【redis的链接】redis的两种连接方法

执行redis-server /etc/redis.conf开启服务

方法一：

[root@zhangmeng ~]# redis-cli
127.0.0.1:>
127.0.0.1:> quit 

方法二：

[root@zhangmeng ~]# telnet 192.168.2.42
-bash: telnet: command not found
[root@zhangmeng ~]# 

提示telnet命令不存在，安装telnet

[root@zhangmeng ~]# yum -y install telnet*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.cn99.com
 * extras: mirrors.cn99.com
 * updates: mirrors.cn99.com
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package telnet.x86_64 :0.17-.el6 will be installed
---> Package telnet-server.x86_64 :0.17-.el6 will be installed
--> Processing Dependency: xinetd for package: :telnet-server-0.17-.el6.x86_64
--> Running transaction check
---> Package xinetd.x86_64 :2.3.-.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==================================================================================================================
 Package                       Arch                   Version                          Repository            Size
==================================================================================================================
Installing:
 telnet                        x86_64                 :0.17-.el6                    base                   k
 telnet-server                 x86_64                 :0.17-.el6                    base                   k
Installing for dependencies:
 xinetd                        x86_64                 :2.3.-.el6                  base                  k

Transaction Summary
==================================================================================================================
Install        Package(s)

Total download size:  k
Installed size:  k
Downloading Packages:
(/): telnet-0.17-.el6.x86_64.rpm                                                       |   kB     :
(/): telnet-server-0.17-.el6.x86_64.rpm                                                |   kB     :
(/): xinetd-2.3.-.el6.x86_64.rpm                                                     |  kB     :
------------------------------------------------------------------------------------------------------------------
Total                                                                              kB/s |  kB     :
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : :xinetd-2.3.-.el6.x86_64                                                                  /
  Installing : :telnet-server-0.17-.el6.x86_64                                                             /
  Installing : :telnet-0.17-.el6.x86_64                                                                    /
  Verifying  : :telnet-server-0.17-.el6.x86_64                                                             /
  Verifying  : :telnet-0.17-.el6.x86_64                                                                    /
  Verifying  : :xinetd-2.3.-.el6.x86_64                                                                  / 

Installed:
  telnet.x86_64 :0.17-.el6                          telnet-server.x86_64 :0.17-.el6                         

Dependency Installed:
  xinetd.x86_64 :2.3.-.el6                                                                                   

Complete!

再次连接，还是不行

[root@zhangmeng ~]# telnet 192.168.2.42
Trying 192.168.2.42...
telnet: connect to address 192.168.2.42: Connection refused

查看23号端口是关闭的

[root@zhangmeng ~]#  netstat -tnl |grep 

把telnet打开（disable从yes改为no）

[root@zhangmeng ~]# cat /etc/xinetd.d/telnet
# default: on
# description: The telnet server serves telnet sessions; it uses \
#    unencrypted username/password pairs for authentication.
service telnet
{
    flags        = REUSE
    socket_type    = stream
    wait        = no
    user        = root
    server        = /usr/sbin/in.telnetd
    log_on_failure    += USERID
    disable        = no
}

重启xinetd服务

[root@zhangmeng ~]# service xinetd restart
Stopping xinetd:                                           [  OK  ]
Starting xinetd:                                           [  OK  ]

再次查看telnet服务开启的

[root@zhangmeng ~]#  netstat -tnl |grep
tcp               :::                       :::*                        LISTEN      

再次连接（不加端口），可以访问（如果输入错误无法退出可用ctrl+】，会强制退出到telnet命令行，再输入quit退出即可）

[root@zhangmeng ~]# telnet 192.168.2.42
Trying 192.168.2.42...
Connected to 192.168.2.42.
Escape character is '^]'.
CentOS release 6.4 (Final)
Kernel 2.6.-.el6.x86_64 on an x86_64
login: root
Password:
Login incorrect 

用root用户无法直接登录，新建普通用户tom，以tom账号登录，再切换到root用户

[root@zhangmeng ~]# useradd tom
-bash: password: command not found
[root@zhangmeng ~]# passwd tom
Changing password for user tom.
New password:
BAD PASSWORD: it is too simplistic/systematic
BAD PASSWORD: is too simple
Retype new password:
passwd: all authentication tokens updated successfully.

发现设置密码的时候说密码太简单，让重新输，那如果我就要用那个简单的密码不希望收到提示可以用另一种方法

[root@zhangmeng ~]# useradd bob
[root@zhangmeng ~]# echo  |passwd --stdin bob
Changing password for user bob.
passwd: all authentication tokens updated successfully.
[root@zhangmeng ~]# 

再用tom用户登录，可以登录成功

[root@zhangmeng ~]# telnet 192.168.2.42
Trying 192.168.2.42...
Connected to 192.168.2.42.
Escape character is '^]'.
CentOS release 6.4 (Final)
Kernel 2.6.-.el6.x86_64 on an x86_64
login: tom
Password:
[tom@zhangmeng ~]$ 

切换到root用户

[tom@zhangmeng ~]$ su - root
Password:
[root@zhangmeng ~]# 

再次连接（加端口），还是不能访问

[root@zhangmeng ~]# telnet 192.168.2.42
Trying 192.168.2.42...
telnet: connect to address 192.168.2.42: Connection refused

上网查了一下，是redis.conf配置文件里面的ip需要修改（bind 127.0.0.1 ::1 改为 bind 193.168.2.42）

# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES
# JUST COMMENT THE FOLLOWING LINE.
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bind 192.168.2.42

# Protected mode is a layer of security protection, in order to avoid that
# Redis instances left open on the internet are accessed and exploited.
#
# When protected mode is on and if:

改完配置文件后，重启redis服务,再次连接（终于连上啦，不容易啦）

[root@zhangmeng ~]# telnet 192.168.2.42
Trying 192.168.2.42...
Connected to 192.168.2.42.
Escape character is '^]'.

完！