This PR chnages allow user to configure VxLAN UDP
port number. By default we use 4789 port number. But this commit
will allow user to configure port number during swarm init.
VxLAN port can't be modified after swarm init.
Signed-off-by: selansen <elango.siva@docker.com>
If xfrm modules cannot be loaded:
- Create netlink.Handle only for ROUTE socket
- Reject local join on overlay secure network
Signed-off-by: Alessandro Boch <aboch@docker.com>
If a new network request is received for a prticular vni, cleanup the
interface with that vni even if it is inside a namespace. This is done
by collecting vni to namespace data during init and later using it to
delete the interface.
Also fixed a long pending issue of the vxlan interface not getting
destroyed even if the sandbox is destroyed. Fixed by first deleting the
vxlan interface first before destroying the sandbox.
Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
We check for existence of all filter rules in
overlay driver before creating it. We should
also do this for chain creation, because even though
we cleanup network chains when the last container
stops, there is a possibility of a stale network
chain in case of ungraceful restart.
Also cleaned up stale bridges if any exist due to
ungraceful shutdown of daemon.
Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
Currently we are cleaning up vxlan interfaces by name
before trying to setup an interface with the same name.
But this doesn't work for properly cleaning up vxlan
interfaces with the same vni, if the interface has a
a different name than the one expected. The fix is to
delete the interface based on vni.
Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
Add support for overlay networking in older kernels.
Following were done to achieve this:
+ Create the vxlan network in host namespace.
+ This may create conflicts with other private
networks so check for conflicts and fail a
join if there is any conflict.
+ Add iptable based filtering to only allow
subnet bridges in the same network to forward
traffic while different network bridges will
not be able to forward b/w each other. Also
block traffic to overlay network originating
from the host itself.
Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
Make sure to always explicitly set namespace for all
kernel bound network operations irrespective of whether
the operation is performed in init namespace or a user
defined namespace. This already happens for user defined
netns. But doesn't happen for initial netns that libnetwork
runs in.
Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
- Maps 1 to 1 with container's networking stack
- It holds container's specific nw options which
before were incorrectly owned by Endpoint.
- Sandbox creation no longer coupled with Endpoint Join,
sandbox and endpoint have now separate lifecycle.
- LeaveAll naturally replaced by Sandbox.Delete
- some pkg and file renaming in order to have clear
mapping between structure name and entity ("sandbox")
- Revisited hosts and resolv.conf handling
- Removed from JoinInfo interface capability of setting hosts and resolv.conf paths
- Changed etchosts.Build() to first write the search domains and then the nameservers
Signed-off-by: Alessandro Boch <aboch@docker.com>
This commit brings in the first implementation of
overlay driver which makes use of vxlan tunneling
protocol to create logical networks across multiple
hosts.
This is very much alpha code and should be used for
demo and testing purposes only.
Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
selansen