SASL全称Simple Authentication and Security Layer，是一种用来扩充C/S模式验证能力的机制
1.yum安装cyrus-sasl
yum -y install cyrus-sasl-devel.x86_64 cyrus-sasl.x86_64 cyrus-sasl-lib.x86_64 cyrus-sasl-plain.x86_64
查看安装结果：
2.sasl相关文件
https://blog.csdn.net/qwssd/article/details/77198839
3.启动saslauthd进程
/etc/init.d/saslauthd start
4.验证saslauth启动是否成功
5.添加用户“memcached”给“memcached”程序
saslpasswd2 -a memcached -c memcached
6.查看是否添加成功
7.安装libevent
wget https://github.com/libevent/libevent/releases/download/release-2.0.22-stable/libevent-2.0.22-stable.tar.gz
8.解压安装
tar zxvf libevent-2.0.22-stable.tar.gz
cd libevent-2.0.22-stable
./configure --prefix=/usr/local/libevent
make && make install
9.查看是否安装成功
ls -al /usr/lib | grep libevent
10.安装memcached(memcached在1.4.3版本之后才支持sasl)
wget http://www.memcached.org/files/memcached-1.5.9.tar.gz
tar zxvf memcached-1.5.9.tar.gz
./configure --enable-sasl --prefix=/usr/local/memcached --with-libevent=/usr/local/libevent
make && make install
./configure --enable-sasl --prefix=/usr/local/memcached --with-libevent=/usr/local/libevent
11.mc启动
解决“can't find the user memcached to switch to”问题
解决“Error initializing sasl.”问题，改为安装memcached-1.5.0
12.验证
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参考：
Linux下安装配置带SASL认证的Memcached
https://blog.csdn.net/qwssd/article/details/77198839
centos安装memcached 并开启sasl认证
http://www.7kb.org/957.html
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