Is it possible for a kubernetes operator to watch files in a Persistent Volume Claim(PVC)? I am creating a k8s Golang operator to deploy and manage my application. The application pods will have a mounted volume. I need to be able to stop and start a pod if configuration files are changed on the PVC. Is this possible? I can see in the documentation that I can add a watcher for PVC but not sure if this also watches files updates or changes.
Can a Kubernetes operator watch files in PVC
879 Views Asked by F. K. At
1
There are 1 best solutions below
Related Questions in KUBERNETES
- Add image to JCheckBoxMenuItem
- How to access invisible Unordered List element with Selenium WebDriver using Java
- Inheritance in Java, apparent type vs actual type
- Java catch the ball Game
- Access objects variable & method by name
- GridBagLayout is displaying JTextField and JTextArea as short, vertical lines
- Perform a task each interval
- Compound classes stored in an array are not accessible in selenium java
- How to avoid concurrent access to a resource?
- Why does processing goes slower on implementing try catch block in java?
Related Questions in OPERATOR-SDK
- Add image to JCheckBoxMenuItem
- How to access invisible Unordered List element with Selenium WebDriver using Java
- Inheritance in Java, apparent type vs actual type
- Java catch the ball Game
- Access objects variable & method by name
- GridBagLayout is displaying JTextField and JTextArea as short, vertical lines
- Perform a task each interval
- Compound classes stored in an array are not accessible in selenium java
- How to avoid concurrent access to a resource?
- Why does processing goes slower on implementing try catch block in java?
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Popular # Hahtags
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
As mentioned in the comments, you would need a ReadWriteMany-capable volume provider but then sure. This isn't how most operators work so you'll have to manage the file watch yourself but there's some good low-level inotify bindings available and I think Viper can reload on the fly itself. Combine that with a channel watch in controller-runtime and a background goroutine interfacing with the file watch that injects reconcile events, and you should be all set.
That said, RWX volumes are to be avoided unless absolutely necessary as all existing providers (NFS, CephFS, etc) each come with notable downsides and caveats to be aware of. Also this is not the general model of how operators should work, they should be API-driven. A possibly better approach is instead of a shared RWX volume containing the config, have a controller-like sidecar in each pod that's watching the API and regenerating the config in a pod-shared emptyDir volume. That's basically how most Ingress Controllers work, so you could use those as an example.