redis 连接池 demo

启动　

$ rebar3 shell

===> Verifying dependencies...
===> Compiling redis
Erlang/OTP 18 [erts-7.3] [source] [64-bit] [smp:4:4] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V7.3  (abort with ^G)
1> application:start(eredis).
ok
2> application:start(poolboy).
ok
3> application:start(redis).
ok
4> redis:get().
{ok,<<"bar">>}
5>