redis从节点slave,fail,noaddr问题处理

最新推荐文章于 2025-01-16 15:48:58 发布

雅冰石

最新推荐文章于 2025-01-16 15:48:58 发布

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分类专栏： Redis 学习

本文链接：https://blog.youkuaiyun.com/yabingshi_tech/article/details/114564494

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本文介绍了一个Redis集群中从节点出现故障的具体情况，并提供了详细的解决步骤，包括如何将故障节点从集群中移除、重新加入集群及配置主从关系。

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一问题描述

查看集群状态，发现其中一个从节点异常(是fail状态)
127.0.0.1:6383> cluster nodes

83780e418e90de6067a196d88a54fd2cfe719f86 192.168.109.134:6384@16384 slave 6a50a9c515acf3490e5a5256250d857d0812bc6a 0 1615173819865 17 connected

00dd345835790608dc062dd4742d853138f06b97 192.168.109.133:6384@16384 master - 0 1615173819000 9 connected 5462-10923

0e8fa73711c300f2da6f92df49b215d270021b14 192.168.109.134:6383@16383 slave 00dd345835790608dc062dd4742d853138f06b97 0 1615173818862 9 connected

f86464011d9f8ec605857255c0b67cff1e794c19 :0@0 slave,fail,noaddr 2cb35944b4492748a8c739fab63a0e90a56e414a 1614958275942 1614958275942 8 disconnected

6a50a9c515acf3490e5a5256250d857d0812bc6a 192.168.109.132:6384@16384 master - 0 1615173818000 17 connected 10924-16383

2cb35944b4492748a8c739fab63a0e90a56e414a 192.168.109.133:6383@16383 myself,master - 0 1615173819000 8 connected 0-5461

在问题节点上查看节点状态，发现它已脱离集群，且id都已发生了变化：

127.0.0.1:6383> cluster nodes

0cbf44ef3f9c3a8a473bcd303644388782e5ee78 192.168.109.132:6383@16383 myself,master - 0 0 0 connected 0-5461

/*若id没发生变化，直接重启下该从节点就能解决*/

二解决办法

2.1 将该从节点剔出集群

#在集群每个正常节点上执行cluster forget 故障从节点id，示例：

echo 'cluster forget f86464011d9f8ec605857255c0b67cff1e794c19' | /usr/local/bin/redis-cli -p 6384 -a "密码"

echo 'cluster nodes' | /usr/local/bin/redis-cli -p 6384 -a "密码"

echo 'cluster forget f86464011d9f8ec605857255c0b67cff1e794c19' | /usr/local/bin/redis-cli -p 6383 -a "密码"

echo 'cluster nodes' | /usr/local/bin/redis-cli -p 6383 -a "密码"

2.2 重新将该节点加入集群

2.2.1 握手

在集群内任意节点上执行cluster meet命令加入新节点，握手状态会通过信息在集群内传播，这样其他节点会自动发现新节点并发起握手流程。

echo 'cluster meet 192.168.109.132 6383' | /usr/local/bin/redis-cli -p 6384 -a "密码"

2.2.2 配置主从关系

#在该从节上执行cluster replicate 主节点id

[root@centos7-mod ~]# echo 'cluster replicate 2cb35944b4492748a8c739fab63a0e90a56e414a' | /usr/local/bin/redis-cli -p 6383 -a "密码"

Warning: Using a password with '-a' option on the command line interface may not be safe.

2.2.3 检查集群状态

[root@centos7-mod ~]# echo 'cluster nodes' | /usr/local/bin/redis-cli -p 6384 -a "密码"

Warning: Using a password with '-a' option on the command line interface may not be safe.

38287a7e715c358b5537a369646e9698a7583459 192.168.109.132:6383@16383 slave 2cb35944b4492748a8c739fab63a0e90a56e414a 0 1615233239757 8 connected

2cb35944b4492748a8c739fab63a0e90a56e414a 192.168.109.133:6383@16383 master - 0 1615233239000 8 connected 0-5461

0e8fa73711c300f2da6f92df49b215d270021b14 192.168.109.134:6383@16383 slave 00dd345835790608dc062dd4742d853138f06b97 0 1615233241763 9 connected

83780e418e90de6067a196d88a54fd2cfe719f86 192.168.109.134:6384@16384 slave 6a50a9c515acf3490e5a5256250d857d0812bc6a 0 1615233240760 17 connected

00dd345835790608dc062dd4742d853138f06b97 192.168.109.133:6384@16384 master - 0 1615233241000 9 connected 5462-10923

6a50a9c515acf3490e5a5256250d857d0812bc6a 192.168.109.132:6384@16384 myself,master - 0 1615233242000 17 connected 10924-16383

--本篇文章主要参考自https://blog.youkuaiyun.com/wojiuguowei/article/details/83511023