Kubernetes: NGINX/PHP-FPM graceful shutdown and 502 errors

We have a PHP application running with Kubernetes in pods with two dedicated containers — NGINX и PHP-FPM.

The problem is that during downscaling clients get 502 errors. E.g. when a pod is stopping, its containers can not correctly close existing connections.

So, in this post, we will take a closer look at the pods’ termination process in general, and NGINX and PHP-FPM containers in particular.

Testing will be performed on the AWS Elastic Kubernetes Service by the  Yandex.Tank utility.

Ingress resource will create an AWS Application Load Balancer with the  AWS ALB Ingress Controller.

Pod Lifecycle — Termination of Pods

So, let’s take an overview of the pods’ stopping and termination process.

Basically, a pod is a set of processes running on a Kubernetes WorkerNode, which are stopped by standard IPC (Inter-Process Communication) signals.

To give the pod the ability to finish all its operations, a  container runtime at first ties softly stop it (graceful shutdown) by sending a SIGTERM signal to a PID 1 in each container of this pod (see  docker stop). Also, a cluster starts counting a grace period before force kill this pod by sending a SIGKILL signal.

The SIGTERM can be overridden by using the STOPSIGNAL in an image used to spin up a container.

#php-fpm #nginx #kubernetes #troubleshooting #docker

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Buddha Community

50+ Useful Kubernetes Tools for 2020 - Part 2

Introduction

Last year, we provided a list of Kubernetes tools that proved so popular we have decided to curate another list of some useful additions for working with the platform—among which are many tools that we personally use here at Caylent. Check out the original tools list here in case you missed it.

According to a recent survey done by Stackrox, the dominance Kubernetes enjoys in the market continues to be reinforced, with 86% of respondents using it for container orchestration.

(State of Kubernetes and Container Security, 2020)

And as you can see below, more and more companies are jumping into containerization for their apps. If you’re among them, here are some tools to aid you going forward as Kubernetes continues its rapid growth.

(State of Kubernetes and Container Security, 2020)

#blog #tools #amazon elastic kubernetes service #application security #aws kms #botkube #caylent #cli #container monitoring #container orchestration tools #container security #containers #continuous delivery #continuous deployment #continuous integration #contour #developers #development #developments #draft #eksctl #firewall #gcp #github #harbor #helm #helm charts #helm-2to3 #helm-aws-secret-plugin #helm-docs #helm-operator-get-started #helm-secrets #iam #json #k-rail #k3s #k3sup #k8s #keel.sh #keycloak #kiali #kiam #klum #knative #krew #ksniff #kube #kube-prod-runtime #kube-ps1 #kube-scan #kube-state-metrics #kube2iam #kubeapps #kubebuilder #kubeconfig #kubectl #kubectl-aws-secrets #kubefwd #kubernetes #kubernetes command line tool #kubernetes configuration #kubernetes deployment #kubernetes in development #kubernetes in production #kubernetes ingress #kubernetes interfaces #kubernetes monitoring #kubernetes networking #kubernetes observability #kubernetes plugins #kubernetes secrets #kubernetes security #kubernetes security best practices #kubernetes security vendors #kubernetes service discovery #kubernetic #kubesec #kubeterminal #kubeval #kudo #kuma #microsoft azure key vault #mozilla sops #octant #octarine #open source #palo alto kubernetes security #permission-manager #pgp #rafay #rakess #rancher #rook #secrets operations #serverless function #service mesh #shell-operator #snyk #snyk container #sonobuoy #strongdm #tcpdump #tenkai #testing #tigera #tilt #vert.x #wireshark #yaml

Kubernetes: NGINX/PHP-FPM graceful shutdown and 502 errors

We have a PHP application running with Kubernetes in pods with two dedicated containers — NGINX и PHP-FPM.

The problem is that during downscaling clients get 502 errors. E.g. when a pod is stopping, its containers can not correctly close existing connections.

So, in this post, we will take a closer look at the pods’ termination process in general, and NGINX and PHP-FPM containers in particular.

Testing will be performed on the AWS Elastic Kubernetes Service by the  Yandex.Tank utility.

Ingress resource will create an AWS Application Load Balancer with the  AWS ALB Ingress Controller.

Pod Lifecycle — Termination of Pods

So, let’s take an overview of the pods’ stopping and termination process.

Basically, a pod is a set of processes running on a Kubernetes WorkerNode, which are stopped by standard IPC (Inter-Process Communication) signals.

To give the pod the ability to finish all its operations, a  container runtime at first ties softly stop it (graceful shutdown) by sending a SIGTERM signal to a PID 1 in each container of this pod (see  docker stop). Also, a cluster starts counting a grace period before force kill this pod by sending a SIGKILL signal.

The SIGTERM can be overridden by using the STOPSIGNAL in an image used to spin up a container.

#php-fpm #nginx #kubernetes #troubleshooting #docker

How to enable or disable error reporting in php

How do I get PHP errors to display. In this tutorial, you will learn how to display all errors in PHP.

And as well as learn, how to reporting all errors in PHP.

First of all, you need to know that in PHP, Some error prevents the execution of the script. And some errors only display error messages with warning. Then you will learn how to show or hide all errors reporting in PHP.

How do I get PHP errors to display. In this tutorial, you will learn how to display all errors in PHP.

And as well as learn, how to reporting all errors in PHP.

First of all, you need to know that in PHP, Some error prevents the execution of the script. And some errors only display error messages with warning. Then you will learn how to show or hide all errors reporting in PHP.

https://www.tutsmake.com/php-display-all-errors-example/

#enable error reporting in php #php error reporting off #php.ini error reporting off #php.ini display_errors #disable warning in php ini

PHP Error 404 on IIS Server - How Did I Solve The Error.

I was working on IIS server and trying to run php but got 404 errors on all pages. Although static files were working fine but php were not.

In this article I will discuss all the possible ways you can try and check in order to run your php scripts.

1. Check if php file exists in your directory

Well, its a rookie mistake. Sometimes we falsely use wrong path and stay confused for hours. That’s why it is recommended to double check the file location. Generally, in case of IIS, you put your server files in –

C:\inetpub\wwwroot

#php #error #iis server #php error #php short

Hire PHP Developer

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