sidecar | Some old C code I developed while at MIT

by bradhowes C++ Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | sidecar Summary

sidecar is a C++ library. sidecar has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

The main goal of the Radar SideCar software project is to create a highly adaptable environment for running signal processing algorithms. Users configure signal processing streams using XML configuration files that define how information flows from algorithm to algorithm and how data flows from machine to machine in the SideCar LAN.

Support

Quality

Security

License

Reuse

Support

sidecar has a low active ecosystem.

It has 22 star(s) with 9 fork(s). There are 5 watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 2 have been closed. On average issues are closed in 23 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of sidecar is current.

Quality

sidecar has no bugs reported.

Security

sidecar has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

sidecar is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

sidecar releases are not available. You will need to build from source code and install.

Installation instructions, examples and code snippets are available.

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sidecar Key Features

No Key Features are available at this moment for sidecar.

sidecar Examples and Code Snippets

No Code Snippets are available at this moment for sidecar.

Community Discussions

Trending Discussions on sidecar

kubernetes init container for spark-submit

How to make a conditional proxy_pass within NGINX

Istio service to service communication

CloudSQL Proxy on GKE : Service vs Sidecar

Linkerd inbound port annotation leads to "Failed to bind inbound listener"

use php to loop csv data and display subjects by topic and topic by category

Get pods in Kubernetes where all containers are "ready" in one line using kubectl

Use sidecar to translate opaque token to JWT in Istio

Unable to log egress traffic HTTP requests with the istio-proxy

How to provide access to a pod so that it can list and get other pods and other resource in the namespaces/cluster

QUESTION

kubernetes init container for spark-submit

Asked 2022-Mar-31 at 22:05

I am trying to run a spark-submit to the Kubernetes cluster with spark 3.2.1 image and it is working. Now my question is, can I execute an init container along with the spark-submit? What am trying to achieve is that the init container check another service is up or not, is it up then spark-submit will run or it fail.

I can see that a conf parameter "spark.kubernetes.initContainer.image" for spark version 2.3 but not for 3.2.1 (https://spark.apache.org/docs/2.3.0/running-on-kubernetes.html)

is there any mechanism that I can use to check other services are up or not before I submit a spark job?

I can see init container usage for the spark in the below links but it is not providing an accurate answer

https://docs.bitnami.com/kubernetes/infrastructure/spark/configuration/configure-sidecar-init-containers/ https://doc.lucidworks.com/spark-guide/11153/running-spark-on-kubernetes

any help will be much appreciated, thanks.

...

ANSWER

Answered 2022-Feb-18 at 07:46

You don't mention if the other service is in the same container or not but the principles are the same. It's covered in the docs here and gives this example which defines a simple Pod that has two init containers. The first waits for myservice, and the second waits for mydb. Once both init containers complete, the Pod runs the app container from its spec section.

Source https://stackoverflow.com/questions/71169528

QUESTION

How to make a conditional proxy_pass within NGINX

Asked 2022-Mar-18 at 17:21

I am running our front and backend on K8s, this question is regarding our front-end setup using NGINX.

I am trying to find a way to gather metrics of my main front-end container (nginx + front-end) using a sidecar container that adjusts the stub_status running on /stub_status on port 8080 values to key value pairs for my application. Just so that I can scrape them using Prometheus on the sidecars /metrics on port 9113.

I want to block traffic for stub_staus outside of the pod, as only the sidecar needs to be able to reach it and I am trying to block /metrics from outside the platform (hence an example random 172 range address as an example). If I instead of a proxy pass (see below) use return 444 or 404 I get a nice big fat error. However, our front-end can handle 404 in a nice (graceful) way making it so you do not even exit the front-end but simply get a user friendly 404 message whilst staying in the front-end application, and end up on location/404. This also makes it appear like there is nothing on the /stub_status or /metrics. Which is nice to have.

