Running Istio Service Mesh on OpenShift

Istio.io is an open platform that provides a uniform way to connect, manage, and secure microservices. This article describes installing and running on OpenShift (>=1.5 as of now) only. If you would like to know more theory I encourage you to read this post by @christianposta

Note that some of the permissions mentioned in this article may be more than what is needed. I plan to do further research and publish another article or comments on this post with accurate permissions in the future. For updates follow me on twitter @debianmaster

Run as Cluster Administrator on Master

oc login -u system:admin

Istio installation requires that you are the cluster-admin; you can use any cluster admin user for this purpose.

Choose a Namespace and Provide Permissions

oc project default
oc adm policy add-scc-to-user anyuid -z default
oc adm policy add-scc-to-user privileged -z default
oc patch scc/privileged --patch {"allowedCapabilities":["NET_ADMIN"]}

NET_ADMIN privilege is needed for iptable NAT redirect chains updated by Istio.

Install Istio Service Mesh

git clone https://github.com/istio/istio
git checkout 0.1.5

Apply Necessary Permissions

oc adm policy add-cluster-role-to-user cluster-admin -z istio-manager-service-account
oc adm policy add-cluster-role-to-user cluster-admin -z istio-ingress-service-account
oc adm policy add-cluster-role-to-user cluster-admin -z default

oc adm policy add-scc-to-user anyuid -z istio-ingress-service-account
oc adm policy add-scc-to-user privileged -z istio-ingress-service-account

oc adm policy add-scc-to-user anyuid -z istio-manager-service-account
oc adm policy add-scc-to-user privileged -z istio-manager-service-account

Many permissions are needed currently, but this may change.  Istio installation creates custom service accounts and they need privileges to be able to create ThirdPartyResources.

Deploying Istio

oc apply -f istio/install/kubernetes/istio.yaml

Install Addons

oc apply -f istio/install/kubernetes/addons/prometheus.yaml
oc apply -f istio/install/kubernetes/addons/grafana.yaml
oc apply -f istio/install/kubernetes/addons/servicegraph.yaml

Deploy Sample App

Install istioctl first

curl -L https://git.io/getIstio | sh -
export PATH="$PATH:/Users/YOUR_USERNAME/istio/istio-0.1.5/bin"

Note: Don’t forget to replace with the appropriate value.

Deploy bookInfo App

oc apply -f 

Test Service Mesh / Using Grafana Pod (or Another Pod)

$ export GRAFANA=$(oc get pods -l app=grafana -o jsonpath={.items[0].metadata.name})
$ oc exec $GRAFANA -- curl -o /dev/null -s -w "%{http_code}n" http://istio-ingress/productpage
$ open http://$(oc get routes servicegraph -o jsonpath={.spec.host})/dotviz

Conclusion

You should see something like this at the end showing tje service graph.

See it in action

https://www.youtube.com/watch?v=RzOdpk-QFCk

Categories
OpenShift Container Platform, OpenShift Dedicated, OpenShift Online, OpenShift Origin
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