Memcached是一套分布式的高速缓存系统，用于提升网站访问速度，尤其对于一些大型的、需要频繁访问数据库的网站，访问速度提升效果十分显著。
1.安装memcached yum install memcached yum install libmemcached netstat -ntpl systemctl status memcached systemctl start memcached netstat -ntupl
2.配置memcached只监听127.0.0.1 vim /etc/sysconfig/memcached PORT="11211" USER="memcached" MAXCONN="1024" CACHESIZE="64" OPTIONS="-l 127.0.0.1 -U 0“ # -U 0 不启用UDP监听
systemctl restart memcached netstat -ntpl systemctl status memcached
3.检查memcached运行，能看到很多信息 memstat --servers="127.0.0.1"
4.配置memcached启用sasl vim /etc/sysconfig/memcached PORT="11211" USER="memcached" MAXCONN="1024" CACHESIZE="64" OPTIONS="-l 127.0.0.1 -U 0 -S -vv"
systemctl restart memcached netstat -ntpl memstat --servers="127.0.0.1" echo $?
5.安装cyrus SASL库 yum install cyrus-sasl-devel cyrus-sasl-plain
6.配置sasl vim /etc/sasl2/memcached.conf mech_list: plain log_level: 5 sasldb_path: /etc/sasl2/memcached-sasldb2
cat /etc/sasl2/memcached.conf saslpasswd2 -a memcached -c -f /etc/sasl2/memcached-sasldb2 zeng chown memcached:memcached /etc/sasl2/memcached-sasldb2 systemctl restart memcached netstat -ntpl memstat --servers="127.0.0.1" echo $? memstat --servers="127.0.0.1" --username=zeng --password=redhat
