在 MySQL 的 bin 目录下执行：登录到数据 mysql -uroot -p密码 use mysql; select host,user,password from user; 可以看到 user 为 root，host 为 localhost 的话，说明 MySQL 只允许本机连接，那么外网，本地软件客户端就无法连接了。

问答 2019-07-31 来自：开发者社区

Linux系统的ECS实例中执行yum更新命令返回“is not signed”错误

在Linux服务器中执行 yum update命令返回 is not signed错误。

问答 2019-07-31 来自：开发者社区

Linux系统的ECS实例中启动网卡失败

在Linux服务器中，启动网卡提示如下信息。 Device eth0 does not seem to be present，delaying initialization 系统显示类似如下。

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