早上一个应用日志打印报错信息：
在应用上telnet端口和ping都没有问题，为什么还获取不到值呢。
先安装一个redis客户端进行测试：yum -y install redis
redis-cli -h 192.168.32.12 -p 6887
然后就报错了：
(error) DENIED Redis is running in protected mode because protected mode is……
后来就查看配置发现redis.conf 该行也是注释的：
# requirepass foobared
继续排查发现和一个参数配置有关系：
链接redis 时只能通过本地localhost (127.0.0.1）这个来链接，而不能用网络ip(192.168..)这个链接，问题然如果用网络ip 链接会报以下的错误：
(error) 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 lookback 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 --portected-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.
是说处于保护模式，只能本地链接，我们需要修改配置文件../redis.conf
1)打开配置文件把下面对应的注释掉
# bind 127.0.0.1
2)Redis默认不是以守护进程的方式运行，可以通过该配置项修改，使用yes启用守护进程，设置为no
daemonize no
3)保护模式
protected-mode no
报错处理：
一、
在对应配置conf文件中去掉注释，把yes改为no
#protected-mode yes
protected-mode no
重启redis（注意有数据时慎重启）
kill -9 进程号
redis-cli -h 192.168.32.12 -p 6887 shutdown
二、添加认证，设置密码
# requirepass foobared
requirepass redis123456
验证
再次用Java程序建立连接池，没有报错，且可以对redis server进行数据正常处理。程序报错日志不再显示
问题解决
linux下查看redis是否正常运行
make
make PREFIX=/usr/local/redis install
mkdir /etc/redis/
cp redis.conf /etc/redis/
打开redis.conf文件修改daemonize yes即可在后台运行
vim /etc/redis/redis.conf
使用配置文件启动redis服务
./redis-server /etc/redis/redis.conf
如何查看redis服务正常启动？
使用ps查看或netstat
ps aux | grep redis-server
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