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
The reference names a signal you type. It does not send one. TERM asks a process to exit. KILL cannot be caught. HUP often means reread, and only for a daemon whose manual says so.
The pid would be one you read on a host you administer. Do not signal pid 1 or sshd. Do not send a signal during the reading.
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.
- Name the signal.
- Write what you think it does.
- Leave KILL as a later choice.
- Do not send it.
- Stop.
Mistakes that outlive the command
Linux Signals Explained goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.
- KILL as the first signal.
- pid 1 signaled.
- A signal sent during the reading.
- HUP sent to a daemon you did not check.
Decisions to write down
One decision for Linux Signals Explained: The signal is named. TERM comes before KILL. Nothing was sent. And pid 1 is excluded.
Checks before you call it done
Confirm this before you call the change done: The signal is written. The meaning is written. Nothing was sent. pid 1 is excluded. And the host, if any, is yours. If one of those fails, stop.
# TERM before KILL.
# Do not signal pid 1.
# The reference does not send a signal.Before you leave the host
Linux Signals Explained 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.
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