CODEWITHSUNDEEP
cloud-foundry
Ankit Goel
Ankit Goel

Reputation: 93

How are service nodes restored in CloudFoundry?

DEA's in CloudFoundry have a self healing infrastructure. Using the health monitor CF ensures that if a DEA crashes than a substitute should be spawned with the required runtime artifacts.

But how about service nodes? Do they have a self healing infrastructure as well? What if the VM having my MySQL instance crash? What will happen in this case - I can think of following options which one (if any) is correct?

  1. Health Monitor detects that the MySql node is down. So it creates a new MySQL node and restores the data on this new VM

  2. It is the responsibility of the MySQL node/provioner to monitor the node health and take necessary actions if the VM goes down

  3. No self healing infrastructure - The app to which this MySQL node was serving will not work

Regards, Ankit

Upvotes: 0

Views: 220

Answers (1)

Martin
Martin

Reputation: 1083

There are no self healing services in Cloud Foundry, that is handled in the layer below Cloud Foundry - BOSH. However, broken services can't be self-healed the same way an app can, they require human intervention (inspection). If the service process has just crashed, it will be automatically restarted, but if you have a database corruption a human is needed to solve it.

The healing of services is dependent on the service itself, e.g. in MySQL you need to use a HA setup, and in Redis you have to use replication.

Upvotes: 1

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