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 converter translates a matching accept-port line and marks everything else for review. It says rich rules and drop policies need a review, and the source is not opened to the world by this starter. It adds a reload line you do not run during the reading.
Keep the SSH allow before any later drop. The console stays open. Do not turn the firewall off. Do not disable firewalld to test the page. The host is one you administer.
One rule. The rest of the table waits.
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 one rule you administer.
- Read which lines were translated.
- Mark rich rules and drops as unreviewed.
- Keep the SSH allow.
- Do not reload.
- Do not turn the firewall off.
Mistakes that outlive the command
iptables to firewalld Migration Guide goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.
- A reload during the reading.
- The firewall turned off.
- An unreviewed drop loaded.
- The source opened to the world.
- A host you do not administer.
- SSH allow removed.
Decisions to write down
One decision for iptables to firewalld Migration Guide: Only an accept-port line is treated as translated. The SSH allow remains. Nothing was reloaded. The firewall stays on. The host is yours. And unreviewed lines are marked.
Checks before you call it done
Confirm this before you call the change done: The rule is written. Translated and unreviewed lines are separated. The SSH allow is written. Nothing was reloaded. And the firewall stays on. If one of those fails, stop.
# Only an accept-port line is translated.
# Rich rules and drops need a person.
# The source is not opened to the world.
# Do not reload.
# Do not turn the firewall off.Before you leave the host
iptables to firewalld Migration Guide 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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