centos7安装mosquitto并支持websocket
1、下载 mosquitto 和 libwebsockets
https://github.com/eclipse/mosquitto/archive/v1.5.1.tar.gz
https://github.com/warmcat/libwebsockets/archive/v1.5-chrome47-firefox41.tar.gz
2、安装编译工具 gcc和g++
yum install gcc-c++3、安装mosquitto 编译所需的依赖库
yum install openssl-devel
yum install c-ares-devel
yum install libuuid-devel
yum install e2fsprogs-devel
yum install uuid-devel
4、安装cmake（在安装libwebsockets 的时候需要用到）
yum install cmake5、解压、编译、安装libwebsockets
tar zxvf libwebsockets-1.5-chrome47-firefox41.tar.gz
cd libwebsockets-1.5-chrome47-firefox41
mkdir build
cd build
cmake ..
make
make install6、解压、修改mosquitto 的配置config.mk使之支持websocket（默认不支持websocket）
tar zxvf mosquitto-1.5.1.tar.gz
cd mosquitto-1.5.1
//将config.mk 的WITH_WEBSOCKETS:=NO 修改 为 WTIH_WEBSOCKETS:=yes
vim config.mk
7、编译、安装mosquitto
make
make install（1）编译安装过程中可能会报这个错
make[1]: 进入目录“/home/jason/mosquitto-1.2/man”
xsltproc mosquitto.8.xml
warning: failed to load external entity "/usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl"
compilation error: file manpage.xsl line 3 element import
xsl:import : unable to load /usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl
compilation error: file mosquitto.8.xml line 4 element refentry
xsltParseStylesheetProcess : document is not a stylesheet
make[1]: *** [mosquitto.8] 错误 5make[1]:
离开目录“/home/jason/mosquitto-1.2/man”
make: *** [docs] 错误 2这个因为找不到这个文件/usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl
，所以需要安装docbook-style-xsl。
yum -y install docbook-style-xsl（2） 查看docbook-style-xsl的安装位置
find / -name docbook.xsl发现docbook.xsl是在安装在这里
/usr/share/sgml/docbook/xsl-stylesheets-1.78.1/manpages/docbook.xsl
（3）进入到mosquitto-1.5.1/man的目录，编辑manpage.xsl文件
cd mosquitto-1.5.1/man
vim manpage.xsl （4）将红色边框圈中的原始路径修改为
/usr/share/sgml/docbook/xsl-stylesheets-1.78.1/manpages/docbook.xsl
此时再执行make && make install 即可成功编译、安装。
8、修改mosquitto的配置文件
cd /etc/mosquitto
cp mosquitto.conf.example mosquitto.conf
vim mosquitto.conf在Default listener 这里添加
port 1883
listener 9001
protocol websockets
这里的port 和 listener 都可以自定义，只要没有端口冲突即可。
修改之后保存并退出。
9、添加mosquitto用户，启动mosquitto服务
adduser mosquitto
//mosquitto -c /etc/mosquitto/mosquitto.conf 前台启动方式
mosquitto -c /etc/mosquitto/mosquitto.conf -d //后台启动方式（推荐）启动时如果报如下错误：
是因为没有找到安装的libwebsockets库，执行如下软链接命令：
ln -s /usr/local/lib/libwebsockets.so.5 /usr/lib64/libwebsockets.so.5然后关闭mosquitto，再重启
//首先查看mosquitto 的进程id,然后使用kill 命令指定进程id 即可停止mosquitto服务
//例如我这里的进程id是9307
ps -ef | grep mos
kill -9 9307
mosquitto -c /etc/mosquitto/mosquitto.conf -d
ss -tupln | grep 9001 //查看 9001 websocket 端口是否可以监听到10、关闭防火墙
systemctl stop firewalld.service
systemctl disable firewalld11、至此便可以编写websocket客户端连接mosquitto服务并成功发布/订阅消息。
参考博客：
https://www.2cto.com/kf/201701/592690.html
https://blog.csdn.net/qq_28877125/article/details/78826550
https://www.cnblogs.com/mao2080/p/7772882.html
https://www.cnblogs.com/smartvessel/archive/2011/01/21/1940868.html
https://blog.csdn.net/houjixin/article/details/46711547
https://www.cnblogs.com/littleatp/p/4835879.html
https://blog.csdn.net/furzoom/article/details/49818333
https://www.cnblogs.com/chen1-kerr/p/7258487.html
https://blog.csdn.net/u012703795/article/details/50388872
https://blog.csdn.net/houjixin/article/details/46711547
https://www.cnblogs.com/djrLog/p/5590245.html
https://blog.csdn.net/xj178926426/article/details/78832296
https://blog.csdn.net/itzaibadong/article/details/49449995
https://blog.csdn.net/lifan1314521/article/details/50402628