Centos6.6部署Redis集群 1
环境准备 1
环境安装redis 1
安装ruby 2
配置redis主从环境 3
部署redis sentinel服务器 5
集群使用 13
当前集群环境说明 13
测试功能点 14
测试点1： 14
测试点2： 14
测试点3： 14
测试点4： 15
环境准备
Centos6.6虚拟机4台,redis3.2.4版本源码
环境安装redis
需要root用户
tar -zxvf redis-3.2.4.tar.gz
cd redis-3.2.4
make
make install
若中间没有出错，则此时redis基本功能已安装完毕，在4台虚拟机上重复此操作。
安装ruby
从ruby官网获取大于2.2版本以上的ruby源码，下载到环境上。
安装依赖包
yum install openssl-devel zlib-devel
解压ruby源码
cd ruby-2.3.7
./configure
make
make install
cd /usr/local/bin
./gem install redis #安装redis远程通讯组件
如果出现失败一般会说是缺少zlib或者openssl
如果缺少zlib，安装zlib-devel之后
cd ruby-2.3.7
cd ext/zlib
ruby ./extconf.rb
若成功生成Makefile
make
make install
同理，若openssl报错则
cd ext/openssl
ruby ./extconf.rb
make
make install
之后在回到/use/local/bin
执行./gem install redis
配置redis主从环境
首先我们在192.168.1.233虚拟机里创建2个节点，端口分别是7001，7002
cd /home/redis1
[root@localhost ~]# mkdir redis_cluster
[root@localhost ~]# cd redis_cluster/
[root@localhost redis_cluster]# mkdir 7001 7002
同理我们在redis2 redis3虚拟机里分别创建2个节点，端口分别是7003，7004，7005，7006
分别修改7001-7006下的配置文件
[root@localhost ~] vi redis_cluster/7001/redis.conf
bind 192.168.0.164 #默认ip为127.0.0.1 需要改为其他节点机器可访问的ip 否则创建集群时无法访，和单机集群有区别
daemonize yes #redis后台运行
pidfile /var/run/redis_7001.pid #pidfile文件对应7001-7003
cluster-enabled yes #开启集群
cluster-config-file nodes_7001.conf #保存节点配置，自动创建，自动更新对应7001-7003
cluster-node-timeout 5000 #集群超时时间，节点超过这个时间没反应就断定是宕机
其他几台节点把7001换成700x即可。
在三台虚拟机上分别启动所有服务节点
redis1
redis-server /home/redis1/redis_cluster/7001/redis.conf
redis-server /home/redis1/redis_cluster/7002/redis.conf
redis2
redis-server /home/redis2/redis_cluster/7003/redis.conf
redis-server /home/redis2/redis_cluster/7004/redis.conf
redis3
redis-server /home/redis3/redis_cluster/7005/redis.conf
redis-server /home/redis3/redis_cluster/7006/redis.conf
关闭所有机器防火墙
service iptables stop
将redis1作为控制节点，从redis源码目录中找到
redis-trib.rb
在src目录中
cp redis-trib.rb /usr/local/bin
[root@localhost ~]# redis-trib.rb create --replicas 1 192.168.1.233:7001 192.168.1.233:7002 192.168.1.254:7003 192.168.1.254:7004 192.168.1.11:7005 192.168.1.11:7006
