Az Web App Slots
2021年5月11日Register here: http://gg.gg/uk0ek
Go to the overview blade of your Web App and select “Deployment Slots” Then Add Slot in the top left corner. Now create a slot called “staging” You can create as many slots as you want. Deployment slots or Azure slots are actually instances of Azure Web Apps which are tied to that website. A deployment slot will carry the name of the Azure Web App + SlotName. For example, if my Azure Web App is called DebDemo and I create a slot called staging, then my slot will be an Azure Web App with the name DebDemo(staging) and its url. When you deploy your web app, web app on Linux, mobile back end, or API app to Azure App Service, you can use a separate deployment slot instead of the default production slot when you’re running in the Standard, Premium, or Isolated App Service plan tier. Deployment slots are live apps with their own host names.App Service Environment (ASE) support for Availability Zones (AZ) is now in preview. Customers can deploy internal load balancer (ILB) ASEs into a specific AZ (Zone 1, 2 or 3) within an Azure region, and the runtime resources used by that ILB ASE will be deployed into the specified AZ. An ILB ASE is deployed in a zonal manner which means the ILB ASE is pinned to a specific zone. This means all of the following runtime ILB ASE resources will be located in the specified zone: the internal load balancer IP address of the ASE, the compute resources used by the ASE to run web applications, and the underlying file content storage for all of the web applications deployed on the ASE. Currently ILB ASEs can be deployed into AZs in the Central US region. The set of available regions for the ASE AZ preview will be expanded over the course of January and February to include all AZ enabled Azure regions. Note that only ILB ASEs support availability zones - there are no plans at this time to enable AZ support for external facing ASEs (i.e. ASEs that have a public IP address for accepting website traffic).Customers can deploy an ASE into an availability zone using ARM templates. The ARM template snippet below shows the new properties and values in bold that tell the platform to deploy the ASE into an availability zone:There are only two minor changes needed in an ILB ASE ARM template to enable zonal deployment. The apiVersion property must be set to 2018-05-01-preview in order for the zones property to be processed. The zones property can be set as shown above with a value of 1, 2 or 3 depending on which zone you want to deploy the ASE into.In order to attain zone resiliency for apps created on AZ deployed ILB ASEs, customers will need to deploy at least two ILB ASEs - one per zone. Customers should then create and publish copies of their application onto each of the AZ deployed ASEs.Customers will additionally need to deploy a load balancing solution upstream of the AZ deployed ASEs so that traffic bound for an application is distributed across all instances of the ASEs. For example a zone-redundant Application Gateway could be deployed upstream, and then configured to route requests for a given application across all of the application instances created on the AZ deployed ASEs. More details on zone-redundant Application Gateway are available here: Autoscaling and Zone-redundant Application Gateway (Public Preview).Once an ASE and its applications are running inside of a specific zone, the applications will continue to run and serve traffic on that ASE even if other zones in the same region suffer an outage. However it is possible that non-runtime behavior including application service plan scaling as well as application creation/configuration/publishing may be impacted in the event of a region outage. Future investments into availability zone support for App Service will eventually extend zone resiliency to these non-runtime behaviors.
Deploying your application automatically on an Azure Web App isn’t really challenging. You have several options to do it (including Web Deploy, Git, FTP..); and several release management services (like Visual Studio Team Services) provide automated tasks for this. But you might run into some issues if you just follow the easy way.The shortest way is still not the best way
You can deploy your application straight to your Azure Web App, but here are the problems you might run into:
*Your deployment package might be large, so the deployment process would be long enough to introduce significant downtime to your application.
*After the deployment, the Web App might need to restart. This results in a cold start: the first request will be slower to process and multiple requests may stack up waiting for the Web App to be ready to process them.
*Your deployment may fail due to files being used by the server processes.
*If your last deployment introduces critical issues, you have no way to quickly rollback to the previous version.
All of these are worth considering if you are alone in your team, and deploy your application to your own private test Web App. But it isn’t exactly the purpose of cloud computing, is it?
I mean, even if you are targeting an integration environment, only used by your kind frontend colleague, you don’t want him to hit a brick wall, waiting for you to fix your API if something got wrong.
And if you are targeting a validation environment, would you like to have your QA open a non-reproductible issue due only to the deployment downtime?
And if you are deploying to your producti.. OK, I think you got my point here, let’s fix it!Blue-Green deployment
Blue-Green deployment is a release approach to reduce downtime by ensuring you have two identical production environments: Blue and Green. At any time one of them is live, serving all production traffic, while the other is just idle.
Let’s say that Blue is currently live.
You can deploy your new release in the environment that is not live, Green in our example. Once your deployment is finished, and your application is ready to serve requests, you can just switch the router so all incoming requests now go to Green instead of Blue.
