The application was exposing REST endpoints and querying other services on the platform, collecting, processing and returning the data to the client. Pod to pod communication is disrupted with routing problems. Perhaps I am missing some configuration bits? The network infrastructure is not aware of the IPs inside each Docker host and therefore no communication is possible between containers located on different hosts (Swarm or other network backends are a different story). find the least used IPs of the pool and replace the source IP in the packet with it, check if the port is in the allowed port range (default, the port is not available so ask the tcp layer to find a unique port for SNAT by calling, copy the last allocated port from a shared value. docker - Kubernetes Connection Timeout - Stack Overflow Click KUBERNETES OBJECT STATUS to see the object status updates. rev2023.4.21.43403. When the container memory limit is reached, the application becomes intermittently inaccessible, and the container is killed and restarted. How did the Quake demo from DockerCon Work? Access stateful headless kubernetes externally? Created on April 25, 2023. # Note some distributions may have this compiled with kernel, # check with cat /lib/modules/$(uname -r)/modules.builtin | grep netfilter. Kubernetes deprecates the support of Basic authentication model from Kubernetes 1.19 onwards. Every other week we'll send a newsletter with the latest cybersecurity news and Teleport updates. This On Kubernetes, this means you can lose packets when reaching ClusterIPs. The network capture showed the first SYN packet leaving the container interface (veth) at 13:42:23.828339 and going through the bridge (cni0) (duplicate line at 13:42:23.828339). Google Password Manager securely saves your passwords and helps you sign in faster with Android and Chrome, while Sign in with Google allows users to sign in to a site or app using their Google Account. StatefulSets ordinals provide sequential identities for pod replicas. After you learn the memory usage, you can update the memory limits on the container. How to Make a Black glass pass light through it? I want to thank Christian for the initial debugging session, Julian, Dennis, Sebastian and Alexander for the review, Stories about building a better working world, Software Engineer at Wellfound (formerly AngelList Talent), https://github.com/maxlaverse/snat-race-conn-test, The packet leaves the container and reaches the Docker host with the source set to, The response packet reaches the host on port, container-1 tries to establish a connection to, container-2 tries to establish a connection to, The packet from container-1 arrives on the host with the source set to, The packet from container-2 arrives the host with the source set to, The remote service answers to both connections coming from, The Docker host receives a response on port. When a gnoll vampire assumes its hyena form, do its HP change? We took some network traces on a Kubernetes node where the application was running and tried to match the slow requests with the content of the network dump. {0..k-1} in a source cluster, and scale up the complementary range {k..N-1} Making statements based on opinion; back them up with references or personal experience. You can achieve this with Calico for example, but not with Flannel at least in host-gw mode. Those entries are stored in the conntrack table (conntrack is another module of netfilter). This value is used a starting offset for the search, update the shared value of the last allocated port and return, using some randomness when settings the port allocation search offset. 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Also, check the AKS subnet. After a few adjustment runs we were able to reproduce the issue on a non-production cluster. Connect and share knowledge within a single location that is structured and easy to search. that are not relevant in destination cluster are removed (eg: uid, and from Pods in either clusters. enables you to retain at most one semantics (meaning there is at most one Pod What this translation means will be explained in more details later in this post. Fix intermittent time-outs or server issues during app access - Azure Again, the packet would be seen on the container's interface, then on the bridge. On default Docker installations, each container has an IP on a virtual network interface (veth) connected to a Linux bridge on the Docker host (e.g cni0, docker0) where the main interface (e.g eth0) is also connected to (6). ET. For the external service, it looks like the host established the connection itself. Tcpdump could show that lots of repeated SYN packets are sent, but no ACK is received. 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Kubernetes, connection timeouts, and the importance of labels The race can happen when multiple containers try to establish new connections to the same external address concurrently. First to modify the packet structure by changing the source IP and/or PORT (2) and then to record the transformation in the conntrack table if the packet was not dropped in-between (4).
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