為什麼要安裝Erlang

有一些應用程式和系統，其中Erlang具有重要作用：RabbitMQ，面向訊息的中介軟體是用Erlang程式語言編寫的。WhatsApp使用Erlang來執行訊息伺服器。亞馬遜，雅虎，Facebook，摩托羅拉和Github等許多大公司正在使用Erlang。

一、關於Erlang的簡單介紹

我來驗證下。唉，現在的部落格都太不靠譜了，都沒有驗證測試，就寫出來。誤導大家，浪費大家的時間和精力。

二、下載包

首先要去Erlang官網下載一個最新的安裝包。
不推薦通過apt-get會發現找不到源，或者很久沒有更新，安裝的都是老舊的。
官方包下載地址

三、把包傳到機器上去

四、執行安裝操作

1、執行安裝操作

dpkg -i esl-erlang_21.0-1_ubuntu_artful_amd64.deb

它會說，我缺少很多相關的依賴。

[email protected]:/home/erlang# dpkg -i esl-erlang_21.0-1_ubuntu_artful_amd64.deb 
Selecting previously unselected package esl-erlang.
(Reading database ... 60202 files and directories currently installed.)
Preparing to
 
 unpack esl-erlang_21.0-1_ubuntu_artful_amd64.deb ...
Unpacking esl-erlang (1:21.0) ...
dpkg: dependency problems prevent configuration of esl-erlang:
 esl-erlang depends on libwxbase2.8-0 | libwxbase3.0-0 | libwxbase3.0-0v5; however:
  Package libwxbase2.8-0 is not installed.
  Package libwxbase3.0-0 is not installed.
  Package
 
 libwxbase3.0-0v5 is not installed.
 esl-erlang depends on libwxgtk2.8-0 | libwxgtk3.0-0 | libwxgtk3.0-0v5; however:
  Package libwxgtk2.8-0 is not installed.
  Package libwxgtk3.0-0 is not installed.
  Package libwxgtk3.0-0v5 is not installed.
 esl-erlang depends on libsctp1; however:
  Package libsctp1 is not installed.

dpkg: error processing package esl-erlang (--install):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 esl-erlang

2、解決依賴問題

按照要求解決依賴：
例如：

[email protected]:/home/erlang# apt-get install libwxbase3.0-0v5
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 esl-erlang : Depends: libwxgtk2.8-0 but it is not installable or
                       libwxgtk3.0-0 but it is not installable or
                       libwxgtk3.0-0v5 but it is not going to be installed
              Depends: libsctp1 but it is not going to be installed
              Recommends: erlang-mode but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

這個時候你需要執行：

apt-get -f install

然後會讓你同意輸入一個y。
大概需要五分鐘去執行。

3、再次執行安裝操作

[email protected]:/home/erlang# dpkg -i esl-erlang_21.0-1_ubuntu_artful_amd64.deb 
(Reading database ... 79229 files and directories currently installed.)
Preparing to unpack esl-erlang_21.0-1_ubuntu_artful_amd64.deb ...
Unpacking esl-erlang (1:21.0) over (1:21.0) ...
Setting up esl-erlang (1:21.0) ...
[email protected]:/home/erlang# 

4、檢查是否安裝成功

這樣就安裝成功了。

root@ubuntu:/home/erlang# erl
Erlang/OTP 21 [erts-10.0] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:1] [hipe]

Eshell V10.0  (abort with ^G)
1> 

有圖有真相

我覺得，做技術最重要的是嚴謹，現在有些部落格啊，到處搬運，都沒有經過測試，就發出來，結果呢。
結果就是都不靠譜。