Dejan has written a guide to using the crmsh history command. For those who are unfamiliar with the history explorer or want to know more about how to use it, this guide is a great introduction to what it does and how to use it.

History is not a new crmsh feature, but, as we failed to advertise it and nothing works without proper marketing, it probably hasn’t seen a very wide use. That’s surely a pity and we hope that this gentle history guide is going to help.

So, if you use crmsh and if you need help troubleshooting clusters (I surely do!), take a look here:

http://crmsh.github.io/history-guide/

FYI, the comprehensive crmsh help also has a short description of the feature:

Goes without saying: all commands are described too.

If you don’t use crmsh, you’ll still find a lot of useful information in the guide, so don’t skip it.

I presented Hawk [1] and the History Explorer interface which builds upon the crmsh history feature at openSUSE conf in The Hague earlier this month. The video of that presentation is online here:

https://www.youtube.com/watch?v=mngfxzXkFLw

[1]: https://github.com/ClusterLabs/hawk

While 2.1.4 is the latest stable release, I am also working on releasing 2.2.0 which will come with a bunch of new features. I’m still working on some of these and not everything is in the repository yet, so 2.2.0 is probably at least a month or so away still. I was perhaps a bit optimistic when I tagged RC1 back in October last year. ;)

However, right now I’d like to focus on one thing that is already in 2.2.0 and which is available if you use the development packages from OBS: command shorthands. This makes crmsh a lot more convenient to use from the command line. Basically, you can use any unambiguous subset of a command name to refer to that command, and crmsh will figure out what you mean. This may sound confusing, so an example will help with explaining what I mean:

This is one way of showing the current cluster configuration:

However, now you can shorten this to the following:

Other examples of shorthand are crm rsc stop r1 or crm st for status. And of course, tab completion in bash still works for the shorthand variants.

The examples used here are not comprehensive. crmsh is pretty clever at figuring out which command was intended. Download the development release and try it out!

For a complete list of changes since the previous version, please refer to the changelog:

Packages for several popular Linux distributions can be downloaded from the Stable repository at the OBS:

Archives of the tagged release:

Changes since the previous release:

Thank you,

Kristoffer and Dejan