MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. 
Commands that may modify the data set are disabled. Please check Redis logs for details about the error.

redis 127.0.0.1:6379> config set stop-writes-on-bgsave-error no

1.看redis服务是否启动，端口是否未开

2.服务器端的防火墙是否关闭

3.屏蔽redis.conf文件中bind 127.0.0.1

服务器上默认的文件句柄1024，直接爆了

查看句柄大小

[root@ecs-4655-0531492 ~]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 127999
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1000000
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 1000000
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

设置大小

[root@ecs-4655-0531492 ~]# ulimit -n 100000

有时候设置没生效，直接写入配置文件就好

vi /etc/security/limits.conf

* soft nproc 1000000
* hard nproc 1000000
* soft nofile 1000000
* hard nofile 1000000