Getting to Redis distributed (eight) Redis Sentinel

Others 2019-12-03 20:45:06 views: null

sentinel- directory

        主从复制高可用
        安装配置
        实现原理
        架构说明
        客户端连接
        常见开发运维问题

A master copy from the HA

1, from the role of the primary copy?

  Mainly a backup, when the main hang server, the master server may provide complete data for the client;

  Shunt main server, onto the read operation from the node.

2, the master copy from existing availability problems?

Manual failover

Write capability and storage capacity is limited

3, manual failover:

​

As shown, if this time the master hung up, the slave master copy was also cut off, which for our customers connect master will certainly end connections or failed to read and write. This is a separate connection or read-write strategy, where the reading is normal, but the updated data is not guaranteed.

solution:

​

After more than a problem to failover. First, select a client slave, let it perform slaveof no one, let it be master; then let them slave for the rest of the execution slaveof new master to perform data synchronization to a new master, thus completing a new generation of master and the process to its replication.

At the same time, our clients will go to read the new slave master.

二、 redis sentinel

1, Redis Sentinel architecture:

​

First, Redis Sentinel redis comprising a plurality of nodes, including a primary or a plurality of nodes from a master from multiple other; also includes a plurality of sentinel nodes.

sentinel node status redis mainly used for fault determination node, a failover to redis processing and client processes the notification.

For a failed node can achieve fairness, but also to ensure high availability, because the current one sentinel node hung up, it can also ensure that the entire Senetinel structure is perfect.

2, Redis Sentinel failover:

​

  1. It found that more than Sentinel and confirmed master in question
  2. Elected as a sentinel leader
  3. Elected as a slave master
  4. Inform the rest of the slave become the new master of the slave
  5. Inform the client of the main changes from
  6. Waiting for the resurrection of the old master to become the new master of the slave

整个过程其实就是从手动故障配置转移改成由sentinel进行故障发现、故障处理转移、故障通知的机制。

​

Redis Sentinel可以进行多套master~slave的机制的监控；每套master~slave会使用一个master-name进行标识。

三、redis sentinel 安装

1、安装与配置

1）配置开启主从节点

2) 配置开启sentinel监控主节点。（sentinel是特殊的redis）

3）实际应该多机器

4）详细配置节点

2、案例：

​

有个master:master-7000,两个slave: slave-7001,slave-7002:

1）Redis主节点：

启动：

redis-server redis-7000.conf

配置：

port 7000

daemonnize yes

pidfile /var/run/redis-7000.pid

logfile "7000.log"

2) Redis从节点

启动 ：

  redis-server redis-7001.conf

  redis-server redis-7002.conf

配置：

slave-1:

port 7001

daemonnize yes

pidfile /var/run/redis-7001.pid

logfile "7001.log"

dir "/opt/soft/redis/data/"

slaveof 127.0.0.1 7000

slave-2:

port 7002

daemonnize yes

pidfile /var/run/redis-7002.pid

logfile "7002.log"

dir "/opt/soft/redis/data/"

slaveof 127.0.0.1 7000

3、sentinel主要配置

port ${port}

dir "/opt/soft/redis/data/"

logfile "${port}.log"

sentinel monitor mymaster 127.0.0.1 7000 2

sentinel down-after-milliseconds mymaster 30000

sentinel parallel-syncs mymaster 1

sentinel failover-timeout mymaster 180000

四、redis sentine安装演示1

1、配置主节点配置文件： redis-7000.conf

[root@VM_0_14_centos conf]# ll

total 0

[root@VM_0_14_centos conf]# vim redis-7000.conf

1）配置参数：

port 7000

daemonize yes

pidfile /var/run/redis-7000.pid

logfile "7000.log"

dir "/usr/local/redis/data/"

2）将redis-7000复制为从节点rediss-7001、redis-7002

[root@VM_0_14_centos conf]# sed "s/7000/7001/g" redis-7000.conf > redis-7001.conf

