Redis protected-mode

长枪不倒

　　Redis protected-mode 是3.2 之后加入的新特性，在Redis.conf的注释中，我们可以了解到，他的具体作用和启用条件
# Protected mode is a layer of security protection, in order to avoid that　　
# Redis instances left open on the internet are accessed and exploited.
　　
#
　　
# When protected mode is on and if:
　　
#
　　
# 1) The server is not binding explicitly to a set of addresses using the
　　
#    "bind" directive.
　　
# 2) No password is configured.
　　
#
　　
# The server only accepts connections from clients connecting from the
　　
# IPv4 and IPv6 loopback addresses 127.0.0.1 and ::1, and from Unix domain# sockets.
　　
#
　　
# By default protected mode is enabled. You should disable it only if# you are sure you want clients from other hosts to connect to Redis
　　
# even if no authentication is configured, nor a specific set of interfaces
　　
# are explicitly listed using the "bind" directive.
　　
protected-mode yes
　　可以看到 Protected-mode 是为了禁止公网访问redis cache，加强redis安全的。
　　它启用的条件，有两个：
　　1） 没有bind IP
　　2） 没有设置访问密码
　　如果启用了，则只能够通过lookback ip（127.0.0.1）访问Redis cache，如果从外网访问，则会返回相应的错误信息：

　　(error) DENIED Redis is running in protected mode because protected mode is enabled, no bind address was specified, no authentication password is requested to clients. In this mode connections are only accepted from the lookback interface. If you want to connect from external computers to Redis you may adopt one of the following solutions: 1) Just disable protected mode sending the command 'CONFIG SET protected-mode no' from the loopback interface by connecting to Redis from the same host the server is running, however MAKE SURE Redis is not publicly accessible from internet if you do so. Use CONFIG REWRITE to make this change permanent. 2)>