效果：经过这 5 个网站的反链，我的网站流量翻倍了。 bluesky —— 一个社交平台，主要用户来自巴西、日本 https://aidisturbance.bsky.social/ Carrd —— 一个个人网站生成器，主要用户是艺术家 https://aidisturbance.carrd.co/ spotify —— 一个知名的博客平台 https://podcasters.spotify.com/pod/show/davidaidisturbance stripe 的碳排放捐赠页面 —— 一个支付平台，碳排放页面可以免费自定义 https://climate.stripe.com/ygvXDN twitch —— 一个直播平台 https://m.twitch.tv/guanweiyinyue/home 希望大家点赞收藏。

With Cloud Run gen1 and Go apps, we're getting sub-1s start times. With Node.js or Python, start times are dismal, ie. 5s or more. That's 5-10 times slower than starting these services locally. Although I haven't checked this rigorously, it seems that reading many files is very slow on Cloud Run, and the large number of imports these apps have don't play well with Cloud Run. With Gen.2, for a Go app, startup time went from 500ms to 3-4s, which is more than I expected, and support wasn't able to tell us whether that's normal. That's kind of a shame because otherwise it's one of the best services I used.

Question 1: “Why are customers so difficult to work with?” Because they want something custom. Question 2: “Why do they want custom work?” Because they are dealing with a different problem than our company imagined.Question 3: “Why didn’t we imagine the problem the customer is facing?” Because we started out in the healthcare industry and now most of our customers are in the banking industry.Question 4: “Why haven’t we built a product for the banking industry?” Because our product development team isn’t thinking about new product offerings.Question 5: “Why aren’t we thinking about new product offerings?” Because we are too busy building custom products.

git rebase HEAD~5 --exec "git commit --amend --no-edit --date 'now'"

We were trying to upload file contents to s3 when it came through as an InMemoryUploadedFile object in a Django request. We ended up doing the following because we didn't want to save the file locally. Hope it helps:

Activating the virtual environment # The easiest way to activate the virtual environment is to create a nested shell with poetry shell.

poetry add $(grep -v '^#' requirements.txt)

Django is great for SaaS

List your product everywhere Content is king as you will know. Early on with a limited budget - it's difficult to drive traffic to your landing page or website. Here are some free websites you can list your product on: producthunt.com alternativeto Killer Startups Beta List Reddit - be careful here, Reddit users hate advertising. Quora AppSumo Pitchwall Pinterest Betabound StartupBase Indie Hackers Designer News SaasSHub Launching Next

1) Research your competitors. See how many customers they service and what their estimated revenue is. There are plenty of tools for this. e.g.: Similar web. 2) Look through forums and places such as Quora to see what customers are saying about your competitor's products. This will give you an insight into their pain points and will give you an idea of what key areas to focus on to build a better product. 3) Do keyword research using tools such as wordstream. You can find search volumes and other metrics to help you understand how big your audience is and what keywords to target.

Django is great for SAAS

list of expert founders (in no particular order), I often follow: TK Kader. TK has started up many companies and is a coaching specialist for SAAS founders. I find his 3 step breakdown of concepts quite refreshing and easy to follow. Neil Patel. Neil is an expert marketer and usually covers some great tips on how to build content around your brand. Simon Hoiberg. Simon has a very cool and fun way of explaining advanced business concepts to developers. Rob Walling. Rob's YouTube channel does an excellent job of explaining all the core concepts you need to learn as a founder. He's also written several books on the subject and is involved in funding many new startups.

List your product everywhere Content is king as you will know. Early on with a limited budget - it's difficult to drive traffic to your landing page or website. Here are some free websites you can list your product on: producthunt.com alternativeto Killer Startups Beta List Reddit - be careful here, Reddit users hate advertising. Quora AppSumo Pitchwall Pinterest Betabound StartupBase Indie Hackers Designer News SaasSHub Launching Next

负责 TikTok Web 架构设计与性能优化

TurboScribe FreeFREE 100% Free4 Files DailyTranscribe up to 4 files for free every day.30 Minute UploadsEach file can be up to 30 minutes long.Upload 1 file at a time.Lower PriorityWait longer before your files are transcribed.