[root@VM_0_14_centos conf]# sed "s/7000/7002/g" redis-7000.conf > redis-7002.conf

[root@VM_0_14_centos conf]# ll

total 12

-rw-r--r-- 1 root root 106 Nov 11 14:53 redis-7000.conf

-rw-r--r-- 1 root root 106 Nov 11 14:54 redis-7001.conf

-rw-r--r-- 1 root root 106 Nov 11 14:54 redis-7002.conf

3）让redis-7001、redis-7002指向redis-7000主节点：

[root@VM_0_14_centos conf]# echo "slaveof 127.0.0.1 7000" >> redis-7001.conf

[root@VM_0_14_centos conf]#

[root@VM_0_14_centos conf]# echo "slaveof 127.0.0.1 7000" >> redis-7002.conf

[root@VM_0_14_centos conf]# ll

total 12

-rw-r--r-- 1 root root 106 Nov 11 14:53 redis-7000.conf

-rw-r--r-- 1 root root 129 Nov 11 14:55 redis-7001.conf

-rw-r--r-- 1 root root 129 Nov 11 14:55 redis-7002.conf

[root@VM_0_14_centos conf]# cat redis-7000.conf

port 7000

daemonize yes

pidfile /var/run/redis-7000.pid

logfile "7000.log"

dir "/usr/local/redis/data/"

[root@VM_0_14_centos conf]# cat redis-7001.conf

port 7001

daemonize yes

pidfile /var/run/redis-7001.pid

logfile "7001.log"

dir "/usr/local/redis/data/"

slaveof 127.0.0.1 7000

[root@VM_0_14_centos conf]# cat redis-7002.conf

port 7002

daemonize yes

pidfile /var/run/redis-7002.pid

logfile "7002.log"

dir "/usr/local/redis/data/"

slaveof 127.0.0.1 7000

2、启动主、从节点：

[root@VM_0_14_centos conf]# redis-server redis-7000.conf

[root@VM_0_14_centos conf]# redis-cli -p 7000 ping

PONG

[root@VM_0_14_centos conf]# redis-server redis-7001.conf

[root@VM_0_14_centos conf]# redis-cli -p 7001 ping

PONG

[root@VM_0_14_centos conf]# redis-server redis-7002.conf

[root@VM_0_14_centos conf]# redis-cli -p 7002 ping

PONG

3、查看主从节点端口及相关配置信息：

​

五、 redis sentinel 安装2

安装配置redis-sentinel：

1、创建sentinel.conf文件：

port 26379

dir /tmp

sentinel monitor mymaster 192.168.1.108 6379 2

sentinel auth-pass mymaster MySUPER--secret-0123passw0rd

sentinel down-after-milliseconds mymaster 30000

sentinel parallel-syncs mymaster 1

sentinel failover-timeout mymaster 180000

2、复制创建 redis-sentinel-26379.conf文件：

cat sentinel.conf | grep -v "#" | grep -v "^$" > redis-sentinel-26379.conf

3、主节点参数配置：

port 26379

daemonize yes

dir /usr/local/redis/data/

logfile "26379.log"

sentinel monitor mymaster 127.0.0.1 7000 2

sentinel down-after-milliseconds mymaster 30000

sentinel parallel-syncs mymaster 1

sentinel failover-timeout mymaster 180000

4、启动redis-sentinel-26379主节点：

[root@VM_0_14_centos conf]# /usr/bin/redis-sentinel redis-sentinel-26379.conf

5、查看主节点状态：

[root@VM_0_14_centos conf]# ps -ef | grep redis-sentinel

root     31610     1  0 15:31 ?        00:00:00 /usr/bin/redis-sentinel *:26379 [sentinel]

root     31699 25301  0 15:32 pts/0    00:00:00 grep --color=auto redis-sentinel

6、从sentinel端口26379启动:

[root@VM_0_14_centos conf]# redis-cli -p 26379

127.0.0.1:26379>

7、为两个从节点配置sentinel:

