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

解放方案：

vi /etc/sysctl.conf

追加

net.core.somaxconn = 1024

保存后重新加载配置文件

sysctl -p

再次启动redis即可

systemctl start redis