Hello,
I wanted to let everyone know about a tool I have been working on. I'm
calling it gantry (a type of crane that I see every day on my commute
on BART to SF and inspired by crane). I started working on it after
seeing crane (https://github.com/getwoven/crane) and seeing the
possibilities while also suffering the frustration of using capistrano
for deployment of a few non-rails apps (PHP to be specific). I was
longing for something simpler and found fabric (http://fabfile.org)
but I was disappointed when I learned that all commands are executed
sequentially (this has since been fixed I believe). I also wanted to
spend more time with clojure and see how it could be used for system
administration and scripting.

Gantry comes in two parts. The first is a command line tool and task
macro. You define tasks and the commands specified in those tasks
(provided by gantry.run) are run in parallel on each host using agents/
send-off. Here is a quick start:

$ curl -L https://github.com/downloads/drsnyder/gantry/gantry >
gantry; chmod +x gantry

$ cat > gantryfile
(use 'gantry.run)
(task hello
   (run (format "echo \"hello %s at $(hostname)\"" (:name (get-args
(get-config))))))
^D

$ ./gantry -H one.myhost.com,two.myhost.com -t hello -s name=bob
INFO [one.myhost.com] hello bob at one.myhost.com
INFO [two.myhost.com] hello bob at two.myhost.com

The second part is a library for running commands remotely on one or
more hosts. Here are some examples:

(use 'gantry.run)

(remote "host.com" "yum install -y atop")
(remote "host.com" "yum install -y atop" {:user "deployer"})

(remote* ["host.com", "host2.com"] "yum install -y atop" {:user
"deployer"})

(upload "host.com" "filea" "/tmp")
(upload "host.com" ["filea", "fileb"] "/tmp" {:port 222})

(upload* ["host.com", "host2.com"] ["filea", "fileb"] "/tmp" {:id "/
home/deployer/my-key"})

The jar is in clojars. Use [gantry "0.0.1-SNAPSHOT"] in your
dependencies. See https://github.com/drsnyder/gantry for the
documentation and source.

Feedback welcome!

Damon

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