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总结：文章介绍 golang 单例模式，属创建型模式，提供创建对象最佳方式，通过 sync.Once 保证线程安全，示例代码展示获取单例及打印地址，多个 goroutine 打印结果相同。
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CentOS7 的 debuginfo-install 步骤：先允许 debuginfo 源（改 /etc/yum.repos.d/CentOS-Debuginfo.repo 中 enabled 为 1），再安装 glibc-debuginfo 和 yum-utils，最后安装调式信息包及依赖（如 libgcc 等）。- Published on
CentOS7 系统的 systemctl 服务介绍及示例。配置文件有[Unit]、[Service]、[Install]区块，分别用于定义元数据、服务配置和启动设置。给出两个服务配置示例及相关脚本，最后通过 systemctl daemon-reload 使其生效。- Published on
CentOS7 优盘安装时出现“[sda] No Caching mode page found”，需耐心等待超时输出错误信息，找到 U 盘位置（如 sda4），修改安装选项第二行，将 inst.stage2 改为 hd:/dev/sda4:/，按 Ctrl+X 安装，安装后启动网络。- Published on
CentOS6 is end-of-life with no more updates. Its online yum repos are archived. Options for running it include reinstalling with a newer version, converting to RHEL6, choosing a different distro. Doing nothing risks being hacked. Don't delay, migrate today.