There is a 1048576 size limit to a template. In TripleO it might grow to be very big and might reach that limit but even a little bit below that limit I constantly his this error (the number 524288 seems constant no matter what size I use to test):
heatclient.exc.HTTPBadRequest: ERROR: Request limit exceeded: Template exceeds maximum allowed size (524288 bytes)
To create large templates I used this bash script (thanks Zane for the idea, sh is faster though):
#!/bin/sh
STRING=$(yes A | head -n $1 | tr -d "\n")
echo "heat_template_version: '2013-05-23'
resources:
huge:
type: OS::Heat::SoftwareConfig
properties: {config: $STRING}" > huge.yaml
Save to file and run it ./test.sh N (where N is the number of characters you add to a SoftwareConfig parameter).
To reach the limit of 1048576 characters you need to add 1048334 characters to config ^
parent.yaml:
heat_template_version: '2013-05-23'
resources:
huge:
type: Test::Test
env.yaml:
resource_registry:
Test::Test: file:///home/stack/huge.yaml
If we do this:
./test.sh 1048335 (one more from what we are allowed to use) and try to create a stack directly from huge.yaml:
ERROR: Request limit exceeded: JSON body size (1048578 bytes) exceeds maximum allowed size (1048576 bytes).
If we do the same with 1048334 (exactly 1048576 bytes) the stack is created normally.
To test the same with a nested template and to reach the size limit +1, set the number to 1048126 and run like so:
heat stack-create test-012 -f parent.yaml -e env.yaml
This gives the same error, but if I am exactly on limit or a little below that limit, I see this error (no matter the size I use):
heatclient.exc.HTTPBadRequest: ERROR: Request limit exceeded: Template exceeds maximum allowed size (524288 bytes)
tested on heat version 0.6.0
Fix proposed to branch: master
Review: https:/