thank you,

James Bayer

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