On 09/07/2015 05:08 PM, Joe Julian
wrote:
On 09/06/2015 09:01 PM, Kaushal M wrote:
After more investigation and further
discussions (sorry these happened
internally), what I've found is that there is no way currently
to
dynamically change a firewalld service in runtime without side
effects. I'll be opening an RFE for this with firewalld, and see
where
it goes.
What are these side-effects?
Below Issues are dynamically handling ports :
In firewalld:
1. Dynamically service update is not supported in firewalld( as per
my knowledge we can't do it using D-bus also)
2. We can do dynamically add/ remove port from zone but if admin
wants change the zone , then restart volume is required to open
ports in new zone and manually admin has to remove ports from old
zone.
In Glusterd :
1.mount may fail : hook script runs after brick start and it runs in
back ground , due to this there will chance that volume mount fail
(brick is started but port not yet opened ).
Note :ports of the bricks are known after commit(i.e brick start)
2. io error in client during add-brick: Brick is started and
notified to client about new brick but port is not yet opened for
that brick then it leads to io error in client which causes the data
lost.
3. Selinux : SELinux permission required to run firewalld commands
in hook script.
Considering all these the best approach IMO is to statically open
up a range of ports for the bricks( I have seen some other
applications doing the same).
For now, our best option is to open up a range of ports
statically in
our service file. This isn't the best solution, but I've seen
some
other applications doing the same. This also avoids some selinux
issues we saw during our tests. If no one has any objections to
this
we can proceed with this.
~kaushal
On Mon, Sep 7, 2015 at 9:25 AM, Kaushal M
<kshlmster@xxxxxxxxx> wrote:
On Fri, Sep 4, 2015 at 7:44 PM, Joe
Julian <joe@xxxxxxxxxxxxxxxx> wrote:
As an upstream admin, one of the
things I abhor about debian/ubuntu is how
services are enabled upon installation. I sure hope
Fedora/EL doesn't follow
their broken example.
Can we enable the static firewall rule in glusterd.service?
Joe,
The services we are talking about are firewalld services, not
systemd
services. A firewalld service is a collection of firewall
rules for an
application, which the application can ship with it. The admin
is free
to enable/disable these services on the networks they want
(not
directly, but through firewalld zones). A firewalld service
cannot be
enabled automatically, and requires admin to do it. I hope
this
answers your question.
~kaushal
On September 4, 2015 6:37:15 AM PDT, Christopher Blum
<cblum@xxxxxxxxxx>
wrote:
Wasn't the idea behind this all that
we have the necessary firewall rules
active by default? Why would an admin install Gluster, but
NOT allow it to
work?
Do you know if we will have the service pre-enabled after
the install of
RHGS3.1.1?
Christopher Blum
Associate Storage Consultant
Global Storage Consulting, Red Hat
+49 711 96 43 7009
On Fri, Sep 4, 2015 at 2:05 PM, Anand Nekkunti
<anekkunt@xxxxxxxxxx>
wrote:
On 09/04/2015 05:20 PM, Christopher Blum wrote:
Where do you add the services to the zone? I couldn't
find that in your
code...
By default it is not attached to any zone, admin
has to enable
glusterfs-static service to his/her active zone after
installation.
Christopher Blum
Associate Storage Consultant
Global Storage Consulting, Red Hat
+49 711 96 43 7009
On Fri, Sep 4, 2015 at 5:37 AM, Anand Nekkunti
<anekkunt@xxxxxxxxxx>
wrote:
see comments below
On 09/01/2015 02:47 PM, Anand Nekkunti wrote:
Hi All
From firewalld doc and my experiments , I understood
that we don't have
any option to add/remove port to/from service
runtime/permanent (this can
double for zone) . The only way is modifying service
xml file but it
requires firewall reload (which cause the loosing run
time settings).
Is there any way to reload firewall without
loosing run time
settings or is there any way to reload particular
service.