Green is now live, and Blue is idle.
Credits: BlueGreenDeployment by Martin Fowler.
As well as reducing downtime, the Blue-Green deployment approach reduces risks: if your last release on Green produces unexpected behaviors, just roll back to the last version by switching back to Blue.Deployment slots to the rescue!
The great news is that you have a nice way to implement the Blue-Green deployments for Azure Web Apps: deployment slots (available in the Standard or Premium App Service plan mode).What are deployment slots?
By default, each Azure Web App has a single deployment slot called production which represents the Azure Web App itself.
Tesco christmas priority delivery slots 2018 youtube. You can then create more deployment slots. They are actually live Web App instances with their own hostnames, but they are tied to the main Web App.
In fact, if:
*I have a Web App:
*called geeklearning,
*with default hostname geeklearning.azurewebsites.net,
*and I create a slot:
*named staging,
*its hostname will be geeklearning-staging.azurewebsites.net.
You can easyly swap two slots, including the production one. Swapping is not about copying the content of the website but, as the Blue-Green approach recommends it, it is more about swapping DNS pointers.
When dealing with deployment slots, you should also be aware of how configuration works.
Indeed, some configuration elements will follow the content across a swap while others will stay on the same slot.
Particulary, the app settings and connection strings are swapped by default, but can be configured to stick to a slot.
Settings that are swapped:
*General settings - such as framework version, 32/64-bit, Web sockets
*App settings (can be configured to stick to a slot)
*Connection strings (can be configured to stick to a slot)
*Handler mappings
*Monitoring and diagnostic settings
*WebJobs content
Settings that are not swapped:
*Publishing endpoints
*Custom Domain Names
*SSL certificates and bindings
*Scale settings
*WebJobs schedulersCreate a new slot
To create a new deployment slot, just open your Web App from the Azure Portal and click on Deployment slots, and then Add Slot.
You can choose to clone the configuration from an existing slot (including the production one), or to start with a fresh new configuration.
Once your slot has been created, you can configure it like a normal Web App, and eventually declare some settings as ’Slot setting’ to stick it to your new slot.Successful deployment process
Now that you implement the Blue-Green deployments through Azure Web App Deployment Slots, you resolved almost all issues listed before.
The last one left is that your deployment may fail if a file is currently locked by a process on the Web App. To ensure that this will not happen, it seems safer to stop the Web server before deploying and start it again just after. As you are deploying on a staging slot, there is no drawback doing this!
So, the whole successful deployment process comes down to:
*Stop the staging slot
*Deploy to the staging slot
*Start the staging slot
*Swap the staging slot with the production one
You may leave the staging slot running after the deployment process, to let you swap it back in case of any issues.Deploy from Visual Studio Team Services
Update: there is an easier way to deploy from VSTS now: learn how!
Implementing this deployment process in a VSTS Build or Release definition could be a little bit challenging: as you have a default build task to deploy your application to an Azure Web App, even to a specific slot, you can’t stop, swap or start slots.
Fortunately, you can run PowerShell scripts, and even get them to use an Azure connection configured for your Team Project thanks to the Azure Powershell task.
You then just have to write three PowerShell scripts using the PowerShell Modules for Azure.Az Web App Slots Real MoneyStop Azure Web App Slot
Create a new PowerShell script named StopSlot.ps1, write the following content, and publish it to your source repository:Start Azure Web App Slot
Create a new PowerShell script named StartSlot.ps1, write the following content, and publish it to your source repository:Az Webapp SlotSwap Azure Web App Slots
Create a new PowerShell script named SwapSlots.ps1, write the following content, and publish it to your source repository:Add PowerShell scripts to your build definitionAz Web App Slots No Deposit
You are now ready to edit your Build or Release definition in VSTS to support your successful Azure Web App deployment process:
*Add the three Azure Powershell tasks, one before your Azure Web App Deployment task and two just after
*Configure your tasks
*Azure Connection Type: Azure Classic
*Azure Classic Subscription: Select your configured Azure Classic service (you should have this already configured if you deployed your application to Azure, otherwise learn how to configure it on the VSTS documentation)
*Script Path: Select the path to your script (from sources for a Build, or artifacts for a Release)
*Scripts Arguments: Should match the parameters declared in your scripts, like -WebAppName ’slots-article’ -SlotName ’staging’
You have now a real successful Azure Web App deployment process, automated from Visual Studio Team Services, without downtime or cold start, strong and safe!Web App Fifa 18
Updated: change screenshots to match VSTS and Azure new UIs, add a link to an easier successful Azure Web App deployment process from VSTS
Register here: http://gg.gg/uk0ek
https://diarynote-jp.indered.space
