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Martin Hope
Kid_Learning_C
Asked: 2021-12-17 06:30:57 +0800 CST
  • 0

我正在 AWS 中构建我的应用程序。

我已经在 EC2 实例中部署了我的 Reactjs 前端项目。我不想让外部互联网世界的用户直接访问我的 EC2 实例，而是将它放在 AWS API 网关后面。因此，AWS API Gateway 将成为我的应用程序前端和后端服务的单一入口点。这是计划：

外部世界 ---> AWS API Gateway ---> 网络负载均衡器 ---> 我的 VPC 目标组/EC2 实例

这是我所做的：

  1. Reactjs Frontend 项目在 EC2 实例中运行良好；我可以使用 EC2 实例的公共 IP 地址访问网页。

  2. 配置良好的目标组和网络负载均衡器。我通过在浏览器中输入 NLB 的 DNS 名称来确认，即http://myapp-frontend-NLB-c11112esd43524rw.elb.ap-northeast-1.amazonaws.com，它成功加载/打开了我的应用程序的前端网页。

  3. 我创建了新的 AWS API Gateway (REST API) 并为其配置了自定义域名。（在 AWS Certificate Manager 中处理了 https 证书）。

    即自定义域是frontend.myapp.com；API网关域名是d-123sdf1234asd.execute-api.ap-northeast-1.amazonaws.com

    我已经NS在我的 DNS 提供商中为他们创建了新记录，因此frontend.myapp.com指向d-123sdf1234asd.execute-api.ap-northeast-1.amazonaws.com

  4. 我已经按照这个aws文档：https ://docs.aws.amazon.com/apigateway/latest/developerguide/getting-started-with-private-integration.html一步一步配置了VPC链接、API资源、集成类型， ETC。

部署创建的 API 后，当我点击打开 Invoke URL 时，（以 的形式https://123qwe123qe.execute-api.ap-northeast-1.amazonaws.com/[stage]），我可以看到返回的 HTML 代码。

我预计当我frontend.myapp.com在浏览器中访问时，DNS 最终会将流量引导到 API Gateway 的域名d-123sdf1234asd.execute-api.ap-northeast-1.amazonaws.com，然后 API Gateway 会将请求传递给 NLB 等，最终加载网页 / 或返回相同的 HTML 代码。

但是，当我frontend.myapp.com在浏览器中访问时，没有任何响应。我认为 DNS 记录不起作用。dig +trace docloud.iwg-inc.co.jp.给出以下结果：


; <<>> DiG 9.10.6 <<>> +trace frontend.myapp.com.
;; global options: +cmd
.     3240  IN  NS  i.root-servers.net.
.     3240  IN  NS  d.root-servers.net.
.     3240  IN  NS  b.root-servers.net.
.     3240  IN  NS  m.root-servers.net.
.     3240  IN  NS  j.root-servers.net.
.     3240  IN  NS  h.root-servers.net.
.     3240  IN  NS  f.root-servers.net.
.     3240  IN  NS  g.root-servers.net.
.     3240  IN  NS  k.root-servers.net.
.     3240  IN  NS  c.root-servers.net.
.     3240  IN  NS  a.root-servers.net.
.     3240  IN  NS  l.root-servers.net.
.     3240  IN  NS  e.root-servers.net.
;; Received 811 bytes from 240d:1a:6a5:c900:e67e:66ff:fe1f:bf4c#53(240d:1a:6a5:c900:e67e:66ff:fe1f:bf4c) in 29 ms

 
 ...other results...

frontend.myapp.com.  14400 IN  NS  d-123sdf1234asd.execute-api.ap-northeast-1.amazonaws.com.
;; Received 117 bytes from 54.68.111.244#53(ns4.jp-domains.jp) in 131 ms

;; connection timed out; no servers could be reached

如您所见， frontend.myapp.com.确实指向d-123sdf1234asd.execute-api.ap-northeast-1.amazonaws.com.作为NS记录。

但是，它说connection timed out; no servers could be reached。

d-123sdf1234asd.execute-api.ap-northeast-1.amazonaws.com.是我的 API Gateway 的自定义域名，我用调用 URL 测试过，它连接到服务。

为什么会这样说no servers could be reached？

这是什么意思？我该如何解决它并完成流程？

domain-name-system dns-hosting amazon-api-gateway
Martin Hope
Kid_Learning_C
Asked: 2020-08-13 01:20:10 +0800 CST
  • 0

我正在使用谷歌云，我有一个运行良好的虚拟机（Ubuntu 18.04）。apt-get 命令运行良好，mysql 服务运行良好。我们称它为 vm-1

我需要创建另一个重复的 vm，所以我首先制作了 vm-1 的快照，并使用此快照创建了一个新的 vm，称为 vm-2。

当我在 vm-2 上工作时，我发现简单的命令sudo apt-get install ***会失败并卡在与 mysql-server 相关的步骤中。下面是一个例子：

John@vm-2:~$ sudo apt-get install tree
Reading package lists... Done
Building dependency tree
Reading state information... Done
tree is already the newest version (1.7.0-5).
The following packages were automatically installed and are no longer required:
  libnvidia-common-390 linux-gcp-headers-5.0.0-1033
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 170 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up mysql-server-5.7 (5.7.30-0ubuntu0.18.04.1) ...
/var/lib/mysql/ibdata1: 14143
ERROR: Database files are locked. Daemon already running?
Warning: Unable to start the server. Please restart MySQL and run mysql_upgrade to ensure the database is ready for use.
/var/lib/mysql/ibdata1: 14143
ERROR: Database files are locked. Daemon already running?
Warning: Unable to start the server.
Job for mysql.service failed because the control process exited with error code.
See "systemctl status mysql.service" and "journalctl -xe" for details.
invoke-rc.d: initscript mysql, action "start" failed.
● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: exit-code) since Wed 2020-08-12 18:11:39 JST; 7ms ago
  Process: 24068 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/run/mysqld/mysqld.pid (code=exited, status=1/FAILURE)
  Process: 24046 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
 Main PID: 1711 (code=exited, status=0/SUCCESS)
dpkg: error processing package mysql-server-5.7 (--configure):
 installed mysql-server-5.7 package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.7; however:
  Package mysql-server-5.7 is not configured yet.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Errors were encountered while processing:
 mysql-server-5.7
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
John@vm-2:~$

它一直在说

ERROR: Database files are locked. Daemon already running?
Warning: Unable to start the server. Please restart MySQL and run mysql_upgrade to ensure the database is ready for use.
/var/lib/mysql/ibdata1: 14143
ERROR: Database files are locked. Daemon already running?
Warning: Unable to start the server.

首先 apt-get 与 mysql-server 有什么关系？我一直认为它们是两个独立的软件。

我该如何解决这个问题？除了恢复在原始虚拟机中完全正常工作的快照之外，我什么也没做。一切都一样，怎么apt-get会失败？

mysql virtual-machines apt snapshot gcloud