To start with libkv, we need to understand how to call its APIs first. Here's the libkv Store interface in Go, for every store implementation:

type Store interface {
   Put(key string, value []byte, options *WriteOptions) error
   Get(key string) (*KVPair, error)
   Delete(key string) error
   Exists(key string) (bool, error)
   Watch(key string, stopCh <-chan struct{}) (<-chan *KVPair, error)
   WatchTree(directory string, stopCh <-chan struct{}) (<-chan  
       []*KVPair, 
       error)
   NewLock(key string, options *LockOptions) (Locker, error)
   List(directory string) ([]*KVPair, error)
   DeleteTree(directory string) error
   AtomicPut(key string, value []byte, previous *KVPair, options 
       *WriteOptions) (bool, *KVPair, error)
   AtomicDelete(key string, previous *KVPair) (bool, error)
   Close()
}

We need to know how to Put, Get, Delete, and Watch to basically interact with a store.

Make sure you also have Go and Git installed on your machine and the Git executable is on your PATH. Then, we need to do a number of go get to install dependencies for our program:

$ go get github.com/docker/libkv
$ go get github.com/davecgh/go-spew/spew
$ go get github.com/hashicorp/consul/api

Here we provide with a skeleton. You need to start a single-node Consul before you try to run the following program:

# Delete all keys in Consul
$ curl -X DELETE http://localhost:8500/v1/kv/?recurse
# Compile the program
$ go build main.go
# Run it
$ ./main
# Spew is dumping the result for us in details
([]*store.KVPair) (len=1 cap=2) {
(*store.KVPair)(0x10e00de0)({
 Key: (string) (len=27) "docker/nodes/127.0.0.1:2375",
 Value: ([]uint8) (len=14 cap=15) {
  00000000  31 32 37 2e 30 2e 30 2e  31 3a 32 33 37 35        
      |127.0.0.1:2375|
 },
 LastIndex: (uint64) 736745
})
}

You can also test getting your value with curl. The value you've put should be there. We should continue playing with the libkv APIs,which are Get and Delete. It's left for the readers as an exercise.