memcached安装运行
1. 安装libevent
tar zxvf libevent-2.0.21-stable.tar.gz
cd libevent-2.0.21-stable
./configure
make
make install --用root用户，否则没权限
2：安装memcached
tar zxvf memcached-1.4.5.tar.gz
cd memcached-1.4.5.tar.gz
./configure --with-libevent=/usr
说明：configure 需要加 libevent的安装路径
make
make install --用root用户，否则没权限
安装完成后会把memcached放到 /usr/local/bin/memcached
libevent 的位置所以，请先使用whereis libevent 得到位置，然后连接到memcached 所寻找的路径
然后，再看memcached 从哪里找它
# LD_DEBUG=libs memcached -v 2>&1 > /dev/null | less
可以看到：是/usr/lib/libevent-2.0.so.5，所以，创建软链
ln -s /usr/local/lib/libevent-2.0.so.5 /usr/lib/libevent-2.0.so.5
memcached -d -m 1024 -u root -l 10.3.7.215 -p 11211 -c 256 -P /tmp/memcached.pid
-d 选项是启动一个守护进程，
-m 是分配给Memcache使用的内存数量，单位是MB，这里是1024MB
-u 是运行Memcache的用户，这里是root
-l 是监听的服务器IP地址，如果有多个地址的话，这里指定了服务器的IP地址10.3.7.215
-p 是设置Memcache监听的端口，这里设置了11211，最好是1024以上的端口
-c 选项是最大运行的并发连接数，默认是1024，这里设置了256，按照你服务器的负载量来设定
-P 是设置保存Memcache的pid文件
kill `cat /tmp/memcached.pid`
tar zxvf libevent-2.0.21-stable.tar.gz
cd libevent-2.0.21-stable
./configure
make
make install --用root用户，否则没权限
2：安装memcached
tar zxvf memcached-1.4.5.tar.gz
cd memcached-1.4.5.tar.gz
./configure --with-libevent=/usr
说明：configure 需要加 libevent的安装路径
make
make install --用root用户，否则没权限
安装完成后会把memcached放到 /usr/local/bin/memcached
[jifeng@jifeng04 ~]$ tar zxf memcached-1.4.20.tar.gz [jifeng@jifeng04 ~]$ cd memcached-1.4.20 [jifeng@jifeng04 memcached-1.4.20]$ ./configure --with-libevent=/usr checking build system type... x86_64-unknown-linux-gnu checking host system type... x86_64-unknown-linux-gnu checking target system type... x86_64-unknown-linux-gnu checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for style of include used by make... GNU checking dependency style of gcc... gcc3 checking how to run the C preprocessor... gcc -E checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for icc in use... no checking for clang in use... no checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking whether __SUNPRO_C is declared... no checking for gcc option to accept ISO C99... -std=gnu99 checking whether gcc -std=gnu99 and cc understand -c and -o together... yes checking sasl/sasl.h usability... no checking sasl/sasl.h presence... no checking for sasl/sasl.h... no checking for gcov... /usr/bin/gcov checking for main in -lgcov... yes checking for library containing clock_gettime... -lrt checking for library containing socket... none required checking for library containing gethostbyname... none required checking for libevent directory... /usr checking for library containing umem_cache_create... no checking for library containing gethugepagesizes... no checking for stdbool.h that conforms to C99... yes checking for _Bool... yes checking for inttypes.h... (cached) yes checking for sasl_callback_ft... no checking for print macros for integers (C99 section 7.8.1)... yes checking for an ANSI C-conforming const... yes checking for socklen_t... yes checking for endianness... little checking for htonll... no checking for library containing pthread_create... none required checking for mlockall... yes checking