[Gluster-devel] Dynamically changing firewalld services

Kaushal M kshlmster at gmail.com
Mon Sep 7 04:01:13 UTC 2015 

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.

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 at gmail.com> wrote:
> On Fri, Sep 4, 2015 at 7:44 PM, Joe Julian <joe at julianfamily.org> 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 at redhat.com>
>> 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 at redhat.com>
>>> 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 at redhat.com>
>>>> 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 at gmail.com> wrote:
>>>>>>
>>>>>> On Mon, Aug 31, 2015 at 5:15 PM, Kaushal M <kshlmster at gmail.com> 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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>>>>> Gluster-devel at gluster.org
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>>>>>
>>>>>
>>>>>
>>>>>
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>>>>>
>>>>
>>>>
>>>
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>>
>> --
>> Sent from my Android device with K-9 Mail. Please excuse my brevity.
>>
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