測驗工程師必知必會-Redis

大家好，我是Tester1991,一枚普通測驗工程師，熱愛生活，熱愛分享！

Redis官網

https://redis.io/download

阿里云服務器安裝Redis

$ wget http://download.redis.io/releases/redis-6.0.8.tar.gz
$ tar xzf redis-6.0.8.tar.gz
$ cd redis-6.0.8
$ make

安裝程序中如果出現如下錯誤:

             serverLog(LL_NOTICE,"The server is now ready to accept connections at %s", server.unixsocket);
                                                                                              ^
server.c:5103:19: error: ‘struct redisServer’ has no member named ‘supervised_mode’
         if (server.supervised_mode == SUPERVISED_SYSTEMD) {
                   ^
server.c:5104:24: error: ‘struct redisServer’ has no member named ‘masterhost’
             if (!server.masterhost) {
                        ^
server.c:5117:15: error: ‘struct redisServer’ has no member named ‘maxmemory’
     if (server.maxmemory > 0 && server.maxmemory < 1024*1024) {
               ^
server.c:5117:39: error: ‘struct redisServer’ has no member named ‘maxmemory’
     if (server.maxmemory > 0 && server.maxmemory < 1024*1024) {
                                       ^
server.c:5118:176: error: ‘struct redisServer’ has no member named ‘maxmemory’
         serverLog(LL_WARNING,"WARNING: You specified a maxmemory value that is less than 1MB (current value is %llu bytes). Are you sure this is what you really want?", server.maxmemory);
                                                                                                                                                                                ^
server.c: In function ‘hasActiveChildProcess’:
server.c:1476:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
server.c: In function ‘allPersistenceDisabled’:
server.c:1482:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
server.c: In function ‘writeCommandsDeniedByDiskError’:
server.c:3747:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
server.c: In function ‘iAmMaster’:
server.c:4914:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
make[1]: *** [server.o] Error 1
make[1]: Leaving directory `/usr/src/redis-6.0.1/src'
make: *** [install] Error 2

出現上面錯誤的原因是redis6.0+以上安裝需要gcc版本5.3及以上，

查看當前gcc版本

gcc -v

我們發現阿里云服務器上面，centos7系統gcc版本默認為4.8.5，

所以我們需要升級gcc版本，

//升級gcc到9以上
yum -y install centos-release-scl
yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils

還需要執行下面命令，二者任選其一
//臨時將此時的gcc版本改為9
scl enable devtoolset-9 bash
//或永久改變
echo "source /opt/rh/devtoolset-9/enable" >>/etc/profile

執行完上述操作后，執行gcc -v命令，我們會發現gcc版本成功升級到了9.1.1，接下來我們繼續執行make安裝redis6.0+，應該就不會出現什么問題，

redis6.0+安裝成功后，我們如何驗證redis服務是否正常?

啟動服務端
src/redis-server

如上圖，我們發現redis服務已經正常啟動了，

redis服務端已經啟動成功，我們如何進行客戶端連接呢?

Redis組態檔

位置:redis安裝路徑下面redis.conf檔案

修改redis.conf組態檔

1.daemonize設定成yes

2.注釋掉bind 127.0.0.1 添加bind 0.0.0.0

3.protected-mode yes 改為 protected-mode no

配置阿里云安全組規則

經過上述的配置，我們現在完全可以使用redis客戶端進行連接我們的阿里云上面的redis服務了，

Redis客戶端

Redis客戶端我推薦大家使用AnotherRedisDesktopManager這個開源工具，

AnotherRedisDesktopManager地址

https://github.com/qishibo/AnotherRedisDesktopManager

AnotherRedisDesktopManager支持通過工具直接打開redis命令客戶端，

Python連接Redis

import redis

pool = redis.ConnectionPool(host='xxx', port='6379', decode_responses=True)
r = redis.Redis(host='xxx', port='6379', decode_responses=True, password='xxx')
print(r.get('name'))

Java連接Redis

import redis.clients.jedis.Jedis;

public class RedisTest {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("xxx", 6379);
        jedis.auth("root");
        System.out.println("連接成功");
        //查看服務是否運行
        System.out.println("服務正在運行: " + jedis.ping());
        System.out.println("redis 存盤的字串為: " + jedis.get("name"));
    }
}

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