for getpagesizes... no checking for memcntl... no checking for sigignore... yes checking for clock_gettime... yes checking for accept4... yes checking for alignment... need checking for GCC atomics... yes checking for setppriv... no checking umem.h usability... no checking umem.h presence... no checking for umem.h... no checking for xml2rfc... no checking for xsltproc... no configure: creating ./config.status config.status: creating Makefile config.status: creating doc/Makefile config.status: creating config.h config.status: executing depfiles commands [jifeng@jifeng04 memcached-1.4.20]$make [root@jifeng04 memcached-1.4.20]$make install
启动时出现“memcached: error while loading shared libraries:libevent-2.0.so.5: cannot
open shared object file: No such file or directory”之类的信息，表示memcached 找不到libevent 的位置所以，请先使用whereis libevent 得到位置，然后连接到memcached 所寻找的路径
# whereis libevent
libevent: /usr/local/lib/libevent.la /usr/local/lib/libevent.so /usr/local/lib/libevent.a
然后，再看memcached 从哪里找它
# LD_DEBUG=libs memcached -v 2>&1 > /dev/null | less
可以看到：是/usr/lib/libevent-2.0.so.5，所以，创建软链
ln -s /usr/local/lib/libevent-2.0.so.5 /usr/lib/libevent-2.0.so.5
[jifeng@jifeng04 memcached-1.4.20]$ ln -s /usr/local/lib/libevent-2.0.so.5 /usr/lib/libevent-2.0.so.5 ln: 创建符号链接 "/usr/lib/libevent-2.0.so.5": 权限不够 [jifeng@jifeng04 memcached-1.4.20]$ su - 密码： [root@jifeng04 ~]# ln -s /usr/local/lib/libevent-2.0.so.5 /usr/lib/libevent-2.0.so.5 [root@jifeng04 ~]# exit logout
3:启动memcached
[jifeng@jifeng04 memcached-1.4.20]$ /usr/local/bin/memcached -d -m 1024 -l 10.3.7.215 -p 11211 [jifeng@jifeng04 memcached-1.4.20]$
memcached基本选项
-d 选项是启动一个守护进程，
-m 是分配给Memcache使用的内存数量，单位是MB，这里是1024MB
-u 是运行Memcache的用户，这里是root
-l 是监听的服务器IP地址，如果有多个地址的话，这里指定了服务器的IP地址10.3.7.215
-p 是设置Memcache监听的端口，这里设置了11211，最好是1024以上的端口
-c 选项是最大运行的并发连接数，默认是1024，这里设置了256，按照你服务器的负载量来设定
-P 是设置保存Memcache的pid文件
kill `cat /tmp/memcached.pid`
检查memcached是否正常运行
#ps aux | grep memcached
#telnet localhost 11211
....
echo stats | nc 10.3.7.215 11211
会显示memcached的基本信息
[jifeng@jifeng03 ~]$ echo stats | nc 10.3.7.215 11211 STAT pid 14279 STAT uptime 79957 STAT time 1407767792 STAT version 1.4.20 STAT libevent 2.0.21-stable STAT pointer_size 64 STAT rusage_user 1.392788 STAT rusage_system 0.910861 STAT curr_connections 5 STAT total_connections 7 STAT connection_structures 6 STAT reserved_fds 20 STAT cmd_get 2 STAT cmd_set 0 STAT cmd_flush 0 STAT cmd_touch 0 STAT get_hits 0 STAT get_misses 2 STAT delete_misses 0 STAT delete_hits 0 STAT incr_misses 0 STAT incr_hits 0 STAT decr_misses 0 STAT decr_hits 0 STAT cas_misses 0 STAT cas_hits 0 STAT cas_badval 0 STAT touch_hits 0 STAT touch_misses 0 STAT auth_cmds 0 STAT auth_errors 0 STAT bytes_read 22 STAT bytes_written 10 STAT limit_maxbytes 1073741824 STAT accepting_conns 1 STAT listen_disabled_num 0 STAT threads 4 STAT conn_yields 0 STAT hash_power_level 16 STAT hash_bytes 524288 STAT hash_is_expanding 0 STAT malloc_fails 0 STAT bytes 0 STAT curr_items 0 STAT total_items 0 STAT expired_unfetched 0 STAT evicted_unfetched 0 STAT evictions 0 STAT reclaimed 0 STAT crawler_reclaimed 0 END