Category Archives: Tech

It’s running on names, now. I’ve also restructured the files with the intent to upload it all to github as one package and documented a step-by-step guide, getting this far, at least. Note that I didn’t lose the Zoo data. It’s also generating log files, now, so they can be picked up by logstash (someday)Continue reading “ZooKeeper Up – Again”

BIND doesn’t seem to have a logo, so I picked this. On the off chance anyone sees it, I picked a watermarked picture in the hopes of not running into copyright issues. Aside from the clever name, it’s an interesting site. My virtual machines now have names (and static IPs) and can see each otherContinue reading “DNS Up”

I have no idea if it is working and I’m going to bed before trying to find out. It is started. Three VMs each with a ZooKeeper, BookKeeper, and Broker running on them. Once I get it tested, I’m definitely arranging this properly and putting it on github. This should not have been so difficult.Continue reading “Pulsar Up”

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”

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”

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”

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”

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”

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”