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chaoscenter-cluster-scope-installation ChaosCenter Cluster Scope Installation Cluster Scope

Prerequisites

Before deploying LitmusChaos, make sure the following items are there

  • Kubernetes 1.17 or later

  • A Persistent volume of 20GB

    :::note Recommend to have a Persistent volume(PV) of 20GB, You can start with 1GB for test purposes as well. This PV is used as persistent storage to store the chaos config and chaos-metrics in the Portal. By default, litmus install would use the default storage class to allocate the PV. Provide this value :::

  • Helm3 or kubectl

Installation

Installation of Litmus can be done using either of the below methods

Install Litmus using Helm

The helm chart will install all the required service account configuration and ChaosCenter.

The following steps will help you install Litmus ChaosCenter via helm.

Step-1: Add the litmus helm repository

helm repo add litmuschaos https://litmuschaos.github.io/litmus-helm/
helm repo list

Step-2: Create the namespace on which you want to install Litmus ChaosCenter

  • The chaoscenter components can be placed in any namespace, though it is typically placed in "litmus".
kubectl create ns litmus

Step-3: Install Litmus ChaosCenter

helm install chaos litmuschaos/litmus --namespace=litmus

<span style={{color: 'green'}}>Expected Output

NAME: chaos
LAST DEPLOYED: Tue Jun 15 19:20:09 2021
NAMESPACE: litmus
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
Thank you for installing litmus 😀

Your release is named chaos and its installed to namespace: litmus.

Visit https://docs.litmuschaos.io to find more info.

Note: Litmus uses Kubernetes CRDs to define chaos intent. Helm3 handles CRDs better than Helm2. Before you start running a chaos experiment, verify if Litmus is installed correctly.

**Install Litmus using kubectl **

Install Litmus ChaosCenter

Applying the manifest file will install all the required service account configuration and ChaosCenter.

kubectl apply -f https://litmuschaos.github.io/litmus/3.0.0-beta8/litmus-3.0.0-beta8.yaml

If you are installing Litmus in any other namespace apart from litmus namespace, make sure to change the same in the manifest too https://litmuschaos.github.io/litmus/3.0.0-beta8/litmus-3.0.0-beta8.yaml.

Verify your installation

Verify if the frontend, server, and database pods are running

  • Check the pods in the namespace where you installed Litmus:

    kubectl get pods -n litmus

    <span style={{color: 'green'}}>Expected Output

    NAME                                       READY   STATUS              RESTARTS   AGE
litmusportal-server-6fd57cc89-6w5pn        1/1     Running              0          57s
litmusportal-auth-server-7b596fff9-5s6g5   1/1     Running              0          57s
mongo-0                                    1/1     Running              0          57s
litmusportal-frontend-55974fcf59-cxxrf     1/1     Running              0          58s

  • Check the services running in the namespace where you installed Litmus:

    kubectl get svc -n litmus

    <span style={{color: 'green'}}>Expected Output

    NAME                            TYPE        CLUSTER-IP      EXTERNAL-IP PORT(S)                       AGE
litmusportal-frontend-service      NodePort    10.43.79.17    <none>        9091:31846/TCP                  102s
litmusportal-server-service        NodePort    10.43.30.54    <none>        9002:31245/TCP,8000:32714/TCP   101s
litmusportal-auth-server-service   NodePort    10.43.81.108   <none>        9003:32618/TCP,3030:31899/TCP   101s
mongo-service                      ClusterIP   10.43.227.10   <none>        27017/TCP                       101s
mongo-headless-service             ClusterIP   None           <none>        27017/TCP                       101s

Verify Successful Registration of the Self Chaos Delegate post Account Configuration

Once the project is created, the cluster is automatically registered as a chaos target via installation of Chaos Delegate. This is represented as Self Chaos Delegate in ChaosCenter.

kubectl get pods -n litmus

NAME                                     READY   STATUS    RESTARTS   AGE
chaos-exporter-547b59d887-4dm58          1/1     Running   0          5m27s
chaos-operator-ce-84ddc8f5d7-l8c6d       1/1     Running   0          5m27s
event-tracker-5bc478cbd7-xlflb           1/1     Running   0          5m28s
litmusportal-frontend-97c8bf86b-mx89w    1/1     Running   0          15m
litmusportal-server-6fd57cc89-6w5pn      1/1     Running   0          15m
litmusportal-auth-server-7b596fff9-5s6g5 1/1     Running   0          15m
mongo-0                                  1/1     Running   0          15m
subscriber-958948965-qbx29               1/1     Running   0          5m30s
workflow-controller-78fc7b6c6-w82m7      1/1     Running   0          5m32s

Resource Requirements of Control-plane components

The Resource requests provided here have been estimated using data gathered manually through different methods -

  • Using command kubectl top
  • Recommendations from Vertical-Pod-Autoscaler
  • Recommendations by a great utility Goldilocks.

These resources are getting monitored continuously and the information below will be updated as the metrics changes.

:::note The metrics given below shows resources consumed when ChaosCenter is used at medium scale.The resources may need to be increased when used at higher scale. :::

Pod Container CPU Memory
litmusportal-frontend litmusportal-frontend 25m 300M
litmusportal-server auth-server 25m 150M
litmusportal-server graphql-server 25m 350M
mongodb mongodb 25m 350M

Resources

Learn more