基于keepalived、redis sentinel的多实例redis集群【1】---路由以及哨兵配置

硬件

机器名	IP	作用
master	192.168.0.2	redis的master服务器,两个主实例
slave1	192.168.0.3	redis的slave服务器，两个从实例
slave2	192.168.0.4	redis的slave服务器，两个从实例
route1	192.168.0.5【虚拟IP：192.168.0.7】	keepalived和redis sentinel服务器，承载写redis的VIP【虚拟ip】，做写的双机热备的主master指定，redis哨兵的安装节点1
route2	192.168.0.6【虚拟IP：192.168.0.8】	keepalived和redis sentinel服务器，承载读redis的VIP，做读的负载均衡和写的双机热备的master备份路由指定，redis哨兵的安装节点2

route1

1.安装redis在route1上，安装路径/usr/local/redis/

2.在redis安装路径下创建scripts目录，将需要的脚本复制到此处：

1	RunCmd.py	基础功能模块，提供redis服务超时检查
2	master_config_set.py	将master的save参数配置为空
3	redischeck.py	检查master的redis服务状态
4	slave_config_set.py	将slave的save参数配置为特定值
5	weightchange.py	调整读的redis服务在keepalived的权重

详细的keepalived配置，

! Configuration File for keepalived

global_defs {
   notification_email {
     接收邮箱   
   }
   notification_email_from 发送邮箱
   smtp_server 邮件服务器
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_instance VI_1 {
    state MASTER
    interface eth1
    lvs_sync_daemon_inteface eth1
    virtual_router_id 100
    priority 160
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }    
    virtual_ipaddress {
        192.168.0.7
    }         
}
vrrp_instance VI_2 {
    state BACKUP
    interface eth1
    lvs_sync_daemon_inteface eth1
    virtual_router_id 101
    priority 100
    advert_int 1
    authentication {
	auth_type PASS
	auth_pass 1111
    }
    virtual_ipaddress {
	192.168.0.
    }
}
virtual_server 192.168.0.7 6379 {
	delay_loop 3
	lb_algo rr
	lb_kind DR
	#nat_mask 255.255.255.0
	persistence_timeout 15
	protocol TCP
	real_server 192.168.0.2 6379 {
		weight 8
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.2 6379"
		MISC_CHECK { 
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.2 6379"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.3 6379 {
		weight 3
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.3 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.3 6379"
		misc_timeout 5
		misc_dynamic
		} 
	}
	real_server 192.168.0.4 6379 {
		weight 3
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.4 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.4 6379"
		misc_timeout 5
		msic_dynamic
		}
	}
}
virtual_server 192.168.0.7 6380 {
	delay_loop 3
	lb_algo rr
	lb_kind DR
	#nat_mask 255.255.255.0
	persistence_timeout 15
	protocol TCP
	real_server 192.168.0.2 6380 {
		weight 8
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.2 6380"
		MISC_CHECK { 
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.2 6380"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.3 6380 {
		weight 3
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.3 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.3 6380"
		misc_timeout 5
		misc_dynamic
		} 
	}
	real_server 192.168.0.4 6380 {
		weight 3
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.4 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.4 6380"
		misc_timeout 5
		msic_dynamic
		}
	}
}
virtual_server 192.168.0.8 6379 {
	delay_loop 3
	lb_algo wrr
	lb_kind DR
	persistence_timeout 30
	protocol TCP
	real_server 192.168.0.2 6379 {
		weight 6
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.2 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.2 6379"
		misc_timeout 5
		misc_dynamic
		}
	} 
	real_server 192.168.0.3 6379 {
		weight 2
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.3 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.3 6379"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.4 6379 {
		weight 2
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.4 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.4 6379"
		misc_timeout 5
		misc_dynamic
		}
	}
}
virtual_server 192.168.0.8 6380 {
	delay_loop 3
	lb_algo wrr
	lb_kind DR
	persistence_timeout 30
	protocol TCP
	real_server 192.168.0.2 6380 {
		weight 6
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.2 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.2 6380"
		misc_timeout 5
		misc_dynamic
		}
	} 
	real_server 192.168.0.3 6380 {
		weight 2
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.3 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.3 6380"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.4 6380 {
		weight 2
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.4 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.4 6380"
		misc_timeout 5
		misc_dynamic
		}
	}
}

