181 lines
6.0 KiB
Bash
181 lines
6.0 KiB
Bash
#!/bin/bash
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# MySQL主从复制配置脚本
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# 用途：配置MySQL主从复制
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set -e
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MASTER_IP="172.16.0.67"
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SLAVE_IP="172.16.0.68"
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DB_NAME="hzdyjs_xg"
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REPL_USER="repl"
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REPL_PASSWORD="Repl@123456"
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ROOT_PASSWORD="Hzdyjs@Root@123456"
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echo "=========================================="
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echo "MySQL主从复制配置脚本"
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echo "=========================================="
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# 检查当前机器IP
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CURRENT_IP=$(hostname -I | awk '{print $1}')
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echo "当前机器IP: $CURRENT_IP"
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if [ "$CURRENT_IP" = "$MASTER_IP" ]; then
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echo "配置主库 (Master)..."
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# 检查是否已经配置过
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if grep -q "server-id = 1" /etc/my.cnf 2>/dev/null; then
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echo "⚠️ 检测到主库配置已存在，跳过配置文件修改"
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echo "如果binlog未开启，请手动检查配置"
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else
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# 1. 配置主库my.cnf
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echo "正在配置主库 my.cnf..."
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cat >> /etc/my.cnf <<EOF
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# 主从复制配置
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server-id = 1
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log-bin = mysql-bin
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binlog-format = ROW
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binlog-do-db = $DB_NAME
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expire_logs_days = 7
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max_binlog_size = 500M
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# 性能优化配置（减少主从复制对主库性能影响）
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# 使用性能优先方案，性能影响约1-2%
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sync_binlog = 0
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binlog_cache_size = 2M
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max_binlog_cache_size = 512M
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EOF
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# 2. 重启MySQL
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echo "正在重启MySQL服务..."
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systemctl restart mysqld
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sleep 5
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echo "MySQL服务已重启"
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fi
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# 3. 检查并创建复制用户
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echo "检查复制用户..."
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USER_EXISTS=$(mysql -u root -p"$ROOT_PASSWORD" -e "SELECT COUNT(*) FROM mysql.user WHERE user='$REPL_USER' AND host='$SLAVE_IP';" -s -N 2>/dev/null || echo "0")
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if [ "$USER_EXISTS" = "0" ]; then
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echo "创建复制用户 $REPL_USER@$SLAVE_IP..."
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mysql -u root -p"$ROOT_PASSWORD" <<EOF
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CREATE USER IF NOT EXISTS '$REPL_USER'@'$SLAVE_IP' IDENTIFIED BY '$REPL_PASSWORD';
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GRANT REPLICATION SLAVE ON *.* TO '$REPL_USER'@'$SLAVE_IP';
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FLUSH PRIVILEGES;
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EOF
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echo "复制用户创建成功"
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else
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echo "复制用户已存在，跳过创建"
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fi
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# 4. 显示主库状态
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echo ""
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echo "=========================================="
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echo "主库状态信息（请记录以下信息用于从库配置）："
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echo "=========================================="
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mysql -u root -p"$ROOT_PASSWORD" -e "SHOW MASTER STATUS;" 2>/dev/null || {
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echo "⚠️ 无法获取主库状态，请检查："
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echo " 1. MySQL服务是否正常运行"
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echo " 2. binlog是否已开启"
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echo " 3. root密码是否正确"
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exit 1
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}
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echo ""
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echo "主库配置完成！"
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echo "⚠️ 重要：请记录上面的 File 和 Position 值，用于从库配置"
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elif [ "$CURRENT_IP" = "$SLAVE_IP" ]; then
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echo "配置从库 (Slave)..."
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# 检查是否已经配置过
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if grep -q "server-id = 2" /etc/my.cnf 2>/dev/null; then
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echo "⚠️ 检测到从库配置已存在，跳过配置文件修改"
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echo "如果配置不正确，请手动检查 /etc/my.cnf"
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else
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# 1. 配置从库my.cnf
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echo "正在配置从库 my.cnf..."
