因?yàn)槲覀児疽恢痹谟胢emcache,始終存在幾個(gè)問題，問題如下：1、單點(diǎn)問題；2、緩存無備份和緩存無法同步問題。
針對(duì)以上問題給出具體的解決方案：
1、用magent，做集群和分布式。。
用magent，做集群和分布式。。
magent-0.5.tar.gz
libevent-1.4.14b-stable.tar.gz
memcached-1.4.25.tar.gz
memcached 的安裝和依賴安裝
1. 安裝libevent
tar zxvf libevent-1.4.13-stable.tar.gz
cd libevent-1.4.13-stable
./configure --prefix=/usr/local/libevent-1.4.14
make
make install
2. 安裝memcached
tar zxvf memcached-1.4.5.tar.gz
cd memcached-1.4.5.tar.gz
./configure --with-libevent=/usr/local/libevent-1.4.14 ## configure 需要加 libevent的安裝路徑世紀(jì)安裝路徑 或者在當(dāng)前路徑下用yum install libevent來安裝
make
make install
安裝完成后配置路徑
/usr/bin/install -c 'memcached' '/usr/local/bin/memcached' 配置memcached的路徑
/usr/bin/install -c 'memcached-debug''/usr/local/bin/memcached-debug' 配置memcached-debug的路徑
安裝magent
mkdir magent
tar zxvfmagent-0.5.tar.gz -C magent
/sbin/ldconfig
sed -i "s#LIBS =-levent#LIBS = -levent -lm#g" Makefile
make
cp magent/usr/local/bin/magent
cd ../
/usr/local/bin/memcached -d -u kssadmin -p 11211
/usr/local/bin/memcached -d -u kssadmin -p 11212
/usr/local/bin/memcached -d -u kssadmin -p 11213
/usr/local/bin/magent-u root -d -l 192.168.20.122 -p 12000 -s 127.0.0.1:11211 -s127.0.0.1:11212 -b 127.0.0.1:11213
分別在127.0.0.1機(jī)器的11211，11212,11213端口啟動(dòng)3個(gè)Memcached進(jìn)程，在12000端口開啟magent代理程序
11211和11212為主Memcached，11213為備份Memcached；
2、 用repcache 主備來解決緩存?zhèn)浞莺途彺嫱絾栴}
memcached-1.2.8-repcached-2.2.tar
repcached下載地址：http://downloads.sourceforge.net/repcached
參考網(wǎng)上的例子自己安裝repcache，安裝過程中遇到各種問題一一解決并做了整理，并分享出來；首先感謝前人整理分享的資料，其次希望該資料給其他人帶來方便。
具體代碼：
# cd /home/kssadmin 進(jìn)入到當(dāng)前用戶的主目錄
#mkdir app 創(chuàng)建app
# mv /home/kssadmin/Desktop/ /home/kssadmin/app/ centos實(shí)在VM環(huán)境下搭建的，我從外部下載的安裝包，并拷貝到Desktop中，移動(dòng)到app下
#cd /home/kssadmin/app/
#ll
-rwxrwxrwx. 1 kssadmin kssadmin 227510 Jul 1 2014 memcached-1.2.8-repcached-2.2.tar.gz
準(zhǔn)備工作已完成
#tar -zxvf memcached-1.2.8-repcached-2.2.tar.gz 解壓縮
# cd memcached-1.2.8-repcached-2.2/
# yum install libevent-devel //用yum方式安裝的libevent-devel 如果提示Another app is currently holding the yum lock; waiting for it to exit... 請(qǐng)參考后面解決方案
Loaded plugins: fastestmirror, langpacks
base | 3.6 kB 00:00
extras | 3.4 kB 00:00
jenkins | 951 B 00:00
updates | 3.4 kB 00:00
extras/7/x86_64/primary_db | 101 kB 00:00
jenkins/primary | 35 kB 00:01
Loading mirror speeds from cached hostfile
* base: mirror.bit.edu.cn
* extras: mirrors.neusoft.edu.cn
* updates: mirror.bit.edu.cn
jenkins 321/321
Resolving Dependencies
--> Running transaction check
---> Package libevent-devel.x86_64 0:2.0.21-4.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
libevent-devel x86_64 2.0.21-4.el7 base 85 k
Transaction Summary
================================================================================
Install 1 Package
Total download size: 85 k
Installed size: 357 k
