Kali linux2.0里Metasploit的postgresql selected, no connection问题解决

说在前面的话

1、在kali中metasploit默认使用postgresql作为它的数据库；
　　想要开启metasploit服务首先得打开postgresql数据库，
　　命令如下：（或者：/etc/init.d/postgresql start）;
　　因为在kali中所有的服务都不是默认开机自启的，
　　所以想要开机自启，命令如下：update-rc.d postgresql enable。

2、初次使用数据库服务时需初始化，以便创建系统默认的数据库及数据库用户；
　　命令如下：msfdb init（默认创建的数据库名：msf，msf_test;用户名：msf；口令默认为空）

3、接下来就是启动metasploit的时候了；
　　在kali2.0之后，只需启动msf控制台即可；
　　命令如下：msfconsole。
　　（kali2.0之前的命令是这样的：service metasploit start；对于2.0之后不管用）

　　问题详情

msf > db_status
[*] postgresql selected, no connection
msf > 

运行  service Metasploit start 无任何反应，提醒报错：
Failed to start metasploit.service: Unit metasploit.service failed to load: No such file or directory.

解决办法

　　对于命令解释
　　msfdb init 　　 # initialize the database
　　msfdb reinit 　　 # delete and reinitialize the database
　　msfdb delete　　 # delete database and stop using it
　　msfdb start 　　 # start the database
　　msfdb stop 　　 # stop the database

root@kali:~# msfdb reinit
Creating database user 'msf'
为新角色输入的口令:
再输入一遍:
Creating databases 'msf' and 'msf_test'
Creating configuration file in /usr/share/metasploit-framework/config/database.yml
Creating initial database schema
root@kali:~# msfdb start
root@kali:~# msfconsole

     .~+P``````-o+:.                                      -o+:.
.+oooyysyyssyyssyddh++os-`````                        ```````````````          `
+++++++++++++++++++++++sydhyoyso/:.````...`...-///::+ohhyosyyosyy/+om++:ooo///o
++++///////~~~~///////++++++++++++++++ooyysoyysosso+++++++++++++++++++///oossosy
--.`                 .-.-...-////+++++++++++++++////////~~//////++++++++++++///
                                `...............`              `...-/////...`

                                  .::::::::::-.                     .::::::-
                                .hmMMMMMMMMMMNddds\...//M\\.../hddddmMMMMMMNo
                                 :Nm-/NMMMMMMMMMMMMM$$NMMMMm&&MMMMMMMMMMMMMMy
                                 .sm/`-yMMMMMMMMMMMM$$MMMMMN&&MMMMMMMMMMMMMh`
                                  -Nd`  :MMMMMMMMMMM$$MMMMMN&&MMMMMMMMMMMMh`
                                   -Nh` .yMMMMMMMMMM$$MMMMMN&&MMMMMMMMMMMm/
    `oo/``-hd:  ``                 .sNd  :MMMMMMMMMM$$MMMMMN&&MMMMMMMMMMm/
      .yNmMMh//+syysso-``````       -mh` :MMMMMMMMMM$$MMMMMN&&MMMMMMMMMMd
    .shMMMMN//dmNMMMMMMMMMMMMs`     `:```-o++++oooo+:/ooooo+:+o+++oooo++/
    `///omh//dMMMMMMMMMMMMMMMN/:::::/+ooso--/ydh//+s+/ossssso:--syN///os:
          /MMMMMMMMMMMMMMMMMMd.     `/++-.-yy/...osydh/-+oo:-`o//...oyodh+
          -hMMmssddd+:dMMmNMMh.     `.-=mmk.//^^^\\.^^`:++:^^o://^^^\\`::
          .sMMmo.    -dMd--:mN/`           ||--X--||          ||--X--||
........../yddy/:...+hmo-...hdd:............\\=v=//............\\=v=//.........
================================================================================
=====================+--------------------------------+=========================
=====================| Session one died of dysentery. |=========================
=====================+--------------------------------+=========================
================================================================================

                     Press ENTER to size up the situation

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Date: April ,  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%% Weather: It's always cool in the lab %%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%% Health: Overweight %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%% Caffeine:  mg %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%% Hacked: All the things %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

                        Press SPACE BAR to continue

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       =[ metasploit v4.12.41-dev                         ]
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msf > db_status
[*] postgresql connected to msf
msf > 

    则，可以成功！