修改redis.conf后，重启redis，发现修改的配置未生效，原来是需要在启动redis的时候在命令中加上配置文件，命令如下
./redis-server /usr/local/redis-3.2.8/redis.conf &
仔细阅读配置文件可以开头看到有这样的描述
# Note that in order to read the configuration file, Redis must be
# started with the file path as first argument:
#
# ./redis-server /path/to/redis.conf
所以问题就在这
