redis安装过程中一些注意事项

一、首先去官网找到redis下载链接，然后切换到你存储安装包的路径，输入如下命令

wget redis下载链接

二、下载完成后，解压

tar -zxvf redis压缩包名称

三、编译

cd 解压后的目录

make

四、测试（可以跳过），测试过程中提示少什么文件就安装什么文件即可，yum安装

make test

五、安装

make install

六、安装完成后，会产生一个src文件夹，将src拷贝到/usr/local/redis/下，

mv ./src /usr/local/redis/

七、切换到上一级目录。将目录下的redis.conf文件拷贝到/usr/local/redis/etc/目录下

cd ..

mv redis.conf /usr/local/redis/etc/

八、启动redis服务，切换到/usr/local/redis/目录下

cd /usr/local/redis

./redis-server /usr/local/redis/etc/redis.conf

启动后会有一些警告，处理掉这些警告

警告1：WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.

解决方法：

echo "vm.overcommit_memory=1" >> /etc/sysctl.conf

sysctl -p

警告2：WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it
to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.

解决方法：

echo never > /sys/kernel/mm/transparent_hugepage/enabled

警告3：WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.

解决方法：

echo 511 > /proc/sys/net/core/somaxconn

九、修改配置文件，使其后台运行

daemonize yes //将no改成yes即可

/usr/local/redis/redis-server /usr/local/redis/etc/redis.conf

十、如何启动多个redis-server实例

只需要将配置文件（/usr/local/redis/etc/redis.conf）复制一份，修改成redis6380.conf，修改其中的端口号为6380，然后启动

/usr/local/redis/redis-server /usr/local/redis/etc/redis6380.conf

十一、输入./redis-cli进入。