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etcdenv

Etcdenv provide a convenient way to populate environments variables from one your etcd directory

Installation

Easy! You can just download the binary from the command line:

  • Linux
curl -sL https://github.com/upfluence/etcdenv/releases/download/v0.0.1/etcdenv-linux-amd64-0.0.1 > etcdenv
  • OSX
curl -sL https://github.com/upfluence/etcdenv/releases/download/v0.0.1/etcdenv-darwin-amd64-0.0.1 > etcdenv

If you would prefer compile the binary (assuming buildtools and Go are installed) :

git clone git@github.com:upfluence/etcdenv.git
cd etcdenv
go get github.com/tools/godep
GOPATH=`pwd`/Godeps/_workspace go build -o etcdenv .

Usage

Options

Option Default Description
server, s http://127.0.0.1:4001 Location of the etcd server
namespace, n /environments/production Etcd directory where the environment variables are fetched. You can watch multiple namespaces by using a comma-separated list (/environments/production,/environments/global)
shutdown-behaviour, b exit Strategy to apply when the process exit, further information into the next paragraph
watched, w "" A comma-separated list of environment variables triggering the command restart when they change

Shutdown strategies

  • restart: etcdenv rerun the command when the wrapped process exits
  • exit: The etcdenv process exits with the same exit status as the wrapped process's
  • keepalive: The etcdenv process will stay alive and keep looking for etcd changes to re-run the command

Command line

The CLI interface supports all of the options detailed above.

Example

Assuming a etcd server is launched on your machine

You can print env variables fetched from the / directory of your local node of etcd

$ curl -XPOST -d "value=bar" http://127.0.0.1:4001/v2/keys/FOO
$ etcdenv -n / -r false printenv
# ... your local environment variables
FOO=bar
$

You can also follow the changes of the directory

$ curl -XPOST -d "value=bar" http://127.0.0.1:4001/v2/keys/FOO
$ etcdenv -n / printenv &
# ... your local environment variables
FOO=bar
$ curl -XPOST -d "value=buz" http://127.0.0.1:4001/v2/keys/FOO
2014/12/29 00:30:00 Restarted
# ... your local environment variables
FOO=buz

To watch a set of keys only

$ curl -XPOST -d "value=google.com" http://127.0.0.1:4001/v2/keys/GOOGLE_URL
$ etcdenv -n / -w "FOO,GOOGLE_URL" printenv &
# ... your local environment variables
GOOGLE_URL=google.com
$ curl -XPOST -d "value=foo" http://127.0.0.1:4001/v2/keys/BAR
# ... the running command does not restart
$ curl -XPOST -d "value=baz" http://127.0.0.1:4001/v2/keys/FOO
# ... your local environment variables
FOO=baz

Contributing