redis创建集群时卡在Waiting for the cluster to join......的解决方法

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原创 2023-10-25 18:12:27 1.3k 阅读 AI 写同款· GEO 优化 ›

Redis集群搭建“卡住”之谜：从“Waiting for the cluster to join”到端口全解析本文深入解析Redis集群搭建过程中常见的'Waiting for the cluster to join'问题，揭示其根本原因是集群总线端口未开放。详细介绍了Redis的双端口机制，包括客户端端口和集群总线端口的作用及计算规则，并提供了完整的故障排查指南和集群搭建最佳实践，帮助开发者高效解决Redis集群部署难题。阅读详情

1.问题引入

今天使用docker来部署redis集群时，发现命令执行一直卡住

redis-cli --cluster create 172.38.0.11:6379 172.38.0.12:6379 172.38.0.13:6379 172.38.0.14:6379 172.38.0.15:6379 172.38.0.16:6379 --cluster-replicas 1

/data # redis-cli --cluster create 172.38.0.11:6379 172.38.0.12:6379 172.38.0.13:6379 172.38.0.14:6379 172.38.0.15:6379 172.38.0.16:6379 --cluster-replicas 1
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 172.38.0.15:6379 to 172.38.0.11:6379
Adding replica 172.38.0.16:6379 to 172.38.0.12:6379
Adding replica 172.38.0.14:6379 to 172.38.0.13:6379
M: 0c6b4100491f58e7a6307140fe75a311d18a8ca2 172.38.0.11:6379
   slots:[0-5460] (5461 slots) master
M: 9e00fce0f3d46a84e90a345e0a49bd3b6b83f0de 172.38.0.12:6379
   slots:[5461-10922] (5462 slots) master
M: a9ee9a3f378c96122464acf266eaa4d5a461dc06 172.38.0.13:6379
   slots:[10923-16383] (5461 slots) master
S: e3a33f10cf128eceeb392d472c9f5e4f5cf05fce 172.38.0.14:6379
   replicates a9ee9a3f378c96122464acf266eaa4d5a461dc06
S: d519e4a874ce61465653d468dc7e6c64b7c3b573 172.38.0.15:6379
   replicates 0c6b4100491f58e7a6307140fe75a311d18a8ca2
S: 16817240277c5e1a5ad7d92421d3c9626ed80c89 172.38.0.16:6379
   replicates 9e00fce0f3d46a84e90a345e0a49bd3b6b83f0de
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join
...........................................................................

2.解决方案

检查redis的配置文件，这里我的配置文件是使用shell脚本写的，如下：

for port in $(seq 1 6);\
do \
mkdir -p /mydata/redis/node-${port}/conf
touch /mydata/redis/node-${port}/conf/redis.conf
cat << EOF >/mydata/redis/node-${port}/conf/redis.conf
port 6379
bind 0.0.0.0
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
cluster-announce-ip 172.38.0.1${port}
cluster-announce-port 6379
appendonly yes
EOF
done

发现配置文件中虽然开放了客户端访问端口6379，但是没有开放总线端口，总线端口的port是在原客户端访问端口的基础上加10000，用于redis集群间的通信，因此我们需要在shell脚本中添加一行

cluster-announce-bus-port 16379

重新运行shell脚本，更新reids的配置，再运行启动redis的脚本即可，代码如下：

for port in $(seq 1 6);\
do \
docker run -p 637${port}:6379 -p 1637${port}:16379 --name redis-${port} \
-v /mydata/redis/node-${port}/data:/data \
-v /mydata/redis/node-${port}/conf/redis.conf:/etc/redis/redis.conf \
-d --net redis --ip 172.38.0.1${port} redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf
done