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My question is what are these Ingress and flannel?
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Machine not on GCP), it just does not work as what I tried on minikubeĭid you open the security rules/firewall rules for the NodePort? On which instance did you open and which instance are you hitting to access your app? I want to add few more points along with exiting answers.Īfter that I simply access the webapps from my browser (on my local The Ingress is a Kubernetes object which is usually operate at the application layer of the network stack (HTTP) and allow you to expose your Service externally, it also provides a features such as HTTP requests routing, cookie-based session affinity, HTTPS traffic termination and so on. supporting features like NetworkPolicy for restricting resources ) They vary according to functionality ( e.g. The Kubernetes supports some other CNI plugins: Calico, weave, etc. More specifically, flannel gives each host an IP subnet (/24īy default) from which the Docker daemon is able to allocate IPs to It uses packetĮncapsulation to create a virtual overlay network that spans the wholeĬluster. Used for container-to-container communication. This makes it difficult for applications running inside containers toĪdvertise their external IP and port as that information is notįlannel solves the problem by giving each container an IP that can be
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Machines and must rely on port-mapping to reach the desired container. Over a network, containers are tied to the IP addresses of the host As coreOS says:Įach container is assigned an IP address that can be used toĬommunicate with other containers on the same host. The flannel and the Ingress are completely different things.įlannel is a CNI or Container Network Interface plugin which task is networking between containers. Where are these ingress and flannel suits to ? If its not about them both, why my apps does not work as intended (i open all port in GCP setting so its not security issue I suppose), I tried setting up Kubernetes Dashboard-UI, run kubectl proxy and still my browser cannot access both services (my webapp inside the deployment and also Dashboard API), may be I am a little bit lost here. My question is what are these Ingress and flannel ? Which one is necessary or both are not necessary at all if I just want my webapp run ? How does each other works against others ? Because from my understanding the layering is as per below : I dig some search and there are a lot of people saying regarding Ingress and network layer (flannel in kubernetes website example) When I was trying to kubectl apply -f (a deployment which contains a pod with simple webapps inside) and kubectl apply -f (a NodePort type of Service which target the deployment port)Īfter that I simply access the webapps from my browser (on my local machine not on GCP), it just does not work as what I tried on minikube (I setup minikube with same kubectl apply as above too). So I ran kubeadm on kubemaster and kubenode1 which : Note 2: You may as well expose the whole NodePort range from the very beginning, e.g.I am setting up 2 VPC on GCP, I setup kubeadm on each, let's call them kubemaster and kubenode1.
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K3d cluster create mycluster -p "8082: :0" -agents 2 # apiVersion: /v1beta1 # for k3s < v1.19 apiVersion : /v1 kind : Ingress metadata : name : nginx annotations : /ssl-redirect : "false" spec : rules : - http : paths : - path : / pathType : Prefix backend : service : name : nginx port : number : 80Ĭreate a cluster, mapping the port 30080 from agent-0 to localhost:8082 Note: k3s deploys traefik as the default ingress controller Kubectl create service clusterip nginx -tcp = 80:80Ĭreate an ingress object for it by copying the following manifest to a file and applying with kubectl apply -f thatfile.yaml Kubectl create deployment nginx -image =nginx Get the kubeconfig file (redundant, as k3d cluster create already merges it into your default kubeconfig file)Įxport KUBECONFIG = " $(k3d kubeconfig write k3s-default ) " all ports exposed on the serverlb will be proxied to the same ports on all server nodes in the cluster.the loadbalancer nodefilter matches only the serverlb that’s deployed in front of a cluster’s server nodes.“map port 8081 from the host to port 80 on the container which matches the nodefilter loadbalancer“ the port-mapping construct 8081: means:.It’s used to have k3s‘s API-Server listening on port 6550 with that port mapped to the host system. -api-port 6550 is not required for the example to work.