Balancing (#107)

* Balancing integration
* Signals handling SIGHUP triggers configuration reload, SIGINT gracefully shutsdown server

README.md

@@ -15,8 +15,8 @@
 Akubra is a simple solution to keep an independent S3 storages in sync - almost
 realtime, eventually consistent.
 
-Keeping synchronized storage clusters, which handles great volume of new objects
-(about 300k obj/h), is the most efficient by feeding them with all incoming data
+Keeping synchronized storage clusters, which handles great volume of new objects,
+is the most efficient by feeding them with all incoming data
 at once. That's what Akubra does, with a minimum memory and cpu footprint.
 
 Synchronizing S3 storages offline is almost impossible with a high volume traffic.
@@ -37,6 +37,11 @@ It also backtracks to older cluster when requested for not existing object on
 target cluster. This kind of events are logged, so it's possible to rebalance
 clusters in background.
 
+### Multi cloud cost optimization
+While all objects has to be written in every storage from shard, not all storages
+has to be read. With load balancing and storage prioritization akubra will peak
+cheapest one.
+
 ## Build
 
 ### Prerequisites
@@ -153,32 +158,6 @@ Service:
           IdleConnTimeout: 2s
           ResponseHeaderTimeout: 2s
 
-# MaxIdleConns see: https://golang.org/pkg/net/http/#Transport
-# Default 0 (no limit)
-MaxIdleConns: 0
-# MaxIdleConnsPerHost see: https://golang.org/pkg/net/http/#Transport
-# Default 100
-MaxIdleConnsPerHost: 100
-# IdleConnTimeout see: https://golang.org/pkg/net/http/#Transport
-# Default 0 (no limit)
-IdleConnTimeout: 0s
-# ResponseHeaderTimeout see: https://golang.org/pkg/net/http/#Transport
-# Default 5s
-ResponseHeaderTimeout: 5s
-# DisableKeepAlives see: https://golang.org/pkg/net/http/#Transport
-# Default false
-
-DisableKeepAlives: false
-
-# Maximum accepted body size
-BodyMaxSize: "100M"
-# Maximum number of incoming requests to process at once
-MaxConcurrentRequests: 200
-# Backend in maintenance mode. Akubra will skip this endpoint
-
-# MaintainedBackends:
-#  - "http://s3.dc2.internal"
-
 # List request methods to be logged in synclog in case of backend failure
 SyncLogMethods:
   - PUT