Install cluster

Opensearch

Getting started

We are providing a customized helm script, in the directory helm-deployment, to allow easier deployment of OpenSearch in Kubernetes.

First, create the namespace for the deployment, in this example ctk-opensearch is going to be used.

1. Deploying OpenSearch cluster

1. Make sure the namespace is already created or create it with kubectl create namespace ctk-opensearch

2. Customize the domains from ingress.host within the script opensearch.sh (and make sure the DNS setup of those domains is pointing to the load balancer of the Kubernetes cluster)

3. Add OpenSearch helm repository helm repo add opensearch https://opensearch-project.github.io/helm-charts/

4. Enable plugins.security.ssl.http and uncomment the lines with the certificates in the section opensearch.yml from the file opensearch-values.yaml (ssl needs to be enabled in order to run the security script later on) Important values like persistence.size (the size of storage volumes) should also be customized from the file opensearch-values.yaml

5. Run the script opensearch.sh

This should create pods opensearch-cluster-master-x. Testing the pods from within the same pods is easy with curl and the default credentials (admin admin):

curl -XGET http://localhost:9200 -u 'admin:admin'

Testing from anywhere in the internet should be also possible using the customized domain (possible with CURL or directly via the browser).

curl -XGET https://search.eduplex.eu -u 'admin:admin'

2. Customize default admin password in static files (Optional)

The first time the cluster is deployed, the default credentials should be changed. Future re-deployments on the same Kubernetes cluster will keep the same credentials, since this data is persistent even after namespace deletion.

This step is not needed if you want to proceed with the password already stored in the file .env.opensearch-edupl.env.

The hash in the file helm-deployment/configMaps/internal_users.yml (configured as extraVolumeMounts in the file opensearch-values.yaml) should be edited to change default passwords according to the docs.

The password stored in this file should be hashed. A hash tool is located in the container image.

To run this tool, log-in into one of the pods from opensearch-cluster and run the script /usr/share/opensearch/plugins/opensearch-security/tools/hash.sh -p aXr1x3k3VCqI5bu

Copy the hashed password from the output of the tool and update the hash internal_users.yml with this hash.

The file opensearch-dashboards-edu-secret.yaml should also be updated including the new password, otherwise the connection between opensearch-dashboards (a.k.a Kibana) and the search endpoint will not work.

1. Change the password from file .env.opensearch-edupl.env

2. Run the command to generate the secret and seal it with kubeseal. The command to generate the sealed secrets is available in the script file opensearch.sh, this command is starting with #++ (because it does need to be executed only if the credentials need to be changed or a new Kubernetes cluster is used, an encrypted version of the secret file is stored in this repository)

Totally delete all deployments (the easiest way to do this is by removing the namespace and creating it again).

kubectl delete namespace ctk-opensearch
kubectl create namespace ctk-opensearch

Run opensearch.sh script again to deploy OpenSearch.

3. Deploying OpenSearch cluster with new password

Wait a few minutes until OpenSearch is deployed

Log-in into the pod.

Optionally, check if the internal_users file was properly updated and using the correct hash.

head -n40 /usr/share/opensearch/config/opensearch-security/internal_users.yml

Then run the following script in order to update the passwords properly making them persistent (if this script is not executed, the password will not be updated):

/usr/share/opensearch/plugins/opensearch-security/tools/securityadmin.sh -cacert /usr/share/opensearch/config/root-ca.pem -cert /usr/share/opensearch/config/kirk.pem -key /usr/share/opensearch/config/kirk-key.pem -cd /usr/share/opensearch/config/opensearch-security/

Once finished successfully, the connection can be tested using insecure https connection:

curl -XGET --insecure https://localhost:9200 -u 'admin:aXr1x3k3VCqI5bu'
curl -XGET --insecure https://localhost:9200 -u 'admin:teoperro2023!'
curl -XGET --insecure https://localhost:9200 -u 'admin:admin'
curl -XGET http://localhost:9200 -u 'admin:aXr1x3k3VCqI5bu'
curl -XGET http://localhost:9200 -u 'admin:teoperro2023!'
curl -XGET http://localhost:9200 -u 'admin:admin'

The ssl certificate in production, will be handled by nginx-ingress controller and generated automatically using LetsEncrypt, for this reason, https inside the private network is not needed.

Revert the changes in plugins.security.ssl.http in order to disable ssl certificate and re-deploy OpenSearch again using the script.

After a few minutes, when the deployment is finished, testing the access via the browser or Curl using the newly changed admin account and password should be working.

The connection with OpenSearch dashboards should be working properly on the configured domain.

Create new users

Following the docs, open OpenSearch Dashboards domain and go to Security > Internal Users and Create internal user. Remember to select correct roles (for example a role to read only from index and another role to update documents to the index).

To create role with index permisions in a certain index go to

Management->Security->Roles->Create role

Specify Index and index permissions

Create new user under Management->Security->Roles->Internal users and assign the created role