...
Typically in a dual master-controller setup every master-controller has its own machine so that maintenance can take place without offline time.
Containerization
In 2018.02 docker support is introduced.
Virtualization
It is very well possible to deploy the master-controller components / forecasting shells in virtualized environments. The Deltares ICT team has most experience with Delft-FEWS on VMWare VSphere with in-depth knowledge but Delft-FEWS is also known to run on Microsoft Hyper-V. Virtualization of the Delft-FEWS back-end services can generally be done without problems. Take into account that (not Delft-FEWS related) modelling software may have other requirements or limitations with respect to virtualization of the Forecasting Shells.
...
FEWS can work with grid computing. Especially when working with heavy computations, e.g. ensemble forecasting or 3d hydraulic computing, this can be an interesting option to explore. It is recommended to contact the Delft-FEWS product management beforehand.
Embedded Java JRE software versions and other dependencies
Java JRE versions (from 2018.02)
++++++ provisional text ++++++++
The new client-package of Delft-FEWS 2018.02 (OC/SA/FSS) will contain an 'embedded' jre (java runtime environment) based on OpenJDK 11. Together with the Delft-FEWS binaries, it forms the Delft-FEWS base-build. The java runtime libraries are placed in an operating system specific sub-folder in the well-known Delft-FEWS bin folder. The jre sub-folders are clearly recognizable under /bin/windows/jre or /bin/linux/jre. This jre can be easily replaced by any other open source or commercially supported version of java 11. Since an Operator Client/Stand Alone and in most cases also Forecasting Shell Server run in a controlled (and secured) environment, it is not necessary to have this jre sub-folder replaced, although it is technically feasible.
...
| Version | Base-build | Operator Client Forecasting Shell | Tomcat |
|---|---|---|---|
Java JRE versions (2017.02 and earlier)
Note that for security reasons, java should never be installed inside a browser. Delft-FEWS should only be using the java JRE in embedded form.
...