Continuous Deployment to Build Trust CHRIS WELDON PRINCIPAL CONSULTANT IMPROVING ENTERPRISES 

Chris Weldon u  Principal Consultant u  Microsoft MVP u  Slings Code in C# and PHP u  Systems Administrator devops u  [email protected] u  @neraath 

And now for something completely different 

As a conference presenter, I would like a web site with upcoming conferences, so I can stay in-the-know on the conference circuit. 

As a conference presenter, I would like to see a list of upcoming conferences, so that I know what to submit presentations for. 

Our Journey Current Continuous Deployments 

On Modularity… 

In Business 

We Develop Software 

When developing software… 

We often try as a team… 

But are often racing the clock… 

So we rush Apps to Production. 

This cycle repeats and we make Frequent Changes to Production. 

And Our Apps Repeatedly Break 

When stuff breaks… The business gets mad! 

They start to see us as “rogues” 

And institute gates to stop this “bad” activity 

Gates are typically nothing more than 

Why? 

It’s about Trust. 

How do we rebuild trust? 

Back to basics. 

We write software to support the business. 

Or software is the business. 

We need to adapt to changes in business needs. 

We need to (rapidly) fix bugs. 

We properly test first. 

In order to maintain stability… 

…we should have slow, continuous evolution of features. 

So how do we support these goals? 

Strive for technical excellence! 

Remember to test! 

We should constantly integrate all changes back into mainline. 

requent Deployments Amount of Change Inf F 

Automate Deployments 

Our Journey Current Continuous Deployments Automation 

Technical Excellence 

Let’s talk about your databases… 

As a conference organizer, I would like conferences I create to persist beyond my session so that other users can see upcoming conferences. 

Is your DBA’s idea of SQL Management pitching him a SQL script to run? 

That’s not automation. 

Solution: Migrations u  Entity Framework Code-First Migrations u  Migrator.NET u  RoundhousE u  And many more… 

       public  class  Conference          {                  public  int  Id  {  get;  set;  }                  [Required]                  public  string  Name  {  get;  set;  }          } 

       public  partial  class  Initial  :  DbMigration          {                  public  override  void  Up()                  {                          CreateTable(                                  "dbo.Conferences",                                  c  =>  new                                          {                                                  Id  =  c.Int(nullable:  false,  identity:  true),                                                  Name  =  c.String(nullable:  false),                                          })                                  .PrimaryKey(t  =>  t.Id);                                            }                                    public  override  void  Down()                  {                          DropTable("dbo.Conferences");                  }          } 

       public  class  Conference          {                  public  int  Id  {  get;  set;  }                  [Required]                  public  string  Name  {  get;  set;  }                  [Required]                  public  string  Description  {  get;  set;  }                  public  DateTime  StartTime  {  get;  set;  }                  public  DateTime  EndTime  {  get;  set;  }          } 

       public  partial  class  DescriptionAndDates  :  DbMigration          {                  public  override  void  Up()                  {                          AddColumn("dbo.Conferences",  "Description",  c  =>  c.String(nullable:  false));                          AddColumn("dbo.Conferences",  "StartTime",  c  =>  c.DateTime(nullable:  false));                          AddColumn("dbo.Conferences",  "EndTime",  c  =>  c.DateTime(nullable:  false));                  }                                    public  override  void  Down()                  {                          DropColumn("dbo.Conferences",  "EndTime");                          DropColumn("dbo.Conferences",  "StartTime");                          DropColumn("dbo.Conferences",  "Description");                  }          } 

Migrations Demo Demo 

Configuration Management 

As a systems administrator, I would like enable caching of conferences from the database so that we can minimize the impact of querying the database. 

Scenario: Multiple web applications u  CritterMatch Core Business Libraries (CMCBL) u  CritterMatch.com depends on: u  log4net v1.0.6 u  Entity Framework v4 u  ASP.Net Web API v1.0.0 u  CMCBL v1.0.0 u  CritterMatch Business Services depends on: u  log4net v1.2.1 u  Entity Framework v5 u  ASP.Net Web API v1.2.2 u  CMCBL v1.1.0 

NuGet 

Scenario: Multiple web applications u  CritterMatch.com u  Developer Workstations u  Integration/QA u  Staging u  Production u  CritterMatch Business Services u  Developer Workstations u  Integration/QA u  Production – Client A u  Production – Client B 

Configuration Management u  Configurations likely to change: u  Database Connection Strings u  Web Service Connection Endpoints u  Authorized Users? u  Requirements Management u  Different views or behaviors u  Dependency Injection? u  Often times a configuration change, too. 