Go to the overview blade of your Web App and select “Deployment Slots” Then Add Slot in the top left corner. Now create a slot called “staging” You can create as many slots as you want. Deployment slots or Azure slots are actually instances of Azure Web Apps which are tied to that website. A deployment slot will carry the name of the Azure Web App + SlotName. For example, if my Azure Web App is called DebDemo and I create a slot called staging, then my slot will be an Azure Web App with the name DebDemo(staging) and its url. When you deploy your web app, web app on Linux, mobile back end, or API app to Azure App Service, you can use a separate deployment slot instead of the default production slot when you’re running in the Standard, Premium, or Isolated App Service plan tier. Deployment slots are live apps with their own host names.App Service Environment (ASE) support for Availability Zones (AZ) is now in preview. Customers can deploy internal load balancer (ILB) ASEs into a specific AZ (Zone 1, 2 or 3) within an Azure region, and the runtime resources used by that ILB ASE will be deployed into the specified AZ. An ILB ASE is deployed in a zonal manner which means the ILB ASE is pinned to a specific zone. This means all of the following runtime ILB ASE resources will be located in the specified zone: the internal load balancer IP address of the ASE, the compute resources used by the ASE to run web applications, and the underlying file content storage for all of the web applications deployed on the ASE. Currently ILB ASEs can be deployed into AZs in the Central US region. The set of available regions for the ASE AZ preview will be expanded over the course of January and February to include all AZ enabled Azure regions. Note that only ILB ASEs support availability zones - there are no plans at this time to enable AZ support for external facing ASEs (i.e. ASEs that have a public IP address for accepting website traffic).Customers can deploy an ASE into an availability zone using ARM templates. The ARM template snippet below shows the new properties and values in bold that tell the platform to deploy the ASE into an availability zone:There are only two minor changes needed in an ILB ASE ARM template to enable zonal deployment. The apiVersion property must be set to 2018-05-01-preview in order for the zones property to be processed. The zones property can be set as shown above with a value of 1, 2 or 3 depending on which zone you want to deploy the ASE into.In order to attain zone resiliency for apps created on AZ deployed ILB ASEs, customers will need to deploy at least two ILB ASEs - one per zone. Customers should then create and publish copies of their application onto each of the AZ deployed ASEs.Customers will additionally need to deploy a load balancing solution upstream of the AZ deployed ASEs so that traffic bound for an application is distributed across all instances of the ASEs. For example a zone-redundant Application Gateway could be deployed upstream, and then configured to route requests for a given application across all of the application instances created on the AZ deployed ASEs. More details on zone-redundant Application Gateway are available here: Autoscaling and Zone-redundant Application Gateway (Public Preview).Once an ASE and its applications are running inside of a specific zone, the applications will continue to run and serve traffic on that ASE even if other zones in the same region suffer an outage. However it is possible that non-runtime behavior including application service plan scaling as well as application creation/configuration/publishing may be impacted in the event of a region outage. Future investments into availability zone support for App Service will eventually extend zone resiliency to these non-runtime behaviors.
Deploying your application automatically on an Azure Web App isn’t really challenging. You have several options to do it (including Web Deploy, Git, FTP..); and several release management services (like Visual Studio Team Services) provide automated tasks for this. But you might run into some issues if you just follow the easy way.The shortest way is still not the best way
You can deploy your application straight to your Azure Web App, but here are the problems you might run into:
*Your deployment package might be large, so the deployment process would be long enough to introduce significant downtime to your application.
*After the deployment, the Web App might need to restart. This results in a cold start: the first request will be slower to process and multiple requests may stack up waiting for the Web App to be ready to process them.
*Your deployment may fail due to files being used by the server processes.
*If your last deployment introduces critical issues, you have no way to quickly rollback to the previous version.
All of these are worth considering if you are alone in your team, and deploy your application to your own private test Web App. But it isn’t exactly the purpose of cloud computing, is it?
I mean, even if you are targeting an integration environment, only used by your kind frontend colleague, you don’t want him to hit a brick wall, waiting for you to fix your API if something got wrong.
And if you are targeting a validation environment, would you like to have your QA open a non-reproductible issue due only to the deployment downtime?
And if you are deploying to your producti.. OK, I think you got my point here, let’s fix it!Blue-Green deployment
Blue-Green deployment is a release approach to reduce downtime by ensuring you have two identical production environments: Blue and Green. At any time one of them is live, serving all production traffic, while the other is just idle.
Let’s say that Blue is currently live.
You can deploy your new release in the environment that is not live, Green in our example. Once your deployment is finished, and your application is ready to serve requests, you can just switch the router so all incoming requests now go to Green instead of Blue.
