https://blog.csdn.net/fengaodlw/article/details/79221526

搭建步骤如下：

1、安装依赖包 
yum -y install gcc gcc-c++ openssl-devel c-ares-devel libuuid-devel wget cmake

2、安装libwebsockets(mosquitto支持websocket) 
命令如下： 
cd /mnt/ 
git clone https://git.oschina.net/woniu201/libwebsockets.git 
cd libwebsockets/ 
tar zxfv libwebsockets-v1.5-stable.tar.gz 
cd libwebsockets-v1.5-stable 
mkdir build 
cd build/ 
cmake .. 
make && make install

3、安装mosquitto 
wget http://mosquitto.org/files/source/mosquitto-1.4.8.tar.gz 
tar zxfv mosquitto-1.4.8.tar.gz 
cd mosquitto-1.4.8 
vi config.mk 
WITH_WEBSOCKETS:=no 改为yes

make && make install 
ln -s /usr/local/lib/libwebsockets.so.6 /usr/lib64/libwebsockets.so.6 
groupadd mosquitto 
useradd -g mosquitto mosquitto 
cd /etc/mosquitto/ 
创建mosquitto.conf、pwfile文件 
# cp mosquitto.conf.example mosquitto.conf 
# cp pwfile.example pwfile 
修改 文件mosquitto.conf 
 
并在最后添加： 
port 1883 
listener 9109 
protocol websockets

4、启动 
mosquitto -d -c /etc/mosquitto/mosquitto.conf

报错：mosquitto: error while loading shared libraries: libwebsockets.so.5: cannot open shared object file: No such file or directory 
处理方法： 
[root@Docker mosquitto]# cat /etc/ld.so.conf 
include ld.so.conf.d/*.conf 
[root@Docker mosquitto]# echo “/usr/local/lib”>>/etc/ld.so.conf 
[root@Docker mosquitto]# ldconfig

5、测试 
开两个窗口 
mosquitto_sub -t mqtt (订阅) 
mosquitto_pub -h localhost -t mqtt -m “hello world”(发送消息)

# -c是指定一个配置文件 # -d作为守护进程 # -p是指定端口，默认1883 
# -v详细日志输出

6、设置密码 
a、修改/etc/mosquitto/mosquitto.conf 
allow_anonymous false 
b、新建用户 
mosquitto_passwd -c /etc/mosquitto/pwfile test 
c、测试命令 
mosquitto_sub -t mqtt -u test -P t123456 
mosquitto_pub -h localhost -t mqtt -m “hello world” -u test -P t123456

搭建支持websocket，主要是小程序的开发中需要用到此技术点。此篇文章主要是现实了第一步，下一篇文章会介绍小程序中使用websocket协议连接mqtt服务器。

参考资料： 
http://blog.csdn.net/u011033736/article/details/53218394 
http://blog.csdn.net/u012377333/article/details/69397124
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作者：鱼天翱 
来源：CSDN 
原文：https://blog.csdn.net/fengaodlw/article/details/79221526 
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