Showing posts with label S3. Show all posts
Showing posts with label S3. Show all posts

November 29, 2022

Top 20 AWS CodeGuru Interview Questions and Answers

 

Amazon CodeGuru is a developer tool that offers insightful suggestions to enhance code quality and pinpoint the most expensive lines of code in an application. Integrate CodeGuru into your current software development workflow to automate code reviews throughout application development, continuously track the performance of applications in use, and provide visual cues and recommendations on how to enhance code quality, accelerate applications, and lower overall costs.

 

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Ques. 1): How do I sign up for the Amazon CodeGuru Reviewer programme?

Answer:

To incorporate Amazon CodeGuru Reviewer recommendations into your code pull requests, go to the Amazon CodeGuru portal. To begin receiving suggestions from Amazon CodeGuru Reviewers, go to the CodeGuru interface and follow the instructions to link your AWS CodeCommit, GitHub, GitHub enterprise, and BitBucket repositories. As soon as it is turned on, Amazon CodeGuru Reviewer will automatically make wise suggestions as comments on the pull requests you create for the connected repositories.

 

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Ques. 2): How is CodeGuru Reviewer's open-source code analysis software integrated?

Answer:

Amazon Rules from three sources are incorporated by CodeGuru Reviewer. (2) A managed version of Bandit, an open source code analysis tool designed to find security issues in Python code, is integrated into CodeGuru Reviewer (3) A managed version of Infer, an open source code analysis tool designed to find concurrency and other issues in Java code, is also integrated (4). CodeGuru Reviewer rules are integral to the service and designed to use machine learning and automated reasoning to analyse code for code quality and security issues. CodeGuru Reviewer has a straightforward pricing structure that incorporates all studies carried out and examines your code using rules from all sources (as appropriate to the programming language).

 

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Ques. 3): What kinds of problems does the Amazon CodeGuru Reviewer Security Detector pick up?

Answer:

 

You can get assistance with five different types of code security issues from CodeGuru Reviewer: (1) When accessing the APIs of various AWS services, such as AWS EC2 and KMS, you can follow the security best practises by consulting the AWS API Security Best Practices. (2) You may verify popular Java cryptography libraries like Javax using the Java and Python Crypto Library Best Practices. Python's Crypto.Cipher and any other built-in or external hashing or crypto modules (such as cryptography) should be initialised and invoked properly. (3) Cross-site scripting, LDAP injection, and route traversal injection are a few security concerns specific to online apps that Secure Web Applications can help you check for. (4) Internal security knowledge is brought through AWS Security Best Practices, such as AWS Crypto recommendations, to your use cases.


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Ques. 4): How can my CI/CD workflow be improved by using CodeGuru?

Answer:

You can quickly automate the code review process for both code quality and security recommendations by incorporating CodeGuru Reviewer into your CI/CD workflow. You can set it up to run during planned pipeline runs, pull/merge requests, or push. The integration makes sure you never miss a suggestion and are always keeping an eye on the quality of your code and any potential security flaws.


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Ques. 5): I've already included a lot of logging into my code. Do I need to profile anymore?

Answer:

Because logging can only monitor latency (not CPU utilisation) and is labor-intensive to implement because developers must log every function in an application (without affecting application performance), it is only useful for a small number of scenarios, leaving developers without the resources they need to effectively monitor and troubleshoot applications in production. Here's where profiling is useful: Amazon Regardless of scenarios, CodeGuru Profiler is made to gather information on everything that transpired during that application's activity. Code patterns in your live application that affect performance are automatically found by CodeGuru Profiler using a knowledge base of frequently encountered performance inefficiencies.


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Ques. 6): What is the operation of Amazon CodeGuru Profiler?

Answer:

An agent, the profiler service, and intelligent recommendations make up Amazon CodeGuru Profiler. The agent operates as an in-process thread as a component of your application and is launched along with it via the command line. Every five minutes, it sends data from each of your agent-running service instances to the profiler service, which aggregates it. The profile data is then made available by Amazon CodeGuru Profiler in the form of interactive flame graphs, allowing you to see how well your application is doing. Additionally, Amazon CodeGuru Profiler regularly analyses the profiled data, compares it to Amazon and performance engineering best practises, and proactively notifies you of performance issues with wise advice. It also uses machine learning to continuously analyze application runtime data and alerts when it detects anomalies in the application profile and points to the anomalous lines of code.

 

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Ques. 7): What can I do with information from a heap summary?