RESTful API is an interface that two computer systems use to exchange information securely over the internet. Most business applications have to communicate with other internal and third-party applications to perform various tasks. For example, to generate monthly payslips, your internal accounts system has to share data with your customer's banking system to automate invoicing and communicate with an internal timesheet application. RESTful APIs support this information exchange because they follow secure, reliable, and efficient software communication standards.

We’re excited to announce the second batch of a16z Open Source AI Grant recipients. This program is designed to support a thriving open source ecosystem around modern AI. We provide grant funding (not an investment) to developers and small teams who are building critical pieces of the open source AI stack. More information about the program and a list of prior recipients are available here.

Hoisting in Javascript

Arrays need to be declared. Lists don't, since they are built into Python. In the examples above, you saw that lists are created by simply enclosing a sequence of elements into square brackets. Creating an array, on the other hand, requires a specific function from either the array module (i.e., array.array()) or NumPy package (i.e., numpy.array()). Because of this, lists are used more often than arrays. Arrays can store data very compactly and are more efficient for storing large amounts of data. Arrays are great for numerical operations; lists cannot directly handle math operations. For example, you can divide each element of an array by the same number with just one line of code. If you try the same with a list, you'll get an error.

A tree with ‘n’ vertices has ‘n-1’ edges.

The edges of a tree are known as branches. Elements of trees are called their nodes. The nodes without child nodes are called leaf nodes.

A tree is a particular kind of graph.

As I reflect on this, we have spent way too much time building custom login

there are so many products out there that already have everything you need out of the box, for example:Login -> Firebase AuthAPI -> Firebase Functions

We had a 25% churn rate in the first week of charging. Once we found out why they were leaving,

List Comprehensions

查询集的过滤器

A portfolio is a collection of products, together with configuration information. Portfolios help manage product configuration, and who can use specific products and how they can use them. With AWS Service Catalog, you can create a customized portfolio for each type of user in your organization and selectively grant access to the appropriate portfolio.

Amazon Kinesis Data Streams (KDS) is a massively scalable and durable real-time data streaming service. KDS can continuously capture gigabytes of data per second from hundreds of thousands of sources such as website clickstreams, database event streams, financial transactions, social media feeds, IT logs, and location-tracking events.

Amazon Kinesis Data Firehose is the easiest way to reliably load streaming data into data lakes, data stores and analytics tools. It can capture, transform, and load streaming data into Amazon S3, Amazon Redshift, Amazon Elasticsearch Service, and Splunk,

DynamoDB Streams enables solutions such as these, and many others. DynamoDB Streams captures a time-ordered sequence of item-level modifications in any DynamoDB table and stores this information in a log for up to 24 hours.

AWS OpsWorks Stacks uses Chef cookbooks to handle tasks such as installing and configuring packages and deploying apps.

Your Amazon Athena query performance improves if you convert your data into open source columnar formats, such as Apache Parquet

Amazon Macie is a security service that uses machine learning to automatically discover, classify, and protect sensitive data in AWS.

AWS Service Catalog is becoming increasingly necessary as cloud infrastructure evolves, allowing IT and developers to share pre-approved services, which helps tear down silos and encourage DevOps-related practices.

Amazon AppStream 2.0 is a fully managed application streaming service. You centrally manage your desktop applications on AppStream 2.0 and securely deliver them to any computer.

A VPC endpoint enables you to privately connect your VPC to supported AWS services and VPC endpoint services powered by AWS PrivateLink without requiring an internet gateway, NAT device, VPN connection, or AWS Direct Connect connection. Instances in your VPC do not require public IP addresses to communicate with resources in the service. Traffic between your VPC and the other service does not leave the Amazon network.

Endpoint policies are currently supported by CodeBuild, CodeCommit, ELB API, SQS, SNS, CloudWatch Logs, API Gateway, SageMaker notebooks, SageMaker API, SageMaker Runtime, Cloudwatch Events and Kinesis Firehose.

