dgrove-oss commented on a change in pull request #4627: Add descriptions how to 
update, remove or rename runtime kinds and language families
URL: https://github.com/apache/openwhisk/pull/4627#discussion_r325135023
 
 

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 File path: docs/actions-update.md
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+## Updating Action Language Runtimes
+
+OpenWhisk supports [several languages and 
runtimes](actions.md#languages-and-runtimes) that can be made
+available for usage in an OpenWhisk deployment. This is done via the [runtimes 
manifest](actions-new.md#the-runtimes-manifest).
+
+Over time, you may have the need for change:
+
+* Update runtimes to address security issues - for example, the latest code 
level of Node.js 10.
+* Remove runtime versions that are no more supported - for example, Node.js 6.
+* Add more languages due to user demand.
+* Remove languages that are no more needed.
+
+While adding and updating languages and runtimes is pretty straightforward, 
removing or renaming languages and runtimes
+requires some caution to prevent problems with existing actions.
+
+### Updating runtimes
+
+Follow these steps to update a particular runtime kind:
+
+1. Update the runtimes' container image.
+2. Update the corresponding `image` property in the [runtimes 
manifest](actions-new.md#the-runtimes-manifest) to use the new container image.
+3. Restart / re-deploy controllers and invokers such that they pick up the 
changed runtimes manifest.
+
+Already existing actions of the changed runtime kind will immediately use the 
new container image when the invoker creates a new action container.
+
+Apparently, this approach should only be used if existing actions do not break 
with the new container image. If a new container image is supposed to break 
existing actions, introduce a new runtime kind.
 
 Review comment:
   Apparently ==> Obviously ?

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