如类似下图的显示则表示集群启动成功
以上若报错，参考此教程https://blog.csdn.net/duguxingfeng/article/details/78918333
部署redis sentinel服务器
将redis4部署成监视节点用的sentinel服务器
cd /home/redis4
mkdir redis-sentinel
cd redis-sentinel
mkdir 26379 36379 46379
从源码包中
cp sentinel.conf 到上述三个子目录
修改conf文件，参考下面的，只需要修改端口号即可
# Example sentinel.conf
# *** IMPORTANT ***
#
# By default Sentinel will not be reachable from interfaces different than
# localhost, either use the 'bind' directive to bind to a list of network
# interfaces, or disable protected mode with "protected-mode no" by
# adding it to this configuration file.
#
# Before doing that MAKE SURE the instance is protected from the outside
# world via firewalling or other means.
#
# For example you may use one of the following:
#
# bind 127.0.0.1 192.168.1.1
#
protected-mode no
# port <sentinel-port>
# The port that this sentinel instance will run on
port 26379
daemonize yes
# sentinel announce-ip <ip>
# sentinel announce-port <port>
#
# The above two configuration directives are useful in environments where,
# because of NAT, Sentinel is reachable from outside via a non-local address.
#
# When announce-ip is provided, the Sentinel will claim the specified IP address
# in HELLO messages used to gossip its presence, instead of auto-detecting the
# local address as it usually does.
#
# Similarly when announce-port is provided and is valid and non-zero, Sentinel
# will announce the specified TCP port.
#
# The two options don't need to be used together, if only announce-ip is
# provided, the Sentinel will announce the specified IP and the server port
# as specified by the "port" option. If only announce-port is provided, the
# Sentinel will announce the auto-detected local IP and the specified port.
#
# Example:
#
# sentinel announce-ip 1.2.3.4
# dir <working-directory>
# Every long running process should have a well-defined working directory.
# For Redis Sentinel to chdir to /tmp at startup is the simplest thing
# for the process to don't interfere with administrative tasks such as
# unmounting filesystems.
dir "/var/lib/redis/26379"
logfile "/var/log/redis/sentinel-26379"
# sentinel monitor <master-name> <ip> <redis-port> <quorum>
#
# Tells Sentinel to monitor this master, and to consider it in O_DOWN
# (Objectively Down) state only if at least <quorum> sentinels agree.
#
# Note that whatever is the ODOWN quorum, a Sentinel will require to
# be elected by the majority of the known Sentinels in order to
# start a failover, so no failover can be performed in minority.
#
# Slaves are auto-discovered, so you don't need to specify slaves in
# any way. Sentinel itself will rewrite this configuration file adding
# the slaves using additional configuration options.
# Also note that the configuration file is rewritten when a
# slave is promoted to master.
#
# Note: master name should not include special characters or spaces.
# The valid charset is A-z 0-9 and the three characters ".-_".
sentinel myid 1b51aae574d721222f63a84c37d83c9361b2f16b
sentinel monitor master3 192.168.1.11 7005 2
sentinel config-epoch master3 0
# sentinel auth-pass <master-name> <password>
#
# Set the password to use to authenticate with the master and slaves.
# Useful if there is a password set in the Redis instances to monitor.
#
# Note that the master password is also used for slaves, so it is not
# possible to set a different password in masters and slaves instances
# if you want to be able to monitor these instances with Sentinel.
#
# However you can have Redis instances without the authentication enabled
# mixed with Redis instances requiring the authentication (as long as the
# password set is the same for all the instances requiring the password) as
# the AUTH command will have no effect in Redis instances with authentication
# switched off.
#
# Example:
#
# sentinel auth-pass mymaster MySUPER--secret-0123passw0rd
# sentinel down-after-milliseconds <master-name> <milliseconds>
#
# Number of milliseconds the master (or any attached slave or sentinel) should
# be unreachable (as in, not acceptable reply to PING, continuously, for the
# specified period) in order to consider it in S_DOWN state (Subjectively
# Down).
#
# Default is 30 seconds.
sentinel leader-epoch master3 0
sentinel known-slave master3 192.168.1.11 7006
sentinel known-sentinel master3 192.168.1.114 36379 d6c381864488fdb81db2a86b939fac57ba2345bc
# sentinel parallel-syncs <master-name> <numslaves>
#
# How many slaves we can reconfigure to point to the new slave simultaneously
# during the failover. Use a low number if you use the slaves to serve query
# to avoid that all the slaves will be unreachable at about the same
# time while performing the synchronization with the master.
sentinel known-sentinel master3 192.168.1.114 46379 29538ea65975d208004a1dcc85fc2eed8fa71ab5
