Configure diagnostics, monitoring and analytics

Question 1

Event Log

Answer 1

Event Log is particularly useful for capturing unhandled exceptions that may have escaped the application’s exception handling logic and surfaced to the web server. Only one XML file is created per website.

Question 2

Web server

Answer 2

Web server logs Web server logs are textual files that create a text entry for each HTTP request to the website.

Question 3

Detailed error message logs

Answer 3

These HTML files are generated by the web server and log the error messages for failed requests that result in an HTTP status code of 400 or higher. One error message is captured per HTML file.

Question 4

Failed request tracing logs

Answer 4

In addition to the error message (captured by detailed error message logs), the stack trace that led to a failed HTTP request is captured in these XML documents that are presented with an XSL style sheet for in-browser consumption. One failed request trace is captured per XML file.

Question 5

Application diagnostic logs

Answer 5

These text-based trace logs are created by web application code in a manner specific to the platform the application is built in

Question 6

Site Control Manager (SCM)

Answer 6

1) Parallel website that is available with every deployed website, providing various management functions
2)

Question 7

Retrieving diagnostic data using Windows PowerShell

Answer 7

1) cmdlets are installed and configured to connect to your subscription
2) Get-AzureWebsiteLog -Name contoso -Tail

Question 8

Retrieving diagnostic data using the xplat-cli

Answer 8

azure site log download
enter just the name (not the full URL),
file named Diagnostic.zip

Question 9

debugging website in azure

Answer 9

When you attach the debugger and pause at a breakpoint, you are stopping the deployed Azure website for all requests
Azure will treat your Websites worker process as having become unresponsive and try to restart it

Question 10

Configuring endpoint monitoring

Answer 10

you leverage a service remote to your website, possibly in multiple regions around the world, to periodically ping your website to assess its health
Endpoint monitoring is available only to websites running in the Standard web hosting plan mode.

Question 11

webjobs

Answer 11

1) run on demand, continuously, or on a predefined schedule with a recurrence
2) enabling you to perform background processing

Question 12

WebJobs SDK binding attributes in C#

Answer 12

1) Blob trigger

2) IQueue trigger

Question 13

Configure websites for scale and resilience

Answer 13

1) Configure auto-scale using built-in and custom schedules
2) Image Configure auto-scale by metric
3) Image Change the size of an instance
4) Image Configure Traffic Manager

Question 14

Configuring auto-scale by metric

Answer 14

1) CPU Percentage
2) Image Memory Percentage
3) Image Disk Queue Length
4) Image Http Queue Length
5) Image Data In Amount of traffic ingress in kilobytes
6) Image Data Out Amount of traffic egress in kilobytes

Question 15

Scope of Auto-Scale

Answer 15

Auto-scale affects the instance count of your web hosting plan and therefore affects all websites hosted within that plan. It does not apply directly to an individual website.

Question 16

Configuring Traffic Manager

Answer 16

Traffic Manager combines endpoint monitoring of your website with DNS so that client traffic is always directed toward a viable endpoint. It is important to understand that traffic does not flow through Traffic Manager to your website endpoint, but rather it is guided to your website endpoint as a result of DNS resolution

Question 17

Custom Domain Names and Traffic Manager

Answer 17

1) custom domain name with Traffic Manager, you must configure the DNS settings for the custom domain to use a CNAME record that maps to the . trafficmanager.net address.

Question 18

A record and Traffic manager

Answer 18

You cannot use an A record to map to an IP address exposed by Traffic Manager. This means that you can only use Traffic Manager for subdomains, such as www.contoso.com and not for contoso.com.

Question 19

Traffic Manager load balancing methods

Answer 19

Failover
Round robin
Performance

Question 20

Failover load balancing

Answer 20

When a DNS query comes in from a client, Traffic Manager picks the first endpoint from the ordered list of endpoints that it determines is healthy based on periodic monitoring of the endpoints.

Question 21

Round robin load balancing

Answer 21

Traffic Manager treats each active endpoint in its list of endpoints equally and tries to evenly distribute traffic among the endpoints in a round-robin fashion.

Question 22

Performance load balancing

Answer 22

e Traffic Manager picks the “closest” endpoint from the configured list of endpoints that should have the lowest latency for the client.

Question 23

Avoiding Cascading Failures

Answer 23

if all the endpoints in the closest datacenter are not available, then Traffic Manager will switch to a round-robin method, distributing traffic to endpoints located in other datacenters to avoid overwhelming the endpoints in the next closest datacenter and potentially causing a chain of failures

Question 24

Design and implement applications for scale and resilience

Answer 24

1) Select a pattern
2) Implement transient fault handling for services and respond to throttling
3) Disable Application Request Routing (ARR) affinity

Question 25

Cloud Patterns websites and webjobs

Answer 25

Static Content Hosting pattern
Cache-Aside pattern
Health Endpoint Monitoring pattern
Compensating Transaction pattern
Command and Query Responsibility Segregation pattern

Question 26

Cloud Patterns webjobs

Answer 26

Competing Consumers pattern
Priority Queue pattern
Queue-Based Load Leveling pattern
Leader Election pattern
Scheduler Agent Supervisor pattern

Question 27

Application Request Routing (ARR)

Answer 27

is a feature of Websites that effectively enables sticky sessions between the client (such as the browser) and the first instance of the website it connects to by providing the client with a cookie that encodes identification for that website instance