title: How to solve panic: no reachable servers
body: <p>I am trying to use a Raspberry pi to host a leanote,when i try to run the leanote binary it keep give me this error where no reachable host, what could be the Possible reason?</p>
  
  <pre><code>Panic: no reachable servers
  
  goroutine 1 [running]:
  github.com/leanote/leanote/app/db.Init(0x111a4ab0, 0x21, 0x1103c46a, 0x7)
          /Users/life/Documents/Go/package_base/src/github.com/leanote/leanote/app/db/Mgo.go:104 +0x500
  github.com/leanote/leanote/app.init.1.func27()
          /Users/life/Documents/Go/package_base/src/github.com/leanote/leanote/app/init.go:413 +0x2c
  github.com/revel/revel.runStartupHooks()
          /Users/life/Documents/Go/package_base/src/github.com/revel/revel/server.go:135 +0x70
  github.com/revel/revel.Run(0x1f90)
          /Users/life/Documents/Go/package_base/src/github.com/revel/revel/server.go:92 +0x20c
  main.main()
          /Users/life/leanote2/app/tmp/main.go:2294 +0x4f3c4
  
  goroutine 9 [sleep]:
  time.Sleep(0x1dcd6500, 0x0)
          /Users/life/app/go1.5.1/src/runtime/time.go:59 +0x104
  gopkg.in/mgo%2ev2.(*mongoCluster).syncServersLoop(0x110c50e0)
          /Users/life/Documents/Go/package_base/src/gopkg.in/mgo.v2/cluster.go:383 +0x410
  created by gopkg.in/mgo%2ev2.newCluster
          /Users/life/Documents/Go/package_base/src/gopkg.in/mgo.v2/cluster.go:76 +0x1c4
  
  goroutine 49 [sleep]:
  time.Sleep(0x2a05f200, 0x1)
          /Users/life/app/go1.5.1/src/runtime/time.go:59 +0x104
  gopkg.in/mgo%2ev2.(*mongoServer).pinger(0x111de0a0, 0x1)
          /Users/life/Documents/Go/package_base/src/gopkg.in/mgo.v2/server.go:297 +0x180
  created by gopkg.in/mgo%2ev2.newServer
          /Users/life/Documents/Go/package_base/src/gopkg.in/mgo.v2/server.go:90 +0x140
  
  goroutine 52 [sleep]:
  time.Sleep(0x2a05f200, 0x1)
          /Users/life/app/go1.5.1/src/runtime/time.go:59 +0x104
  gopkg.in/mgo%2ev2.(*mongoServer).pinger(0x10f0c460, 0x1)
          /Users/life/Documents/Go/package_base/src/gopkg.in/mgo.v2/server.go:297 +0x180
  created by gopkg.in/mgo%2ev2.newServer
          /Users/life/Documents/Go/package_base/src/gopkg.in/mgo.v2/server.go:90 +0x140
  </code></pre>
  
  <p>sorry i am new to this XD</p>