08-27-周三_17-09-29

数据库/Redis_2025/cluster_scale_out.sh

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