redis安装和配置
安装
1，去官网（http://redis.cn/ ）下载redis-5.0.4.tar.gz
2，安装
$ tar xzf redis-5.0.4.tar.gz
$ cd redis-5.0.4
$ make
3,进入到解压后的 src 目录，通过如下命令启动Redis:
$ src/redis-server
4,您可以使用内置的客户端与Redis进行交互:
$ src/redis-cli
redis> ping
PONG
redis> ping hello
"hello"
5，远程访问redis-server,需要指定redis-server所在主机的IP和端口号
$ src/redis-cli -h 192.168.x.x -p 6380
6,在客户端关闭redis server
$ 127.0.0.1:6379> SHUTDOWN
设置
配置文件所在的路径：解压redis-5.0.4.tar.gz后，的根目录下。
文件名：redis.conf
1，设置服务器端是否让服务器主机以外的客户端访问它
-
只允许服务器主机内的客户端访问
# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES # JUST COMMENT THE FOLLOWING LINE. # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ bind 127.0.0.1 # 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 -
允许服务器主机以外的客户端访问
# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES # JUST COMMENT THE FOLLOWING LINE. # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # bind 127.0.0.1 # 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 no
进行上述设置后，在别的主机应该就能访问redis服务器了，但是如果还是访问不了，就需要看看防火墙的设置。一般在ubuntu下，进行上述设置后，在别的主机应该就能访问redis服务器了。
2，是否让redis服务器以守护进程的方式启动
-
不让redis服务器以守护进程的方式启动
# By default Redis does not run as a daemon. Use 'yes' if you need it. # Note that Redis will write a pid file in /var/run/redis.pid when daemonized. daemonize no -
让redis服务器以守护进程的方式启动,并且把守护进程的pid写入到文件：/var/run/redis.pid中
# By default Redis does not run as a daemon. Use 'yes' if you need it. # Note that Redis will write a pid file in /var/run/redis.pid when daemonized. daemonize yes
3，设置记录守护进程的pid的文件
# Creating a pid file is best effort: if Redis is not able to create it
# nothing bad happens, the server will start and run normally.
pidfile /var/run/redis_6379.pid
4，设置log的级别和log文件所在的目录。如果想把日志不写入日志文件，而打印到终端的话，
【logfile stdout】
# Specify the server verbosity level.
# This can be one of:
# debug (a lot of information, useful for development/testing)
# verbose (many rarely useful info, but not a mess like the debug level)
# notice (moderately verbose, what you want in production probably)
# warning (only very important / critical messages are logged)
loglevel notice
# Specify the log file name. Also the empty string can be used to force
# Redis to log on the standard output. Note that if you use standard
# output for logging but daemonize, logs will be sent to /dev/null
logfile "/目录/文件名"
5，设置数据库的个数
# Set the number of databases. The default database is DB 0, you can select
# a different one on a per-connection basis using SELECT <dbid> where
# dbid is a number between 0 and 'databases'-1
databases 16
在客户端，可以用【select 数据库标号】，来选定要操作的数据库，从0开始，默认是0号数据库。
6，设置持久化类型。
-
rdb方式：默认方式
- 特点：
- 把内存中数据直接存储在磁盘
- 按照一定的频率做数据存储
- 缺点：
- 存储频率设定的高的话，效率就会低
- 存储频率设定的低的话，同步就不及时
- 优点：数据恢复快
- 特点：
-
aof方式：
-
特点：把每个命令直接存储在磁盘
-
缺点：数据恢复慢
-
优点：
- 数据存储到磁盘效率高，因为存的是命令，不是数据。
- 占用磁盘空间小。
-
-
设定rdb方式的存储频率
# In the example below the behaviour will be to save: # after 900 sec (15 min) if at least 1 key changed # after 300 sec (5 min) if at least 10 keys changed # after 60 sec if at least 10000 keys changed # # Note: you can disable saving completely by commenting out all "save" lines. # # It is also possible to remove all the previously configured save # points by adding a save directive with a single empty string argument # like in the following example: # # save "" save 900 1 save 300 10 save 60 10000 -
设定rdb的文件名
# The filename where to dump the DB dbfilename dump.rdb -
设定rdb的路径
# The working directory. # # The DB will be written inside this directory, with the filename specified # above using the 'dbfilename' configuration directive. # # The Append Only File will also be created inside this directory. # # Note that you must specify a directory here, not a file name. dir ./ -
启动AOF，并设置aof的文件名。注意：要把rdb方式disable掉。
############################## APPEND ONLY MODE ############################### # By default Redis asynchronously dumps the dataset on disk. This mode is # good enough in many applications, but an issue with the Redis process or # a power outage may result into a few minutes of writes lost (depending on # the configured save points). # # The Append Only File is an alternative persistence mode that provides # much better durability. For instance using the default data fsync policy # (see later in the config file) Redis can lose just one second of writes in a # dramatic event like a server power outage, or a single write if something # wrong with the Redis process itself happens, but the operating system is # still running correctly. # # AOF and RDB persistence can be enabled at the same time without problems. # If the AOF is enabled on startup Redis will load the AOF, that is the file # with the better durability guarantees. # # Please check http://redis.io/topics/persistence for more information. appendonly yes # The name of the append only file (default: "appendonly.aof") appendfilename "appendonly.aof -
设定AOF的存储频率
# Redis supports three different modes: # # no: don't fsync, just let the OS flush the data when it wants. Faster. # always: fsync after every write to the append only log. Slow, Safest. # everysec: fsync only one time every second. Compromise. # # The default is "everysec", as that's usually the right compromise between # speed and data safety. It's up to you to understand if you can relax this to # "no" that will let the operating system flush the output buffer when # it wants, for better performances (but if you can live with the idea of # some data loss consider the default persistence mode that's snapshotting), # or on the contrary, use "always" that's very slow but a bit safer than # everysec. # # More details please check the following article: # http://antirez.com/post/redis-persistence-demystified.html # # If unsure, use "everysec". # appendfsync always appendfsync everysec # appendfsync no- appendfsync always:随时存储
- appendfsync everyse：1秒存储一次
- appendfsync no：不存储。
hiredis的安装
$ unzip hiredis-master.zip
$ cd hiredis-master
$ make
$ sudo make install
hiredis是用C语言操作redis数据库的API库
hiredis的下载地址：
https://github.com/redis/hiredis
c/c++ 学习互助QQ群：877684253