sentinel monitor master1 192.168.1.233 7001 2
sentinel config-epoch master1 0
# sentinel failover-timeout <master-name> <milliseconds>
#
# Specifies the failover timeout in milliseconds. It is used in many ways:
#
# - The time needed to re-start a failover after a previous failover was
# already tried against the same master by a given Sentinel, is two
# times the failover timeout.
#
# - The time needed for a slave replicating to a wrong master according
# to a Sentinel current configuration, to be forced to replicate
# with the right master, is exactly the failover timeout (counting since
# the moment a Sentinel detected the misconfiguration).
#
# - The time needed to cancel a failover that is already in progress but
# did not produced any configuration change (SLAVEOF NO ONE yet not
# acknowledged by the promoted slave).
#
# - The maximum time a failover in progress waits for all the slaves to be
# reconfigured as slaves of the new master. However even after this time
# the slaves will be reconfigured by the Sentinels anyway, but not with
# the exact parallel-syncs progression as specified.
#
# Default is 3 minutes.
sentinel leader-epoch master1 0
sentinel known-slave master1 192.168.1.254 7004
# SCRIPTS EXECUTION
#
# sentinel notification-script and sentinel reconfig-script are used in order
# to configure scripts that are called to notify the system administrator
# or to reconfigure clients after a failover. The scripts are executed
# with the following rules for error handling:
#
# If script exits with "1" the execution is retried later (up to a maximum
# number of times currently set to 10).
#
# If script exits with "2" (or an higher value) the script execution is
# not retried.
#
# If script terminates because it receives a signal the behavior is the same
# as exit code 1.
#
# A script has a maximum running time of 60 seconds. After this limit is
# reached the script is terminated with a SIGKILL and the execution retried.
# NOTIFICATION SCRIPT
#
# sentinel notification-script <master-name> <script-path>
#
# Call the specified notification script for any sentinel event that is
# generated in the WARNING level (for instance -sdown, -odown, and so forth).
# This script should notify the system administrator via email, SMS, or any
# other messaging system, that there is something wrong with the monitored
# Redis systems.
#
# The script is called with just two arguments: the first is the event type
# and the second the event description.
#
# The script must exist and be executable in order for sentinel to start if
# this option is provided.
#
# Example:
#
# sentinel notification-script mymaster /var/redis/notify.sh
# CLIENTS RECONFIGURATION SCRIPT
#
# sentinel client-reconfig-script <master-name> <script-path>
#
# When the master changed because of a failover a script can be called in
# order to perform application-specific tasks to notify the clients that the
# configuration has changed and the master is at a different address.
#
# The following arguments are passed to the script:
#
# <master-name> <role> <state> <from-ip> <from-port> <to-ip> <to-port>
#
# <state> is currently always "failover"
# <role> is either "leader" or "observer"
#
# The arguments from-ip, from-port, to-ip, to-port are used to communicate
# the old address of the master and the new address of the elected slave
# (now a master).
#
# This script should be resistant to multiple invocations.
#
# Example:
#
# sentinel client-reconfig-script mymaster /var/redis/reconfig.sh
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启动sentinel服务
cd /usr/local/bin
./redis-sentinel /home/redis4/redis-sentienl/26379/sentinel.conf
./redis-sentinel /home/redis4/redis-sentienl/36379/sentinel.conf
./redis-sentinel /home/redis4/redis-sentienl/46379/sentinel.conf
至此，sentinel监控集群创建完毕，日志去配置目录的/var/log/redis目录下查看
集群使用
用cli连接客户端
redis-cli -h 192.168.1.233 -c -p 7001
查看集群状态
[root@bogon bin]# redis-trib.rb info 192.168.1.233:7001
192.168.1.233:7001 (e6d97aef…) -> 0 keys | 5461 slots | 1 slaves.
192.168.1.11:7005 (027540bf…) -> 0 keys | 5461 slots | 1 slaves.
192.168.1.254:7003 (bcf79a6d…) -> 0 keys | 5462 slots | 1 slaves.
[OK] 0 keys in 3 masters.
0.0 keys per slot on average.
当前集群环境说明
redis1 7001为master 7002 slave
redis2 7003 为 master 7004 slave
redis3 7005 为 master 7006 slave
redis4 启动三个sentinel实例监控主从节点端口分别为 26379 36379 46379
必须有两个以上的sentienl实例认为主节点挂掉，才会启动主从切换
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