Using VPC endpoint policies A VPC endpoint policy is an IAM resource policy that you attach to an endpoint when you create or modify the endpoint. If you do not attach a policy when you create an endpoint, we attach a default policy for you that allows full access to the service. If a service does not support endpoint policies, the endpoint allows full access to the service. An endpoint policy does not override or replace IAM user policies or service-specific policies (such as S3 bucket policies). It is a separate policy for controlling access from the endpoint to the specified service.

An interface VPC endpoint (interface endpoint) enables you to connect to services powered by AWS PrivateLink.

You can associate a health check with an alias record instead of or in addition to setting the value of Evaluate Target Health to Yes. However, it's generally more useful if Route 53 responds to queries based on the health of the underlying resources—the HTTP servers, database servers, and other resources that your alias records refer to. For example, suppose the following configuration:

For a non-proxy integration, you must set up at least one integration response, and make it the default response, to pass the result returned from the backend to the client. You can choose to pass through the result as-is or to transform the integration response data to the method response data if the two have different formats. For a proxy integration, API Gateway automatically passes the backend output to the client as an HTTP response. You do not set either an integration response or a method response.

Set up method response status code The status code of a method response defines a type of response. For example, responses of 200, 400, and 500 indicate successful, client-side error and server-side error responses, respectively.

AWS Glue is a fully managed extract, transform, and load (ETL) service that makes it easy for customers to prepare and load their data for analytics.

AWS Organizations terminology and concepts

You can use organizational units (OUs) to group accounts together to administer as a single unit. This greatly simplifies the management of your accounts.

What is AWS Elastic Beanstalk?

Because AWS Elastic Beanstalk performs an in-place update when you update your application versions, your application can become unavailable to users for a short period of time. You can avoid this downtime by performing a blue/green deployment, where you deploy the new version to a separate environment, and then swap CNAMEs of the two environments to redirect traffic to the new version instantly.

Using AWS SCT to convert objects (tables, indexes, constraints, functions, and so on) from the source commercial engine to the open-source engine. Using AWS DMS to move data into the appropriate converted objects and keep the target database in complete sync with the source. Doing this takes care of the production workload while the migration is ongoing.

When an instance is stopped and restarted, the Host affinity setting determines whether it's restarted on the same, or a different, host.

Available Internet Connection Theoretical Min. Number of Days to Transfer 100TB at 80% Network Utilization When to Consider AWS Snowball? T3 (44.736Mbps) 269 days 2TB or more 100Mbps 120 days 5TB or more 1000Mbps 12 days 60TB or more

Amazon WorkSpaces is a managed, secure Desktop-as-a-Service (DaaS) solution. You can use Amazon WorkSpaces to provision either Windows or Linux desktops in just a few minutes and quickly scale to provide thousands of desktops to workers across the globe.

The AWS Security Token Service (STS) is a web service that enables you to request temporary, limited-privilege credentials for AWS Identity and Access Management (IAM) users or for users that you authenticate (federated users)

AWS Batch enables developers, scientists, and engineers to easily and efficiently run hundreds of thousands of batch computing jobs on AWS. AWS Batch dynamically provisions the optimal quantity and type of compute resources (e.g., CPU or memory optimized instances) based on the volume and specific resource requirements of the batch jobs submitted.

For example, assume that you have a load balancer configuration that you use for most of your stacks. Instead of copying and pasting the same configurations into your templates, you can create a dedicated template for the load balancer. Then, you just use the resource to reference that template from within other templates.

AWS CloudHSM is a cloud-based hardware security module (HSM) that enables you to easily generate and use your own encryption keys on the AWS Cloud.

Expedited retrieval allows you to quickly access your data when you need to have almost immediate access to your information. This retrieval type can be used for archives up to 250MB. Expedited retrieval usually completes within 1 and 5 minutes.

TGW coupled with AWS Resource Access Manager will allow you to use a single Transit Gateway across multiple AWS accounts, however, it’s still limited to a single region.

