Install and use litmus for chaos testing
- Sai Akhil Gudimetla
Litmus is an open source Chaos Engineering platform that enables teams to identify weaknesses & potential outages in infrastructures by inducing chaos tests in a controlled way.
Chaos Experiment: Chaos Experiments are fundamental units within the LitmusChaos architecture. Users can choose between readily available chaos experiments or create new ones to construct a required Chaos Workflow.
Chaos Workflow: A chaos workflow is much more than a simple chaos experiment. It supports the user in defining the expected result, observing the result, analysing the overall system behaviour, and in the decision-making process if the system needs to be tuned for improving the resilience.
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 listStep-2: Create the namespace on which you want to install Litmus ChaosCenter
kubectl create ns litmusStep-3: Install Litmus ChaosCenter
helm install chaos litmuschaos/litmus --namespace=litmusExpected Output
NAME: chaos
LAST DEPLOYED: Wed Dec 15 20:18:37 2021
NAMESPACE: litmus
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
Thank you for installing litmus 😀
Your release is named chaos and it's installed to namespace: litmus.
Visit https://docs.litmuschaos.io to find more info.Create Workflow and experiments
Step-1: Login to litmus frontend, Initially password needs to be changed
Step-2: Create a workflow and select agent.
Note: Agents are kubenetes cluster(we can add other k8s clusters), in above case we are using k8s cluster where litmus is installed(self-agent).
Step-3: We can use predefined experiments which are in chaoshub.
Step-4: Name the workflow and give description.
Step-5: Now add experiments under workflow, multiple experiments can be added.
For example, lets take pod-delete and pod-network-loss experiments.
Target the application based on labels
Update chaos duration settings according to requirment
Disable Revert schedule option to view chaos logs after experiment:
Step-6: Choose experiment weight, it will be from 0 to 10 scale.
Step-7: Schedule the workflow according to the requirement.
Step-8: Review the changes and trigger the experiment.
we can export workflow in yaml format.
Observations:
Based on experiments please observe the application stability and logs.
After executing experiments:
