Mqtt服務器搭建
測試環境:CentOS64位
1.安裝基礎軟件
yum install gcc-c++
yum install cmake
yum install openssl-devel //mosquitto默認支持openssl
2.下載源碼包
wget http://mosquitto.org/files/source/mosquitto-1.4.4.tar.gz wget http://c-ares.haxx.se/download/c-ares-1.10.0.tar.gz --no-check-certificate wget https://github.com/warmcat/libwebsockets/archive/v1.3-chrome37-firefox30.tar.gz
3.解壓源碼包
tar xf c-ares-1.10.0.tar.gz && mv c-ares-1.10.0 /usr/local/src/ tar xf v1.3-chrome37-firefox30 -C /usr/local/src/ tar xf mosquitto-1.4.4.tar.gz -C /usr/local/src/
4.編譯准備
cd /usr/local/src/mosquitto-1.4.4/
vim compiling.txt #這個文件里有寫需要的依賴包，內容如下
The following packages are required for mosquitto:
* tcp-wrappers (optional, package name libwrap0-dev)
* openssl (version 1.0.0 or greater if TLS-PSK support is needed, can be disabled)
* c-ares (for DNS-SRV support, can be disabled)
* libuuid (from e2fsprogs, can be disabled)
* On Windows, the Redhat pthreads library is required if threading support is
to be included.
To compile, run "make", but also see the file config.mk for more details on the
various options that can be compiled in.
vim config.mk #這個文件里包含多個選項，可以選擇自己需要的功能
常見功能說明
WITH_SRV |
啟用c-areas庫，DNS查找的庫 |
missing ares.h |
WITH_UUID |
啟用lib-uuid為每個連接客戶端生成uuid |
missing uuid.h |
WITH_WEBSOCKET |
啟用WebSocket協議 |
missing libwebsockets.h |
5.安裝tcp-wrappers
因為本機已經有了，所以就不安裝了
rpm –qa | grep tcp_wrap*
tcp_wrappers-7.6-57.el6.x86_64
tcp_wrappers-libs-7.6-57.el6.x86_64
6.編譯安裝c-ares
cd /usr/local/src/c-ares-1.10.0 ./configure make make install
7.安裝libuuid
yum -y install libuuid libuuid-devel
8.安裝websocket
cd /usr/local/src/libwebsockets-1.3-chrome37-firefox30/
vim README.build #參照說明文檔內容編譯安裝即內容如下
Generate the build files (default is Make files):
cd /path/to/src
mkdir build
cd build
cmake ..
(NOTE: The build/ directory can have any name and be located anywhere
on your filesystem, and that the argument ".." given to cmake is simply
the source directory of libwebsockets containing the CMakeLists.txt
project file. All examples in this file assumes you use "..")
NOTE2
A common option you may want to give is to set the install path, same
as --prefix= with autotools. It defaults to /usr/local.
You can do this by, eg
cmake .. -DCMAKE_INSTALL_PREFIX:PATH=/usr #指定安裝路徑
NOTE3
On machines that want libraries in lib64, you can also add the
following to the cmake line
-DLIB_SUFFIX=64 #指定64位庫
NOTE4
If you are building against a non-distro OpenSSL (eg, in order to get
access to ALPN support only in newer OpenSSL versions) the nice way to
express that in one cmake command is eg,
-DOPENSSL_ROOT_DIR=/usr/local/ssl #指定ssl文件位置
mkdir build; cd build; cmake .. -DLIB_SUFFIX=64 make install
9.開始安裝mosquitto服務
cd /usr/local/src/mosquitto-1.4.4/ make && make install && echo $?
默認文件路徑
| /usr/local/sbin | mosquitto server |
| /etc/mosquitto | configure |
| /usr/local/bin | utility command |
10.修改鏈接庫
由於操作系統版本及架構原因，很容易出現安裝之后的鏈接庫無法被找到，如啟動mosquitto客戶端可能出現找不到libmosquitto.so.1文件，因此需要添加鏈接庫路徑
ln -s /usr/local/lib/libmosquitto.so.1 /usr/lib/libmosquitto.so.1
ldconfig
否則會出現注意的錯誤
error while loading shared libraries: libmosquitto.so.1: cannot open shared object file: No such file or directory
還有一些編譯時可能會遇到的錯誤
mosquitto.c:871: error: ‘struct mosquitto’ has no member named ‘achan’
如果不使用可以在config.mk 把WITH_SRV功能關閉即可
其他問題也差不多，基本就是缺少相應的依賴包，解決辦法兩個
1在config.mk關閉相關選項
2 把依賴包裝上
嫌麻煩可以直接yum install mosquitto mosquitto-clients –y一句話搞定上面所有
開始測試
1.添加組和用戶
groupadd mosquitto
useradd –g mosquitto mosquitto
2.啟用,備份和編輯配置文件
cp /etc/mosquitto/mosquitto.conf.example /etc/mosquitto/mosquitto.conf #配置文件如下
# 服務進程的PID
#pid_file /var/run/mosquitto.pid
# 服務進程的系統用戶
#user mosquitto
# 服務綁定的IP地址
#bind_address
# 服務綁定的端口號
#port 1883
# 允許的最大連接數，-1表示沒有限制
#max_connections -1
# 允許匿名用戶
#allow_anonymous true
可以參考官網說明http://mosquitto.org/man/mosquitto-conf-5.html
配置代理：
實驗測試：在本地開啟三個終端來代表發布者，服務代理，訂閱者。來模擬遠程測試
正常情況下：發布者 服務代理 訂閱者是分別是不同的host 也就是各自IP不同
所以若要測試遠程通信可以使用發布和訂閱命令時加上 -h 代理服務器的地址
先在服務代理終端上開啟mqtt服務
mosquitto -c /etc/mosquitto/mosquitto.conf –d
然后再打開一個終端訂閱主題，模擬訂閱者
mosquitto --help
mosquitto_sub -t goodafternoon #訂閱goodafternoon主題
這里如果報錯：
mosquitto_sub: error while loading shared libraries: libcares.so.2: cannot open shared object file: No such file or directory
原因：找不到libcares.so.2庫文件
vim /etc/ld.so.conf.d/qt-x86_64.conf
添加下面兩行
/usr/local/lib64
/usr/local/lib
ldconfig #刷新配置
然后再打開一個終端發布主題，模擬發布者
mosquitto_pub -t goodafternoon -m "hello world" #向goodaftnoon發布消息
可以在代理B端上看到連接日志
1494420735: New connection from ::1 on port 1883.
1494420735: New client connected from ::1 as mosqsub/23455-demon-cli (c1, k60).
1494420850: New connection from ::1 on port 1883.
1494420850: New client connected from ::1 as mosqpub/23456-demon-cli (c1, k60).
1494420850: Client mosqpub/23456-demon-cli disconnected.
而在訂閱A端可以收到hello world這條消息！！
本文實驗參考http://www.cnblogs.com/littleatp/p/4835879.html及一些大神的文章才得出的成功。感謝各位大神的努力和汗水。