Was that a nightmare. They refused to talk to each other. It would have been easier if I had had any confidence in the VM network, but since I didn’t know if that was failing or not, there were many more variables. The answer was simple, but “simple” does not mean “easy”. There are fiveContinue reading “ZooKeeper Up”
Author Archives: Mark
Python Adventures
I cheated. I’m running Cassandra 3.11 in docker containers. The shell (cqlsh) is a Python script that runs fine in docker, if you can figure out how: I want cross-VM access, so I need to run it outside of docker. I haven’t figured out how to give Virtual Box VMs DNS names, so I usedContinue reading “Python Adventures”
Zoo & Book Up
Wow. That was harder than Cassandra and I still haven’t started on Pulsar. A few notes: ZooKeeper needs persistent volumes. BookKeeper expects some metadata to be there. If you don’t persist it, you end up with race conditions when they start (as each one tries to bootstrap the metadata). Get the right image from dockerhub.Continue reading “Zoo & Book Up”
Distributed Systems & Failure
I have a three node Cassandra cluster running. It’s three containers on one virtual machine. Pulsar is next. I decided on a new virtual machine from the same base image the Cassandra one started from. That way, it’s free of any “Cassandra pollution”. And I have been taking notes, so I know what I didContinue reading “Distributed Systems & Failure”
Cassandra Up
I’ve always thought “Cassandra” was a particularly ill-omened name, so I went with the picture, not the logo. Subtitle: How did I function before the Internet? It was a bit painful, but I did it. A three node Cassandra cluster configured in docker-compose inside a CentOS VM running on Windows 10. The volume configuration isContinue reading “Cassandra Up”
HOAs
Want to guess where the HOA boundary ends? To be fair, I also have a beige house.
O Deer
I knew I should have bought a K-bar when they were on sale at Amazon. But, no, I think to myself, I think, “whatever would I use it for?”
Insanity – In Space
Space (dot.com!) published an article about NASA’s DART mission by Meghan Bartels. It starts off fine, with a description of the mission and its historic first-ness. The factual section ends with: It’s just one rock, just a small change. Just to reduce the odds that we humans go the way of the dinosaurs. But DART’sContinue reading “Insanity – In Space”
Too Much Music
Years ago, The Laird ripped all of our CDs to a NAS. Then we rearranged the computers and I never got around to getting the NAS hooked up. After the move, I did, although it took more effort than expected: I had lost the power supply, but Chris’s found one for me. It’s running anContinue reading “Too Much Music”
VR Up
The old computer had no USB-C port and didn’t have the gumption to do VR, anyway. I’ve got both Oculus and Steam up and running. The USB-C cable that comes with the Oculus is WAY too short. I’ll look for one when I go looking for mono-to-RCA cables and a UPS at Chris’s (support localContinue reading “VR Up”
Marked Up 