I tried to do a rewrite ^/metrics$ to a /404 (for example) but that simply got me an NGINX 404 instead. Maybe it has something to do with the fact that /metrics runs on 9113 and there is nothing listening tot /404 on 9113. I am not sure about this.

I know the proxy pass example below is not possible within an IF statement, as I get the following error "proxy_pass" cannot have URI part in location given by regular expression, or inside named location, or inside "if" statement, or inside "limit_except" block in". However, below is to illustrate what I am trying to do. I am just not sure how to get it to behave like this.

Thanks in advance!

HTTP Block

...

ANSWER

Answered 2022-Mar-18 at 17:21

After more testing I found out the following works really well:

HTTP BLOCK

Source https://stackoverflow.com/questions/71382360

QUESTION

Istio service to service communication

Asked 2022-Mar-16 at 19:08

I am new to Istio and I am trying to communicate 2 spring boot applications with Istio: component with requirement.

I have installed Istio 1.13.2 on a GKE cluster with the demo profile:

...

ANSWER

Answered 2022-Mar-16 at 19:08

i am not sure why istio ingress controller coming inbetween for you.

You should checkout this nice simple example : https://istio.io/latest/docs/examples/bookinfo/#deploying-the-application

In istio example, you can see review service sending the request to rating service.

So for connection or service to service communication, you can use the just service name.

So if you check the review service source you will get an idea of how services calling other services.

Java example :

https://github.com/istio/istio/blob/master/samples/bookinfo/src/reviews/reviews-application/src/main/java/application/rest/LibertyRestEndpoint.java#L42

Python example :

https://github.com/istio/istio/blob/master/samples/bookinfo/src/productpage/productpage.py#L61

So for you end flow will be something like

Source https://stackoverflow.com/questions/71502591

QUESTION

CloudSQL Proxy on GKE : Service vs Sidecar

Asked 2022-Mar-16 at 15:38

Does anyone know the pros and cons for installing the CloudSQL-Proxy (that allows us to connect securely to CloudSQL) on a Kubernetes cluster as a service as opposed to making it a sidecar against the application container?

I know that it is mostly used as a sidecar. I have used it as both (in non-production environments), but I never understood why sidecar is more preferable to service. Can someone enlighten me please?

...

ANSWER

Answered 2022-Mar-15 at 13:19

The Cloud SQL Auth proxy is the recommended way to connect to Cloud SQL, even when using private IP. This is because the Cloud SQL Auth proxy provides strong encryption and authentication using IAM, which can help keep your database secure.

When you connect using the Cloud SQL Auth proxy, the Cloud SQL Auth proxy is added to your pod using the sidecar container pattern. The Cloud SQL Auth proxy container is in the same pod as your application, which enables the application to connect to the Cloud SQL Auth proxy using localhost, increasing security and performance.

As sidecar is a container that runs on the same Pod as the application container, because it shares the same volume and network as the main container, it can “help” or enhance how the application operates. In Kubernetes, a pod is a group of one or more containers with shared storage and network. A sidecar is a utility container in a pod that’s loosely coupled to the main application container.

Sidecar Pros: Scales indefinitely as you increase the number of pods. Can be injected automatically. Already used by serviceMeshes.

Sidecar Cons: A bit difficult to adopt, as developers can't just deploy their app, but deploy a whole stack in a deployment. It consumes much more resources and it is harder to secure because every Pod must deploy the log aggregator to push the logs to the database or queue.

Refer to the documentation for more information.

Source https://stackoverflow.com/questions/71480852

QUESTION

Linkerd inbound port annotation leads to "Failed to bind inbound listener"

Asked 2022-Mar-07 at 10:47

We are using Linkerd 2.11.1 on Azure AKS Kubernetes. Amongst others there is a Deployment using using an Alpine Linux image containing Apache/mod_php/PHP8 serving an API. HTTPS is resolved by Traefik v2 with cert-manager, so that in coming traffic to the APIs is on port 80. The Linkerd proxy container is injected as a Sidecar.