Direct Connect Gateway – DGW DGW builds upon VGW capabilities adding the ability to connect VPCs in one region to a Direct Connect in another region. CIDR addresses cannot overlap. In addition, traffic will not route from VPC-A to the Direct Connect Gateway and to VPC-B. Traffic will have to route from the VPC-A —> Direct Connect —-> Data Centre Router —-> Direct Connect —> VPC-B.

Virtual Private Gateway – VGW The introduction of the VGW introduced the ability to let multiple VPCs, in the same region, on the same account, share a Direct Connect. Prior to this, you’d need a Direct Connect Private Virtual Interface (VIF) for each VPC, establishing a 1:1 correlation, which didn’t scale well both in terms of cost and administrative overhead.  VGW became a solution that reduced the expense of requiring new Direct Connect circuits for each VPC as long as both VPCs were in the same region, on the same account. This construct can be used with either Direct Connect or the Site-to-Site VPN.

AWS VGW vs DGW vs TGW

In general, bucket owners pay for all Amazon S3 storage and data transfer costs associated with their bucket. A bucket owner, however, can configure a bucket to be a Requester Pays bucket. With Requester Pays buckets, the requester instead of the bucket owner pays the cost of the request and the data download from the bucket. The bucket owner always pays the cost of storing data.

When CloudFront receives a request, you can use a Lambda function to generate an HTTP response that CloudFront returns directly to the viewer without forwarding the response to the origin. Generating HTTP responses reduces the load on the origin, and typically also reduces latency for the viewer.

Amazon S3 event notifications are designed to be delivered at least once. Typically, event notifications are delivered in seconds but can sometimes take a minute or longer.

By default, Amazon Redshift has excellent tools to back up your cluster via snapshot to Amazon Simple Storage Service (Amazon S3). These snapshots can be restored in any AZ in that region or transferred automatically to other regions for disaster recovery. Amazon Redshift can even prioritize data being restored from Amazon S3 based on the queries running against a cluster that is still being restored.

For this setup, do the following: 1.    Create a custom AWS Identity and Access Management (IAM) policy and execution role for your Lambda function. 2.    Create Lambda functions that stop and start your EC2 instances. 3.    Create CloudWatch Events rules that trigger your function on a schedule. For example, you could create a rule to stop your EC2 instances at night, and another to start them again in the morning.

Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solutions

FIFO queues also provide exactly-once processing but have a limited number of transactions per second (TPS):

One way to put it is this: LSI - allows you to perform a query on a single Hash-Key while using multiple different attributes to "filter" or restrict the query. GSI - allows you to perform queries on multiple Hash-Keys in a table, but costs extra in throughput, as a result.

Cognito authorizers–Amazon Cognito user pools provide a set of APIs that you can integrate into your application to provide authentication. User pools are intended for mobile or web applications where you handle user registration and sign-in directly in the application.To use an Amazon Cognito user pool with your API, you must first create an authorizer of the COGNITO_USER_POOLS authorizer type, and then configure an API method to use that authorizer. After a user is authenticated against the user pool, they obtain an Open ID Connect token, or OIDC token, formatted in a JSON web token.Users who have signed in to your application will have tokens provided to them by the user pool. Then, your application can use that token to inject information into a header in subsequent API calls that you make against your API Gateway endpoint.The API call succeeds only if the required token is supplied and the supplied token is valid. Otherwise, the client isn't authorized to make the call, because the client did not have credentials that could be authorized.

IAM authorizers–All requests are required to be signed using the AWS Version 4 signing process (also known as SigV4). The process uses your AWS access key and secret key to compute an HMAC signature using SHA-256. You can obtain these keys as an AWS Identity and Access Management (IAM) user or by assuming an IAM role. The key information is added to the Authorization header, and behind the scenes, API Gateway takes that signed request, parses it, and determines whether or not the user who signed the request has the IAM permissions to invoke your API.

