Grouping aggregation queries in Gnocchi 4.0.x
In this article, we're going to ask Gnocchi (the OpenStack telemetry storage service) how much memory was used, on average, over the course of each day by each project in an OpenStack environment.
I'm working with an OpenStack "Pike" deployment, which means I have Gnocchi 4.0.x. More …read more
Listing iptables rules with line numbers
You can list
iptables rules with rule numbers using the
--line-numbers option, but this only works in list (
-L) mode. I
find it much more convenient to view rules using the output from
iptables -S or
You can augment the output from these commands with rule numbers with the …read more
Administrivia: Pelican and theme update
Fun with devicemapper snapshots
I find myself working with Raspbian disk images fairly often. A typical workflow is:
- Download the disk image.
- Mount the filesystem somewhere to check something.
- Make some changes or install packages just to check something else.
- Crap I've made changes.
...at which point I need to fetch a new copy …read more