redis集群开不起来，用redis-cli连接的时候出现如下错误:
CLUSTERDOWN The cluster is down
然后使用redis-trib.rb检查：
./redis-trib.rb check 10.10.25.243:6379
出现如下错误：
Connecting to node 10.10.20.243:6379: OK
>>> Performing Cluster Check(using node 10.10.20.243:6379)
[OK] All nodes agree about slotsconfiguration.
>>> Check for open slots...
>>> Check slots coverage...
[ERR] Not all 16384 slots are covered by nodes.
因为我只有一个节点，单节点集群，所以使用如下方法来修复节点:
./redis-trib.rb fix 10.10.20.243:6379
之后输出如下:
....... >>> Covering slot 16276 with 10.10.25.243:6379 >>> Covering slot 16277 with 10.10.25.243:6379 >>> Covering slot 16278 with 10.10.25.243:6379 >>> Covering slot 16279 with 10.10.25.243:6379 >>> Covering slot 16280 with 10.10.25.243:6379 >>> Covering slot 16281 with 10.10.25.243:6379 >>> Covering slot 16282 with 10.10.25.243:6379 >>> Covering slot 16283 with 10.10.25.243:6379 >>> Covering slot 16284 with 10.10.25.243:6379 >>> Covering slot 16285 with 10.10.25.243:6379 >>> Covering slot 16286 with 10.10.25.243:6379 >>> Covering slot 16287 with 10.10.25.243:6379 >>> Covering slot 16288 with 10.10.25.243:6379 >>> Covering slot 16289 with 10.10.25.243:6379 >>> Covering slot 16290 with 10.10.25.243:6379 >>> Covering slot 16291 with 10.10.25.243:6379 >>> Covering slot 16292 with 10.10.25.243:6379 >>> Covering slot 16293 with 10.10.25.243:6379 >>> Covering slot 16294 with 10.10.25.243:6379 >>> Covering slot 16295 with 10.10.25.243:6379 >>> Covering slot 16296 with 10.10.25.243:6379 >>> Covering slot 16297 with 10.10.25.243:6379 >>> Covering slot 16298 with 10.10.25.243:6379 >>> Covering slot 16299 with 10.10.25.243:6379 >>> Covering slot 16300 with 10.10.25.243:6379 >>> Covering slot 16301 with 10.10.25.243:6379 >>> Covering slot 16302 with 10.10.25.243:6379 >>> Covering slot 16303 with 10.10.25.243:6379 >>> Covering slot 16304 with 10.10.25.243:6379 >>> Covering slot 16305 with 10.10.25.243:6379 >>> Covering slot 16306 with 10.10.25.243:6379 ........
然后再检查下集群的情况：
redis-trib.rb check 10.10.25.243:6379
输出如下:
>>> Performing Cluster Check (using node 10.10.25.243:6379) M: 4df1b649c1d0d08c2fa2a55e13d8d95c6d4f2b22 10.10.25.243:6379 slots:0-16383 (16384 slots) master 0 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
检查下集群信息:
root@nick-VirtualBox:/home/nick/software/redis-3.2.8# redis-cli -h 10.10.25.243 -p 6379 10.10.25.243:6379> cluster info cluster_state:ok cluster_slots_assigned:16384 cluster_slots_ok:16384 cluster_slots_pfail:0 cluster_slots_fail:0 cluster_known_nodes:1 cluster_size:1 cluster_current_epoch:0 cluster_my_epoch:0 cluster_stats_messages_sent:0 cluster_stats_messages_received:0
最后用redis-cli连下，正常了。可以连接，并且放入值和取出值也正常。