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
yq selects fields from YAML. The tester runs the filter on text you paste. It does not fetch a URL and it does not log into a host. Indentation is part of the document. A tab where spaces were required is a different file.
Remove tokens before you paste. A filter that prints a secret is a filter you narrow before the output goes in the ticket. One document.
192.0.2.10/24 and example.com are documentation. They stay in the note.
The change you can finish
Apply nothing while you are writing the note. When the lab window opens, it is one change on the host named in the ticket. Read the draft, then the host, then decide.
Rollback is the file, the package version, or the snapshot you saved first. You do not invent a rollback after the only copy is gone.
- Paste YAML you may hold, with tokens removed.
- Name the field.
- Draft the filter.
- Read the result.
- Redact anything that is still a secret.
- Stop.
Mistakes that outlive the command
yq Tutorial goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.
- A URL fetched by this page.
- A token pasted into the tester.
- A secret filed in the ticket.
- The only copy of a production file edited in place.
Decisions to write down
One decision for yq Tutorial: The document is one you hold. No URL is fetched. Tokens were removed first. The original file is untouched. And one filter.
Checks before you call it done
Confirm this before you call the change done: The field is named. The filter matches. No URL was fetched. No token is in the note. And the original was not replaced. If one of those fails, stop.
# Paste YAML you hold.
# Do not fetch a URL.
# Remove tokens first.Before you leave the host
yq Tutorial ends when the hostname in the prompt matches the hostname in the ticket. If it does not, you are on the wrong host. Stop. A command that succeeded on the wrong host is not progress.
The draft stays a draft until a person has read the names in it. A generator does not log into the host and does not know which disk is empty. You delete a line that names a host, a path, or an account you did not write down.
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. They belong in the note. They are not values you leave on a host because a draft included them.
prompt-for-this is a reminder that a secret is missing. It is not a password, a key, or a token you save in the ticket or in git. The real secret stays in the password store.
One change is the window. If two things move and the result is wrong, you will not know which one did it. The next change waits for its own page.
If the same step fails twice, stop for the day. The failure is the result. Adding a forum command beside a half-applied change produces a host nobody can rebuild. Restore the copy you took first.
A second person reads the hostname and the change aloud. If they cannot find them in the ticket, the note is not done. Silence is not agreement. Then leave the host alone.
This page is a planning guide. It is not a vendor manual, not an official standard, and not permission to touch a host you do not administer. You do not disable a firewall, AppArmor, or SELinux to make a check pass.
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.