https://github.com/coreos/etcd%|%etcd%|% is a highly-available key value store for shared configuration and service discovery written in the [Go] language. Together with fleet, it forms the core of the cloud-specific linux distribution called https://coreos.com/%|%CoreOS%|%. A Tcl https://github.com/efrecon/etcd-tcl%|%implementation%|% of the https://coreos.com/docs/distributed-configuration/etcd-api/%|%API%|% is available on github.  It was originally a component of the [biot] project, but being self-contained, was forked out as a separate project.

[EF] 2015-01-21 An earlier version of this API used `::etcd::set` and `::etcd::get` to set and get keys, which interfered with the regular `set`.  The new version uses a different naming convention, in line with the https://github.com/jplana/python-etcd%|%python API implementation%|%.  The new version also uses more complex semantics for `::etcd::read`, `::etcd::write` and `::etcd::delete`, procedures that are used by most of the remaining procedures.

======
# Create a new connection context (defaults to default port on localhost)
set c [::etcd::new]

# Create a directory, and a sub-directory
::etcd::mkdir $c /onedir
::etcd::mkdir $c /onedir/asubdir

# Create and set a key:
::etcd::write $c /onedir/asubdir/test "Hello World"

# Get back the key
set k [::etcd::read $c /onedir/asubdir/test]

# Remove the key
::etcd::delete $c /onedir/asubdir/test

# Remove the directories, recursively
::etcd::rmdir $c /onedir 1
======

For a more detailed documentation, consult the https://github.com/efrecon/etcd-tcl/blob/master/README.md%|%online manual%|%.

While most operations can be performed using `curl`, `etcd` comes with a simple CLI client called. I have made available a https://github.com/efrecon/etcd-ctl%|%(re)implementation of this client%|%, in Tcl. This is more meant as a testbed for the library above, but it also implements a functionality that is missing from the standard client, i.e. the ability to easily push the content of one or several files to the etcd key-space, using the same name as the file. Thus implementing a simplistic file mirroring facility.

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