Redis危险命令禁用keys、flushdb、flushall及解决方案

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Redis的危险命令主要有以下几个

keys 查找所有符合给定模式pattern(正则表达式)的 key 。 时间复杂度为O(N),N为数据库里面key的数量。 速度极快,在一百万的key数据库中查询时间大约是40毫秒。 redis> MSET one 1 two 2 three 3 four 4 OK redis> KEYS o

“four” “one” “two” redis> KE 警告:不建议使用!!! 对 Redis 稍微有点使用经验的人都知道线上是不能执行 keys * 相关命令的,虽然其模糊匹配功能使用非常方便也很强大,在小数据量情况下使用没什么问题,数据量大会导致 Redis 锁住及 CPU 飙升,在生产环境建议禁用或者重命名!

血的教训:某公司工程师在生产环境中直接执行:key wxdb … cf8 命令,导致redis卡死锁住,CPU飙升,导致支付链路卡住,所有请求卡死在数据库中,导致数据库发生雪崩效应,发生了数据库宕机事件。 损失惨重!

flushdb 删除Redis中当前所在数据库中的所有记录,并且该命令是原子性的,不会终止执行,一旦执行,将不会执行失败。

flushall 删除Redis中所有数据库中的所有记录,并且该命令是原子性的,不会终止执行,一旦执行,将不会执行失败。

config 客户端可修改 Redis 配置

解决方案-命令禁用 在redis中修改配置文件redis.conf找到 SECURITY 区域,如下图

################################## SECURITY ###################################

# Require clients to issue AUTH  before processing any other
# commands.  This might be useful in environments in which you do not trust
# others with access to the host running redis-server.
#
# This should stay commented out for backward compatibility and because most
# people do not need auth (e.g. they run their own servers).
#
# Warning: since Redis is pretty fast an outside user can try up to
# 150k passwords per second against a good box. This means that you should
# use a very strong password otherwise it will be very easy to break.
#
# requirepass foobared

# Command renaming.
#
# It is possible to change the name of dangerous commands in a shared
# environment. For instance the CONFIG command may be renamed into something
# hard to guess so that it will still be available for internal-use tools
# but not available for general clients.
#
# Example:
#
# rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52
#
# It is also possible to completely kill a command by renaming it into
# an empty string:
#
# rename-command CONFIG ""
#
# Please note that changing the name of commands that are logged into the
# AOF file or transmitted to slaves may cause problems.

注意其中的rename-command ,修改即可完成命令禁用

禁用命令

rename-command KEYS     ""
rename-command FLUSHALL ""
rename-command FLUSHDB  ""
rename-command CONFIG   ""

重命名命令

rename-command KEYS     "XXXXX"
rename-command FLUSHALL "XXXXX"
rename-command FLUSHDB  "XXXXX"
rename-command CONFIG   "XXXXX"

这样可以定义新命令,然后在客户端就不会执行危险命令了

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Redis危险命令禁用keys、flushdb、flushall及解决方案插图

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