Answer:

Two situations make advantage of heap summarization. You can first look for potential memory leaks. A leak that could result in out-of-memory issues and programme crashes may be indicated by a steadily rising memory use curve for one or more object types. When you want to reduce the memory footprint of your programme, that is the second situation. You can choose where to focus in this situation by looking at the breakdown of memory usage by object type. For instance, you can concentrate your research and optimization efforts on the areas of your application that are in charge of allocating and referring objects of a given kind if you are aware that an unexpectedly high amount of memory has been associated with a particular object type.


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Ques. 8): What is Amazon CodeGuru capable of?

Answer:

Both Amazon CodeGuru Reviewer and Amazon CodeGuru Profiler are parts of Amazon CodeGuru. To enhance the quality of the code, Amazon CodeGuru Reviewer employs machine learning and automated reasoning to spot key problems and obscure defects throughout application development. With its ability to pinpoint the most expensive lines of code and optimise performance for applications operating in production, Amazon CodeGuru Profiler considerably lowers operational costs.


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Ques. 9): Amazon CodeGuru Reviewer: What is it?

Answer:

An automatic code review service called Amazon CodeGuru Reviewer finds serious errors and breaks from industry standards in Java and Python programming. It reads the lines of code contained in a pull request and offers insightful recommendations based on best practises discovered from both the Amazon codebase and significant open source projects. Amazon CodeGuru Reviewer offers actionable suggestions for enhancing code quality and effortlessly interacts with current code review workflows on popular source control platforms like GitHub, GitHub Enterprise, Bitbucket, and AWS CodeCommit.

 

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Ques. 10): The operation of the Amazon CodeGuru Reviewer Security Detector.

Answer:

The CodeGuru Reviewer Security Detector analyses code statically to provide a control-flow diagram of every potential execution scenario. Once data flow across the control-flow graph has been detected, possible problems requiring long sequences of operations involving several methods and classes may be found. For instance, even though initialization and use take place in different ways, the security detector can tell whether Javax.Crypto.KeyGenerator or Python's crypto.secrets, both of which are symmetric secret key generators, are initialised before use.

 

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Ques. 11): What is a profiling group?

Answer:

A logical grouping you make up is a profiling group. It serves as the limit of a single application. For instance, a profiling group in a microservices architecture would combine the profiles of the microservices you have given to it and create a single profile for all of them.

 

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Ques. 12): What effects does CodeGuru Profiler have on the efficiency of programmes running on AWS Lambda?

Answer:

The agent for Amazon CodeGuru Profiler makes use of the CPU and memory resources allotted to AWS Lambda operations. It is optimised to have a negligible effect on the performance of your programme while it is running as an in-process thread. Consider raising the resources if your application uses the majority of them in an AWS Lambda function so that the agent can operate as intended.

 

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Ques. 13): What details about memory profiling can Amazon CodeGuru Profiler offer?

Answer:

In CodeGuru Profiler, heap summary data is provided. Heap summaries provide a consolidated view of memory usage per object type (such as String, int, char[]), and custom types, over a specified period of time (usually 5 minutes). CodeGuru keeps track of both the total number of objects and their sizes. The timeline graph used to display these metrics makes it simple to see memory use trends and peaks by object type.

 

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Ques. 14): What kinds of problems does the Amazon CodeGuru Reviewer find?

Answer:

The Amazon CodeGuru Reviewer scans concurrent code for concurrency problems, potential race circumstances, malicious or unsanitized inputs, improper handling of sensitive data like credentials, resource leaks, and race conditions and deadlocks. Additionally, it recommends best practises for using AWS, Java, and Python and finds duplicate code that might be unified for improved code maintainability.

 

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Ques. 15): What distinguishes the Amazon CodeGuru Profiler from standard APMs and standalone profilers?

Answer:

Traditional APMs offer helpful information on application performance, monitoring, and tracing. These APM capabilities are complemented by Amazon CodeGuru Profiler, which offers visualisations of the application's runtime data in addition to suggestions for fixing any performance issues it finds. Additionally, it makes use of machine learning to find and notify you to anomalies in your application profile and identify the offending lines of code. Without having a strong expertise in performance engineering, you may use Amazon CodeGuru Profiler to quickly identify the areas of code that provide the most potential for speed optimization and cost reductions and obtain advice on how to address them. AWS Lambda, EC2 instances, containers, and on-premises serverless computing platforms are all profiled by Amazon CodeGuru Profiler. Additionally, while Amazon CodeGuru Profiler was created to run continuously in production, under production traffic levels, and without affecting the application, other standalone profilers are only intended to run in test environments. This is helpful when resolving operational problems in the field, especially those that arise while using bare metal hosts.

