CODEWITHSUNDEEP
chef-infra
user3540835
user3540835

Reputation: 453

How to handle rolling restarts through chef

How can a rolling restart of a cluster be handled through chef where change done on one of the node of cluster will lead to restarting/reconfiguration of other nodes in a cluster in a specific sequence.

Is it ideal to initiate remote shh connections from inside a recipe running on one node to other nodes of a cluster to do such reconfiguration?

Upvotes: 1

Views: 677

Answers (2)

Ivan
Ivan

Reputation: 3836

You can do so by using some state. chef-dominodes does so with help of databags

dominodes 'rolling_apache_restarts'
  recipe do
    execute 'service apache2 restart'
  end

  action :nothing
end

Upvotes: 1

StephenKing
StephenKing

Reputation: 37580

By default, the chef clients check in at different times (in a repeating interval). Therefore, usually the apply the changes at different times.

There is no coordination built in that would trigger the chef-client runs (e.g. triggered by a push job) in a coordinated way.

Upvotes: 1

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