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schard

Forum Moderator

From: Hannover

Registered: 2016-05-06

Posts: 2,519

Website

[SOLVED] nftables.service does not flush tables before restarting

I discovered, that with the most recent nftables.service unit from the up-to-date package, the tables are not getting flushed on a reload, resulting in duplicate entries after

# systemctl restart nftables.service

I hacked around this via "systemctl edit":

$ cat /etc/systemd/system/nftables.service.d/override.conf 
[Service]
ExecStop=/usr/bin/nft flush ruleset
RemainAfterExit=true

My question now is, whether I should open a bug report on this, or is this, for reasons I cannot grasp, intended behaviour?

Edit:
As a fun-fact, Debian does it as I expect it to be done:

[Unit]
Description=nftables
Documentation=man:nft(8) http://wiki.nftables.org
Wants=network-pre.target
Before=network-pre.target shutdown.target
Conflicts=shutdown.target
DefaultDependencies=no

[Service]
Type=oneshot
RemainAfterExit=yes
StandardInput=null
ProtectSystem=full
ProtectHome=true
ExecStart=/usr/sbin/nft -f /etc/nftables.conf
ExecReload=/usr/sbin/nft -f /etc/nftables.conf
ExecStop=/usr/sbin/nft flush ruleset

[Install]
WantedBy=sysinit.target

Last edited by schard (2021-12-14 11:44:01)

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GeorgeJP

Member

From: Czech Republic

Registered: 2020-01-28

Posts: 189

Re: [SOLVED] nftables.service does not flush tables before restarting

If I remember, in some version not so far ago were requiered to include

flush ruleset

as first command to

/etc/nftables.conf

EDIT: from pacman.log:

[2021-07-29T00:00:36+0200] [PACMAN] Running 'pacman -Syu'
[2021-07-29T00:00:36+0200] [PACMAN] synchronizing package lists
[2021-07-29T00:00:36+0200] [PACMAN] starting full system upgrade
[2021-07-29T00:40:16+0200] [PACMAN] Running 'pacman -Syu'
[2021-07-29T00:40:16+0200] [PACMAN] synchronizing package lists
[2021-07-29T00:40:16+0200] [PACMAN] starting full system upgrade
[2021-07-29T00:40:17+0200] [ALPM] transaction started
[2021-07-29T00:40:17+0200] [ALPM] warning: /etc/nftables.conf installed as /etc/nftables.conf.pacnew
[2021-07-29T00:40:17+0200] [ALPM] upgraded nftables (1:0.9.9-1 -> 1:0.9.9-6)
[2021-07-29T00:40:17+0200] [ALPM-SCRIPTLET] ==> Stopping/restarting the nftables service does NOT flush the ruleset anymore.
[2021-07-29T00:40:17+0200] [ALPM-SCRIPTLET] ==> The nftables.conf file requires a delete/flush directive to be restarted.
[2021-07-29T00:40:17+0200] [ALPM-SCRIPTLET] ==> See examples in /usr/share/nftables/ and /usr/share/doc/nftables/examples.
[2021-07-29T00:40:17+0200] [ALPM-SCRIPTLET] ==> The nftables service reload has been removed as it is now equivalent to a restart.
[2021-07-29T00:40:17+0200] [ALPM] transaction completed

Last edited by GeorgeJP (2021-12-14 11:32:56)

schard

Forum Moderator

From: Hannover

Registered: 2016-05-06

Posts: 2,519

Website

Re: [SOLVED] nftables.service does not flush tables before restarting

Thanks for the hint. That's what you get if you skip pacman's log messages.

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Inofficial first vice president of the Rust Evangelism Strike Force