 

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Ques. 16): Can I use the same application to obtain CPU and memory information?

Answer:

Yes, CodeGuru Profiler will begin collecting CPU and memory information for your programme as soon as you enable memory profiling and begin profiling. For a certain application, all the CPU and memory data can be obtained from a single profiling group.

 

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Ques. 17): Is my code accessible to Amazon CodeGuru Reviewer?

Answer:

To produce recommendations, Amazon CodeGuru Reviewer requires read-only access to your code. Our top priorities are your trust, privacy, and the security of your content. To prevent unauthorised access to or disclosure of your content and to make sure that our use conforms with our promises to you, we put in place the necessary safeguards, including encryption in transit.

 

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Ques. 18): Which application categories may I profile?

Answer:

Apps hosted on Amazon EC2, containerized applications running on Amazon ECS and Amazon EKS, as well as serverless applications running on AWS Fargate and AWS Lambda, are all compatible with Amazon CodeGuru Profiler. Additionally, you can use Amazon CodeGuru Profiler locally.

 

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Ques. 19): How is the Amazon CodeGuru Reviewer taught to provide wise suggestions?

Answer:

Rule mining and supervised machine learning models that combine logistic regression and neural networks are used to train the Amazon CodeGuru Reviewer.

For instance, the Amazon CodeGuru Reviewer scrapes Amazon code bases using search techniques and location-sensitive models to look for pull requests that contain AWS API calls when training for divergence from AWS best practises. It examines code modifications meant to raise the level of the code and compares them to information in the documentation. As a result, when Reviewer examines your code, it generates a new set of guidelines that it suggests to you as best practises.

 

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Ques. 20): Why should I utilise the security detector for Amazon CodeGuru Reviewers?

Answer:

It's like having a security expert evaluate your code 24/7 using CodeGuru Reviewer Security Detector. Before deployment, it aids in identifying security best practises.

 

 

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November 14, 2022

Top 20 AWS Lightsail Questions and Answers

 

 

For developers, small enterprises, students, and other customers that want a solution to create and run their applications in the cloud, Amazon Lightsail is a virtual private server (VPS) provider and the simplest method to get started with AWS. Developers may install and manage websites and web applications in the cloud using Lightsail's computing, storage, and networking capability. For a cheap, dependable monthly cost, Lightsail offers everything you need to swiftly begin your project, such as virtual machines, containers, databases, CDN, load balancers, DNS management, etc.

 

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Ques. 1): How effective are Lightsail instances?

Answer:

AWS particularly designed Lightsail instances for usage with web servers, developer environments, and tiny databases. Such tasks occasionally require a performance burst but do not frequently or routinely demand the entire CPU. Burstable performance instances, which Lightsail employs, offer a basic amount of CPU performance with the option to burst over it. This approach protects you from the inconsistent performance or other frequent negative effects that you may normally see from over-subscription in other situations while enabling you to obtain the performance you need, when you need it.

Use Amazon EC2 if you want highly customizable settings and instances with consistently good CPU performance for applications like video transcoding or HPC workloads.

 

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Ques. 2): How do DNS records work?

Answer:

DNS is a widely used service that converts domain names like www.example.com into the numerical IP addresses used by computers to communicate to one another, such as 192.0.2.1. You may quickly link the public IPs of your Lightsail instances to your registered domain names, such as photos.example.com. In this way, Lightsail automatically converts human readable names like example.com that people put into their browsers into the IP of the instance you wish to send them to. These translations are all referred to as DNS queries.

It's crucial to understand that you must register a domain in Lightsail before using it. You can register new domains using Amazon Route 53, or your preferred DNS registrar.


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Ques. 3): What can I do in Lightsail using tags?

Answer:

With tags, you can categorise and filter your resources in the Lightsail interface and API, keep track of and arrange your charges in your bill, and set access management rules to control who may see or alter your resources. With the use of tags, you can:

Organize - View and manage resources based on the tags you've given them using the Lightsail interface and API filters. This is helpful if you have a lot of resources of the same type since you can easily recognise a particular resource based on the tags you've given it.

Cost-allocate - By identifying your resources and setting "cost allocation tags" in the billing interface, you may track and distribute expenses across various projects or users. You may, for instance, break out your bill and analyse your expenditures by client or project.

Using AWS Identity and Access Management rules, you can manage access and limit who may create, update, and remove Lightsail resources. You can work more effectively with people on projects without having to grant them complete access to your Lightsail resources thanks to this.


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Ques. 4): A Lightsail instance is what?

