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What happens when nova boot image

This question is related to my serious troubles with booting images in question here

Even if i specify in myfile.txt

#cloud-config
password: mysecret
chpasswd: { expire: False }
ssh_pwauth: True

while

nova boot --flavor 2 --user-data=./myfile.txt --image 03c9ad20-b0a3-4b71-aa08-2728ecb66210 VF19RS

I cannot for God to login to VM via novnc console. It rejects me with login incorrect.

So my question is, what exactly happens when i call nova boot command? Something with cloud-init or something similar? Can i control the process when booting up? May i disable all changes being made for bright new VM instance?