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 startedREADONLY You can't write against a read only replica. Clearing 10.1.33.110:8026 ...Background append only file rewriting startedREADONLY You can't write against a read only replica. Clearing 10.1.33.111:8027 ...Background append only file rewriting startedREADONLY You can't write against a read only replica. Clearing 10.1.33.107:8007 ...Background append only file rewriting startedOKClearing 10.1.33.108:8024 ...Background append only file rewriting startedREADONLY You can't write against a read only replica. Clearing 10.1.33.104:8020 ...Background append only file rewriting startedREADONLY You can't write against a read only replica. Clearing 10.1.33.114:8014 ...Background append only file rewriting startedOKClearing 10.1.33.109:8025 ...Background append only file rewriting startedREADONLY You can't write against a read only replica. Clearing 10.1.33.105:8005 ...Background append only file rewriting startedOKClearing 10.1.33.108:8008 ...Background append only file rewriting startedOK

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 1fi# 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 1fi# 确保redis-cli可用echo "Checking \`redis-cli\` ..."which "$REDIS_CLI" > /dev/null 2>&1if test $? -ne 0; then echo "Command \`redis-cli\` is not exists or not executable." echo "You can set environment variable \`REDIS_CLI\` to point to the redis-cli." echo "Example: export REDIS_CLI=/usr/local/bin/redis-cli" exit 1fiif test -z "$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,$3); }'`fiif test -z "$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 fielse # 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 donefi

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：
https://github.com/eyjian/redis-tools/blob/master/clear_redis_cluster.sh

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