Recently I saw that the API containers return 504 errors during a short period of time when doing a Rolling deployment. In the Sidecars log, I found the following :

...

ANSWER

Answered 2022-Mar-04 at 01:07

        annotations = {
          "config.linkerd.io/inbound-port" = "80"
        }

Source https://stackoverflow.com/questions/71310780

QUESTION

use php to loop csv data and display subjects by topic and topic by category

Asked 2022-Mar-02 at 22:16

This is var_dump($data); from the csv file

...

ANSWER

Answered 2022-Mar-02 at 22:16

$src_file = $_SERVER["DOCUMENT_ROOT"] . "\\include\\excel.csv";
$row = 1;
$count = 0;

if (($src_file_handle = fopen($src_file, "r")) !== FALSE) {
    $current_category = '';
    $current_topic = '';
    while (($data = fgetcsv($src_file_handle, 0, ",")) !== FALSE) {
        if ($count == 0) 
            $count++;
        else {
            $skip_category = ($current_category != $data[3]) ? false : true;
            $skip_topic = ($current_topic != $data[1]) ? false : true;

            echo (!$skip_category) ? "" : "";
            echo (!$skip_category) ? "" . $data[3] . "" : "";
            echo (!$skip_topic) ? " " . $data[1] . "" : "";
            echo "  " . $data[2] . "";
            echo (!$skip_category) ? "" : "";

            $current_category = $data[3];
            $current_topic = $data[1];
        }
    }
    fclose($src_file_handle);
}

Source https://stackoverflow.com/questions/71166871

QUESTION

Get pods in Kubernetes where all containers are "ready" in one line using kubectl

Asked 2022-Feb-17 at 11:01

We have cluster with Istio and also Jenkins job to get "stable" pods, which uses this kubectl query:

...

ANSWER

Answered 2022-Feb-16 at 21:09

What about something like this?

Source https://stackoverflow.com/questions/71144976

QUESTION

Use sidecar to translate opaque token to JWT in Istio

Asked 2022-Feb-16 at 10:56

I consider if there is a way to use Istio to translate opaque token to JWT.

Use case: There are two services (service 1 which is consumer and service 2 which is producer) Service1 works with opaque token, Service2 can be authenticate & authorize with JWT token. To avoid adding Opaque token authentication in service2 I consider if we can use sidecar pattern (exactly in Istio) to get request (re1) from service1, extract authorization header, pass request (authReq1) to authorization server for exchange opaque token to JWT and then pass request (req1 but with JWT instead of original Opaque Token) to service2.

Edited answer: I see two option (option1, option2) but I am interested in option 3.

Option 1: Option 2: Option 3:

...

ANSWER

Answered 2022-Feb-15 at 14:48

I consider if there is a way to use Istio to translate opaque token to JWT.

Unfortunately, Istio won't be able to translate the tokens. In your case, it seems to me that the easiest way is to get services in such a way that they work on one type of token.

Translation is possible, but not by Istio. Look at this question. You can also read more about Istio Authentication:

Istio provides two types of authentication:

Peer authentication: used for service-to-service authentication to verify the client making the connection. Istio offers mutual TLS as a full stack solution for transport authentication, which can be enabled without requiring service code changes. This solution:

Provides each service with a strong identity representing its role to enable interoperability across clusters and clouds. - Secures service-to-service communication. - Provides a key management system to automate key and certificate generation, distribution, and rotation.

Request authentication: Used for end-user authentication to verify the credential attached to the request. Istio enables request-level authentication with JSON Web Token (JWT) validation and a streamlined developer experience using a custom authentication provider or any OpenID Connect providers, for example:

ORY Hydra

Keycloak

Auth0

Firebase Auth

Google Auth

In all cases, Istio stores the authentication policies in the Istio config store via a custom Kubernetes API. Istiod keeps them up-to-date for each proxy, along with the keys where appropriate. Additionally, Istio supports authentication in permissive mode to help you understand how a policy change can affect your security posture before it is enforced.