Answer:

A Lightsail instance is an AWS Cloud-based virtual private server (VPS). Utilize your Lightsail instances to run code, store data, and create webpages or web apps. Both public (Internet) and private (VPC) networking options are available for your instances to use when connecting to one another and to other AWS services. From the Lightsail console, you can simply create, manage, and connect to instances.


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Ques. 5): What are photographs?

Answer:

Point-in-time backups of instances, databases, or block storage devices are known as snapshots. You may take a snapshot of your resources at any moment, or you can instruct Lightsail to take snapshots for you by turning on automatic snapshots for instances and discs. Snapshots can be used as starting points for building new resources or when backing up data. All the information required to recover your resource is in a snapshot (from the moment when the snapshot was taken). The rebuilt resource starts out as an identical clone of the old resource that was used to construct the snapshot when you restore a resource by building it from a snapshot.

You can manually take snapshots of your Lightsail instances, disks, and databases, or you can use automatic snapshots to instruct Lightsail to take daily snapshots of your instances and disks automatically.


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Ques. 6): Where can I find a Lightsail instance?

Answer:

With SSH access for Linux/Unix-based instances and RDP access for Windows-based instances, Lightsail provides a 1-click secure connection to your instance's terminal straight from your browser. Launch your instance control panels, select Connect using SSH or Connect using RDP, and a new browser window will open with your instance already connected. This is known as 1-click connections.

Lightsail will handle the saving and administration of your SSH keys for you and give you a safe key to use in your SSH client if you wish to connect to your Linux/Unix-based instance using your own client.

 

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Ques. 7): A Lightsail instance plan: what is it?

Answer:

A Lightsail package, also known as a bundle, contains an SSD-based virtual private server, SSD-based storage, and a data transfer allowance. The virtual private server has a defined quantity of RAM and vCPUs. Additionally, the Lightsail plans provide DNS control and five static IP addresses per account (3 domain zones per account). Plans with Lightsail are only paid for when you use them because they are hourly, on-demand fees.


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Ques. 8): What are the maintained databases at Lightsail?

Answer:

The managed databases offered by Lightsail are instances that are solely used to operate databases rather than other workloads like web servers, mail servers, etc. The same tools and programmes you use to access a stand-alone database may also be used to access a Lightsail database, which can contain many user-created databases. Lightsail keeps your database's operating system and underlying infrastructure safe and secure so that you may administer a database without having a strong background in infrastructure management. Lightsail databases have a defined amount of memory, processing power, and SSD-based storage that you can scale up over time, much like standard Lightsail instances. Your selected database will be installed and configured for you by Lightsail immediately after it is created.


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Ques. 9): What can I do with the block storage in Lightsail?

Answer:

Similar to an individual hard drive, Lightsail block storage offers extra storage volumes (referred to as "connected discs" in Lightsail) that you may attach to your Lightsail instance. Applications and software that need to split off specialised data from their core services can benefit from attached discs. They can also be used to preserve application data in the event that your instance and system disc experience a failure or other problem. Applications or software that often access their stored data might benefit from the constant performance and reduced latency provided by attached drives.

Solid-state discs are used in Lightsail block storage (SSD). This kind of block storage aims to handle the great majority of Lightsail workloads by balancing affordability and performance. Adopt EC2 with GP2 or Provisioned IOPS SSD storage in place of Lightsail for clients whose applications need consistent IOPS performance, high throughput per disc, or are running sizable databases like MongoDB, Cassandra, etc.

 

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Ques. 10): What distinguishes halting from deleting my instance?

Answer:

Your instance is shut down when you stop it, but it is still switched on and ready for you to restart it whenever you choose. It is advised to use static IPs for instances that must maintain the same IP after they cease since stopping your instance would relinquish its public IP.

Your instance will be deleted, which is a detrimental operation. Your instance data will all be lost and unrecoverable unless you have taken an instance snapshot. Both the instance's public and private IP addresses will be made public. If you were utilising a static IP with that instance, it stays in your account but is detachable.


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Ques. 11):  What aspects of my managed database does Lightsail handle for me?

Answer:

Your database's core architecture and a variety of maintenance tasks are managed by Lightsail. To assist prevent data loss or component failure, Lightsail automatically backs up your database and offers point-in-time recovery using the database restore tool for the last seven days. Additionally, Lightsail automatically encrypts your data while it is in transit and at rest for improved protection. It also saves your database password for quick and safe database connections. On the maintenance front, Lightsail performs database maintenance within the designated maintenance time. The administration of the operating system and underlying infrastructure, as well as automated updates to the most recent minor database version, are all included in this maintenance.

