java Jedis连接VMware中CentOS-7中的Redis数据库

「爱情、让人受尽委屈。」 2022-06-08 10:45 146阅读 0赞

### 用java连接虚拟机中的Redis ###

package redis.test;
    
    import redis.clients.jedis.Jedis;
    
    public class TestPing {
        
    
        @SuppressWarnings("resource")
        public static void main(String[] args) {
    
            Jedis jedis = new Jedis("192.168.161.129", 6381);
    
            System.out.println(jedis.ping());
    
        }
    }

### 总结以下连接步骤： ###

## 一. 在虚拟机centos上根据ifconfig命令确定虚拟机ip ##

[root@localhost /]# ifconfig
    ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 192.168.161.129  netmask 255.255.255.0  broadcast 192.168.161.255
            inet6 fe80::857b:658f:eda:a36d  prefixlen 64  scopeid 0x20<link>
            ether 00:0c:29:65:7d:3b  txqueuelen 1000  (Ethernet)
            RX packets 475  bytes 35307 (34.4 KiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 238  bytes 22676 (22.1 KiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
    lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
            inet 127.0.0.1  netmask 255.0.0.0
            inet6 ::1  prefixlen 128  scopeid 0x10<host>
            loop  txqueuelen 1  (Local Loopback)
            RX packets 731  bytes 122187 (119.3 KiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 731  bytes 122187 (119.3 KiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
    virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
            inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
            ether 52:54:00:6d:4b:72  txqueuelen 1000  (Ethernet)
            RX packets 0  bytes 0 (0.0 B)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 0  bytes 0 (0.0 B)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

### 其中ip为ens33中的inet 192.168.161.129，new Jedis时使用该ip。 ###

## 二. 关闭centos7默认防火墙，启用iptables防火墙 ##

### 1. 关闭firewall： ###

systemctl stop firewalld.service   #停止firewall
    systemctl disable firewalld.service   #禁止firewall开机启动
    firewall-cmd --state   #查看默认防火墙状态（关闭后显示not running，开启后显示running）

### 2. 安装iptables防火墙 ###

yum -y install iptables-services #安装iptables防火墙

### 3. 配置防火墙需要过滤的端口，即Reids使用的端口 ###

vi /etc/sysconfig/iptables #编辑防火墙配置文件

#### 配置文件内容如下： ####

# sample configuration for iptables service
    # you can edit this manually or use system-config-firewall
    # please do not ask us to add additional ports/services to this default configuration
    *filter
    :INPUT ACCEPT [0:0]
    :FORWARD ACCEPT [0:0]
    :OUTPUT ACCEPT [0:0]
    -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
    -A INPUT -p icmp -j ACCEPT
    -A INPUT -i lo -j ACCEPT
    -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
    
    -A INPUT -j REJECT --reject-with icmp-host-prohibited
    -A FORWARD -j REJECT --reject-with icmp-host-prohibited
    COMMIT

#### 将 ####

`-A INPUT -p tcp -m state --state NEW -m tcp --dport 6379 -j ACCEPT`

#### 添加到 ####

`-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT`

#### 的上面或下面，切记不要添加到最后一行，否则防火墙重启后不生效。 ####

#### 6379为Redis的端口号。 ####

#### 之后保存退出，执行以下命令： ####

systemctl restart iptables.service   #最后重启防火墙使配置生效
    systemctl enable iptables.service    #设置防火墙开机启动

#### 最后重启虚拟机。 ####

#### 若端口未配置，会报以下错误： ####

Exception in thread "main" redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketTimeoutException: connect timed out
        at redis.clients.jedis.Connection.connect(Connection.java:207)
        at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
        at redis.clients.jedis.Connection.sendCommand(Connection.java:126)
        at redis.clients.jedis.Connection.sendCommand(Connection.java:121)
        at redis.clients.jedis.BinaryClient.ping(BinaryClient.java:106)
        at redis.clients.jedis.BinaryJedis.ping(BinaryJedis.java:195)
        at redis.test.TestPing.main(TestPing.java:12)
    Caused by: java.net.SocketTimeoutException: connect timed out
        at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
        at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:589)
        at redis.clients.jedis.Connection.connect(Connection.java:184)
        ... 6 more

## 三. 修改对应的redis.conf配置文件 ##

### 1. 注释掉bind 127.0.0.1 ###

#bind 127.0.0.1

#### 如果未注释，会报以下错误： ####

Exception in thread "main" redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused: connect
        at redis.clients.jedis.Connection.connect(Connection.java:207)
        at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
        at redis.clients.jedis.Connection.sendCommand(Connection.java:126)
        at redis.clients.jedis.Connection.sendCommand(Connection.java:121)
        at redis.clients.jedis.BinaryClient.ping(BinaryClient.java:106)
        at redis.clients.jedis.BinaryJedis.ping(BinaryJedis.java:195)
        at redis.test.TestPing.main(TestPing.java:12)
    Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
        at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:589)
        at redis.clients.jedis.Connection.connect(Connection.java:184)
        ... 6 more

### 2. 关闭protected-mode ###

protected-mode no

#### 如果未关闭，会报以下错误： ####

Exception in thread "main" redis.clients.jedis.exceptions.JedisDataException: DENIED Redis is running in protected mode because protected mode is enabled, no bind address was specified, no authentication password is requested to clients. In this mode connections are only accepted from the loopback interface. If you want to connect from external computers to Redis you may adopt one of the following solutions: 1) Just disable protected mode sending the command 'CONFIG SET protected-mode no' from the loopback interface by connecting to Redis from the same host the server is running, however MAKE SURE Redis is not publicly accessible from internet if you do so. Use CONFIG REWRITE to make this change permanent. 2) Alternatively you can just disable the protected mode by editing the Redis configuration file, and setting the protected mode option to 'no', and then restarting the server. 3) If you started the server manually just for testing, restart it with the '--protected-mode no' option. 4) Setup a bind address or an authentication password. NOTE: You only need to do one of the above things in order for the server to start accepting connections from the outside.
        at redis.clients.jedis.Protocol.processError(Protocol.java:127)
        at redis.clients.jedis.Protocol.process(Protocol.java:161)
        at redis.clients.jedis.Protocol.read(Protocol.java:215)
        at redis.clients.jedis.Connection.readProtocolWithCheckingBroken(Connection.java:340)
        at redis.clients.jedis.Connection.getStatusCodeReply(Connection.java:239)
        at redis.clients.jedis.BinaryJedis.ping(BinaryJedis.java:196)
        at redis.test.TestPing.main(TestPing.java:12)

### 最后开启redis，运行一遍java程序，可以看到返回 ###

PONG

## 注：果然还是太麻烦，以后直接在centOS下载eclipse连吧 ##