Expected runtime Behavior if CNI ADD call fails

[Aggarwal Sre]

Hi CNI Dev,

I want to ask if there is an expectation on the container runtime with regards to calling CNI DEL, if CNI ADD fails for some reason.

As per this:

https://github.com/containernetworking/cni/blob/master/SPEC.md#general-considerations

The container runtime must order ADD and DEL operations for a container, such that ADD is always eventually followed by a corresponding DEL. DEL may be followed by additional DELs but plugins should handle multiple DELs permissively (i.e. plugin DEL should be idempotent).

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Regards,
Vivek Aggarwal

[Aggarwal Sre]

Ping. I would really appreciate a guidance on this. 

[Aggarwal Sre]

Ping, I would appreciate, if could confirm the guidance on this

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[br...@weave.works]

I answered on the issue:  https://github.com/containernetworking/cni/issues/775, but I will reproduce here:

Interesting question. My first instinct was to say "no".

However it is specified that DEL must be called for a list, and I would expect the single-plugin case to behave the same as a list of 1. So that makes it "yes".