lifecycle-hooks

Example: Running skaffold lifecycle hooks

This is a simple example to show how to inject skaffold lifecycles with user-defined hooks.

Run:

skaffold build --cache-artifacts=false

You should see the artifact hooks-example being built along with the execution of a pre-build hook trigger and a post-build hook trigger.

Now with an active kubernetes cluster, run:

skaffold dev

This will start a pod running the hooks-example image. The app simply reads the contents of hello.txt file once and stores it and repeatedly prints it out.

[hooks-example] Hello World!
[hooks-example] Hello World!
[hooks-example] Hello World!
...

If you change the text of hello.txt file, say to Hello World!!, Skaffold will sync it into the running container. You should also see a pre-sync hook that just echoes the filename that has changed, and a post-sync hook that sends a SIGHUP signal to the app. The app responds accordingly by reloading the modified hello.txt file and printing it to the console.

[hooks-example] Hello World!
[hooks-example] Hello World!
[hooks-example] Hello World!
Syncing 1 files for hooks-example:e3c03bbaf0830afb79d586c5a0d5ce7510a027585fb0cbc88db9bd14bfbad139
Starting pre-sync hooks for artifact "hooks-example"...
file changes detected: hello.txt
Completed pre-sync hooks for artifact "hooks-example"
Starting post-sync hooks for artifact "hooks-example"...
[hooks-example] + kill -HUP 1
Completed post-sync hooks for artifact "hooks-example"
Watching for changes...
[hooks-example] Hello World!!
[hooks-example] Hello World!!
[hooks-example] Hello World!!
...