cp Command Fails to Copy JAR File to Target Folder [closed]

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I am trying to copy a file (jar file) so that I can run the jar (java -jar) in my pod. But the copy command just doesn't work. The pod logs don't throw any error also.

My deployment.yaml looks like (in brief):

- name: glowroot-jar-init-container
image: "{{ .Values.images.repository }}/{{ .Values.config.aptm.image }}"
securityContext:
  runAsUser: 1000
  runAsGroup: 1000
  runAsNonRoot: true
  readOnlyRootFilesystem: true
imagePullPolicy: {{ .Values.images.pullPolicy }}
command: ["cp","/opt/tools/aptm/glowroot.jar","/aptm"]
volumeMounts:
  - name: aptm-data-glowroot
    mountPath: /aptm
.
.
.
.
.
.
containers:
- name: {{ template "name" . }}
  image: "{{ .Values.images.repository }}/com.gtt.ecomp.vod.dev/vod:{{ .Values.images.vodTag }}"
  imagePullPolicy: {{ .Values.images.pullPolicy }}
  securityContext:
    runAsUser: 1000
    runAsGroup: 1000
    runAsNonRoot: true
    readOnlyRootFilesystem: true
  command:
    - sh
    - -c
    - -x
    - >
      .
      .
      .
      .
      
      echo "Copying aptm JAR."
      cp /usr/local/tomcat/webapps/vod/WEB-INF/lib/hram-agent-0.13.jar /opt/tools/aptm;

      .
      .
      .

      bash /mounted-config/start_tomcat.sh;
  args:
  - "30000"
.
.
.
.
- name: aptm-data
  mountPath: /opt/tools/aptm
- name: aptm-data-glowroot
  mountPath: /aptm
.
.
.
.
- name: aptm-data
  emptyDir: {}
- name: aptm-data-glowroot
  emptyDir: {}
 .
 .
 .

The file hram-agent-0.13.jar is present in the WEB-INF/lib/ folder. But when I do a bash and get into the pod to check the if the jar file was copied or not I do not see it.

vodadmin@vod-58867c5dc6-lg8ch:/usr/local/tomcat/webapps/vod/WEB-INF/lib$ ls -lrt hr*
-rw-r--r-- 1 vodadmin vodadmin 13864793 Apr 25 12:56 hram-agent-0.13.jar
vodadmin@vod-58867c5dc6-lg8ch:/usr/local/tomcat/webapps/vod/WEB-INF/lib$

But when cd to the target folder:

vodadmin@vod-58867c5dc6-lg8ch:/opt/tools/aptm$ ls -lrt
total 0

All the trouble started when I changed everything to read only root file system in my pod.

You'd usually do this with a Dockerfile COPY command, much earlier in the build-test-and-deploy process. You shouldn't need any special setup for your application to be in the image: you're deploying. — David Maze
– David Maze, Commented Jun 19 at 20:53

Paul Hodges · Accepted Answer · 2025-06-19 18:11:03Z

1

Just a quick guess -

When you use > in a yaml, it stacks the lines of its data together into one line.

   - >
      echo "Copying aptm JAR."
      cp /usr/local/tomcat/webapps/vod/WEB-INF/lib/hram-agent-0.13.jar /opt/tools/aptm;
      . . .

becomes

echo "Copying aptm JAR." cp /usr/local/tomcat/webapps/vod/WEB-INF/lib/hram-agent-0.13.jar /opt/tools/aptm;

which I bet outputs

Copying aptm JAR. cp /usr/local/tomcat/webapps/vod/WEB-INF/lib/hram-agent-0.13.jar /opt/tools/aptm

So add a semicolon after the echo statement. Then

   - >
      echo "Copying aptm JAR.";
      cp /usr/local/tomcat/webapps/vod/WEB-INF/lib/hram-agent-0.13.jar /opt/tools/aptm;
      . . .

becomes

echo "Copying aptm JAR."; cp /usr/local/tomcat/webapps/vod/WEB-INF/lib/hram-agent-0.13.jar /opt/tools/aptm;

and might work.

Or use a | instead, which preserves the internal newlines.

I'm still suspicious of how the syntax gets delivered to the parser, though. Maybe write a script that wraps all that in a simpler call, and rebuild it into your image?

edited Jun 19 at 18:11

answered Jun 19 at 18:05

Paul Hodges

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2 Comments

hell_storm2004 Jun 20 at 13:33

Thanks for the answer. That was a lifesaver. It worked. Silly of me to miss the semi-colon.

Paul Hodges Jun 20 at 18:58

It wouldn'tr matter in a normal script - It's more YAML than Bash. Deployment yamls layer abstraction into everything. Think about design, though. We build & deploy hundreds of different images - mostly different services written in java or Node.js - across multiple apps, environments, & clusters with a common Dockerfile & a common Helm chart for all, using a common gitlab library file included in the CI file of each repo with a few carefully abstracted & standardized variables to set behavior. Automation rocks, but it takes a lot of work to get all the kinks out, lol

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