Source https://stackoverflow.com/questions/71124983

QUESTION

Unable to log egress traffic HTTP requests with the istio-proxy

Asked 2022-Feb-11 at 10:45

I am following this guide.

Ingress requests are getting logged. Egress traffic control is working as expected, except I am unable to log egress HTTP requests. What is missing?

...

ANSWER

Answered 2022-Feb-07 at 17:14

AFAIK istio collects only ingress HTTP logs by default.

In the istio documentation there is an old article (from 2018) describing how to enable egress traffic HTTP logs.

Please keep in mind that some of the information may be outdated, however I believe this is the part that you are missing.

Source https://stackoverflow.com/questions/71018977

QUESTION

How to provide access to a pod so that it can list and get other pods and other resource in the namespaces/cluster

Asked 2022-Feb-02 at 09:48

I have been working on creating a application which can perform verification test on the deployed istio components in the kube-cluster. The constraint in my case is that I have run this application as a pod inside the kubernetes and I cannot provide cluster-admin role to the pod of the application so that it can do all the operations. I have to create a restricted ClusterRole just to provide enough access so that application list and get all the required deployed istio resources (Reason for creating a cluster role is because when istio is deployed it created both namespace level and cluster level resources). Currently my application won't run at all if I use my restricted ClusterRole and outputs and error

...

ANSWER

Answered 2022-Feb-01 at 07:46

As OP mentioned in the comment problem is resolved after my suggestion:

Please run the command kubectl auth can-i list pods --namespace istio-system --as system:serviceaccount:istio-system:istio-deployment-verification-sa and attach result to the question. Look also here

OP has confirmed that problem is resolved:

thanx for the above command using above I was finally able to nail down the issue and found the issue to be with first resourceName and second we need to mention core api in the api group before any other. Thank you issue is resolved now.

Source https://stackoverflow.com/questions/70876554

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

Vulnerabilities

No vulnerabilities reported

Install sidecar

Due to an interest expressed in using the code on a CentOS 8 system, I managed to install and build the system after some effort and a lot of Googling. The dependencies are the same as above (more or less) but I had to locate the ACE RPMs that were not available on EPEL or PowerTools repositories. I also needed to disable the firewall to see multicast DNS traffic (configuring would be a better option, but this was on a virtual machine with no external network connectivity). Finally, I had to install Python (3.8) and used sudo alternatives --config python to make a python command available. After all of that, the build and unit tests started to work.
For the CentOS 8 build above, I now have a Dockerfile in the containers directory that can be used to build the source in controlled environnment. It is noticably slower to build this way but it does reduce the amount of work necessary to create a Linux environment for building. The containers/build script will create a new "sidecar" Docker container, provisioned with the right tools to do a build. When complete, the containers/start script can be used to start up the container and obtain a shell connection to it. Once connected, the shell has its own build script which compiles the sources from the host to generate binaries in the container. In the container, the sources are in /home/sidecar/src and the binaries will be in /home/sidecar/build/bin. NOTE: currently, there is no OpenGL support from the container via X11, so only the AScope display application will run properly.
Here are some brief notes on getting everything to run on macOS. This works on my MacBook Pro 2017 running Catalina (10.15.4). Install the Brew package manager if you don't already have it. Next, install the following packages (I've noted the versions that I currently have).
The SideCar applications rely on IPv4 multicast for transmitting data between them (using Zeroconf/Bonjour to determine who is around to listen to). For best results, you should probably route multicast traffic over your loopback interface. The apps are hardcoded (I think) to use the address 237.1.2.100 for multicast traffic. NOTE: this should not be done if you want to share multicast data with other systems on your network. It is great for development on one system so you don't disrupt the network with tons of packets.

Support

Many but not all of the source headers have JavaDoc-style comments. Using doxygen, one can convert them into a static web site:. The HTML output will reside under the docs/. It is available online at https://bradhowes.github.io/sidecar/index.html.

Find more information at: