闭深入了解如何关闭Redis服务（redis服务怎么关）

Redis是一个开源的高性能的Key-Value数据库，它支持多种数据类型的存储，如字符串、列表、哈希、集合等等。作为企业级应用开发中的关键组件之一，很多开发者都会将Redis服务部署到自己的应用环境中。但是，有些时候我们需要关闭Redis服务，比如在应用程序维护、故障排除或者系统升级等情况下。那么，如何以最小的代价来关闭Redis服务呢？

一、在shell中直接关闭Redis服务

最简单的方法是在shell中直接关闭Redis服务。以CentOS 7.8为例，我们需要进入到Redis安装目录下的bin目录，执行下面的命令来关闭Redis服务：

./redis-cli SHUTDOWN

这条命令将向Redis服务器发送关闭命令，Redis将会在安全的方式下结束自己的工作。

二、通过Redis配置文件关闭服务

如果Redis已经在运行但您希望更改配置，那么您可以修改Redis的配置文件。以Redis的默认配置文件/etc/redis/redis.conf为例，下面是如何关闭Redis服务的几行：

# Require clients to issue AUTH command before processing
# any other commands. This might be useful in environments
# where you do not trust others with access to the Redis
# server instance hosting your data.
#
# This should stay commented out for backward compatibility and because most
# people do not need auth (e.g. they run their own servers).
# 
# requirepass foobared
# Stop accepting new connections from clients.
#
# This command will immediately stop accepting new connections.
# You can use this option when you want to apply the configuration
# changes to a running Redis-server or if you want to gracefully
# shutdown it for mntenance.
#
# The clients connected to the Redis server will still be served
# for the number of seconds specified by the 'timeout' configuration
# directive.
#
# This command does not flush the database but just stops accepting
# new connections, so all the data remns saved in memory.
# 
# By default Redis does not run as a daemon. Use 'daemonize yes' to
# fork the Redis process into the background.
#
# Note that Redis will not stop the server if clients are connected.
# Exit the client before shutting down the server.
stop-writes-on-bgsave-error no
# Close the connection to the client after a timeout.
#
# If the client is idle for the specified number of seconds, the connection is
# closed.
#
# The timeout value is given in seconds. In the example below, the timeout is set
# to 300 seconds (5 minutes).
#
# A value of 0 means that the timeout is disabled.
timeout 0
# Set the maximum number of connected clients.
#
# The default value is 10000.
#
# maxclients 10000

# Set the maximum number of connections Redis can handle.
#
# The default value is 100000.
#
# maxmemory 1000mb

在文件中找到下面这段代码，将stop-writes-on-bgsave_error的值修改为yes：

# Stop accepting new connections from clients.
stop-writes-on-bgsave_error yes

然后重启Redis服务：

service redis restart

Redis将在shutdown后重启，并在安全地方式下执行。

三、通过命令行关闭Redis服务

在Redis服务运行时，您也可以在命令行模式下直接关闭服务。进入redis-cli模式后，执行shutdown命令即可：

redis-cli
shutdown

Redis将会在安全的方式下结束自己的工作。

总结

关闭Redis服务是一个非常容易的操作。您可以使用命令行操作、修改配置文件或者使用命令行模式下的命令来关闭Redis服务。无论采用何种方式，在关闭Redis之前请确保在关闭前已经保存了所有的数据，否则您将会失去宝贵的数据。