I was just about to start looking into doing this myself and for the foreseeable future, I'll probably just use `dsh`... since I'm a cheapskate, have been trying to reduce my usage on cloud tools, and I just found out about it today:

https://www.netfort.gr.jp/~dancer/software/dsh.html.en

Once installed, change the default from rsh to ssh where it's installed e.g. `/usr/local/Cellar/dsh/0.25.10/etc/dsh.conf`

Then setup a group for machines, in this case I'm calling it "web"

> mkdir -p .dsh/group

> echo "some-domain-or-ip" >> .dsh/group/web

> echo "some-domain-or-ip-2" >> .dsh/group/web

Then fire off a command:

> dsh -M -g web -c -- tail -f /var/log/nginx/access.log

> some-domain-or-ip [... log message here ...]

> some-domain-or-ip-2 [... log message here ...]

The flags I used are:

-M "Show machine name"

-g "group to use"

-c run concurrently

That's about as easy as I can think of... /shrug while I like the idea of centralized logging services I haven't really found one I actually cared for... most just run rampant with noise, slow UIs, and strange query languages no one wants to learn. I guess I could start a machine up with `dsh` on it in my cluster and then write the output from dsh to a file... easy centralized logging on the cheap, ha!