cilium | eBPF-based Networking , Security , and Observability | Networking library

 by   cilium Go Version: v1.14.0-snapshot.3 License: Apache-2.0

kandi X-RAY | cilium Summary

kandi X-RAY | cilium Summary

cilium is a Go library typically used in Networking applications. cilium has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

eBPF-based Networking, Security, and Observability

            kandi-support Support

              cilium has a medium active ecosystem.
              It has 15642 star(s) with 2228 fork(s). There are 310 watchers for this library.
              There were 10 major release(s) in the last 12 months.
              There are 980 open issues and 6768 have been closed. On average issues are closed in 145 days. There are 223 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of cilium is v1.14.0-snapshot.3

            kandi-Quality Quality

              cilium has 0 bugs and 0 code smells.

            kandi-Security Security

              cilium has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              cilium code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              cilium is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              cilium releases are available to install and integrate.
              It has 321205 lines of code, 16399 functions and 2219 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

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            Get all kandi verified functions for this library.

            cilium Key Features

            No Key Features are available at this moment for cilium.

            cilium Examples and Code Snippets

            No Code Snippets are available at this moment for cilium.

            Community Discussions


            Split a dataframe column containing delimited strings into multiple columns and retain specific portions of the split strings
            Asked 2022-Apr-16 at 11:43

            I have a dataframe df which contains a single column GO. Each row in df contains either one term or multiple terms (separated by ;) and each term has a specific format - it starts with either P, C or F and is followed by a : and then the actual term.



            Answered 2022-Apr-16 at 07:52

            A tidyverse approach to achieve your desired result may look like so:



            eBPF sockops + redirection: Why we don't need DELETE elements from the sockmap?
            Asked 2022-Mar-17 at 04:15

            I am learning loopback TCP acceleration technique based on the eBPF sockmap / redirection.

            I've found that in all the relevant articles and examples, it seems that we just need to add entries to the sockmap table via the bpf_sock_hash_update method, then look up the table and redirect via the bpf_msg_redirect_hash method. For example: here, here, and here.

            I didn't find any code to delete entries from the sockmap table (eg: call bpf_map_delete_elem etc). At the same time, I also haven't found any code in the kernel that automatically deletes entries for the closed tcp connections, for example: here.

            So I'm curious, why is there no need to delete sockmap entries for closed connections in these articles and code?

            And do we need to detect TCP FIN events in our ebpf code and then explicitly delete the corresponding entry in the sockmap?

            Thanks :-)



            Answered 2022-Mar-17 at 04:15

            After some testing, I realized that there is no need to manually delete the entries in the sockmap table.

            By observing the entries in the sockmap table using bpftool map dump id | grep "key:" | wc -l command, you can see that the table size is always equal to twice the number of concurrent TCP connections on the loopback device.

            So obviously closed TCP connections are automatically removed from the sockmap table.



            k8s network policy blocks DNS
            Asked 2022-Mar-16 at 15:50

            I am trying to enable DNS for my pods with network policy. I am using

            When DNS works:



            Answered 2021-Oct-14 at 11:32

            the port is overwriten by the dns service to 8053. the tcpdumper is running inside the pod, so it does not know it is re-routed .



            Unable to unload BPF program
            Asked 2022-Feb-09 at 10:03

            I am unable to unload a BPF program from code. I am using the Cilium eBPF library to load the program and netlink to add the BPF function to an interface. Here's what I'm doing:



            Answered 2022-Feb-09 at 08:31

            eBPF programs only unload when there are no more references to it(File descriptors, pins), but network links also hold their own references. So to unload the program, you first have to detach it from your network link.

            You can do so by setting the program fd to -1:



            Why can't Go find these source files?
            Asked 2022-Feb-04 at 19:56

            I'm trying to compile kaniko on a raspberry pi.

