This commit adds a guide for deploying Kubernetes NetworkPolicy support
to a cluster running Kilo.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit enables simultaneously managing IPv4 and IPv6 iptables
rules. This makes it possible to have peers with IPv6 allowed IPs in an
otherwise IPv4 stack and vice versa.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit introduces a the Kilo website. It is generated with
Docusaurus and can be deployed with standard services like Netlify.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit introduces a new document explaining how peers can use the
Kilo cluster VPN as a gateway to the internet.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit enables NAT-ing packets outgoing to the WAN from both the
Pod subnet as well as from peers. This means that Pods can access the
Internet and that peers can use the Kilo mesh as a gateway to the
Internet.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit better organizes the location of iptables rules. This is
made possible by exposing two new funcs, `NewRule` and `NewChain`.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit re-enables old functionality, which permitted the generation
of the configuration for a cluster without any peers.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit changes how Kilo allows nodes and peers behind NAT to roam.
Rather that ignore changes to endpoints when comparing WireGuard
configurations, Kilo now incorporates changes to endpoints for peers
behind NAT into its configuration first and later compares the
configurations.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit documents the use of the persistent-keepalive annotation and
corrects the implementation of keepalives.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
Kilo had a routine that synchronized the endpoints of peers back into
the API to ensure that endpoints updated by WireGuard for a roaming peer
would always positively compare with the endpoints in the API. This is
no longer needed as Kilo will now simply ignore changes to endpoints for
peers with a non-zero persistent keepalive.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit enables Kilo to ignore changes to the endpoints of peers
that sit behind a NAT gateway. We use the heuristic of a non-zero
persistent keepalive to decide whether the endpoint field should be
ignored. This will allow NATed peers to roam and for every node in the
cluster to have a different value for a peer's endpoint, as is natural
when a peer's connections are NATed.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit fixes the issue encountered in #36, where the CNI config is
touched even though CNI management is disabled.
Fixes: #36
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit allows DNS names to be used when specifying the endpoint
for a node in the WireGuard mesh. This is useful in many scenarios, in
particular when operating an IoT device whose public IP is dynamic. This
change allows the administrator to use a dynamic DNS name in the node's
endpoint.
One of the side-effects of this change is that the WireGuard port can
now be specified individually for each node in the mesh, if the
administrator wishes to do so.
*Note*: this commit introduces a breaking change; the
`force-external-ip` node annotation has been removed; its functionality
has been ported over to the `force-endpoint` annotation. This annotation
is documented in the annotations.md file. The expected content of this
annotation is no longer a CIDR but rather a host:port. The host can be
either a DNS name or an IP.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit entirely replaces NAT in Kilo with a few iproute2 rules.
Previously, Kilo would source-NAT the majority of packets in order to
avoid problems with strict source checks in cloud providers causing
packets to be considered martians. This source-NAT-ing made it
difficult to correctly apply Kuberenetes NetworkPolicies based on source
IPs.
This rewrite instead relies on a handful of iproute2 rules to ensure
that packets get encapsulated in certain scenarios based on the source
network and/or source interface.
This has the benefit of avoiding extra iptables bloat as well as
enabling better compatibility with NetworkPolicies.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit cleans up the iptables package to allow other packages to
create rules.
This commit also removes all NAT from Kilo.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit fixes the ip allocator `newAllocator` to produce IP
addresses with the original network mask. This is makes more sense. The
original functionality can be reproduced by wrapping the produced IP
address with the `oneAddressCIDR` helper.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit modifies the build tooling so that we use the official
alipne build images rather than the images from the multiarch org. This
requires new logic to parse docker manifests but results in a cleaner
solution with fewer architecture definitions.
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit updates the well-known label to determine the region of the
node to topology.kubernetes.io/region, which is the new standard as
defined by the Kubernetes documentation, now that
failure-domain.beta.kubernetes.io/region has been deprecated.
The certificates for the alpine APK repositories expired today [0],
breaking builds. This switches the configured repos to ones that work.
It also changes the `main` repo to use HTTPS.
[0] uk.alpinelinux.org expired Nov 15 2019 at 02:00:31 UTC
Signed-off-by: Lucas Servén Marín <lserven@gmail.com>
This commit takes a big step towards ensuring that iptables rules are
always kept in the correct order. Specifically, when re-setting a a
ruleset, any time a rule is missing, that rule and all following rules
are re-added to ensure that from that index onwards all rules are in the
right order. Similarly, when reconciling an existing ruleset against the
backend, if a rule is missing, that rule an all following rules are
re-added.
This change does not guarantee that the order of rules in the backend
is correct. Unless an actor is modifying the order of rules in iptables,
all rules created by Kilo should now be kept in the correct order.
Fixes: #19