[root@VM_0_14_centos conf]# sed "s/26379/26380/g" redis-sentinel-26379.conf > redis-sentinel-26380.conf

[root@VM_0_14_centos conf]# sed "s/26379/26381/g" redis-sentinel-26379.conf > redis-sentinel-26381.conf

8、启动从节点的sentinel:

[root@VM_0_14_centos conf]# /usr/bin/redis-sentinel redis-sentinel-26380.conf

[root@VM_0_14_centos conf]# /usr/bin/redis-sentinel redis-sentinel-26381.conf

9、状态查看；

[root@VM_0_14_centos conf]# ps -ef | grep redis-sentinel

root     31610     1  0 15:31 ?        00:00:00 /usr/bin/redis-sentinel *:26379 [sentinel]

root     32545     1  0 15:38 ?        00:00:00 /usr/bin/redis-sentinel *:26380 [sentinel]

root     32556     1  0 15:38 ?        00:00:00 /usr/bin/redis-sentinel *:26381 [sentinel]

root     32582 25301  0 15:38 pts/0    00:00:00 grep --color=auto redis-sentinel

[root@VM_0_14_centos conf]# redis-cli -p 26381127.0.0.1:26381> info# Server

redis_version:3.0.7

redis_git_sha1:00000000

redis_git_dirty:0

redis_build_id:d709ac81eddea5b3

redis_mode:sentinel

os:Linux 4.9.87-linuxkit-aufs x86_64

arch_bits:64

multiplexing_api:epoll

gcc_version:4.8.5

process_id:202

run_id:0120cece7bbd3c8c6ae3f7c8530e7608efda863e

tcp_port:26381

uptime_in_seconds:62

uptime_in_days:0

hz:16

lru_clock:14510388

config_file:/opt/soft/redis-3.0.7/config/redis-sentinel-26381.conf

# Sentinel

sentinel_masters:1

sentinel_tilt:0

sentinel_running_scripts:0

sentinel_scripts_queue_length:0

master0:name=mymaster,status=ok,address=127.0.0.1:7000,slaves=2,sentinels=3

[root@VM_0_14_centos conf]# redis-cli -p 26380 info sentinel# Sentinel

sentinel_masters:1

sentinel_tilt:0

sentinel_running_scripts:0

sentinel_scripts_queue_length:0

master0:name=mymaster,status=ok,address=127.0.0.1:7000,slaves=2,sentinels=3

六、 java 客服端

  • 请求响应流程
  • Jedis
  • Redis-py
  • 直连？

1.服务高可用？

2.客户端高可用？

1、客户端实现基本原理-step1

​

首先，我们要获取所有的sentinel节点，因为我们不知道哪个sentinel节点是活的，哪个sentnel节点已经宕机，所以我们要获取所有的sentinel节点的集合。同时，我要获取所以的master，就需要获取所有的master-name。

然后去遍历sentinel集合，找到可用的sentinel节点，也就是可以被ping通的节点。

2、客户端实现基本原理-step2

​

通过sentinel节点的集合和masterName去sentine-k中去查询并返回可用master节点的真正可用信息。

3、客户端实现基本原理-step3

​

当我们的客户端获取到master节点的时候，它会执行一次role或rol replication进行一次验证，从而验证该节点是否是真的master节点

​

If the master node changes, then, sentinel is perceived. Because who is the real master, it is for him to decide.

Sentinel mechanism and clients notice: they are to achieve the internal use of the publish-subscribe manner.

​

4, the UE access procedure:

  1) Sentinel Address Collection

  2）masterName

  3) is not a proxy mode

5, Jedis use:

JedisSentinelPool senntinelPool = new JedisSentinelPool(masterName,sentinelSet,poolConfig,timeout);
Jedis jedis = null;
try {
    jedis = redisSentinelPool.getResource();
    //jedis command
}catch(Exception e){ logger.error(e.getMessage(),e); }finally( if(jedis != null) jedis.close(): }

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Origin www.cnblogs.com/wushaopei/p/11979123.html
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