route2的keepalived配置文件

! Configuration File for keepalived

global_defs {
   notification_email {
     接受邮箱
   }
   notification_email_from 发送邮箱
   smtp_server 邮件服务器
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth1
    lvs_sync_daemon_inteface eth1
    virtual_router_id 100
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }    
    virtual_ipaddress {
        192.168.0.7
    }     
}
vrrp_instance VI_2 {
    state MASTER
    interface eth1
    lvs_sync_daemon_inteface eth1
    virtual_router_id 101
    priority 151
    advert_int 1
    authentication {
	auth_type PASS
	auth_pass 1111
    }
    virtual_ipaddress {
	 192.168.0.8
    }
}
virtual_server 192.168.0.7 6379 {
	delay_loop 3
	lb_algo rr
	lb_kind DR
	persistence_timeout 15
	protocol TCP
	real_server 192.168.0.2 6379 {
		weight 8
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.2 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.2 6379"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.3 6379 {
		weight 3
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.3 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.3 6379"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.4 6379 {
		weight 3
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.4 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.4 6379"
		misc_timeout 5
		misc_dynamic
		}
	}
}
virtual_server 192.168.0.7 6380 {
	delay_loop 3
	lb_algo rr
	lb_kind DR
	persistence_timeout 15
	protocol TCP
	real_server 192.168.0.2 6380 {
		weight 8
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.2 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.2 6380"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.3 6380 {
		weight 3
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.3 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.3 6380"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.4 6380 {
		weight 3
		notify_up "/usr/local/redis/scripts/master_config_set.py 192.168.0.4 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/redischeck.py 192.168.0.4 6380"
		misc_timeout 5
		misc_dynamic
		}
	}
}
virtual_server 192.168.0.8 6379 {
	delay_loop 3
	lb_algo wrr
	lb_kind DR
	persistence_timeout 30
	protocol TCP
	real_server 192.168.0.2 6379 {
		weight 1
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.2 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.2 6379"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.3 6379 {
		weight 2
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.3 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.3 6379"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.4 6379 {
		weight 2
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.4 6379"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.4 6379"
		misc_timeout 5
		misc_dynamic
		}
	}
}
virtual_server 192.168.0.8 6380 {
	delay_loop 3
	lb_algo wrr
	lb_kind DR
	persistence_timeout 30
	protocol TCP
	real_server 192.168.0.2 6380 {
		weight 1
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.2 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.2 6380"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.3 6380 {
		weight 2
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.3 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.3 6380"
		misc_timeout 5
		misc_dynamic
		}
	}
	real_server 192.168.0.4 6380 {
		weight 2
		notify_up "/usr/local/redis/scripts/slave_config_set.py 192.168.0.4 6380"
		MISC_CHECK {
		misc_path "/usr/local/redis/scripts/weightchange.py 192.168.0.4 6380"
		misc_timeout 5
		misc_dynamic
		}
	}
}

在keepalived使用的脚本

RunCmd.py

#!/usr/bin/python
import os;  
import sys;  
import time;  
import fcntl;  
import select;  
import signal;  
import commands;  
import subprocess; 
class RunCmd:  
    def __init__(self):  
        pass;   
    
    def Run(self,ip,port, nTimeOut = 0, nIntervalTime = 0.1):  
        lsCmd=['/usr/local/redis/bin/redis-cli','-h',ip,'-p',port,'ping']
        oProc = subprocess.Popen(lsCmd, stdout =subprocess.PIPE, stderr = subprocess.PIPE)  
        istimeout=False
        nStartTime = time.time()          
        while True:  
            time.sleep(nIntervalTime)   
            print("1:") 
            print(oProc.poll())
            if None != oProc.poll():  
                break;            
            if (nTimeOut > 0) and (time.time() - nStartTime) > nTimeOut:
                istimeout=True                 
                break; 
        print("2:") 
        print(istimeout) 
        if istimeout: 
            print(oProc.poll()) 
            if None == oProc.poll():  
                self.KillAll(oProc.pid)  
        print("3:") 
        print(istimeout)
        return istimeout
  
    def KillAll(self, nKillPid, nKillSignal = signal.SIGKILL):  
        nRet, strOutput = commands.getstatusoutput("kill "+str(nKillPid));#as root run         
        return (True, strOutput)

master_config_set.py脚本

#!/usr/bin/python
from RunCmd import RunCmd
import sys,commands
oCmd = RunCmd();  
istimeout = oCmd.Run(sys.argv[1],sys.argv[2], 0.1)
if not istimeout:
    cmd="/usr/local/redis/bin/redis-cli -h "+sys.argv[1]+" -p "+sys.argv[2]+" info"
    str=commands.getoutput(cmd)
    ismaster=str.count("role:master")
    zero=0
    if ismaster>zero:
        t=commands.getoutput("/usr/local/redis/bin/redis-cli -h "+sys.argv[1]+" -p "+sys.argv[2]+" config set save \"\"")
        print t

