Secure baseline for new instances
Automatically secure new instances
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Create a cloud-init or user-data script to automatically apply a secure baseline configuration to all new [EC2/VM_GCP] instances. The script must: configure SSH (key-only authentication, custom port, fail2ban), install monitoring and security agents, configure the firewall, and register the instance in [Ansible/Chef/Puppet].
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Pensez à combiner `write_files` et `runcmd` pour éviter les dépendances de paquets, et validez le script avec `cloud-init devel schema` avant déploiement. Sur AWS, préférez les clés via IAM (SSM) plutôt qu'un port custom si vous utilisez un bastion. Ajoutez une tache périodique (`cloud-config` `cron`) pour vérifier l'intégrité des agents.
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