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Basic usage
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< a href = "https://github.com/kubernetes/ingress-nginx/edit/master/docs/user-guide/basic-usage.md" title = "Edit this page" class = "md-icon md-content__icon" >  < / a >
< h1 id = "basic-usage-host-based-routing" > Basic usage - host based routing< a class = "headerlink" href = "#basic-usage-host-based-routing" title = "Permanent link" > ¶ < / a > < / h1 >
< p > ingress-nginx can be used for many use cases, inside various cloud provider and supports a lot of configurations. In this section you can find a common usage scenario where a single load balancer powerd by ingress-nginx will route traffic to 2 different HTTP backend services based on the host name.< / p >
< p > First of all follow the instructions to install ingress-nginx. Then imagine that you need to expose 2 HTTP services already installed: < code class = "codehilite" > myServiceA< / code > , < code class = "codehilite" > myServiceB< / code > . Let's say that you want to expose the first at < code class = "codehilite" > myServiceA.foo.org< / code > and the second at < code class = "codehilite" > myServiceB.foo.org< / code > . One possible solution is to create two < strong > ingress< / strong > resources:< / p >
< div class = "codehilite" > < pre > < span > < / span > < span class = "n" > apiVersion< / span > < span class = "o" > :< / span > < span class = "n" > extensions< / span > < span class = "o" > /< / span > < span class = "n" > v1beta1< / span >
< span class = "n" > kind< / span > < span class = "o" > :< / span > < span class = "n" > Ingress< / span >
< span class = "n" > metadata< / span > < span class = "o" > :< / span >
< span class = "n" > name< / span > < span class = "o" > :< / span > < span class = "n" > ingress< / span > < span class = "o" > -< / span > < span class = "n" > myServiceA< / span >
< span class = "n" > annotations< / span > < span class = "o" > :< / span >
< span class = "err" > #< / span > < span class = "n" > use< / span > < span class = "n" > the< / span > < span class = "n" > shared< / span > < span class = "n" > ingress< / span > < span class = "o" > -< / span > < span class = "n" > nginx< / span >
< span class = "n" > kubernetes< / span > < span class = "o" > .< / span > < span class = "na" > io< / span > < span class = "o" > /< / span > < span class = "n" > ingress< / span > < span class = "o" > .< / span > < span class = "na" > class< / span > < span class = "o" > :< / span > < span class = "s2" > " nginx" < / span >
< span class = "n" > spec< / span > < span class = "o" > :< / span >
< span class = "n" > rules< / span > < span class = "o" > :< / span >
< span class = "o" > -< / span > < span class = "n" > host< / span > < span class = "o" > :< / span > < span class = "n" > myServiceA< / span > < span class = "o" > .< / span > < span class = "na" > foo< / span > < span class = "o" > .< / span > < span class = "na" > org< / span >
< span class = "n" > http< / span > < span class = "o" > :< / span >
< span class = "n" > paths< / span > < span class = "o" > :< / span >
< span class = "o" > -< / span > < span class = "n" > path< / span > < span class = "o" > :< / span > < span class = "o" > /< / span >
< span class = "n" > backend< / span > < span class = "o" > :< / span >
< span class = "n" > serviceName< / span > < span class = "o" > :< / span > < span class = "n" > myServiceA< / span >
< span class = "n" > servicePort< / span > < span class = "o" > :< / span > < span class = "mi" > 80< / span >
< span class = "o" > ---< / span >
< span class = "n" > apiVersion< / span > < span class = "o" > :< / span > < span class = "n" > extensions< / span > < span class = "o" > /< / span > < span class = "n" > v1beta1< / span >
< span class = "n" > kind< / span > < span class = "o" > :< / span > < span class = "n" > Ingress< / span >
< span class = "n" > metadata< / span > < span class = "o" > :< / span >
< span class = "n" > name< / span > < span class = "o" > :< / span > < span class = "n" > ingress< / span > < span class = "o" > -< / span > < span class = "n" > myServiceB< / span >
< span class = "n" > annotations< / span > < span class = "o" > :< / span >
< span class = "err" > #< / span > < span class = "n" > use< / span > < span class = "n" > the< / span > < span class = "n" > shared< / span > < span class = "n" > ingress< / span > < span class = "o" > -< / span > < span class = "n" > nginx< / span >
< span class = "n" > kubernetes< / span > < span class = "o" > .< / span > < span class = "na" > io< / span > < span class = "o" > /< / span > < span class = "n" > ingress< / span > < span class = "o" > .< / span > < span class = "na" > class< / span > < span class = "o" > :< / span > < span class = "s2" > " nginx" < / span >
< span class = "n" > spec< / span > < span class = "o" > :< / span >
< span class = "n" > rules< / span > < span class = "o" > :< / span >
< span class = "o" > -< / span > < span class = "n" > host< / span > < span class = "o" > :< / span > < span class = "n" > myServiceB< / span > < span class = "o" > .< / span > < span class = "na" > foo< / span > < span class = "o" > .< / span > < span class = "na" > org< / span >
< span class = "n" > http< / span > < span class = "o" > :< / span >
< span class = "n" > paths< / span > < span class = "o" > :< / span >
< span class = "o" > -< / span > < span class = "n" > path< / span > < span class = "o" > :< / span > < span class = "o" > /< / span >
< span class = "n" > backend< / span > < span class = "o" > :< / span >
< span class = "n" > serviceName< / span > < span class = "o" > :< / span > < span class = "n" > myServiceB< / span >
< span class = "n" > servicePort< / span > < span class = "o" > :< / span > < span class = "mi" > 80< / span >
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< p > When you apply this yaml, 2 ingress resources will be created managed by the < strong > ingress-nginx< / strong > instance. Nginx is configured to automatically discover all ingress with the < code class = "codehilite" > kubernetes.io/ingress.class: " nginx" < / code > annotation.
Please note that the ingress resource should be placed inside the same namespace of the backend resource.< / p >
< p > On many cloud providers ingress-nginx will also create the corresponding Load Balancer resource. All you have to do is get the external IP and add a DNS < code class = "codehilite" > A record< / code > inside your DNS provider that point myServiceA.foo.org and myServiceB.foo.org to the nginx external IP. Get the external IP by running:< / p >
< div class = "codehilite" > < pre > < span > < / span > kubectl get services -n ingress-nginx
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