Regards
Anand.N
On 09/01/2015 12:49 PM, Christopher Blum wrote:
There is a function in the d-bus interface:
getZoneOfInterface(s: interface) → s
that will return the current zone of the interface and
you can then add
ports to that interface.
As far as I see it, the hooks get only executed when I
start the volume,
right? So when I created and started the volume, but
then change the zone of
the interface, we need to detect that (I guess it
would be enough to handle
that on reboot) and move the ports/services to the new
zone.
Regarding Org.fedoraproject.firewalld1.config.service
- I think that
would need additional tests if that is really only for
the persistent
config, or if the changes are also applied in the
running config.
Christopher Blum
Associate Storage Consultant
Global Storage Consulting, Red Hat
+49 711 96 43 7009
On Tue, Sep 1, 2015 at 8:58 AM, Kaushal M
<kshlmster@xxxxxxxxx> wrote:
On Mon, Aug 31, 2015 at 5:15
PM, Kaushal M <kshlmster@xxxxxxxxx> wrote:
Hi all,
I wanted know if there is any existing information
on how to manage
dynamically changing services using firewalld. If
there are none
existing, could you please let us know if the
approach we're
following
below is correct.
We want to provide firewalld service configuration
for GlusterFS. One
of the properties of GlusterFS is that it has a
set of fixed ports,
and a set of dynamic ports, which need to be
opened.
We propose to ship 2 firewalld services with
GlusterFS.
- glusterfs-static - This contains the list of
static ports that
should be opened up. This is placed in
/usr/lib/firewalld/services
- glusterfs-dynamic - This will contain the list
of dynamic ports.
This will be shipped empty, and be placed in
/etc/firewalld/services
.
The ports in this service will be kept updated by
a couple of
scripts,
which hook into the glusterfs start/stop events.
The scripts, add or remove ports from the
glusterfs-dyanmic.xml file,
and call `firewall-cmd --reload` to have firewalld
reload
configuration. We do it this way, instead of using
a dbus call
because
we want the configuration to be persisted, and
also applied live.
We've tested this, and this works. But we'd like
to validate this
solution with you guys.
Do you see any issues with our approach? Is there
anything we could
do
to improve the solution.
For reference, the glusterfs bug and proposed
solution are available
at [1] and [2].
Thanks.
Kaushal
[1]
https://bugzilla.redhat.com/show_bug.cgi?id=1253967
[2] http://review.gluster.org/11989
PS: Apologies if I should have posted this to the
users list instead.
I've had a private conversation with Christopher
Blum (CCd), who
identified a major flaw with our current solution.
Having firewalld
reload will cause any runtime rules that were set to
be lost. This
should be avoided at all costs.
Chris suggested using firewalld dbus commands [1]
which could solve
this. We have dbus commands to add/remove ports from
a service
permanently. This is an alternative to updating the
service xml files.
But we don't see a method to update a service during
runtime.
There are dbus commands to add/remove ports to zones
during runtime.
But this is not useful as we wouldn't know which
zone to apply it to.
One of the reasons we chose to use services was
this.
So now we have two questions,
1. Is there a way to do a runtime modification of a
firewalld service
it seems firewalld not supporting for
run time service
update, but we can add and remove ports
from zone
2. If not, is there a easy way
to get active zones, which have our
services enabled and add/remove ports from them.
we can get the services which are enabled
in zone using below
command
firewall-cmd --zone=$zone --list-services
I have updated hook script in my patch[1]
, it identify the
zones which have gluster services enabled and it
add/remove the port in
zone(s) so that we can avoid
firewall reload. I have tested this script
with different
test cases
[1].http://review.gluster.org/#/c/11989/
Thanks.
Kaushal
[1] https://www.mankier.com/5/firewalld.dbus
[2]
https://www.mankier.com/5/firewalld.dbus#Interfaces-Org.fedoraproject.firewalld1.config.service
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