This is an original planning guide. It is not a vendor manual, an official standard, or legal advice. Example addresses use documentation ranges. Review every command before you paste it.
What this hour is for
CloudFormation Troubleshooting starts from a stack you administer and the first error line. You redact secrets. You do not delete the stack, and you do not keep retrying a change set.
Write the account, project, or repository you administer, the name of this change, and the time. A second change waits until this line has been read back.
The browser tool drafts text or reads a paste you already hold. It does not log in, it does not scan, and it does not apply.
192.0.2.10/24, gateway 192.0.2.1, 198.51.100.0/24, 203.0.113.0/24, and 2001:db8::/32 are documentation. example.com is a documentation name. A sample password is replaced.
The change you can finish
Apply nothing while you are writing the note. When the lab window opens, it is one change on the account named in the ticket. Read the draft, then the account, then decide.
Rollback is the previous file, the previous plan, or the lab resource you can delete because it was only a lab.
- Write the account and the stack.
- Copy the first error with secrets removed.
- Write one suspected cause.
- Do not deploy.
- Do not delete the stack.
- Stop.
Mistakes that outlive the statement
CloudFormation Troubleshooting goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.
- A stack deleted during the reading.
- The same deploy retried twice.
- A secret left in the pasted error.
- A stack you do not administer.
Decisions to write down
One decision for CloudFormation Troubleshooting: The stack is yours. Nothing is deployed. Nothing is deleted. Secrets are redacted. And one error is enough.
Checks before you call it done
Confirm this before you call the change done: The stack is written. The error is one line. Nothing was deployed. Nothing was deleted. And a second person can say the suspected cause. If one of those fails, stop.
# Stack reading. Do not deploy or delete during the reading.
Before you leave the account
CloudFormation Troubleshooting ends when the account in the note is the account in the ticket. If it is not, stop.
The draft stays a draft until a person has read the names in it. A generator does not log in, does not apply, and does not scan.
192.0.2.10/24, gateway 192.0.2.1, 198.51.100.0/24, 203.0.113.0/24, and 2001:db8::/32 are documentation. example.com is a documentation name. A sample password is replaced. It is not a password you keep. 10.0.0.0/16 is a sample prefix, not a network you publish unless you already use it.
prompt-for-this is a reminder that a secret is missing. It is not an access key, a token, or a password you save. An Azure secret draft may contain a sample password. Replace it. Do not file it.
One change is the window. If two things move and the result is wrong, you will not know which one did it.
If the same step fails twice, stop for the day. Restore the copy you took first.
A second person reads the account and the change aloud. If they cannot find them in the ticket, the note is not done.
This page is a planning guide. It is not a vendor manual, not an official standard, not legal advice, and not an audit opinion. You do not apply it against an account you do not administer.
Tools for this guide
These tools run in the browser on this site. They do not log into your machines.
Related pillar guides
More in this cluster
The pillar for this page, and the next published pages filed with it.