Is this ok [y/d/N]: y
Downloading packages:
warning: /var/cache/yum/x86_64/7/base/packages/libevent-devel-2.0.21-4.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Public key for libevent-devel-2.0.21-4.el7.x86_64.rpm is not installed
libevent-devel-2.0.21-4.el7.x86_64.rpm | 85 kB 00:03
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Importing GPG key 0xF4A80EB5:
Userid : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>"
Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
Package : centos-release-7-1.1503.el7.centos.2.8.x86_64 (@anaconda)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : libevent-devel-2.0.21-4.el7.x86_64 1/1
Verifying : libevent-devel-2.0.21-4.el7.x86_64 1/1
Installed:
libevent-devel.x86_64 0:2.0.21-4.el7
Complete! -----到此libebvent-devel 安裝成功
# ./configure --enable-replication --program-transform-name=s/memcached/repcached/ 配置和生成makefle 文件
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... /usr/bin/mkdir -p
..................
#make
###make過程中如果約到一下問題：請(qǐng)參考后面解決方案,親自解決過了 貼出來跟大家分享一下。。
ed.c: In function ‘a(chǎn)dd_iov’:
memcached.c:696:30: error: ‘IOV_MAX’ undeclared (first use in this function)
if (m->msg_iovlen == IOV_MAX ||
^
memcached.c:696:30: note: each undeclared identifier is reported only once for each function it appears in
.....
# make install
......
到此安裝完成，下面完成配置：
# /usr/bin/install -c 'memcached' '/usr/local/bin/repcached' 正常模式啟動(dòng)
# /usr/bin/install -c 'memcached-debug' '/usr/local/bin/repcached-debug' debug模式啟動(dòng)
[kssadmin
@localhost memcached-1.2.8-repcached-2.2]$ /usr/local/bin/repcached -p 11211 -v -d ######啟動(dòng) 占用端口 -p（-p <num> TCP port number to listen on (default: 11211)）指定端口 11211 -v (verbose (print errors/warnings while in event loop)) 打印錯(cuò)誤信息和警告 -d 以守護(hù)進(jìn)程方式啟動(dòng) (run as a daemon )
replication: listen ## 顯示當(dāng)前信息證明啟動(dòng)成功
[kssadmin
@localhost memcached-1.2.8-repcached-2.2]$ ps -ef|grep repchache ### 查看repchache 是否啟動(dòng)
kssadmin 3385 1 0 09:31 ? 00:00:01 /usr/bin/ibus-daemon --replace --xim --panel disable
kssadmin 9613 1 0 09:49 ? 00:00:00 /usr/local/bin/repcached -p 11211 -v -d
kssadmin 9683 3821 0 09:50 pts/0 00:00:00 grep --color=auto rep
/usr/local/bin/repcached -p 11212 -x 127.0.0.1 -v -d 啟動(dòng)備份
replication: connect (peer=127.0.0.1:11212)
replication: marugoto copying
replication: accept
[kssadmin
@localhost memcached-1.2.8-repcached-2.2]$ replication: start
[kssadmin@localhost memcached-1.2.8-repcached-2.2]$ ps -aux
。。。
kssadmin 9613 0.0 0.0 9564 776 ? Ss 09:49 0:00 /usr/local/bin/repcached -p 11211 -v -d
kssadmin 9708 0.0 0.0 9516 580 ? Ss 09:50 0:00 /usr/local/bin/repcached -p 11212 -x 127.0.0.1 -v -d
。。。。
repcache啟動(dòng)成功
測(cè)試數(shù)據(jù)是否同步 首先telnet 11211 并寫入數(shù)據(jù)
[root@localhost Packages]# telnet localhost 11211
Trying ::1...
