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redis主从复制

时间:2014-10-15 22:40:51      阅读:267      评论:0      收藏:0      [点我收藏+]

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Redis 是一个高性能的key-value数据库。 redis的出现,很大程度补偿了memcached这类keyvalue存储的不足,在部分场合可以对关系数据库起到很好的补充作用。它提供了Python,Ruby,Erlang,PHP客户端,使用很方便。

性能测试结果:

SET操作每秒钟 110000 次,GET操作每秒钟 81000 次,服务器配置如下:

Linux 2.6, Xeon X3320 2.5Ghz.

stackoverflow 网站使用 Redis 做为缓存服务器。

redis可以做一个主从复制的设置,见redis.conf

################################# REPLICATION #################################
# Master-Slave replication. Use slaveof to make a Redis instance a copy of
# another Redis server. Note that the configuration is local to the slave
# so for example it is possible to configure the slave to save the DB with a
# different interval, or to listen to another port, and so on.
#
# slaveof <masterip> <masterport> #主服务ip和端口

# If the master is password protected (using the "requirepass" configuration
# directive below) it is possible to tell the slave to authenticate before
# starting the replication synchronization process, otherwise the master will
# refuse the slave request.
#
# masterauth <master-password> #如果master设置了密码,slave需要进行认证

# When a slave loses its connection with the master, or when the replication
# is still in progress, the slave can act in two different ways:
#
# 1) if slave-serve-stale-data is set to ‘yes‘ (the default) the slave will
#    still reply to client requests, possibly with out of date data, or the
#    data set may just be empty if this is the first synchronization.
#
# 2) if slave-serve-stale-data is set to ‘no‘ the slave will reply with
#    an error "SYNC with master in progress" to all the kind of commands
#    but to INFO and SLAVEOF.
#
#当slave失去与master的连接,或正在拷贝中,如果为yes,slave会响应客户端请求,数据可能不同步甚至没有数据,如果为no,slave会返回错误"SYNC with master in progress"

slave-serve-stale-data yes
# You can configure a slave instance to accept writes or not. Writing against
# a slave instance may be useful to store some ephemeral data (because data
# written on a slave will be easily deleted after resync with the master) but
# may also cause problems if clients are writing to it because of a
# misconfiguration.
#
# Since Redis 2.6 by default slaves are read-only.
#
# Note: read only slaves are not designed to be exposed to untrusted clients
# on the internet. It‘s just a protection layer against misuse of the instance.
# Still a read only slave exports by default all the administrative commands
# such as CONFIG, DEBUG, and so forth. To a limited extend you can improve
# security of read only slaves using ‘rename-command‘ to shadow all the
# administrative / dangerous commands.
slave-read-only yes #从服务器只读,不可写 # Slaves send PINGs to server in a predefined interval. It‘s possible to change # this interval with the repl_ping_slave_period option. The default value is 10 # seconds. # # repl-ping-slave-period 10 # The following option sets a timeout for both Bulk transfer I/O timeout and # master data or ping response timeout. The default value is 60 seconds. # # It is important to make sure that this value is greater than the value # specified for repl-ping-slave-period otherwise a timeout will be detected # every time there is low traffic between the master and the slave. # # repl-timeout 60 # Disable TCP_NODELAY on the slave socket after SYNC? # # If you select "yes" Redis will use a smaller number of TCP packets and # less bandwidth to send data to slaves. But this can add a delay for # the data to appear on the slave side, up to 40 milliseconds with # Linux kernels using a default configuration. # # If you select "no" the delay for data to appear on the slave side will # be reduced but more bandwidth will be used for replication. # # By default we optimize for low latency, but in very high traffic conditions # or when the master and slaves are many hops away, turning this to "yes" may # be a good idea. repl-disable-tcp-nodelay no # The slave priority is an integer number published by Redis in the INFO output. # It is used by Redis Sentinel in order to select a slave to promote into a # master if the master is no longer working correctly. # A slave with a low priority number is considered better for promotion, so # for instance if there are three slaves with priority 10, 100, 25 Sentinel will # pick the one wtih priority 10, that is the lowest. # # However a special priority of 0 marks the slave as not able to perform the # role of master, so a slave with priority of 0 will never be selected by # Redis Sentinel for promotion. # # By default the priority is 100. slave-priority 100 #如果master不能再正常工作,那么会在多个slave中,选择优先值最小的一个slave提升为master,优先值为0表示不能提升为master

看了上面的默认配置,其实也很容易理解,修改下就可以配置主从复制了,有 slaveof <masterip> <masterport> ,就成了从服务器 ,没有就是主服务器

主服务器,从服务器,配置一样,只不过 修改/etc/redis.conf 中 

slaveof 192.168.1.33 6379

然后开启从服务器的redis服务。

测试

#主服务器
redis-cli -p 6379 set hello world

#从服务器

redis-cli -p 6379 get hello
"world"

#主服务器
redis-cli -p 6379 set hello world2

#从服务器

redis-cli -p 6379 get hello
"world2"

redis-cli -p 6379 set hello world
(error) READONLY You can‘t write against a read only slave.

#成功 配置主从redis 服务器。好简单啊。

由于配置中有一条 从服务器 是只读的,所以从服务器 没法设置数据,只可以读取数据

redis主从复制

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原文地址:http://www.cnblogs.com/phpfans/p/4027382.html

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