9 Zero-downtime deployments

This chapter covers

  • Customizing resource lifecycles with the create_before_destroy flag
  • Performing Blue/Green deployments with Terraform
  • Combining Terraform with Ansible
  • Generating SSH key pairs with the TLS provider
  • Installing software on VMs with remote-exec provisioners

Traditionally, there has been a window of time during software deployments when servers are incapable of serving production traffic. This window is typically scheduled for early morning off-hours to minimize downtime, but it still impacts availability. Zero-downtime deployment (ZDD) is the practice of keeping services always running and available to customers, even during software updates. If a ZDD is executed well, users should not be aware ...

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