Green is now live, and Blue is idle.
Credits: BlueGreenDeployment by Martin Fowler.
As well as reducing downtime, the Blue-Green deployment approach reduces risks: if your last release on Green produces unexpected behaviors, just roll back to the last version by switching back to Blue.Deployment slots to the rescue!
The great news is that you have a nice way to implement the Blue-Green deployments for Azure Web Apps: deployment slots (available in the Standard or Premium App Service plan mode).What are deployment slots?
By default, each Azure Web App has a single deployment slot called production which represents the Azure Web App itself.
Tesco christmas priority delivery slots 2018 youtube. You can then create more deployment slots. They are actually live Web App instances with their own hostnames, but they are tied to the main Web App.
In fact, if:
*I have a Web App:
*called geeklearning,
*with default hostname geeklearning.azurewebsites.net,
*and I create a slot:
*named staging,
*its hostname will be geeklearning-staging.azurewebsites.net.
You can easyly swap two slots, including the production one. Swapping is not about copying the content of the website but, as the Blue-Green approach recommends it, it is more about swapping DNS pointers.
When dealing with deployment slots, you should also be aware of how configuration works.
Indeed, some configuration elements will follow the content across a swap while others will stay on the same slot.
Particulary, the app settings and connection strings are swapped by default, but can be configured to stick to a slot.
Settings that are swapped:
*General settings - such as framework version, 32/64-bit, Web sockets
*App settings (can be configured to stick to a slot)
*Connection strings (can be configured to stick to a slot)
*Handler mappings
*Monitoring and diagnostic settings
*WebJobs content
Settings that are not swapped:
*Publishing endpoints
*Custom Domain Names
*SSL certificates and bindings
*Scale settings
*WebJobs schedulersCreate a new slot
To create a new deployment slot, just open your Web App from the Azure Portal and click on Deployment slots, and then Add Slot.
You can choose to clone the configuration from an existing slot (including the production one), or to start with a fresh new configuration.
Once your slot has been created, you can configure it like a normal Web App, and eventually declare some settings as ’Slot setting’ to stick it to your new slot.Successful deployment process
Now that you implement the Blue-Green deployments through Azure Web App Deployment Slots, you resolved almost all issues listed before.
The last one left is that your deployment may fail if a file is currently locked by a process on the Web App. To ensure that this will not happen, it seems safer to stop the Web server before deploying and start it again just after. As you are deploying on a staging slot, there is no drawback doing this!
So, the whole successful deployment process comes down to:
*Stop the staging slot
*Deploy to the staging slot
*Start the staging slot
*Swap the staging slot with the production one
You may leave the staging slot running after the deployment process, to let you swap it back in case of any issues.Deploy from Visual Studio Team Services
Update: there is an easier way to deploy from VSTS now: learn how!
Implementing this deployment process in a VSTS Build or Release definition could be a little bit challenging: as you have a default build task to deploy your application to an Azure Web App, even to a specific slot, you can’t stop, swap or start slots.
Fortunately, you can run PowerShell scripts, and even get them to use an Azure connection configured for your Team Project thanks to the Azure Powershell task.
You then just have to write three PowerShell scripts using the PowerShell Modules for Azure.Az Web App Slots Real MoneyStop Azure Web App Slot
Create a new PowerShell script named StopSlot.ps1, write the following content, and publish it to your source repository:Start Azure Web App Slot
Create a new PowerShell script named StartSlot.ps1, write the following content, and publish it to your source repository:Az Webapp SlotSwap Azure Web App Slots
Create a new PowerShell script named SwapSlots.ps1, write the following content, and publish it to your source repository:Add PowerShell scripts to your build definitionAz Web App Slots No Deposit
You are now ready to edit your Build or Release definition in VSTS to support your successful Azure Web App deployment process:
*Add the three Azure Powershell tasks, one before your Azure Web App Deployment task and two just after
*Configure your tasks
*Azure Connection Type: Azure Classic
*Azure Classic Subscription: Select your configured Azure Classic service (you should have this already configured if you deployed your application to Azure, otherwise learn how to configure it on the VSTS documentation)
*Script Path: Select the path to your script (from sources for a Build, or artifacts for a Release)
*Scripts Arguments: Should match the parameters declared in your scripts, like -WebAppName ’slots-article’ -SlotName ’staging’
You have now a real successful Azure Web App deployment process, automated from Visual Studio Team Services, without downtime or cold start, strong and safe!Web App Fifa 18
Updated: change screenshots to match VSTS and Azure new UIs, add a link to an easier successful Azure Web App deployment process from VSTS
Register here: http://gg.gg/uk0ek
https://diarynote-jp.indered.space
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