ansible_default_ipv4 is not what you think

Most people think that ansible_default_ipv4 is some magical way to guess what IP address is the ‘main’ IP for a server.

It is not.

Clickhouse usage report

I’ve just wrote a comment on Clickhouse database, and I think it’s interesting enough to make it into a separate post.

Use case

Data: Geodistributed reachability information with latency counters, with consistent incoming flow…

Working with multihome systems in Ansible

A new challenge: I got a system which starts with ‘white’ IPs (routable) and switches to private ones as soon as it’s become possible, completely giving up on white IPs. (Reads, server starts as 8.8.8.8 and become 192.168.0.1 after some moment).