Packer: AWS builder spot-price too low

[nwalke]

Trying out the spot-price option in packer. I have it set to auto and the spot_price_auto_product set to Linux/UNIX (Amazon VPC) for an Ubuntu server inside a VPC. Packer tries to set the price to 0.0376, but that price is too low. If I go in to the console and request a spot instance at that price, I also get denied. But if I set the price to 0.038, my request goes through.

I've seen #1763, but I don't think that will help the particular issue I'm having. It seems like it might be a math error in calculating the correct current price.

[gergnz]

This is affecting me too.

[mbravorus]

Happens repeatedly for me as well. Checking in AWS Console, it plainly says that the auto calculated price is less then required minimum price (by over $0.01). Relaunching packer consistently miscalculates the same value.

[dmourati]

Hmm, running into this myself now.

price-too-low one-time a minute ago

I'm also graphing the spot prices per AZ for this instance type. The packer-computed bid is higher than one AZ's spot price, but lower than the other.

[dmourati]

I just set my price manually. Turns out you have to specify a subnet if you are using non-default VPC. I forgot that.

[ryansb]

I encountered a related issue, and my PR (#3662) will also fix this one.