rpi-clone VS openJDK-docker

I've been running a bunch of Pi's for years now, and the biggest problem I've had is the Pi itself dying: 24/7 usage is hard on a small device. I've also found that stable power is essential, and to that end I've always used 5v 3a branded power cubes, plugged into a pure sine wave UPS. Choice of micro-SDHC cards is important and I ended up getting ATP industrial cards (https://www.atpinc.com/products/industrial-sd-cards) - expensive but really long-lived. Finally, using RPi-clone (https://github.com/billw2/rpi-clone) on a regular basis has been a life-saver. I clone to Sandisk Extreme micro-SDHCs and can recover from an outage in minutes.

I would normally use the Pi SD-Card copier to duplicate the SD-Card to an SSD but I'm unsure if this is available on the Ubuntu image - you could possibly use this program [Github] if you are not keen on using dd with a running system.

Then you will need to clone the SD to the SSD, you can use many tools that are available from your desktop computer or you can try with rpi-clone, just connect the SSD with Pi booted from SD, stop any possible service/docker to prevent any copy error and run, adapting device naming but usually will be (check device with dmesg):

I used rpi-clone, it was super easy. Whole process took 10 minutes. https://github.com/billw2/rpi-clone

rpi-clone

Install OpenJDK and Java Runtime Environment (JRE) 11

Reloading is nothing new under the sun for Lisp, I believe. For ML and adequate reload-ability, one might be hard pressed, but it's nothing new under the Sun (hint, hint). Maybe too on the nose, but one probably wants good inlining, and thus more "speculative" de/optimisation to preserve redefinition.

If they don't want Oracle's Java, why can't they use a subset of OpenJDK (licensing noob here)?

I think they use a circular queue of functions that is each executed for around 100 ms. I am guessing the system timer is used to generate an interrupt that pauses execution of the current function and starts executing the next function. Apple's Java code is probably closed source. I did find mention of an openjdk here: https://openjdk.java.net. I haven't looked at the source code yet.

https://openjdk.java.net

$ yum info java-1.8.0-openjdk Available Packages Name : java-1.8.0-openjdk Arch : x86_64 Epoch : 1 Version : 1.8.0.322.b06 Release : 1.el7_9 Size : 314 k Repo : updates/7/x86_64 Summary : OpenJDK 8 Runtime Environment URL : http://openjdk.java.net/ License : ASL 1.1 and ASL 2.0 and BSD and BSD with advertising and GPL+ and GPLv2 and GPLv2 with : exceptions and IJG and LGPLv2+ and MIT and MPLv2.0 and Public Domain and W3C and zlib Description : The OpenJDK 8 runtime environment.

For the rest: -+ PIP3 & Python scripts: export REQUESTS_CA_BUNDLE=/path/to/your/certificate.pem python script.py -+ JAVA =java -D'javax.net.ssl.trustStore'="/opt/site/cacerts.JKS" .....= https://serverfault.com/questions/636612/preserve-imported-ca-certificates-through-java-upgrades/636882 https://github.com/docker-library/openjdk/issues/327 -+ Windows server https://docs.microsoft.com/en-us/troubleshoot/windows-server/identity/valid-root-ca-certificates-untrusted certutil .. root fg.cer