github.com/sl1pm4t/consul@v1.4.5-0.20190325224627-74c31c540f9c/website/source/docs/enterprise/upgrades/index.html.md (about)

     1  ---
     2  layout: "docs"
     3  page_title: "Consul Enterprise Automated Upgrades"
     4  sidebar_current: "docs-enterprise-upgrades"
     5  description: |-
     6    Consul Enterprise supports an upgrade pattern that allows operators to deploy a complete cluster of new servers and then just wait for the upgrade to complete.
     7  ---
     8  
     9  # Consul Enterprise Automated Upgrades
    10  
    11  [Consul Enterprise](https://www.hashicorp.com/consul.html) supports an [upgrade
    12  pattern](/docs/guides/autopilot.html#upgrade-migrations)
    13  that allows operators to deploy a complete cluster of new servers and then just wait
    14  for the upgrade to complete. As the new servers join the cluster, server
    15  introduction logic checks the version of each Consul server. If the version is
    16  higher than the version on the current set of voters, it will avoid promoting
    17  the new servers to voters until the number of new servers matches the number of
    18  existing servers at the previous version. Once the numbers match, Autopilot will
    19  begin to promote new servers and demote old ones.