 

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Ques. 12):  In Lightsail, how do I utilise IPs?

Answer:

An automated private IP address and a public IP address are assigned to each Lightsail instance. The private IP can be used to send data secretly and without cost between Lightsail instances and AWS services. You may connect to your instance from the Internet using the public IP, for example, by using a registered domain name or an SSH or RDP connection from a local computer. The public IP may be replaced with a static IP address by adding a static IP to the instance, which will remain the same even if you stop and restart the instance.


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Ques. 13):  Does Amazon Lightsail offer alerting and monitoring capabilities?

Answer:

Yes. You may get statistics on a variety of resources, such as databases, load balancers, and instances, using Amazon Lightsail. You can set up a maximum of two alert thresholds for each statistic for every given resource. If the alert threshold is crossed, you will be notified via the Lightsail console and, if you so desire, you will also receive an email and/or SMS. The warning and monitoring functionality of Lightsail is free; however, your cell carrier may impose SMS message fees.


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Ques. 14):  What is Lightsail good for?

Answer:

You may select from a number of preconfigured VPS plans that come with everything you want for simple application deployment and management. Lightsail is best suited for customers that want a straightforward administration interface and projects that call for a few virtual private servers. Running websites, web apps, blogs, e-commerce sites, basic software, and more are examples of common use cases for Lightsail.

 

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Ques. 15):  When I remove my managed database, what happens to my data?

Answer:

Your database itself and its automated backups will be destroyed if you delete your managed database. This information cannot be recovered unless you manually snapshot your database before deleting it. Lightsail offers a one-click option to take a manual snapshot during the deletion of your database, if requested, to assist prevent unintentional data loss. Although it is optional, manually taking a picture before deletion is strongly advised. When you no longer require the recorded data, you can erase your manual snapshot.

 

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Ques. 16):  How can I use the distributions from the Lightsail CDN?

Answer:

By storing and providing the material on Amazon's worldwide delivery network, which is powered by Amazon CloudFront, Lightsail content delivery network (CDN) distributions make it simple for you to expedite the delivery of content housed on your Lightsail resources. By offering quick SSL certificate generation and hosting, distributions also assist you in making your website HTTPS-compatible. Distributions can also assist your website endure significant traffic surges and lessen the strain on your Lightsail resources. Like all of Lightsail's capabilities, setup only requires a few clicks, and the cost is a straightforward monthly fee.

 

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Ques. 17):  What settings do I need to make so that my apex domain points to my Lightsail distribution?

Answer:

You must make an ALIAS record in your domain's domain name system (DNS) that translates your apex domain to your distribution's default domain in order to direct your apex domain to your CDN distribution. If your DNS hosting provider does not allow ALIAS records, you may easily arrange your apex domain to refer to the domain of your distribution by using Lightsail DNS zones.

 

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Ques. 18):  What can I do with the container services from Lightsail?

Answer:

Running containerized apps in the cloud is made simple by Lightsail container services. Simple web apps and multi-tiered micro services are both capable of running on a container service. You just need to supply the container image, scalability (number of nodes), and power (CPU, RAM) needed for your container service. Without you needing to handle any underlying infrastructure, Lightsail manages the container service. You will be given a load-balanced TLS endpoint by Lightsail to access the application that is being used by the container service.

 

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Ques. 19):  What kind of usage does Lightsail CDN encourage?

Answer:

Amazon To make the cost of utilising the service straightforward and predictable, Lightsail CDN distributions are built using fixed-priced bundles of data transport. A month's worth of consumption is covered by a distribution package. Distribution bundles may not be used for purposes other than those for which they were designed, such as repeatedly upgrading or downgrading bundles or employing an abnormally high volume of distributions from a single origin. Workloads that need a lot of requests per second or a lot of streaming video are also not allowed. Your data services or account may be throttled or suspended if you engage in these actions.

 

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Ques. 20):  What's the difference between removing my container service and halting it?

Answer:

Your container nodes are in a disabled state when you disable your container service, and the public endpoint of the service returns an HTTP status code of '503'. The service returns to the most recent active deployment when it is enabled. Configurations for power and scalability are also kept. Following re-enabling, the public endpoint's name remains unchanged. Container images and deployment history are kept.

You are acting destructively when you remove your container service. All of the service's container nodes will be permanently destroyed. Additionally, your service's container images, deployment history, logs, and HTTPS public endpoint address will all be permanently erased. It is impossible for you to get the endpoint address back.


 

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