Connected to localhost.
Escape character is '^]'.
set seven 0 0 8 注意：最后一位給出的是字符穿個(gè)數(shù)，輸入的字符串位數(shù)必須夠，否則會(huì)爆出錯(cuò)誤：CLIENT_ERROR bad data chunk 這是因?yàn)榇鎯?chǔ)的字節(jié)長(zhǎng)度與指定的長(zhǎng)度不匹配造成的
dddddddd
STORED
get seven
VALUE seven 0 8
dddddddd
END
quit
Connection closed by foreign host.
[root@localhost Packages]# telnet localhost 11212 -- 在備份的cache中取數(shù)據(jù)
Trying ::1...
Connected to localhost.
Escape character is '^]'.
get seven
VALUE seven 0 8
dddddddd
END
其次測(cè)試在備分緩存集成中寫入數(shù)據(jù)是否會(huì)同步到主緩存中
[root@localhost Packages]# telnet localhost 11212
Trying ::1...
Connected to localhost.
Escape character is '^]'.
set back 0 0 6
------
STORED
get back
VALUE back 0 6
------
END
quit
Connection closed by foreign host.
[root@localhost Packages]# telnet localhost 11211
Trying ::1...
Connected to localhost.
Escape character is '^]'.
get back
VALUE back 0 6
------
END
quit
Connection closed by foreign host.
# yum install libevent-devel //用yum方式安裝的libevent-devel
安裝過過程中一直遇到如下問題，提示app被鎖了，另外京城在占用這，如果遇到了可以選擇殺掉 的進(jìn)程或者直接結(jié)束上一次操作直接執(zhí)行 rm -f /var/run/yum.pid
Loaded plugins: fastestmirror, langpacks
Existing lock /var/run/yum.pid: another copy is running as pid 4497.
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: PackageKit
Memory : 132 M RSS (1.4 GB VSZ)
Started: Wed Feb 24 09:34:01 2016 - 04:48 ago
State : Sleeping, pid: 4497
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: PackageKit
Memory : 132 M RSS (1.4 GB VSZ)
Started: Wed Feb 24 09:34:01 2016 - 04:50 ago
State : Sleeping, pid: 4497
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: PackageKit
Memory : 132 M RSS (1.4 GB VSZ)
Started: Wed Feb 24 09:34:01 2016 - 04:52 ago
State : Sleeping, pid: 4497
#make
make && make install
提示編譯出錯(cuò)：
make all-recursive
make[1]: Entering directory `/usr/local/memcached'
Making all in doc
make[2]: Entering directory `/usr/local/memcached/doc'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/usr/local/memcached/doc'
make[2]: Entering directory `/usr/local/memcached'
gcc -DHAVE_CONFIG_H -I. -DNDEBUG -m64 -g -O2 -MT memcached-memcached.o -MD
MP -MF .deps/memcached-memcached.Tpo -c -o memcached-memcached.o `test -f
memcached.c' || echo './'`memcached.c
memcached.c: In function ‘a(chǎn)dd_iov’:
memcached.c:697: error: ‘IOV_MAX’ undeclared (first use in this function)
memcached.c:697: error: (Each undeclared identifier is reported only once
memcached.c:697: error: for each function it appears in.)
make[2]: *** [memcached-memcached.o] Error 1
make[2]: Leaving directory `/usr/local/memcached'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/local/memcached'
make: *** [all] Error 2
解決方案：
vi memcached.c
將下面的幾行
/* FreeBSD 4.x doesn't have IOV_MAX exposed. */
#ifndef IOV_MAX
#if defined(__FreeBSD__) || defined(__APPLE__)
# define IOV_MAX 1024
#endif
#endif
修改為
/* FreeBSD 4.x doesn't have IOV_MAX exposed. */
#ifndef IOV_MAX
# define IOV_MAX 1024
#endif
重新編譯和安裝：
make && make install
