1. What Is EnvoyFilter EnvoyFilter is a CRD resource in Istio that allows users to modify Envoy’s configuration to satisfy their customization needs for different scenarios. 1 2 3 4 5 6 7 8 9 kubectl get envoyfilter -A NAMESPACE NAME AGE istio-system add-request-id-into-ingressgateway 54d istio-system compression-gzip 18d istio-system custom-access-log 3d istio-system ingressgateway-settings 52d istio-system preserve-request-header-us-test-ingress-gateway 95d istio-system preserve-x-request-id 54d When using Istio, you will usually end up using at least a few EnvoyFilters.

1. Adding via kubectl create 1 kubectl create secret docker-registry mypullsecret --docker-server=harbor.chenshaowen.com --docker-username=robot-test --docker-password=xxxxxx With kubectl create you can add credentials for pulling images directly. 2. Adding via ~/.docker/config.json Log in to the image registry with an account and password 1 docker login harbor.chenshaowen.com:5000 1 docker login harbor.chenshaowen.com You can add more than one.

1. Steps to Add a Key 1.1 Generate an SSH Key on the Client There are two key formats: Old format, the private key begins with -----BEGIN RSA PRIVATE KEY----- 1 ssh-keygen -m PEM -t rsa -b 4096 -C "mail@chenshaowen.com" New format, the private key begins with -----BEGIN OPENSSH PRIVATE KEY----- 1 ssh-keygen -t rsa -b 4096 -C "mail@chenshaowen.

1. Several Ways for a Kubernetes Pod to Reference Environment Variables 1.1 Directly Key/Value You can set the Value directly, and you can also use the current Pod’s information as the Value. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 apiVersion: v1 kind: Pod metadata: name: envar-demo labels: purpose: demonstrate-envars spec: containers: - name: envar-demo-container image: gcr.

1. How Logstash Works Logstash is a component for data transport and processing. Through combinations of plugins, Logstash can handle a wide variety of log collection scenarios: logstash->elasticsearch filebeat->logstash->elasticsearch filebeat->kafka->logstash->elasticsearch filebeat->redis->logstash->elasticsearch 2. Basic Logstash Configuration Here is the format of a Logstash configuration: 1 2 3 4 5 6 7