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cat >> /etc/my.cnf <<EOF
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# 主从复制配置
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server-id = 2
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relay-log = mysql-relay-bin
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read-only = 1
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replicate-do-db = $DB_NAME
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EOF
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# 2. 重启MySQL
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echo "正在重启MySQL服务..."
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systemctl restart mysqld
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sleep 5
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echo "MySQL服务已重启"
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fi
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# 3. 检查当前从库状态
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echo "检查当前从库状态..."
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SLAVE_STATUS=$(mysql -u root -p"$ROOT_PASSWORD" -e "SHOW SLAVE STATUS\G" 2>/dev/null | grep -c "Master_Host" || echo "0")
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if [ "$SLAVE_STATUS" != "0" ]; then
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echo "⚠️ 检测到从库已配置主从复制"
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echo "当前主从状态："
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mysql -u root -p"$ROOT_PASSWORD" -e "SHOW SLAVE STATUS\G" 2>/dev/null | grep -E "Slave_IO_Running|Slave_SQL_Running|Master_Host|Master_Log_File|Read_Master_Log_Pos|Seconds_Behind_Master" || true
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echo ""
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read -p "是否要重新配置主从复制？(y/N): " RECONFIGURE
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if [ "$RECONFIGURE" != "y" ] && [ "$RECONFIGURE" != "Y" ]; then
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echo "跳过重新配置"
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exit 0
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fi
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echo "停止当前从库复制..."
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mysql -u root -p"$ROOT_PASSWORD" -e "STOP SLAVE;" 2>/dev/null || true
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fi
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# 4. 提示用户输入主库状态信息
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echo ""
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echo "=========================================="
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echo "请输入主库的binlog信息（从主库 SHOW MASTER STATUS 获取）："
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echo "=========================================="
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read -p "MASTER_LOG_FILE (例如: mysql-bin.000001): " MASTER_LOG_FILE
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read -p "MASTER_LOG_POS (例如: 154): " MASTER_LOG_POS
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# 验证输入
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if [ -z "$MASTER_LOG_FILE" ] || [ -z "$MASTER_LOG_POS" ]; then
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echo "❌ 错误：MASTER_LOG_FILE 和 MASTER_LOG_POS 不能为空"
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exit 1
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fi
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# 5. 配置从库复制
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echo ""
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echo "正在配置从库复制..."
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mysql -u root -p"$ROOT_PASSWORD" <<EOF
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STOP SLAVE;
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CHANGE MASTER TO
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MASTER_HOST='$MASTER_IP',
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MASTER_USER='$REPL_USER',
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MASTER_PASSWORD='$REPL_PASSWORD',
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MASTER_LOG_FILE='$MASTER_LOG_FILE',
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MASTER_LOG_POS=$MASTER_LOG_POS;
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START SLAVE;
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EOF
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if [ $? -eq 0 ]; then
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echo ""
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echo "=========================================="
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echo "从库配置完成！主从复制状态："
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echo "=========================================="
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mysql -u root -p"$ROOT_PASSWORD" -e "SHOW SLAVE STATUS\G" 2>/dev/null | grep -E "Slave_IO_Running|Slave_SQL_Running|Master_Host|Master_Log_File|Read_Master_Log_Pos|Seconds_Behind_Master|Last_IO_Error|Last_SQL_Error" || true
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echo ""
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echo "✅ 使用以下命令检查主从状态："
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echo " mysql -u root -p -e \"SHOW SLAVE STATUS\\G\" | grep -i \"slave_io_running\\|slave_sql_running\""
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else
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echo "❌ 从库配置失败，请检查错误信息"
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exit 1
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fi
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else
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echo "错误：当前机器IP ($CURRENT_IP) 不在配置范围内"
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exit 1
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fi
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echo "=========================================="
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