slave_config_set.py

#!/usr/bin/python
from RunCmd import RunCmd
import sys,commands
oCmd = RunCmd();  
istimeout = oCmd.Run(sys.argv[1],sys.argv[2], 0.1)
if not istimeout:
    cmd="/usr/local/redis/bin/redis-cli -h "+sys.argv[1]+" -p "+sys.argv[2]+" info"
    str=commands.getoutput(cmd)
    isslave=str.count("role:slave")
    zero=0
    if isslave>zero:
        t=commands.getoutput("/usr/local/redis/bin/redis-cli -h "+sys.argv[1]+" -p "+sys.argv[2]+" config set save \"90 1 300 10 60 1000\"")
        print t

redischeck.py

#!/usr/bin/python
from RunCmd import RunCmd
import sys,commands
oCmd = RunCmd();  
istimeout = oCmd.Run(sys.argv[1],sys.argv[2], 0.1)
if not istimeout:
	cmd="/usr/local/redis/bin/redis-cli -h "+sys.argv[1]+" -p "+sys.argv[2]+" info"
	str=commands.getoutput(cmd)	
	ismaster=str.count("role:master")
	zero=0
	if ismaster>zero:
	  sys.exit(0)
	else:
	  sys.exit(1)
else:
	sys.exit(1)

weightchange.py

#!/usr/bin/python
from RunCmd import RunCmd
import sys,commands
oCmd = RunCmd();  
istimeout = oCmd.Run(sys.argv[1],sys.argv[2], 0.1)
if not istimeout:
	result=1
	cmd="/usr/local/redis/bin/redis-cli -h "+sys.argv[1]+" -p "+sys.argv[2]+" ping"
	strping=commands.getoutput(cmd)
	zero=0
	ispong=-100
	ispong=strping.count("PONG")
	if ispong>zero:
		result=0
	if result>zero:
		sys.exit(1)
	else:
		cmdmaster="/usr/local/redis/bin/redis-cli -h "+sys.argv[1]+" -p "+sys.argv[2]+" info"
		str=commands.getoutput(cmdmaster)
		ismaster=-100
		ismaster=str.count("role:master")
		if ismaster>zero:
		  sys.exit(3)
		else:
		  sys.exit(10)
else:
	sys.exit(1)

redis的哨兵的配置文件sentinel.conf

# Example sentinel.conf

# port <sentinel-port>
# The port that this sentinel instance will run on
port 26379

# sentinel monitor <master-name> <ip> <redis-port> <quorum>
#
# Tells Sentinel to monitor this slave, and to consider it in O_DOWN
# (Objectively Down) state only if at least <quorum> sentinels agree.
#
# Note: master name should not include special characters or spaces.
# The valid charset is A-z 0-9 and the three characters ".-_".
sentinel monitor mymaster 192.168.0.2 6379 2
sentinel monitor mymaster6380 192.168.0.2 6380 2
# 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 down-after-milliseconds mymaster 3800
sentinel down-after-milliseconds mymaster6380 3800
# sentinel can-failover <master-name> <yes|no>
#
# Specify if this Sentinel can start the failover for this master.
sentinel can-failover mymaster yes
sentinel can-failover mymaster6380 yes
# 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 parallel-syncs mymaster 1
sentinel parallel-syncs mymaster6380 1
# sentinel failover-timeout <master-name> <milliseconds>
#
# Specifies the failover timeout in milliseconds. When this time has elapsed
# without any progress in the failover process, it is considered concluded by
# the sentinel even if not all the attached slaves were correctly configured
# to replicate with the new master (however a "best effort" SL***EOF command
# is sent to all the slaves before).
#
# Also when 25% of this time has elapsed without any advancement, and there
# is a leader switch (the sentinel did not started the failover but is now
# elected as leader), the sentinel will continue the failover doing a
# "takeover".
#
# Default is 15 minutes.
sentinel failover-timeout mymaster 90000
sentinel failover-timeout mymaster6380 90000
# 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 exists with "1" the execution is retried later (up to a maximum
# number of times currently set to 10).
#
# If script exists 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 sentienl 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 failover starts, ends, or is aborted, 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 script is called in the following cases:
#
# Failover started (a slave is already promoted)
# Failover finished (all the additional slaves already reconfigured)
# Failover aborted (in that case the script was previously called when the
#                   failover started, and now gets called again with swapped
#                   addresses).
#
# The following arguments are passed to the script:
#
# <master-name> <role> <state> <from-ip> <from-port> <to-ip> <to-port>
#
# <state> is "start", "end" or "abort"
# <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) in the case state is "start" or "end".
#
# For abort instead the "from" is the address of the promoted slave and
# "to" is the address of the original master address, since the failover
# was aborted.
#
# This script should be resistant to multiple invocations.
#
# Example:
#
# sentinel client-reconfig-script mymaster /var/redis/reconfig.sh

在两个route上修改/etc/sysctl.conf文件

net.ipv4.ip_forward=1#转发开启

执行sysctl -p让文件起效

有防火墙需要设置防火墙转发