【README】 redis集群添加節點報錯

[ERR] Node 192.168.163.202:6380 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.??

【1】 原因

導致異常的主要原因是該節點中默認生成的配置或歷史存儲數據不一致導致的，清除對應節點的dump.rdb、nodes.conf文件，重啟之后即可。

dump.rdb是由Redis服務器自動生成的 默認情況下 每隔一段時間redis服務器程序會自動對數據庫做一次遍歷，把內存快照寫在一個叫做“dump.rdb”的文件里，這個持久化機制叫做SNAPSHOT。有了SNAPSHOT后，如果服務器宕機，重新啟動redis服務器程序時redis會自動加載dump.rdb，將數據庫狀態恢復到上一次做SNAPSHOT時的狀態。

【2】解決步驟：

1、停止服務，刪除aof/rdb文件；
2、刪除nodes.conf
3、必要的情況下執行flushdb。
原文鏈接：?http://www.choupangxia.com/2019/11/07/redis-node-is-not-empty/?

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【3】報錯現場和實際解決方法??

1）?把 202:6380 添加到 機器201:6379所在集群，集群master節點的hash為 5571f088f9d8798dd0c2e973ced830c2cd8033a2??

[root@centos201 ~]# /usr/local/redis-cluster/bin/redis-trib.rb add-node --slave --master-id 5571f088f9d8798dd0c2e973ced830c2cd8033a2 192.168.163.202:6380 192.168.163.201:6379 >>> Adding node 192.168.163.202:6380 to cluster 192.168.163.201:6379 Connecting to node 192.168.163.201:6379: OK Connecting to node 192.168.163.203:6379: OK Connecting to node 192.168.163.202:6379: OK >>> Performing Cluster Check (using node 192.168.163.201:6379) M: 5571f088f9d8798dd0c2e973ced830c2cd8033a2 192.168.163.201:6379slots:0-5460 (5461 slots) master0 additional replica(s) M: 5c0ea563b464e58dd8dc9722cdfcb97a85c44714 192.168.163.203:6379slots:10923-16383 (5461 slots) master0 additional replica(s) M: 99a3516a03612dba4b73c32e7e1e03ff1145a660 192.168.163.202:6379slots:5461-10922 (5462 slots) master0 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. Connecting to node 192.168.163.202:6380: OK [ERR] Node 192.168.163.202:6380 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.

補充： 對以上命令的說明，?命令作用：為redis集群添加節點 ，?把 202:6380 添加到 機器201:6379所在集群，集群master節點的hash為 5571f088f9d8798dd0c2e973ced830c2cd8033a2

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2）停止202:6380 redis服務，并在202:6380機器上刪除 redis aof文件， nodes.conf 文件； 最后重新啟動 202:6380 redis服務

[root@centos202 ~]# ps -ef | grep redis root 1665 1 0 21:17 ? 00:00:09 /usr/local/bin/redis-server 192.168.163.202:6379 [cluster] root 1669 1 0 21:17 ? 00:00:07 /usr/local/bin/redis-server 192.168.163.202:6380 [cluster] root 1673 1 0 21:17 ? 00:00:07 /usr/local/bin/redis-server 192.168.163.202:6381 [cluster] root 1796 1694 0 23:04 pts/1 00:00:00 grep --color=auto redis [root@centos202 ~]# [root@centos202 ~]# kill -9 1669 [root@centos202 ~]# [root@centos202 ~]# ps -ef | grep redis root 1665 1 0 21:17 ? 00:00:09 /usr/local/bin/redis-server 192.168.163.202:6379 [cluster] root 1673 1 0 21:17 ? 00:00:07 /usr/local/bin/redis-server 192.168.163.202:6381 [cluster] root 1799 1694 0 23:06 pts/1 00:00:00 grep --color=auto redis [root@centos202 ~]# [root@centos202 6380]# cd data/ [root@centos202 data]# ll total 4 -rw-r--r--. 1 root root 0 Feb 18 21:17 appendonly.aof -rw-r--r--. 1 root root 229 Feb 18 22:49 nodes-6380.conf [root@centos202 data]# rm appendonly.aof rm: remove regular empty file 'appendonly.aof'? y [root@centos202 data]# ll total 4 -rw-r--r--. 1 root root 229 Feb 18 22:49 nodes-6380.conf [root@centos202 data]# rm -rf nodes-6380.conf [root@centos202 data]# ll total 0 [root@centos202 data]# [root@centos202 data]# /usr/local/bin/redis-server /usr/local/redis-cluster/6380/redis.conf [root@centos202 data]# [root@centos202 data]# ps -ef | grep redis root 1665 1 0 21:17 ? 00:00:10 /usr/local/bin/redis-server 192.168.163.202:6379 [cluster] root 1673 1 0 21:17 ? 00:00:07 /usr/local/bin/redis-server 192.168.163.202:6381 [cluster] root 1808 1 43 23:07 ? 00:00:01 /usr/local/bin/redis-server 192.168.163.202:6380 [cluster] root 1812 1694 0 23:07 pts/1 00:00:00 grep --color=auto redis

3） 再次把 202:6380 添加到 機器201:6379所在集群

[root@centos201 ~]# /usr/local/redis-cluster/bin/redis-trib.rb add-node --slave --master-id 5571f088f9d8798dd0c2e973ced830c2cd8033a2 192.168.163.202:6380 192.168.163.201:6379 >>> Adding node 192.168.163.202:6380 to cluster 192.168.163.201:6379 Connecting to node 192.168.163.201:6379: OK Connecting to node 192.168.163.203:6379: OK Connecting to node 192.168.163.202:6379: OK >>> Performing Cluster Check (using node 192.168.163.201:6379) M: 5571f088f9d8798dd0c2e973ced830c2cd8033a2 192.168.163.201:6379slots:0-5460 (5461 slots) master0 additional replica(s) M: 5c0ea563b464e58dd8dc9722cdfcb97a85c44714 192.168.163.203:6379slots:10923-16383 (5461 slots) master0 additional replica(s) M: 99a3516a03612dba4b73c32e7e1e03ff1145a660 192.168.163.202:6379slots:5461-10922 (5462 slots) master0 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. Connecting to node 192.168.163.202:6380: OK >>> Send CLUSTER MEET to node 192.168.163.202:6380 to make it join the cluster. Waiting for the cluster to join. >>> Configure node as replica of 192.168.163.201:6379. [OK] New node added correctly.

bingo 添加成功。

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