154 lines
3.9 KiB
Bash
154 lines
3.9 KiB
Bash
#!/bin/bash
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echo "=== Redis 集群扩容操作 ==="
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# 配置参数
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EXISTING_NODE="127.0.0.1:7001"
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NEW_MASTER="127.0.0.1:7007"
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NEW_SLAVE="127.0.0.1:7008"
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BASE_DIR="/tmp/redis_cluster"
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# 1. 准备新节点
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echo "1. 准备新节点配置..."
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# 创建新节点目录
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mkdir -p ${BASE_DIR}/node-${NEW_MASTER#*:}
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mkdir -p ${BASE_DIR}/node-${NEW_SLAVE#*:}
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# 生成新主节点配置
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cat > ${BASE_DIR}/node-${NEW_MASTER#*:}/redis.conf << EOF
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port ${NEW_MASTER#*:}
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bind 127.0.0.1
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dir ${BASE_DIR}/node-${NEW_MASTER#*:}
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logfile ${BASE_DIR}/node-${NEW_MASTER#*:}/redis-${NEW_MASTER#*:}.log
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pidfile ${BASE_DIR}/node-${NEW_MASTER#*:}/redis-${NEW_MASTER#*:}.pid
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daemonize yes
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cluster-enabled yes
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cluster-config-file ${BASE_DIR}/node-${NEW_MASTER#*:}/nodes-${NEW_MASTER#*:}.conf
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cluster-node-timeout 15000
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cluster-slave-validity-factor 10
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cluster-migration-barrier 1
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cluster-require-full-coverage yes
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save 900 1
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save 300 10
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save 60 10000
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appendonly yes
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appendfilename "appendonly-7007.aof"
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appendfsync everysec
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maxmemory 256mb
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maxmemory-policy allkeys-lru
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tcp-keepalive 300
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databases 1
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EOF
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# 生成新从节点配置
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cat > ${BASE_DIR}/node-${NEW_SLAVE#*:}/redis.conf << EOF
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port ${NEW_SLAVE#*:}
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bind 127.0.0.1
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dir ${BASE_DIR}/node-${NEW_SLAVE#*:}
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logfile ${BASE_DIR}/node-${NEW_SLAVE#*:}/redis-${NEW_SLAVE#*:}.log
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pidfile ${BASE_DIR}/node-${NEW_SLAVE#*:}/redis-${NEW_SLAVE#*:}.pid
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daemonize yes
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cluster-enabled yes
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cluster-config-file ${BASE_DIR}/node-${NEW_SLAVE#*:}/nodes-${NEW_SLAVE#*:}.conf
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cluster-node-timeout 15000
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cluster-slave-validity-factor 10
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cluster-migration-barrier 1
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cluster-require-full-coverage yes
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save ""
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appendonly no
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maxmemory 256mb
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maxmemory-policy allkeys-lru
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tcp-keepalive 300
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databases 1
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EOF
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# 2. 启动新节点
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echo "2. 启动新节点..."
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redis-server ${BASE_DIR}/node-${NEW_MASTER#*:}/redis.conf
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redis-server ${BASE_DIR}/node-${NEW_SLAVE#*:}/redis.conf
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sleep 3
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# 验证新节点启动
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for port in ${NEW_MASTER#*:} ${NEW_SLAVE#*:}; do
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if redis-cli -p $port ping > /dev/null 2>&1; then
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echo "✅ 新节点 $port 启动成功"
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else
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echo "❌ 新节点 $port 启动失败"
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exit 1
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fi
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done
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# 3. 添加新主节点到集群
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echo "3. 添加新主节点到集群..."
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echo "使用 redis-cli 添加新主节点:"
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redis-cli --cluster add-node ${NEW_MASTER} ${EXISTING_NODE}
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# 等待节点加入
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sleep 5
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# 验证节点加入
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echo "验证新主节点加入:"
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redis-cli -h ${EXISTING_NODE%:*} -p ${EXISTING_NODE#*:} CLUSTER NODES | grep ${NEW_MASTER%:*}:${NEW_MASTER#*:}
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# 4. 重新分配槽位
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echo "4. 重新分配槽位..."
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# 获取新主节点ID
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NEW_MASTER_ID=$(redis-cli -h ${NEW_MASTER%:*} -p ${NEW_MASTER#*:} CLUSTER MYID)
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echo "新主节点ID: $NEW_MASTER_ID"
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# 计算要迁移的槽位数量（假设平均分配）
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CURRENT_MASTERS=3
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NEW_MASTERS=4
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SLOTS_PER_MASTER=$((16384 / NEW_MASTERS))
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SLOTS_TO_MIGRATE=$((16384 / NEW_MASTERS))
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echo "每个主节点应分配槽位数: $SLOTS_PER_MASTER"
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echo "需要迁移的槽位数: $SLOTS_TO_MIGRATE"
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# 使用 redis-cli 重新分片
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echo "执行重新分片..."
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redis-cli --cluster reshard ${EXISTING_NODE} \
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--cluster-from all \
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--cluster-to $NEW_MASTER_ID \
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--cluster-slots $SLOTS_TO_MIGRATE \
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--cluster-yes
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sleep 5
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# 5. 添加新从节点
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echo "5. 添加新从节点..."
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redis-cli --cluster add-node ${NEW_SLAVE} ${EXISTING_NODE} --cluster-slave --cluster-master-id ${NEW_MASTER_ID}
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# 等待从节点加入
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sleep 5
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# 6. 验证扩容结果
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echo "集群节点信息:"
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redis-cli -h ${EXISTING_NODE%:*} -p ${EXISTING_NODE#*:} CLUSTER NODES
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echo
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echo "集群状态信息:"
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redis-cli -h ${EXISTING_NODE%:*} -p ${EXISTING_NODE#*:} CLUSTER INFO
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echo
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echo "槽位分配验证:"
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redis-cli -h ${EXISTING_NODE%:*} -p ${EXISTING_NODE#*:} CLUSTER SLOTS | grep -A 2 -B 2 ${NEW_MASTER%:*}
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# 7. 测试新节点 - 写入数据至新主节点并验证
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echo
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echo "=== 集群扩容完成 ==="
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echo "新主节点: $NEW_MASTER (ID: $NEW_MASTER_ID)"
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echo "新从节点: $NEW_SLAVE"
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echo "集群现有节点数: 8 (4主4从)"
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