Mqtt服务器搭建

测试环境:CentOS64位

1.安装基础软件

yum install gcc-c++

yum install cmake

yum install openssl-devel  //mosquitto默认支持openssl

2.下载源码包

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.解压源码包

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.编译准备

cd /usr/local/src/mosquitto-1.4.4/

vim compiling.txt #这个文件里有写需要的依赖包，内容如下

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 #这个文件里包含多个选项，可以选择自己需要的功能

常见功能说明

WITH_SRV	启用c-areas库，DNS查找的库	missing ares.h
WITH_UUID	启用lib-uuid为每个连接客户端生成uuid	missing uuid.h
WITH_WEBSOCKET	启用WebSocket协议	missing libwebsockets.h

5.安装tcp-wrappers

因为本机已经有了，所以就不安装了

rpm –qa | grep tcp_wrap*

tcp_wrappers-7.6-57.el6.x86_64

tcp_wrappers-libs-7.6-57.el6.x86_64

6.编译安装c-ares

cd  /usr/local/src/c-ares-1.10.0

./configure

make

make install

7.安装libuuid

yum -y install libuuid libuuid-devel

8.安装websocket

cd /usr/local/src/libwebsockets-1.3-chrome37-firefox30/vim README.build  #参照说明文档内容编译安装即内容如下

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　　#指定安装路径

NOTE3

On machines that want libraries in lib64, you can also add the

following to the cmake line

-DLIB_SUFFIX=64　　　　　　　　　　　　　　　　　　#指定64位库

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.开始安装mosquitto服务

cd /usr/local/src/mosquitto-1.4.4/

make && make install && echo $?

默认文件路径

/usr/local/sbin	mosquitto server
/etc/mosquitto	configure
/usr/local/bin	utility command

10.修改链接库

由于操作系统版本及架构原因，很容易出现安装之后的链接库无法被找到，如启动mosquitto客户端可能出现找不到libmosquitto.so.1文件，因此需要添加链接库路径

ln -s /usr/local/lib/libmosquitto.so.1 /usr/lib/libmosquitto.so.1

ldconfig

否则会出现注意的错误

error while loading shared libraries: libmosquitto.so.1: cannot open shared object file: No such file or directory

还有一些编译时可能会遇到的错误

mosquitto.c:871: error: ‘struct mosquitto’ has no member named ‘achan’

如果不使用可以在config.mk 把WITH_SRV功能关闭即可

其他问题也差不多，基本就是缺少相应的依赖包，解决办法两个

1在config.mk关闭相关选项

2 把依赖包装上

嫌麻烦可以直接yum install mosquitto mosquitto-clients –y一句话搞定上面所有

开始测试

1.添加组和用户

groupadd mosquitto

useradd –g mosquitto mosquitto

2.启用,备份和编辑配置文件

cp /etc/mosquitto/mosquitto.conf.example /etc/mosquitto/mosquitto.conf  #配置文件如下

# 服务进程的PID

#pid_file /var/run/mosquitto.pid

# 服务进程的系统用户

#user mosquitto

# 服务绑定的IP地址

#bind_address

# 服务绑定的端口号

#port 1883

# 允许的最大连接数，-1表示没有限制

#max_connections -1

# 允许匿名用户

#allow_anonymous true

可以参考官网说明http://mosquitto.org/man/mosquitto-conf-5.html

配置代理：

实验测试：在本地开启三个终端来代表发布者，服务代理，订阅者。来模拟远程测试

正常情况下：发布者服务代理订阅者是分别是不同的host 也就是各自IP不同

所以若要测试远程通信可以使用发布和订阅命令时加上 -h 代理服务器的地址

先在服务代理终端上开启mqtt服务

mosquitto -c /etc/mosquitto/mosquitto.conf –d

然后再打开一个终端订阅主题，模拟订阅者

mosquitto --help

mosquitto_sub -t goodafternoon   #订阅goodafternoon主题

这里如果报错：

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库文件

vim /etc/ld.so.conf.d/qt-x86_64.conf

添加下面两行

/usr/local/lib64

/usr/local/lib

ldconfig  #刷新配置

然后再打开一个终端发布主题，模拟发布者

mosquitto_pub -t goodafternoon -m "hello world"  #向goodaftnoon发布消息

可以在代理B端上看到连接日志

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.

而在订阅A端可以收到hello world这条消息！！

本文实验参考http://www.cnblogs.com/littleatp/p/4835879.html及一些大神的文章才得出的成功。感谢各位大神的努力和汗水。

来源：https://www.cnblogs.com/demonxian3/p/6835405.html

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mqtt服务器搭建

mqtt协议

mosquitto

make

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