When firewalld (or iptables service) restarts/reloads,
all previously added docker firewall rules are flushed.
With firewalld we can react to its Reloaded() [1]
D-Bus signal and recreate the firewall rules.
Also when firewalld gets restarted (stopped & started)
we can catch the NameOwnerChanged signal [2].
To specify which signals we want to react to we use AddMatch [3].
Libvirt has been doing this for quite a long time now.
Docker changes firewall rules on basically 3 places.
1) daemon/networkdriver/portmapper/mapper.go - port mappings
Portmapper fortunatelly keeps list of mapped ports,
so we can easily recreate firewall rules on firewalld restart/reload
New ReMapAll() function does that
2) daemon/networkdriver/bridge/driver.go
When setting a bridge, basic firewall rules are created.
This is done at once during start, it's parametrized and nowhere
tracked so how can one know what and how to set it again when
there's been firewalld restart/reload ?
The only solution that came to my mind is using of closures [4],
i.e. I keep list of references to closures (anonymous functions
together with a referencing environment) and when there's firewalld
restart/reload I re-call them in the same order.
3) links/links.go - linking containers
Link is added in Enable() and removed in Disable().
In Enable() we add a callback function, which creates the link,
that's OK so far.
It'd be ideal if we could remove the same function from
the list in Disable(). Unfortunatelly that's not possible AFAICT,
because we don't know the reference to that function
at that moment, so we can only add a reference to function,
which removes the link. That means that after creating and
removing a link there are 2 functions in the list,
one adding and one removing the link and after
firewalld restart/reload both are called.
It works, but it's far from ideal.
[1] https://jpopelka.fedorapeople.org/firewalld/doc/firewalld.dbus.html#FirewallD1.Signals.Reloaded
[2] http://dbus.freedesktop.org/doc/dbus-specification.html#bus-messages-name-owner-changed
[3] http://dbus.freedesktop.org/doc/dbus-specification.html#message-bus-routing-match-rules
[4] https://en.wikipedia.org/wiki/Closure_%28computer_programming%29
Signed-off-by: Jiri Popelka <jpopelka@redhat.com>
Firewalld [1] is a firewall managing daemon with D-Bus interface.
What sort of problem are we trying to solve with this ?
Firewalld internally also executes iptables/ip6tables to change firewall settings.
It might happen on systems where both docker and firewalld are running
concurrently, that both of them try to call iptables at the same time.
The result is that the second one fails because the first one is holding a xtables lock.
One workaround is to use --wait/-w option in both
docker & firewalld when calling iptables.
It's already been done in both upstreams:
b315c380f4b3b451d6f8
But it'd still be better if docker used firewalld when it's running.
Other problem the firewalld support would solve is that
iptables/firewalld service's restart flushes all firewall rules
previously added by docker.
See next patch for possible solution.
This patch utilizes firewalld's D-Bus interface.
If firewalld is running, we call direct.passthrough() [2] method instead
of executing iptables directly.
direct.passthrough() takes the same arguments as iptables tool itself
and passes them through to iptables tool.
It might be better to use other methods, like direct.addChain and
direct.addRule [3] so it'd be more intergrated with firewalld, but
that'd make the patch much bigger.
If firewalld is not running, everything works as before.
[1] http://www.firewalld.org/
[2] https://jpopelka.fedorapeople.org/firewalld/doc/firewalld.dbus.html#FirewallD1.direct.Methods.passthrough
[3] https://jpopelka.fedorapeople.org/firewalld/doc/firewalld.dbus.html#FirewallD1.direct.Methods.addChainhttps://jpopelka.fedorapeople.org/firewalld/doc/firewalld.dbus.html#FirewallD1.direct.Methods.addRule
Signed-off-by: Jiri Popelka <jpopelka@redhat.com>
Check test correctness of untar by comparing destination with
source. For part 2, it checkes hashes of source and destination
files or the target files of symbolic links.
This is a supplement to the #11601 fix.
Signed-off-by: Yestin Sun <sunyi0804@gmail.com>
Instead of seeding/polluting the global random instance,
creating a local `rand.Random` instance which provides the same
level of randomness.
Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>
After finding our initial thinking on env. space versus arg list space
was wrong, we need to solve this by using a pipe between the caller and
child to marshall the (potentially very large) options array to the
archiver.
Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp)
As reported in #11294, the Docker daemon will execute contains it
shouldn't run in the event that a requested tag is present in an image's
ID. This leads to the wrong image being started up silently.
This change reduces the risk of such a collision by using the short ID
iff the actual revOrTag looks like a short ID (not that it necessarily
is).
Signed-off-by: Richard Burnison <rburnison@ebay.com>
Check test correctness of untar by comparing destination with
source. For part one, it only compares the directories.
This is a supplement to the #11601 fix.
Signed-off-by: Yestin Sun <yestin.sun@polyera.com>
Corrected integer size passed to Windows
Corrected DisableEcho / SetRawTerminal to not modify state
Cleaned up and made routines more idiomatic
Corrected raw mode state bits
Removed duplicate IsTerminal
Corrected off-by-one error
Minor idiomatic change
Signed-off-by: Brendan Dixon <brendand@microsoft.com>
UdevWait() is deferred and takes uint cookie as an argument. As arguments
to deferred functions are calculated at the time of call, it is possible
that any update to cookie later by libdm are not taken into account when
UdevWait() is called. Hence use a pointer to uint as argument to UdevWait()
function.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
