I tried to run InfluxData Telegraf on OpenBSD 6.2 but it wasn’t available in the Ports nor was I able to compile a binary from sources. But the latter has changed since I have an OpenBSD 6.3 instance running. Here’s how to compile and run Telegraf on OpenBSD.
I’ve used Elasticsearch on OpenBSD to store my system logs for quite long now. And if it does the job, there are a few things I don’t like so much with it.
I only used a single instance so I was warned about availability. But a sudden power outage had severe impact on my daily data. Way much more than what I expected from a Production-ready software. Rebuilding and re-indexing the data was a real pain in the ass. From time to time, I also get errors about indexing that seem to go away without doing nothing.
The latter is probably due to my low memory server. But I want to store logs for only a couple of boxes. And I don’t want to reserve 4GB of RAM just for this. This “gimme more RAM” manner really annoys me. And as I also need RAM for Logstash (to parse the data and send them to Elasticsearch), this leads to way too much resources consumption.
That said, I decided to test another way for storing the logs : using a RDBMS, namely MariaDB. I already have one running smooth. And I read Grafana was able to read data from it using SQL commands.
This is just a quick note on how to enable MySQL / MariaDB compressed tables. As I plan to store lots of text, I’ll check later on if that’s usefull or not. But I guess it should.
Step 1 was getting my hands on Raspbian. Step 2 was running OpenBSD on the Raspberry Pi 3 Model B. I had quite a few try & fails but it booted, installed and ran properly in the end. Full story follows.
I’ve enabled an OpenBSD unbound(8) daemon that is used as a central DNS cache resolver. Now I needed to know what it was doing and how it performed. The question was answered grabbing statistics from unbound and render them using Grafana.
The whole monitoring stack is composed of Net-SNMP, Telegraf and InfluxDB for the metrics part ; and syslogd(8), Logstash and Elasticsearch for the logs part. Of course, most of those run on OpenBSD (6.3) ; except Telegraf, which is not available (yet).