详解如何清理redis集群的所有数据

1. 背景：生产测试后redis中产生大量数据

生产前需要清理reids集群中的数据。、
你看有很多key呢：

使用工具

使用命令，查看是否有数据：

keys * 

2. 清理步骤

2.1 任意登录一台redis机器

执行下面脚本：

clear_redis_cluster.sh 10.1.33.101:8001 redis

执行日志如下：

clearing 10.1.33.112:8028 ...
background append only file rewriting started
readonly you can't write against a read only replica. 
clearing 10.1.33.110:8026 ...
background append only file rewriting started
readonly you can't write against a read only replica. 
clearing 10.1.33.111:8027 ...
background append only file rewriting started
readonly you can't write against a read only replica. 
clearing 10.1.33.107:8007 ...
background append only file rewriting started
ok
clearing 10.1.33.108:8024 ...
background append only file rewriting started
readonly you can't write against a read only replica. 
clearing 10.1.33.104:8020 ...
background append only file rewriting started
readonly you can't write against a read only replica. 
clearing 10.1.33.114:8014 ...
background append only file rewriting started
ok
clearing 10.1.33.109:8025 ...
background append only file rewriting started
readonly you can't write against a read only replica. 
clearing 10.1.33.105:8005 ...
background append only file rewriting started
ok
clearing 10.1.33.108:8008 ...
background append only file rewriting started
ok

2.2 clear_redis_cluster.sh内容

#!/bin/bash
# writed by yijian on 2018/8/20
# batch to clear all nodes using flushall command
# 用来清空一个redis集群中的所有数据，要求 flushall 命令可用，
# 如果在 redis.conf 中使用 rename 改名了 flushall，则不能执行本脚本。
# 可带两个参数：
# 1）参数1 集群中的任一可用节点（必须）
# 2）连接redis的密码（设置了密码才需要）
redis_cli=${redis_cli:-redis-cli}
redis_ip=${redis_ip:-127.0.0.1}
redis_port=${redis_port:-6379}

# 显示用法函数
function usage()
{
  echo "usage: clear_redis_cluster.sh a_redis_node_of_cluster redis_password"
  echo "example1: clear_redis_cluster.sh '127.0.0.1:6379'"
  echo "example2: clear_redis_cluster.sh '127.0.0.1:6379' '123456'"
}

# 检查参数个数
if test $# -lt 1 -o $# -gt 2; then
  usage
  exit 1
fi

# 第一个参数为集群中的节点，
redis_node="$1"
# 第二个参数为密码
redis_password=""
if test $# -ge 2; then
  redis_password="$2"
fi

# 取得ip和端口
eval $(echo "$redis_node" | awk -f[\:] '{ printf("redis_ip=%s\nredis_port=%s\n",$1,$2) }')
if test -z "$redis_ip" -o -z "$redis_port"; then
  echo "parameter error: \`$redis_node\`."
  usage
  exit 1
fi

# 确保redis-cli可用
echo "checking \`redis-cli\` ..."
which "$redis_cli" > /dev/null 2>&1
if test $? -ne 0; then
  echo "command \`redis-cli\` is not exists or not executable."
  echo "you can set environment variable \`redis_cli\` to point to the redis-cli."
  echo "example: export redis_cli=/usr/local/bin/redis-cli"
  exit 1
fi

if test -z "$redis_password"; then
  redis_nodes=`redis-cli -h $redis_ip -p $redis_port cluster nodes | awk -f[\ \:\@] '!/err/{ printf("%s:%s\n",$2,$3); }'`
else
  redis_nodes=`redis-cli --no-auth-warning -a "$redis_password" -h $redis_ip -p $redis_port cluster nodes | awk -f[\ \:\@] '!/err/{ printf("%s:%s\n",$2,$3); }'`
fi
if test -z "$redis_nodes"; then
  # standlone（非集群）
  if test -z "$redis_password"; then
    $redis_cli -h $redis_ip -p $redis_port flushall async
    $redis_cli -h $redis_ip -p $redis_port bgrewriteaof
  else
    $redis_cli --no-auth-warning -a "$redis_password" -h $redis_ip -p $redis_port flushall async
    $redis_cli --no-auth-warning -a "$redis_password" -h $redis_ip -p $redis_port bgrewriteaof
  fi
else
  # cluster（集群）
  for redis_node in $redis_nodes;
  do
    if test ! -z "$redis_node"; then
      eval $(echo "$redis_node" | awk -f[\:] '{ printf("redis_node_ip=%s\nredis_node_port=%s\n",$1,$2) }')

      if test ! -z "$redis_node_ip" -a ! -z "$redis_node_port"; then
        # clear
        echo -e "clearing \033[1;33m${redis_node_ip}:${redis_node_port}\033[m ..."
        if test -z "$redis_password"; then
          result=`$redis_cli -h $redis_node_ip -p $redis_node_port flushall async`
          $redis_cli -h $redis_node_ip -p $redis_node_port bgrewriteaof
        else
          result=`$redis_cli --no-auth-warning -a "$redis_password" -h $redis_node_ip -p $redis_node_port flushall async`
          $redis_cli --no-auth-warning -a "$redis_password" -h $redis_node_ip -p $redis_node_port bgrewriteaof
        fi

        if test ! -z "$result"; then
          # success
          if test "$result" = "ok"; then
            echo -e "\033[0;32;32m$result\033[m"
          else
            echo -e "\033[0;32;31m$result\033[m"
          fi
        fi
      fi
    fi
  done
fi

这位仁兄的脚本写的特别好。直接执行即可。

2.3 确认删除成功

使用redis工具查看：

3.清理单机redis

flushall 

4.总结

使用脚本删除redis集群中的数据。
记得地址哦：

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