Have you ever deployed ELK/OpenSearch from scratch?

Yes, I have had to deploy ELK (Elasticsearch, Logstash, Kibana) and OpenSearch from scratch. The process usually includes:

• Installing and configuring Elasticsearch/OpenSearch clusters considering fault tolerance and scalability requirements.
• Configuring Logstash or other agents for log collection and parsing.
• Setting up Kibana or OpenSearch Dashboards for data visualization.
• Optimizing indexes and templates for efficient storage and search.
• Ensuring security: setting up authentication, encryption, and access rights.

For example, for ELK, Docker Compose or Ansible can be used for deployment automation, and for OpenSearch, Helm charts in Kubernetes. It's also important to monitor the cluster's health and configure backups.