Memcached是一套分布式的高速緩存系統(tǒng)，用于提升網(wǎng)站訪問速度，尤其對于一些大型的、需要頻繁訪問數(shù)據(jù)庫的網(wǎng)站，訪問速度提升效果十分顯著。

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1.安裝memcached
yum install memcached
yum install libmemcached
netstat -ntpl
systemctl status memcached
systemctl start memcached
netstat -ntupl

2.配置memcached只監(jiān)聽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 不啟用UDP監(jiān)聽

systemctl restart memcached
netstat -ntpl
systemctl status memcached

3.檢查memcached運(yùn)行，能看到很多信息
memstat --servers="127.0.0.1"

4.配置memcached啟用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.安裝cyrus SASL庫
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