IT人日記 – 新冠病毐疫情下的自救法

新冠病毐疫情來勢洶洶，影響全世界，暫時仍未有特效藥，要抗疫，唯有提升自己的免疫力。免疫系統是身體防衛軍，我們的日常飲食、作息也與免疫力息息相關。要抵抗病菌入侵身體，除了外在做足防備，戴好口罩、勤洗手，內在「增強免疫力」看來是最好的抗病良方。

推介大家考慮吓以下幾種 提升免疫力的補充品-->  More

IT人日記 – 鼠年春節的嚴峻疫情

因應鼠年春節期間的嚴峻疫情，國務院辦公廳1月27日公佈的延長2020年春節假期的通知，呼籲公司決定將春節假期延長至2020年2月2日（農曆正月初九，星期日），2月3日（農曆正月初十，星期一）正常上班。延長的假期（2月1日，2月2日）將採用調休方式處理。香港很多公司亦容許員工在家工作，減少感染機會。 --> More

AWS VPC & backup example diagrams

for connecting to AWS VPC as below options:

VPN connection

You can establish a VPN connection to an Amazon Web Services (AWS)-managed virtual private gateway, which is the VPN device on the AWS side of the VPN connection.

You can use an AWS managed VPN connection or a third-party VPN solution. Use a third-party solution if you require full access and management of the AWS side of the VPN connection.

After creating your VPN connection, you can download the Internet Protocol Security (IPsec) VPN configuration from the Amazon VPC console to configure the firewall or device in your local network that connects to the VPN.

DX connection

An AWS Direct Connect (DX connection) links your internal network to a DX location over a standard 1-Gbps or 10-Gbps Ethernet fiber-optic cable.

DX usage is charged per port-hour with additional data transfer rates that vary by AWS Region. For more information, see AWS Direct Connect pricing.

VPC peering connection

A VPC peering connection connects two VPCs and routes traffic between them through private IP addresses, which allows the VPCs to function as if they are on the same network. These connections aren't subject to common issues, such as a single point of failure or network bandwidth bottlenecks, because they don't rely on physical hardware.

VPC peering is supported for VPCs across all AWS Regions in both the same or different AWS accounts. For more information, see VPC Peering Limitations.

VPC endpoints

A VPC endpoint is a private connection between your VPC and another AWS service that doesn't require internet access. The two types of VPC endpoints are interface VPC endpoints (for AWS PrivateLink services) and gateway VPC endpoints. After you configure a VPC endpoint, instances in your VPC can use private IP addresses to communicate with:

• Resources in other AWS services
• VPC endpoint services hosted by other AWS accounts
• Supported AWS Marketplace partner services

ClassicLink (only for EC2-Classic instances)

ClassicLink enables you to link an EC2-Classic instance to a VPC in your account within the same AWS Region without requiring public IP addresses or Elastic IP addresses for communication between instances.

Note: This option is available to users with accounts that support the EC2-Classic platform. You can use ClassicLink with any EC2-Classic instance.

Internet gateway

An internet gateway enables communication between instances in your VPC and the internet. You can scope the route to all destinations not explicitly known to the route table or to a narrower range of IP addresses.

NAT gateway

A NAT gateway is a managed service that enables instances in a private subnet of a VPC to connect to the internet or other AWS services without allowing connections to those instances from the internet.

Note: Be sure to create the NAT gateway in a public subnet. For more information, see NAT Gateway Rules and Limitations.

NAT instance

A NAT instance in the public subnet of a VPC enables instances in the private subnet to initiate outbound IPv4 traffic to the internet or other AWS services while also preventing those instances from receiving inbound traffic initiated by someone on the internet.

Note: A NAT gateway is recommended for common use cases. For more information, see Comparison of NAT Instances and NAT Gateways.

Android App Sample Program

Recently, I picked-up and studied Java and Android Studio programming again. I developed two Android App using Android Studio as below, and put in Google Play Store. If you have time to support me, please download to install and test it. (Read More)

香港人日記-專業旅運旅行社極不專業

我最近去泰國旅遊，散心順便轉一轉運氣揾1T工作，我預先在網上查過機票連酒店價錢，四日三夜大概每位HK$2200 (Pict 1)，之後貪方便去了家附近在大埔的專業旅運旅行社，我以為他們應該是專業和公道的公司，但是.... (Read More)

香港人日記-反送中運動局勢發展

今天香港各區的示威活動中，香港警察的暴力令我憤怒，警察情緒失控，除了如以往針對救護、記者和所有在街上的示威者外，更開始針對消防員， 攻擊消防車、射擊救護員、 濫打老人及婦孺… 可恥可恨… 期望早日解散及清算警隊。Read More

AWS 上的藍綠部署

使用本快速入門為 AWS 上的藍綠部署和設定以下環境：

• 管道：用於上傳 Amazon S3 儲存貯體時觸發，以將新的應用程式套件版本部署到 AWS Elastic Beanstalk 環境。
• AWS Lambda 函數：用於將藍色環境複製為綠色環境、對調網址，以及在完成藍色環境部署時終止綠色環境。
• AWS CodeBuild 專案：用於執行藍色與綠色環境之間初始網址對調，以及測試藍色環境部署。
• 如果未提供現有 Elastic Beanstalk 環境和存在快速入門的應用程式，本快速入門將會建立範例環境。
• Lambda 函數、CodeBuild 專案、CodePipeline 的AWS IAM 角色，以及 Elastic Beanstalk 範例應用程式的服務角色。
• 將存放 CodePipeline Artifact Store、Lambda Function 資產和 CodeBuild 資產的 Amazon S3 儲存貯體分開。您可以使用選用的 S3 儲存貯體，來存放 zip 套件，這個套件包含用於部署 Elastic Beanstalk 的應用程式程式碼。

資訊功能組別的認可的組織

三個可成為資訊功能組別的認可的組織:
1. iProA
2. IEEE
3. HK Computer Society

Building a eCommerce Web Site

Recently, I developed a eCommerce web site for selling Health supplement and providing healthy improvement service. It has the following features:

1. Shopping Web Site with Product categories, product maintenance, shopping cart, checkout payment, email notification, member login;
2. Submit application form to apply healthy card;
3. Submit application form to inquiry service;
4. Maintain posts for news update;
5. Multi-language feature;
6. VISA payment gateway.    (Read More)

Sample web site for booking and shopping function

I just created a sample web site for booking and shopping function as below link. You are welcome to provide your comment. Thanks.

http://ehealthy.infotechmanagefactory.com/