Ubuntu16.04环境下libmemcached客户端安装

一. 安装

1. 下载libmemcached，当前最新版本：libmemcached-1.0.18.tar.gz，官网：https://launchpad.net/libmemcached/

wget https://launchpad.net/libmemcached/1.0/1.0.18/+download/libmemcached-1.0.18.tar.gz

2. 解压libmemcached-1.0.18.tar.gz

tar -xvf libmemcached-1.0.18.tar.gz

3. 进入目录libmemcached-1.0.18

cd libmemcached-1.0.18

4. 配置、编译、安装

./configure
make
sudo make install

二. 测试Demo

2.1 分别执行如下命令，启动3个memcached服务器端

memcached -p 11211 -m 64M -u root -v
memcached -p 11212 -m 64M -u root -v
memcached -p 11213 -m 64M -u root -v

 

2.2 客户端测试测代码：memcached_client.c

 

#include <libmemcached/memcached.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>

#define TOTAL_NUM	10000

int main(int argc, char **argv){

	//配置
	memcached_st *memc = NULL;
	memcached_return rc = 0;
	memcached_server_st *servers;		//服务器列表
	
	memc = memcached_create(NULL);
	
	servers = memcached_server_list_append(NULL, (char *)"127.0.0.1",11211, &rc);
	servers = memcached_server_list_append(servers, (char *)"127.0.0.1",11212, &rc);
	servers = memcached_server_list_append(servers, (char *)"127.0.0.1",11213, &rc);
	
	rc = memcached_server_push(memc, servers);
	
	memcached_behavior_set(memc, MEMCACHED_BEHAVIOR_DISTRIBUTION, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA);
	
	//写入
	char key[16];
	size_t key_len = 0;
	int i =0;
	for(i = 0; i < TOTAL_NUM; i++){
		key_len = snprintf(key, 16, "key%d", i);
		//key-value
		rc = memcached_set(memc, key, key_len, key, key_len, (time_t)1800, (uint32_t)0);		
	
		if(rc == MEMCACHED_SUCCESS){
			static int no;
			if((no++ % 1000) == 0) printf("key:%s value:%s\n", key, key);			
		}else{
			printf("set key(%s) failed, reason:%s\n", key, memcached_strerror(memc, rc));	
		}
	}
	
	//读取
	char *result_str = NULL;
	size_t result_str_len = 0;
	uint32_t flags;
	
	for(i = 0; i < TOTAL_NUM; i++){
		key_len = snprintf(key, 16, "key%d", i);
		result_str = memcached_get(memc, key, key_len, &result_str_len, &flags, &rc);
		
		if(rc == MEMCACHED_SUCCESS){
			static int num;
			if((num++ % 1000) == 0) printf("key:%s value:%s\n", key, result_str);		
		}else{
			fprintf(stderr, "get key %s failed.\n", key);
		}
	}
	
	memcached_free(memc);
	
	return 0;
}

 

2.3 编译

 

gcc memcached_client.c -o memcached_client -lmemcached

2.4 运行

./memcached_client

2.5 结果输出，测试成功。

key:key0 value:key0
key:key1000 value:key1000
key:key2000 value:key2000
key:key3000 value:key3000
key:key4000 value:key4000
key:key5000 value:key5000
key:key6000 value:key6000
key:key7000 value:key7000
key:key8000 value:key8000
key:key9000 value:key9000
key:key0 value:key0
key:key1000 value:key1000
key:key2000 value:key2000
key:key3000 value:key3000
key:key4000 value:key4000
key:key5000 value:key5000
key:key6000 value:key6000
key:key7000 value:key7000
key:key8000 value:key8000
key:key9000 value:key9000

三. 安装及运行问题解决

3.1 error while loading shared libraries: libmemcached.so.11: cannot open shared object file: No such file or directory

解决方法：libmemcached.so.11在目录/usr/local/lib下面，因为程序运行过程不会检索/usr/local/lib目录下的so文件，执行如下命令，将/usr/local/lib/libmemcached.so.11 链接到 /usr/lib/libmemcached.so.11

ln -s /usr/local/lib/libmemcached.so.11 /usr/lib/libmemcached.so.11