Redis集羣宕機恢復集羣狀態

一、問題簡述

1. 最近在修復Redis環境漏洞過程中，修改了其中一臺linux主機上的兩個Redis結點的配置文件，導致後續結點重啓失敗。

二、部署方式

1. 使用三臺不同的linux主機來完成Redis6個結點的部署(三主三從)。
2. 由下圖所示

host	port	nodeType
111.229.96.162	7000/7001	master/slaver
111.229.96.163	7002/7003	slaver/slaver
111.229.96.164	7004/7005	master/master

3. 結點類型可通過如下命令查看

#redis連接   -c：以集羣的方式連接 -h：主機ip地址 -p：ip端口
#錯誤演示 
[ml@inmshgis13 src]$ ./redis-cli -h 111.229.96.164 -p 7005
111.229.96.164:7005> get name
(error) MOVED 5798 111.229.96.164:7005
// 最好是加上-c
[ml@inmshgis13 src]$ ./redis-cli -c -h 111.229.96.164 -p 7005
111.229.96.164:7005> info replication
# Replication
role:slave
master_host:111.229.96.164
master_port:7005
master_link_status:up
master_last_io_seconds_ago:0
master_sync_in_progress:0
slave_repl_offset:2728687610
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:33049affb1e8c1cc3cc54e0250532a94c921e78e
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:2728687610
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2727639035
repl_backlog_histlen:1048576

三、啓動步驟
/gis/redis/redis/redis_cluster/7000

1. 分別啓動三臺linux主機上的redis結點

[ml@inmshgis13 ~]$ cd /gis/redis/redis/src
[ml@inmshgis13 src]$ ./redis-server /gis/redis/redis/redis_cluster/7000/redis.conf
[ml@inmshgis13 src]$ ./redis-server /gis/redis/redis/redis_cluster/7001/redis.conf
...

2. 生成集羣

[ml@inmshgis13 src]$ ./redis-trib.rb create --replicas 1 111.229.96.162:7000 111.229.96.162:7001 111.229.96.163:7002 111.229.96.163:7003 111.229.96.164:7004 111.229.96.164:7005

3. 查看集羣狀態

111.229.96.164:7005> cluster info
cluster_state:ok  //集羣啓動成功標誌 失敗爲fail
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:14
cluster_my_epoch:5
cluster_stats_messages_ping_sent:87052
cluster_stats_messages_pong_sent:83735
cluster_stats_messages_sent:170787
cluster_stats_messages_ping_received:83735
cluster_stats_messages_pong_received:87052
cluster_stats_messages_received:170787