by Joe Sondow, Engineering Tools
For the accomplished several years Netflix developers accept been appliance self-service accoutrement to body and arrange hundreds of applications and casework to the Amazon cloud. One of those accoutrement is Asgard, a web interface for appliance deployments and billow management.
Asgard is alleged for the home of the Norse god of barrage and lightning, because Asgard is area Netflix developers go to ascendancy the clouds. I’m blessed to advertise that Asgard has now been accessible sourced on github and is accessible for download and use by anyone. All you’ll charge is an Amazon Web Casework account. Like added accessible antecedent Netflix projects, Asgard is appear beneath the Apache License, Adaptation 2.0. Please feel chargeless to angle the activity and accomplish improvements to it.
Some of the advice in this blog column is additionally appear in the afterward presentations. Note that Asgard was originally alleged the Netflix Appliance Console, or NAC.
To advice bodies analyze assorted types of billow entities, Asgard uses the Tango accessible antecedent figure set, with a few additions. These icons advice authorize a beheld accent to advice bodies accept what they are attractive at as they navigate. Tango icons attending accustomed because they are additionally acclimated by Jenkins, Ubuntu, Mediawiki, Filezilla, and Gimp. Here is a sampling of Asgard’s billow icons.
The Netflix billow archetypal includes concepts that AWS does not abutment directly: Applications and Clusters.
Below is a diagram of some of the Amazon altar appropriate to run a audible front-end appliance such as Netflix’s autocomplete service.
Here’s a quick arbitrary of the relationships of these billow objects.
That’s a lot of being to accumulate clue of for one application.
When there are ample numbers of those billow altar in a service-oriented architectonics (like Netflix has), it’s important for a user to be able to acquisition all the accordant altar for their accurate application. Asgard uses an appliance anthology in SimpleDB and allotment conventions to accessory assorted billow altar with a audible application. Anniversary appliance has an buyer and an email abode to authorize who is amenable for the actuality and accompaniment of the application’s associated billow objects.
Asgard banned the set of acceptable characters in the appliance name so that the names of added billow altar can be parsed to actuate their affiliation with an application.
Here is a screenshot of Asgard assuming a filtered subset of the applications active in our assembly annual in the Amazon billow in the us-east-1 region:
Screenshot of a detail awning for a audible application, with links to accompanying billow objects:
On top of the Auto Ascent Group assemble supplied by Amazon, Asgard infers an article alleged a Array which contains one or added ASGs. The ASGs are associated by allotment convention. Aback a new ASG is created aural a cluster, an incremented adaptation cardinal is added to the cluster’s “base name” to anatomy the name of the new ASG. The Array provides Asgard users with the adeptness to accomplish a deployment that can be formed aback quickly.
Example: During a deployment, array obiwan contains ASGs obiwan-v063 and obiwan-v064. Here is a screenshot of a array in mid-deployment.
The old ASG is “disabled” acceptation it is not demography cartage but charcoal accessible in case a botheration occurs with the new ASG. Cartage comes from ELBs and/or from Discovery, an centralized Netflix annual that is not yet accessible sourced.
One of the primary appearance of Asgard is the adeptness to use the array awning apparent aloft to arrange a new adaptation of an appliance in a way that can be antipodal at the aboriginal assurance of trouble. This adjustment requires added instances to be in use during deployment, but it can abundantly abate the continuance of annual outages acquired by bad deployments.
This activated diagram shows a simplified action of appliance the Array interface to try out a deployment and cycle it aback bound aback there is a problem:
The action illustrates the afterward deployment use case:
Asgard additionally provides an addition deployment arrangement alleged a rolling push. This is agnate to a accepted abstracts centermost deployment of a array on appliance servers. Only one ASG is needed. Old instances get alluringly deleted and replaced by new instances one or two at a time until all the instances in the ASG accept been replaced. Rolling pushes are useful:
Downsides to a rolling push:
Several accepted tasks are congenital into Asgard to automate the deployment process. Here is an action assuming a time-compressed appearance of a 14-minute automatic rolling beforehand in action:
Netflix focuses on the ASG as the primary assemblage of deployment, so Asgard additionally provides a array of graphical controls for modifying an ASG and ambience up metrics-driven auto ascent aback desired.
CloudWatch metrics can be called from the absence provided by Amazon such as CPUUtilization, or can be custom metrics appear by your appliance appliance a library like Servo for Java.
The AWS Administration Animate has its uses for addition with your Amazon annual countersign who needs to configure article Asgard does not provide. However, for accustomed all-embracing operations, the AWS Administration Animate has not yet met the needs of the Netflix billow acceptance model, so we congenital Asgard instead. Here are some of the reasons.
When appliance billow services, it’s important to accumulate a lid on your costs. As of June 5, 2012, Amazon now provides a way to clue your account’s accuse frequently. This abstracts is not apparent through Asgard as of this writing, but addition in your aggregation should accumulate clue of your billow costs regularly. See http://aws.typepad.com/aws/2012/06/new-programmatic-access-to-aws-billing-data.html
Starting up Asgard does not initially account you to acquire any Amazon charges, because Amazon has a chargeless bank for SimpleDB acceptance and no accuse for creating Security Groups, Barrage Configurations, or abandoned Auto Ascent Groups. However, as anon as you access the admeasurement of an ASG aloft aught Amazon will activate charging you for instance usage, depending on your cachet for Amazon’s Chargeless Acceptance Tier. Creating ELBs, RDS instances, and added billow altar can additionally account you to acquire charges. Become accustomed with the costs afore creating too abounding things in the cloud, and bethink to annul your abstracts as anon as you no best charge them. Your Amazon costs are your own responsibility, so run your billow operations wisely.
Cost references: http://aws.amazon.com/ec2/pricing/
By amazing coincidence, Thor and Thor: Tales of Asgard are now accessible to watch on Netflix streaming.
Asgard has been one of the primary accoutrement for appliance deployment and billow administration at Netflix for years. By absolution Asgard to the accessible antecedent association we achievement added bodies will acquisition the Amazon billow and Auto Ascent easier to assignment with, alike at ample calibration like Netflix. Added Asgard appearance will be appear regularly, and we acceptable accord by users on GitHub.
Follow the Netflix Tech Blog and the @NetflixOSS cheep augment for added accessible antecedent apparatus of the Netflix Billow Platform.
If you’re absorbed in alive with us to break added of these absorbing problems, accept a attending at the Netflix jobs folio to see if article ability clothing you. We’re hiring!
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