redis集群持久化数据重启恢复 博客分类： redis redis

网上已有很多关于redis的集群部署方案的文章，这里就直接忽略了。
目前考虑redis集群宕机后，如果有数据是持久化了的，那么重启的时候如何恢复呢？
网上给的答案都是使用dump.rdb或者aof方案来实现
    

修改redis_*.conf配置文件，屏蔽aof方案的持久化方式

       

           # AOF and RDB persistence can be enabled at the same time without problems.
           # If the AOF is enabled on startup Redis will load the AOF, that is the file
           # with the better durability guarantees.
           appendonly no
        

    

修改redis_*.conf配置文件，设置dump方式备份文件名称，每个节点文件不能相同，否则会覆盖

        

            # The filename where to dump the DB
            dbfilename "dump_20000.rdb"
         

   使用以上文件重启redis cluster时会明确提示启动失败：
      

[ERR] Node 127.0.0.1:20000 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0. 

   根据以上内容再次排查发现，给的方案普遍是删除相关文件，但是这样就无法实现题目中的目的。
   [最终] 通过对redis-cli --cluster 的不同命令进行尝试，发现需要对每个节点进行check就可以恢复集群模式，不需要用create来重新构建集群。因为create和add-node都需要保证节点数据为空【以下方式正常情况是无需操作的，直接启动对应端口的服务即可，因为node_2000.conf已生成】
    

       redis-cli --cluster check 127.0.0.1:20000 
       redis-cli --cluster check 127.0.0.1:20001
       redis-cli --cluster check 127.0.0.1:20002
       redis-cli --cluster check 127.0.0.1:20003
       redis-cli --cluster check 127.0.0.1:20004
       redis-cli --cluster check 127.0.0.1:20005
     

   以下是centos下的redis无数据启动和持久化重启脚本

    

redis_clear_restart.sh

    

for p in `ps -ef|grep /usr/local/bin/redis-server | awk '{print $2"_"$3}'`
do
  a=`echo $p |awk -F _ '{print $1}'`
  b=`echo $p |awk -F _ '{print $2}'`
  if [ $b == "1" ]; then
     echo "kill -9 $a `kill -9 $a` "
  fi
done
echo "rm -rf appendonly_*.aof dump_*.rdb nodes-2000*.conf"
rm -rf appendonly_*.aof dump_*.rdb  nodes-2000*.conf

/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20000.conf
/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20001.conf
/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20002.conf
/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20003.conf
/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20004.conf
/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20005.conf
/usr/local/bin/redis-cli -a 123456 --cluster create --cluster-replicas 1 127.0.0.1:20000 127.0.0.1:20001 127.0.0.1:20002 127.0.0.1:20003 127.0.0.1:20004 127.0.0.1:20005 <<EO
F
yes
EOF
     

    

    

redis_dump_restart.sh

    

for p in `ps -ef|grep /usr/local/bin/redis-server | awk '{print $2"_"$3}'`
do
  a=`echo $p |awk -F _ '{print $1}'`
  b=`echo $p |awk -F _ '{print $2}'`
  if [ $b == "1" ]; then
     echo "kill -9 $a `kill -9 $a` "
  fi
done
echo "rm -rf appendonly_*.aof dump_*.rdb nodes-2000*.conf"
rm -rf appendonly_*.aof dump_*.rdb  nodes-2000*.conf

/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20000.conf
/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20001.conf
/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20002.conf
/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20003.conf
/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20004.conf
/usr/local/bin/redis-server /home/sysusr/redis/redis-cluster/redis-20005.conf

/usr/local/bin/redis-cli -a 123456 --cluster check 127.0.0.1:20000
/usr/local/bin/redis-cli -a 123456 --cluster check 127.0.0.1:20001
/usr/local/bin/redis-cli -a 123456 --cluster check 127.0.0.1:20002
/usr/local/bin/redis-cli -a 123456 --cluster check 127.0.0.1:20003
/usr/local/bin/redis-cli -a 123456 --cluster check 127.0.0.1:20004
/usr/local/bin/redis-cli -a 123456 --cluster check 127.0.0.1:20005
     

    
 
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