redis绑定多个监听ip或者取消绑定
如果系统某个端口6379绑定监听ip127.0.0.1，则该端口只会通过来自这个ip的连接请求，拒绝非监听ip主机的连接。telnet 10.10.86.211 9000
Trying 10.10.86.211...
telnet: connect to address 10.10.86.211: Connection refused
另外一个原因：防火墙拦截。（只需要在被telnet服务器的firewall中放开相应主机ip，端口即可）
若为该端口绑定监听ip，而造成connection refused，分析解决：
# netstat -anp |grep 6379
tcp 0 0 127.0.0.1:6379 0.0.0.0:* LISTEN 12159/redis-server
tcp 0 0 127.0.0.1:40345 127.0.0.1:6379 ESTABLISHED 14735/python
tcp 0 0 127.0.0.1:6379 127.0.0.1:40337 ESTABLISHED 12159/redis-server
tcp 0 0 127.0.0.1:6379 127.0.0.1:40335 ESTABLISHED 12159/redis-server
tcp 0 0 127.0.0.1:40339 127.0.0.1:6379 ESTABLISHED 14735/python
tcp 0 0 127.0.0.1:40343 127.0.0.1:6379 ESTABLISHED 14735/python
tcp 0 0 127.0.0.1:40347 127.0.0.1:6379 ESTABLISHED 14735/python
tcp 0 0 127.0.0.1:6379 127.0.0.1:40345 ESTABLISHED 12159/redis-server
可知6379端口监听本地地址127.0.0.1
或者修改配置文档（比如redis，/etc/redis.cnf）
vim /etc/redis.cnf
bind 127.0.0.1前面添加#，则6379端口不会只监听本地ip
$ telnet 10.10.86.211 6379
# netstat -anp |grep 6379
tcp 0 0 0.0.0.0:6379 0.0.0.0:* LISTEN 12341/redis-server
tcp 0 0 10.10.86.211:6379 10.10.86.200:52808 ESTABLISHED 12341/redis-server
tcp6 0 0 :::6379 :::* LISTEN 12341/redis-server
tcp6 0 0 ::1:6379 ::1:54007 ESTABLISHED 12341/redis-server
tcp6 0 0 ::1:6379 ::1:54009 ESTABLISHED 12341/redis-server
tcp6 0 0 ::1:54009 ::1:6379 ESTABLISHED 14735/python
tcp6 0 0 ::1:6379 ::1:54005 ESTABLISHED 12341/redis-server
tcp6 0 0 ::1:54006 ::1:6379 ESTABLISHED 14735/python
tcp6 0 0 ::1:6379 ::1:54008 ESTABLISHED 12341/redis-server
显示其他ip可以telnet服务器该端口。
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