最近一台电脑突然系统崩溃了，想做个新增节点的实验。由于之前装的都是ubuntu操作系统，于是想选个异构的REDHAT试试。
在试验第一步，装了个REDIS进行看看，才发现远程无法访问，以前由于都装了有SSH，能轻松访问。而这回出现的错误是：Could not connect to Redis at 192.168.2.195:6379: No route to host
这个问题以前还真没遇到过。网上一查，才发现是新装系统设置的iptables问题。
于是设置
代码语言：javascript复制iptables -N REDIS
iptables -A REDIS -s 192.168.10.1 -j ACCEPT
iptables -A REDIS -s 192.168.10.2 -j ACCEPT
iptables -A REDIS -j LOG --log-prefix "unauth-redis-access"
iptables -A REDIS -j REJECT --reject-with icmp-port-unreachable
iptables -I INPUT -p tcp --dport 6379 -j REDIS或者
sudo iptables -F
如下测试：
ndscbigdata@ubuntu-bigdata-3:/usr/local/bin$ redis-cli -h "192.168.2.195" -p 6379
Could not connect to Redis at 192.168.2.195:6379: No route to host
not connected> quit
ndscbigdata@ubuntu-bigdata-3:/usr/local/bin$ redis-cli -h "192.168.2.195" -p 6379
Could not connect to Redis at 192.168.2.195:6379: No route to host
not connected> quit
ndscbigdata@ubuntu-bigdata-3:/usr/local/bin$ redis-cli -h "192.168.2.195" -p 6379
192.168.2.195:6379> select 10
(error) NOAUTH Authentication required.
192.168.2.195:6379> quit
ndscbigdata@ubuntu-bigdata-3:/usr/local/bin$ redis-cli -h 192.168.2.195 -p 6379 -a ndscndscndsc
192.168.2.195:6379> select 10
OK
192.168.2.195:6379[10]> keys *
1) "189234234"
2) "123"
192.168.2.195:6379[10]>
