How to take JMap dump inside elasticsearch docker container?

Elastic Stack Elasticsearch
1

I am running elasticsearch using docker container, and i want to take the heap dump of the elasticsearch.

When I exec inside the container, I couldn't find jmap inside it.

I tried installing openjdk8 package since the container runs on alphine, but I am getting permission denied error.

/usr/share/elasticsearch/bin $ apk add openjdk8
ERROR: Unable to lock database: Permission denied
ERROR: Failed to open apk database: Permission denied

/usr/share/elasticsearch/bin $ find / -name jmap
find: /root: Permission denied
find: /proc/tty/driver: Permission denied
/usr/share/elasticsearch/bin $
2

May be you need to sudo or run as root?

3

It is running on alphine docker container, sudo command is not there.

4

Would something like that work?

docker exec -it -u root /bin/bash
5

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