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Exposing Services
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Exposing Services
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1. via Ingress
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Use Calico instead of Flannel
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1. via Ingress
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< h1 id = "exposing-services" > Exposing Services< a class = "headerlink" href = "#exposing-services" title = "Permanent link" > ¶ < / a > < / h1 >
< h2 id = "1-via-ingress" > 1. via Ingress< a class = "headerlink" href = "#1-via-ingress" title = "Permanent link" > ¶ < / a > < / h2 >
< p > In this example, we will deploy a simple nginx webserver deployment and make it accessible via ingress.
Therefore, we have to create the cluster in a way, that the internal port 80 (where the < code > traefik< / code > ingress controller is listening on) is exposed on the host system.< / p >
< ol >
< li >
< p > Create a cluster, mapping the ingress port 80 to localhost:8081< / p >
< p > < code class = "highlight" > k3d cluster create --api-port < span class = "m" > 6550< / span > -p < span class = "s2" > " 8081:80@loadbalancer" < / span > --agents < span class = "m" > 2< / span > < / code > < / p >
< div class = "admonition info" >
< p class = "admonition-title" > Good to know< / p >
< ul >
< li > < code > --api-port 6550< / code > is not required for the example to work. It’ s used to have < code > k3s< / code > ‘ s API-Server listening on port 6550 with that port mapped to the host system.< / li >
< li > the port-mapping construct < code > 8081:80@loadbalancer< / code > means< ul >
< li > map port < code > 8081< / code > from the host to port < code > 80< / code > on the container which matches the nodefilter < code > loadbalancer< / code > < / li >
< / ul >
< / li >
< li > the < code > loadbalancer< / code > nodefilter matches only the < code > serverlb< / code > that’ s deployed in front of a cluster’ s server nodes< ul >
< li > all ports exposed on the < code > serverlb< / code > will be proxied to the same ports on all server nodes in the cluster< / li >
< / ul >
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< p > Get the kubeconfig file< / p >
< p > < code class = "highlight" > < span class = "nb" > export< / span > < span class = "nv" > KUBECONFIG< / span > < span class = "o" > =< / span > < span class = "s2" > " < / span > < span class = "k" > $(< / span > k3d kubeconfig write k3s-default< span class = "k" > )< / span > < span class = "s2" > " < / span > < / code > < / p >
< / li >
< li >
< p > Create a nginx deployment< / p >
< p > < code class = "highlight" > kubectl create deployment nginx --image< span class = "o" > =< / span > nginx< / code > < / p >
< / li >
< li >
< p > Create a ClusterIP service for it< / p >
< p > < code class = "highlight" > kubectl create service clusterip nginx --tcp< span class = "o" > =< / span > < span class = "m" > 80< / span > :80< / code > < / p >
< / li >
< li >
< p > Create an ingress object for it with < code class = "highlight" > kubectl apply -f< / code >
< em > Note< / em > : < code > k3s< / code > deploys < a href = "https://github.com/containous/traefik" > < code > traefik< / code > < / a > as the default ingress controller< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "c1" > # apiVersion: networking.k8s.io/v1beta1 # for k3s < v1.19< / span >
< span class = "nt" > apiVersion< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > networking.k8s.io/v1< / span >
< span class = "nt" > kind< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > Ingress< / span >
< span class = "nt" > metadata< / span > < span class = "p" > :< / span >
< span class = "nt" > name< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > nginx< / span >
< span class = "nt" > annotations< / span > < span class = "p" > :< / span >
< span class = "nt" > ingress.kubernetes.io/ssl-redirect< / span > < span class = "p" > :< / span > < span class = "s" > " false" < / span >
< span class = "nt" > spec< / span > < span class = "p" > :< / span >
< span class = "nt" > rules< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "nt" > http< / span > < span class = "p" > :< / span >
< span class = "nt" > paths< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "nt" > path< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > /< / span >
< span class = "nt" > pathType< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > Prefix< / span >
< span class = "nt" > backend< / span > < span class = "p" > :< / span >
< span class = "nt" > service< / span > < span class = "p" > :< / span >
< span class = "nt" > name< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > nginx< / span >
< span class = "nt" > port< / span > < span class = "p" > :< / span >
< span class = "nt" > number< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > 80< / span >
< / code > < / pre > < / div >
< / li >
< li >
< p > Curl it via localhost< / p >
< p > < code class = "highlight" > curl localhost:8081/< / code > < / p >
< / li >
< / ol >
< h2 id = "2-via-nodeport" > 2. via NodePort< a class = "headerlink" href = "#2-via-nodeport" title = "Permanent link" > ¶ < / a > < / h2 >
< ol >
< li >
< p > Create a cluster, mapping the port 30080 from agent-0 to localhost:8082< / p >
< p > < code class = "highlight" > k3d cluster create mycluster -p < span class = "s2" > " 8082:30080@agent[0]" < / span > --agents < span class = "m" > 2< / span > < / code > < / p >
< ul >
< li >
< p > < strong > Note< / strong > : Kubernetes’ default NodePort range is < a href = "https://kubernetes.io/docs/concepts/services-networking/service/#nodeport" > < code > 30000-32767< / code > < / a > < / p >
< / li >
< li >
< p > < strong > Note< / strong > : You may as well expose the whole NodePort range from the very beginning, e.g. via < code > k3d cluster create mycluster --agents 3 -p "30000-32767:30000-32767@server[0]"< / code > (See < a href = "https://www.youtube.com/watch?v=5HaU6338lAk" > this video from @portainer< / a > )< / p >
< / li >
< / ul >
< / li >
< / ol >
< p > … (Steps 2 and 3 like above) … < / p >
< ol >
< li >
< p > Create a NodePort service for it with < code class = "highlight" > kubectl apply -f< / code > < / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > apiVersion< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > v1< / span >
< span class = "nt" > kind< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > Service< / span >
< span class = "nt" > metadata< / span > < span class = "p" > :< / span >
< span class = "nt" > labels< / span > < span class = "p" > :< / span >
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