[GitHub] [spark] jlpedrosa edited a comment on issue #24962: [SPARK-28149][K8S] Added variable to disable negative DNS caching

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jlpedrosa edited a comment on issue #24962: [SPARK-28149][K8S] Added variable to disable negative DNS caching
URL: https://github.com/apache/spark/pull/24962#issuecomment-515020132
 
 
   Hi @vanzin  @erikerlandson 
   
   I've tested the approach suggested and it works, the process is a bit cumbersome for the user. So it is a question of usability, 
   
   1) Create docker spark images (generic ones, in my case I used master)
   2) Create a modified version of the java security file.
   3) Push the config map to k8s
   4) Create a template that contains the volumes and the mounts
   5) Create custom spark images based on 1)  ~~including 2) (-java.security.properties can be only mounted from local.)~~ 
   6) Run spark submit using the images on 5) and using 4) as a template: 
   
   ```
   --conf spark.kubernetes.driver.podTemplateFile=....vtemplate.yaml \
   --conf 'spark.driver.extraJavaOptions=-Djava.security.properties=/etc/config_mount/jvm.java.security'     
   ```
   
   sample template:
   ```
   spec:
     containers:
       - volumeMounts:
         - name: config-volume
           mountPath: /etc/config_mount
     volumes:
       - name: config-volume
         configMap:
           name: jvm-opts-no-dns-caching
   ```
   

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