Problem
I have found that RTMT 10.5 does not run reliably on my Windows 10 PC. It locks up after a short period; sometimes after only a few minutes. The display freezes, and I need to resort to the Windows Task Manager to even close it down. I don't know where the fault lies, but it has been frustrating. In the past I have run the Linux version of RTMT on Mac OS, which was reliable, but I don't currently have a Mac. I set out to see if I could get RTMT to run from Windows Subsystem for Linux.
In this article I assume a basic familiarity with WSL and Linux. For example, I will not describe how to obtain and install Java for WSL, or how to work with X Window.
Prerequisites
You will need to configure Window Subsystem for Linux on your Windows PC. I am running WSL 1 and Ubuntu 20.04, but I expect WSL 2 or other distros would work.
You will need Java installed in WSL -- the Windows version of Java you may have installed will not work. I am using OpenJDK Runtime Environment (build 11.0.7+10-post-Ubuntu-3ubuntu1).
You need an X Window server. I use Xming.
Solution
Sign in to CUCM administration to download RTMT. Applications > Plugins > Find, then use the download link for Cisco Unified Real-Time Monitoring Tool - Linux. This will download the file CcmServRtmtPlugin.bin. Save it to a folder that is accessible by WSL. Anywhere on your C: drive is probably OK. For example, C:\temp can usually be seen from WSL as /mnt/c/temp.
In WSL, change to the folder where you downloaded the file, and run the installer:
$ cd /mnt/c/temp
$ sudo ./CcmServRtmtPlugin.bin
When I ran it, I got the following error:
$ sudo ./CcmServRtmtPlugin.bin: 3319: exec: /tmp/install.dir.3147/Linux/resource/jre/bin/java: Exec format error
I believe this is an incompatibility with WSL or Ubuntu and the JRE that comes with RTMT. The workaround is to use the JRE I already had installed:
$ sudo ./CcmServRtmtPlugin.bin LAX_VM /usr/bin/java
This allowed me to complete the installation. But it wouldn't run, probably for the same reason the standard installation didn't work:
$ cd /opt/Cisco/Unified-Rtmt/JRtmt
$ ./run.sh
./run.sh: line 1: ./jre/bin/java: cannot execute binary file: Exec format error
So I edited run.sh and at the very beginning of the file changed "./jre/bin/java" to "/usr/bin/java"
I wasn't quite done yet. RTMT would launch, but would exit complaining about a missing timezone file:
ERROR rtmt.control - TzDataManager:getStrClientTzVersion:[ERROR]:Ex: /usr/lib/jvm/java-11-openjdk-amd64/lib/zi/ZoneInfoMappings (No such file or directory)
While the RTMT-provided JRE has that timezone file, the JRE I was using did not. So in my JRE, I created a symbolic link. Your Java installation may be in a different folder; adjust these commands as necessary.
$ cd /usr/lib/jvm/java-11-openjdk-amd64/lib
$ sudo ln -s /opt/Cisco/Unified-Rtmt/JRtmt/jre/lib/zi ./zi
Once that link allowed RTMT to find the timezone file, it ran without a hitch. It hasn't crashed on me once, which is a big improvement over the Windows version.