Lambda authorizers–A Lambda authorizer is simply a Lambda function that you can write to perform any custom authorization that you need. There are two types of Lambda authorizers: token and request parameter. When a client calls your API, API Gateway verifies whether a Lambda authorizer is configured for the API method. If it is, API Gateway calls the Lambda function.In this call, API Gateway supplies the authorization token (or the request parameters, based on the type of authorizer), and the Lambda function returns a policy that allows or denies the caller’s request.API Gateway also supports an optional policy cache that you can configure for your Lambda authorizer. This feature increases performance by reducing the number of invocations of your Lambda authorizer for previously authorized tokens. And with this cache, you can configure a custom time to live (TTL).To make it easy to get started with this method, you can choose the API Gateway Lambda authorizer blueprint when creating your authorizer function from the Lambda console.

DynamoDB supports two types of secondary indexes: Global secondary index — An index with a partition key and a sort key that can be different from those on the base table. A global secondary index is considered "global" because queries on the index can span all of the data in the base table, across all partitions. A global secondary index is stored in its own partition space away from the base table and scales separately from the base table. Local secondary index — An index that has the same partition key as the base table, but a different sort key. A local secondary index is "local" in the sense that every partition of a local secondary index is scoped to a base table partition that has the same partition key value.

Amazon SQS supports dead-letter queues, which other queues (source queues) can target for messages that can't be processed (consumed) successfully. Dead-letter queues are useful for debugging your application or messaging system because they let you isolate problematic messages to determine why their processing doesn't succeed.

RPO limits how far to roll back in time, and defines the maximum allowable amount of lost data measured in time from a failure occurrence to the last valid backup. RTO is related to downtime and represents how long it takes to restore from the incident until normal operations are available to users

Amazon Lex is a service for building conversational interfaces into any application using voice and text

A company runs a memory-intensive analytics application using on-demand Amazon EC2 C5 compute optimized instance. The application is used continuously and application demand doubles during working hours. The application currently scales based on CPU usage. When scaling in occurs, a lifecycle hook is used because the instance requires 4 minutes to clean the application state before terminating.Because users reported poor performance during working hours, scheduled scaling actions were implemented so additional instances would be added during working hours. The Solutions Architect has been asked to reduce the cost of the application.Which solution is MOST cost-effective?

When a user in an AWS account creates a blockchain network on Amazon Managed Blockchain, they also create the first member in the network. This first member has no peer nodes associated with it until you create them. After you create the network and the first member, you can use that member to create an invitation proposal for other members in the same AWS account or in other AWS accounts. Any member can create an invitation proposal.

AWS Step Functions is a fully managed service that makes it easy to coordinate the components of distributed applications and microservices using visual workflows. Instead of writing a Decider program, you define state machines in JSON. AWS customers should consider using Step Functions for new applications. If Step Functions does not fit your needs, then you should consider Amazon Simple Workflow (SWF)

Workers are programs that interact with Amazon SWF to get tasks, process received tasks, and return the results. The decider is a program that controls the coordination of tasks,

SQS is a fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications. SQS eliminates the complexity and overhead associated with managing and operating message oriented middleware, and empowers developers to focus on differentiating work. Using SQS, you can send, store, and receive messages between software components at any volume, without losing messages or requiring other services to be available.SWF helps developers build, run, and scale background jobs that have parallel or sequential steps. You can think of Amazon SWF as a fully-managed state tracker and task coordinator in the Cloud.

SNS is a distributed publish-subscribe system. Messages are pushed to subscribers as and when they are sent by publishers to SNS. SQS is distributed queuing system. Messages are NOT pushed to receivers. Receivers have to poll or pull messages from SQS.

Amazon SimpleDB passes on to you the financial benefits of Amazon’s scale. You pay only for resources you actually consume. For Amazon SimpleDB, this means data store reads and writes are charged by compute resources consumed by each operation, and you aren’t billed for compute resources when you aren’t actively using them (i.e. making requests).

While SimpleDB has scaling limitations, it may be a good fit for smaller workloads that require query flexibility. Amazon SimpleDB automatically indexes all item attributes and thus supports query flexibility at the cost of performance and scale.

When you create a DynamoDB table, auto scaling is the default capacity setting, but you can also enable auto scaling on any table that does not have it active

An elastic network interface (referred to as a network interface in this documentation) is a logical networking component in a VPC that represents a virtual network card.

