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How to cleanly stop and restart firewalld?

+1 vote
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We always see failures after doing; systemctl stop firewald followed by systemctl start firewalld. To clear the issue we seem to have to reboot the system.

posted Jun 16, 2015 by Rameshwar

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Have you tried using this:

systemctl restart firewald

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+2 votes

I'm struggling to stop 'yumBackend.py' hogging the CPU & sending the load averages over 2.00.

I've disabled it via the GUI in Software & rebooted but it's still running every five minutes. Is there a way of dealing with this via the cli?

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I have been looking at the new Fedora firewall 'firewalld' and the 'firewall-cmd' command. I'm currently running F17 on a PC with an F18 virtual machine, and have been trying to understand firewalld prior to
upgrading to Fedora 19.

The PC has a modified iptables. So I have been trying to see how to incorporate the changes into the new firewalld. I suspect I will need to use the 'firewall-cmd --direct' option to add the iptables rules (as I
see no other way of specifying on the rules source/destination addresses using 'firewall-cmd').

However, 'firewall-cmd' offers both the '--get-chains' and '--get-rules' options, but these both require specifying which table is to be used. How do I know what the tables are? There is no '--get-tables' option.
I can run 'cat /proc/net/ip_tables_names' and this lists the standard iptables tables (nat ,mangle, filter). But if I use these names with 'firweall-cmd' all I get is a blank line displayed. E.g.

 firewall-cmd --direct --get-chains ipv4 nat

The same occurs with all the table names.

So, my question is this, is 'firewall-cmd' working correctly and simply stating that none of the tables have any chains (and so no rules) Secondly, how do I find out what tables are defined for firewalld?

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I'd like to configure FirewallD to protect qemu/kvm host and maybe guests but the second one is not so important for me because each guest has it's own firewall.

What I don't understand is how FirewallD works with network bridges. Currently, I have bridge (br0) in trusted zone to allow as much traffic as possible, and p3p1 (which is NIC connected to switch) in public zone. When I put bridge in public zone I cut off networking from guests.

My question is, should I change rules on bridge or p3p1 and what is the correlation between them? What should I configure to pass networking traffic to guests but protect all ports on host system?

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Runnning old "Fedora 20-x86_64", and want to install Fedora-Kde-live-25-1-3.

Situation:
$ uname -rov
3.19.8-100.fc20.x86_64 #1 SMP Tue May 12 17:08:50 UTC 2015 GNU/Linux

$ sudo lvmdiskscan
/dev/fedora/root [ 50,00 GiB]
/dev/fedora/swap [ 3,77 GiB]
/dev/sda2 [ 500,00 MiB]
/dev/vg_maq01/lv_swap [ 5,75 GiB]
/dev/sda3 [ 118,75 GiB] LVM physical volume
/dev/vg_maq01/lv_home [ 63,00 GiB]
/dev/vg_maq01/lv_root [ 50,00 GiB]
/dev/fedora/home [ 48,48 GiB]
/dev/sdb2 [ 500,00 MiB]
/dev/sdb3 [ 194,87 GiB]
/dev/sdb4 [ 500,00 MiB]
/dev/sdb5 [ 102,24 GiB] LVM physical volume
6 disks
4 partitions
0 LVM physical volume whole disks
2 LVM physical volumes

The /dev/sda* is a SSD(KINGSTON SV200S3128G) 128GB, with old "Fedora 16-x86_64", and only want to recover some files in /home.

The /dev/sdb* is a Seagate(ST3320613AS) 320GB, running old "Fedora 20-x86_64", with some important file in /home.

$ sudo lvscan
ACTIVE '/dev/fedora/swap' [3,77 GiB] inherit
ACTIVE '/dev/fedora/home' [48,48 GiB] inherit
ACTIVE '/dev/fedora/root' [50,00 GiB] inherit
ACTIVE '/dev/vg_maq01/lv_swap' [5,75 GiB] inherit
ACTIVE '/dev/vg_maq01/lv_home' [63,00 GiB] inherit
ACTIVE '/dev/vg_maq01/lv_root' [50,00 GiB] inherit

$ mount | grep /dev/mapper
/dev/mapper/fedora-root on / type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/fedora-home on /home type ext4
(rw,relatime,seclabel,data=ordered)

Problem:
Want to mount the SSD on "Fedora 20" to recover some files, copying it to /dev/sdb3 space(/dev/sdb3 not used/mounted). After this, I can erase all SSD and install "Fedora 25" on it.

Thanks for help.

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For some reason I have to temporarily deactivate IPv6 interface configuration on a F22 server box.

According to documentation (or at least as I understood) it could be done either by adding

IPV6INIT=no
IPV6_AUTOCONF=no
to /etc/sysconfig/network-scripts/ifcfg-eth0

or

NETWORKING_IPV6=no
IPV6_AUTOCONF=no
to /etc/sysconfig/network

I tried both, executed "nmcli c reload", "systemctl restart NetworkManager", even rebooted the system. No change in network configuration. In ifconfig I have a local link address as well as a global address as advertised by the router and autoconfig based on mac address.

All those options are documented in usr/share/doc/initscripts/sysconfig.txt, so I guess these are still valid options.

Now I am wondering what I may have overlooked or missed?

Any hint appreciated.

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