            I don't program in golang, but I was able to compile kaniko successfully a few weeks ago on the same raspberry pi, and even wrote myself a guide of the steps to follow, but now, following the same steps, something is broken.

            kaiko requires go, but a more recent version of go then found in the raspberry pi repos, so I download and install go from scratch. go requires go to compile, so I first install it (an older version) from the repos, and then remove it after it's done compiling a more recent version of itself:

            Install go:



            Answered 2022-Feb-04 at 19:56

            Based on the comments, my suggestion is to add $HOME/go/bin to the path and use the default GOPATH.

            Go mod depends on the bin directory inside the GOPATH. It installs new packages there. The go binary itself can actually reside somewhere else. If you follow these install instruction, go itself will actually be in /usr/local/go but the GOPATH is still $HOME/go.

            I would also recommend, not involving apt in this at all. This looks like trouble in the form of conflicts with different installations.



            GKE Dataplane v2 NetworkPolicies not working
            Asked 2022-Jan-04 at 14:17

            I am currently trying to move my calico based clusters to the new Dataplane V2, which is basically a managed Cilium offering. For local testing, I am running k3d with open source cilium installed, and created a set of NetworkPolicies (k8s native ones, not CiliumPolicies), which lock down the desired namespaces.

            My current issue is, that when porting the same Policies on a GKE cluster (with DataPlane enabled), those same policies don't work.

            As an example let's take a look into the connection between some app and a database:



            Answered 2022-Jan-04 at 14:17

            Update: I was able to solve the mystery and it was ArgoCD all along. Cilium is creating an Endpoint and Identity for each object in the namespace, and Argo was deleting them after deploying the applications.

            For anyone who stumbles on this, the solution is to add this exclusion to ArgoCD:



            Allow egress from a Kubernetes pod to only specific FQDN/DNS with Azure CNI Network Policies
            Asked 2021-Oct-21 at 20:54

            How can egress from a Kubernetes pod be limited to only specific FQDN/DNS with Azure CNI Network Policies?

            This is something that can be achieved with:




            Answered 2021-Oct-20 at 04:53

            Apply K8s network policies




            bpf verifier log is truncated, how to get the full log?
            Asked 2021-Aug-22 at 07:06

            As the following, bpf verifier log is truncated at the last. How could I get the full log ?



            Answered 2021-Aug-17 at 10:23

            You need to pass a larger buffer (and to indicate its length accordingly) to the verifier when you load your program.

            The kernel receives a pointer to a union bpf_attr, which for loading programs starts like this:



            bpf_xdp_adjust_meta() returns errcode -13 (permission denied)
            Asked 2021-Aug-09 at 08:16

            bpf_xdp_adjust_meta(ctx, -delta); is returning error code -13 (permission denied) when delta > 32.
            But BPF and XDP Reference Guide states that there are 256 bytes headroom for metadata.
            So did I misunderstand something or how can I use 256 bytes for metadata?

            Program: ...


            Answered 2021-Aug-09 at 08:16

            The maximum room space for metadata is only 32 bytes, so what you observe is expected.

            You can check this by reading the relevant kernel code, or the logs for the commit that introduced the feature.

            The documentation that you cited refers to the room size for encapsulation headers that you can modify with bpf_xdp_adjust_head(), not to the size for metadata. Admittedly it's not clear from the text (but PRs are welcome!).



            GKE Internal Ingress for Headless Service
            Asked 2021-Jun-11 at 11:12

            I'm trying to create an internal ingress for inter-cluster communication with gke. The service that I'm trying to expose is headless and points to a kafka-broker on the cluster.

            However when I try to load up the ingress, it says it cannot find the service?



            Answered 2021-Jun-11 at 11:12

            Setting up ingress for internal load balancing requires you to configure a proxy-only subnet on the same VPC used by your GKE cluster. This subnet will be used for the load balancers proxies. You'll also need to create a fw rule to allow traffic as well.

            Have a look at the prereqs for ingress and then look here for info on how to setup the proxy-only subnet for your VPC.


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

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