Identity-based policies are attached to an IAM user, group, or role. These policies let you specify what that identity can do (its permissions). For example, you can attach the policy to the IAM user named John, stating that he is allowed to perform the Amazon EC2 RunInstances action. The policy could further state that John is allowed to get items from an Amazon DynamoDB table named MyCompany. You can also allow John to manage his own IAM security credentials. Identity-based policies can be managed or inline. Resource-based policies are attached to a resource. For example, you can attach resource-based policies to Amazon S3 buckets, Amazon SQS queues, and AWS Key Management Service encryption keys. For a list of services that support resource-based policies, see AWS Services That Work with IAM.

gp2 is the default EBS volume type for Amazon EC2 instances. These volumes are backed by solid-state drives (SSDs) and are suitable for a broad range of transactional workloads,

st1 is backed by hard disk drives (HDDs) and is ideal for frequently accessed

sequential access device a cassette tape, magnetic discs and optical discs

Intrusion detection and intrusion prevention systems Monitor events in your network for security threats and stop threats once detected.

Amazon Athena is an interactive query service that makes it easy to analyze data in Amazon S3 using standard SQL.

Systems Manager provides a unified user interface so you can view operational data from multiple AWS services and allows you to automate operational tasks across your AWS resources. With Systems Manager, you can group resources, like Amazon EC2 instances, Amazon S3 buckets, or Amazon RDS instances, by application, view operational data for monitoring and troubleshooting, and take action on your groups of resources. Systems Manager simplifies resource and application management, shortens the time to detect and resolve operational problems, and makes it easy to operate and manage your infrastructure securely at scale.

AWS Trusted Advisor is an application that draws upon best practices learned from AWS’ aggregated operational history of serving hundreds of thousands of AWS customers. Trusted Advisor inspects your AWS environment and makes recommendations for saving money, improving system performance, or closing security gaps. 

Your client’s CloudWatch Logs configuration receives logs and data from on-premises monitoring systems and agents installed in operating systems. A new team wants to use CloudWatch to also monitor Amazon EC2 instance performance and state changes of EC2 instances, such as instance creation, instance power-off, and instance termination. This solution should also be able to notify the team of any state changes for troubleshooting.

惊异传奇

Chef and Puppet Puppet is a powerful enterprise-grade configuration management tool. Both Chef and Puppet help development and operations teams manage applications and infrastructure. However they have important differences you should understand when evaluating which one is right for you.

In addition to strings, Redis supports lists, sets, sorted sets, hashes, bit arrays, and hyperloglogs. Applications can use these more advanced data structures to support a variety of use cases. For example, you can use Redis Sorted Sets to easily implement a game leaderboard that keeps a list of players sorted by their rank.

Events can self-trigger based on a schedule; alarms don't do this Alarms invoke actions only for sustained changes Alarms watch a single metric and respond to changes in that metric; events can respond to actions (such as a lambda being created or some other change in your AWS environment) Alarms can be added to CloudWatch dashboards, but events cannot Events are processed by targets, with many more options than the actions an alarm can trigger

SMOKE TESTING is a type of software testing that determines whether the deployed build is stable or not.

Config: understand and monitor your AWS resources. OpsWorks: configure your servers with Chef or Puppet. Very little overlap between the two.

Validating CloudTrail Log File Integrity PDF Kindle RSS To determine whether a log file was modified, deleted, or unchanged after CloudTrail delivered it, you can use CloudTrail log file integrity validation. This feature is built using industry standard algorithms: SHA-256 for hashing and SHA-256 with RSA for digital signing. This makes it computationally infeasible to modify, delete or forge CloudTrail log files without detection. You can use the AWS CLI to validate the files in the location where CloudTrail delivered them.

AWS CloudTrail is mainly concerned with “Who did what on AWS?” and the API calls to the service or resource.AWS CloudWatch is mainly concerned with “What is happening on AWS?” and logging all the events for a particular service or application.

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Server-side rendering

JavaScript XML

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