Faster startup for containerized applications with Liberty InstantOn
Liberty InstantOn improves startup times for containerized applications by creating an extra application image layer containing a checkpoint of the application process. When the application image starts, the Liberty runtime restores the application process from that checkpoint.
InstantOn-supported architectures and Java SE levels
InstantOn requires the Linux operating system with kernel version 5.9 or greater.
The following table defines the supported IBM Semeru Java levels and minimum Liberty version for each supported architecture. InstantOn is not supported on Java vendor implementations other than IBM Semeru.
- Java SE 11.0.19+
- Java SE 17.0.7+
- Java SE 21.0.1+
| Architecture | Supported IBM Semeru Java levels | Minimum Liberty version |
|---|---|---|
| Linux X86_64 UBI (amd64) |
|
23.0.0.6 and later |
| Linux on Power (ppc64le) | Java SE 21.0.1+ | 24.0.0.1 and later |
| Linux on IBM Z (s390x) | Java SE 21.0.1+ | 24.0.0.1 and later |
InstantOn-supported WebSphere Liberty features
InstantOn supports a subset of WebSphere Liberty features. If a feature that InstantOn does not support is enabled in the server.xml file, a failure occurs during the checkpoint.
In addition to all the InstantOn-supported features that are listed on the Open Liberty website, InstantOn also supports the following WebSphere Liberty-only features.