# Which Java JDK is used in the Docker image of Open Source Rundeck? OpenJDK (which version) or Oracle JDK (which version)? In website of https://hub.docker.com/r/rundeck/rundeck/, the info on which Java JDK is used to bake the Docker image of Open Source Rundeck SNAPSHOT (latest master build) 3.2.5 is NOT there. Did Rundeck use OpenJDK or Oracle JDK, and which version? In the section of Environment Variables, "JVM_MAX_RAM_FRACTION=1 The JVM will use 1/x of the max RAM for heap. For example, a setting of 2 will cause the JVM to utilize up to half the container limit for heap. This is replaced in openjdk 10 with a percentage setting that will offer finer control.", Rundeck mentioned OpenJDK 10, but did not provide a configuration sample. Could Rundeck please confirm this and provide a configuration sample using OpenJDK? Thanks. ##### Post Metadata - Posted at: about 6 years ago - Net upvotes: 1 ## Comments ### Comment 1 Hi Yulin, Rundeck uses by default OpenJDK 8, is a requisite (https://docs.rundeck.com/docs/administration/install/system-requirements.html#java). In that sense, if you enter to the container with "docker exec -it YourContainerName bash" and do "java -version" you can see "openjdk version "1.8.0_252". ##### Comment Metadata - Posted at: about 6 years ago ## Related Product [Rundeck](https://www.g2.com/products/rundeck/reviews) ## Related Category [Workload Automation](https://www.g2.com/categories/workload-automation) ## Related discussions - [How well does Trello scale into a larger team?](https://www.g2.com/discussions/1-how-well-does-trello-scale-into-a-larger-team) - Posted at: about 13 years ago - Comments: 6 - [Can we please add a new section](https://www.g2.com/discussions/2-can-we-please-add-a-new-section) - Posted at: about 13 years ago - Comments: 0 - [Quantifiable benefits from implementing your CRM](https://www.g2.com/discussions/quantifiable-benefits-from-implementing-your-crm) - Posted at: about 13 years ago - Comments: 4