关闭CentOS7的防火墙
- 停止防火墙服务
sudo systemctl stop firewalld.service
- Centos启动时不启用防火墙
sudo systemctl disable firewalld.service
安装Telnet服务器和客户端
- 安装xinetd(Telnet服务器依赖于xinetd的运行)
yum install xinetd
- 安装telnet服务器和客户端
检查telnet的可用安装包
yum list telnet*
然后分别执行如下两个命令完成安装服务器端和客户端,完成后就可以在Centos中使用telnet客户端了
yum install telnet-server yum install telnet
Centos7安装Memcached
- 安装libevent
wget http://monkey.org/~provos/libevent-1.4.14b-stable.tar.gz tar zxvf libevent-1.4.14b-stable.tar.gz cd libevent-1.4.14b-stable ./configure --prefix=/usr/local/libevent/ make make install
- 安装Memcached
wget http://www.memcached.org/files/memcached-1.4.21.tar.gz tar zxvf memcached-1.4.21.tar.gz cd memcached-1.4.21 ./configure --prefix=/usr/local/memcached/ --with-libevent=/usr/local/libevent/ make make install
- 启动Memcached
/usr/local/memcached/bin/memcached -d -m 64 -u hadoop -l 127.0.0.100 -p 11211 -c 96 -P /tmp/memcached.pid
- 启动Memcached的命令参数
Memcached缓存数据增删改查
- Memcached初次启动时,活动的slabs和分配的内存均为0
stats items END stats slabs STAT active_slabs 0 STAT total_malloced 0 END
- 插入一条数据
set name 0 0 2 ab STORED get name VALUE name 0 2 ab END
- 再次查看stats slabs 和stats items
stats slabs STAT 1:chunk_size 96 STAT 1:chunks_per_page 10922 STAT 1:total_pages 1 STAT 1:total_chunks 10922 STAT 1:used_chunks 1 STAT 1:free_chunks 10921 STAT 1:free_chunks_end 0 STAT 1:mem_requested 71 STAT 1:get_hits 1 STAT 1:cmd_set 1 STAT 1:delete_hits 0 STAT 1:incr_hits 0 STAT 1:decr_hits 0 STAT 1:cas_hits 0 STAT 1:cas_badval 0 STAT 1:touch_hits 0 STAT active_slabs 1 STAT total_malloced 1048512 END stats items STAT items:1:number 1 STAT items:1:age 190 STAT items:1:evicted 0 STAT items:1:evicted_nonzero 0 STAT items:1:evicted_time 0 STAT items:1:outofmemory 0 STAT items:1:tailrepairs 0 STAT items:1:reclaimed 0 STAT items:1:expired_unfetched 0 STAT items:1:evicted_unfetched 0 STAT items:1:crawler_reclaimed 0 STAT items:1:lrutail_reflocked 0 END