Configuration Management Strategies 

                                                                                  web.config 

web.config Transforms                                                                                                         

Logging and Monitoring Strategies 

Better Know a Framework 

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PIC: Scaling 

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PIC: False Positive 

Making Logging Useful to Ops & Engineering u  Ops needs to know: u  Network connection problems u  Load problems u  Service/dependency outages u  Consider surfacing events to event log for ops, leaving log files to devs u  Engineering needs to know: u  Everything that ops needs to know u  Performance 

Debug is never for production u  Not constantly, that is. u  If you are trying to debug the production database query, you’re doing it wrong. u  If you are trying to figure out the object model being sent to the view, you’re doing it wrong. u  If you are trying to debug the workflow of your application, you’re doing it wrong. u  The highest level of constant production logging should be INFO. u  Info serves for interactions between customers and your site. u  Info surfaces information customers have requested, but never the interactions of your code. 

Exception Management u  Don’t always surface exceptions to your Event Log if Ops is monitoring u  Boy Who Cried Wolf u  Be meticulous about which exceptions are surfaced out of your application u  Exceptions are expensive 

Demo 

During Deployments 

Continuous Deployment = Release to Production After Every Commit? 

We don’t want to be rogues… 

Release Management u  How to manage multiple environments? u  Builds for Each Environment u  Versioning 

devops u  The collaboration, communication, and integration between developers and operations to reduce the friction of getting software releases into production. 

Production Push/Pull 

CI Push 

But how do we establish trust? 

Our Journey Current Continuous Deployments Automation Testability 

Unit Tests? 

What about your UI? 

What about dependency or component failure? 

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Smoke Tests! 

Behavioral/Acceptance Tests 

Gherkin Feature:  CreateConference   As  a  conference  organizer   I  would  like  to  create  a  conference   So  that  I  can  manage  the  details  of  the  conference.       Scenario:  Attempting  to  create  a  conference  without  times  throws  a  validation  error   Given  I  submit  the  Name  of  the  conference  as  AgileDotNet   When  I  create  the  conference   Then  I  should  get  a  validation  error     Scenario:  Creating  a  conference  with  name  and  times  creates  the  conference   Given  I  submit  the  Name  of  the  conference  as  AgileDotNet   And  I  submit  the  Description  of  the  conference  as            "Great  content  blending  the  world  of  Agile  with  DotNet  development"   And  I  submit  the  StartTime  of  the  conference  as  2013-­‐05-­‐17  08:00:00   And  I  submit  the  EndTime  of  the  conference  as  2013-­‐05-­‐17  18:00:00   When  I  create  the  conference   Then  I  should  get  the  status  code  Created   

[Given("I  submit  the  (.*)  of  the  conference  as  (.*)")]   public  void  GivenIHaveSubmittedConferenceInformation(string  field,  string  value)   {          var  conferenceType  =  typeof  (Conference);          var  fieldInfo  =  conferenceType.GetProperty(field);          if  (fieldInfo  ==  null)  throw  new  Exception("No  field  by  name  "  +  field  +  "  found.");            if  (fieldInfo.PropertyType  ==  typeof(DateTime))                  fieldInfo.SetValue(ConferenceToSubmit,  DateTime.Parse(value));          else                  fieldInfo.SetValue(ConferenceToSubmit,  value);   } 

[When("I  create  the  conference")]   public  void  WhenICreateTheConference()   {          try          {                  Result  =  Controller.Post(ConferenceToSubmit);          }          catch  (Exception  e)          {                  Result  =  e;          }   } 

[Then("I  should  get  the  status  code  (.*)")]   public  void  IShouldGetAStatusCode(string  statusCodeName)   {          Assert.IsInstanceOfType(typeof(HttpResponseMessage),  Result,  "Expected  an   HttpResponseMessage.");          var  message  =  (HttpResponseMessage)Result;          HttpStatusCode  statusCode;          Enum.TryParse(statusCodeName,  true,  out  statusCode);          Assert.AreEqual(statusCode,  message.StatusCode);   } 

Strive for user scenario testing… 

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Still having trust issues? 

Our Journey Current Continuous Deployments Automation Testability Manageable 

Gated deployments 

Rollback Techniques 

Let’s see it! 

Test labs 

Behavior Driven Infrastructure 

Our Journey Current Continuous Deployments Automation Testability Manageable Approvals 

“Red Tape” 

We want to be heroes… 

But many of us are just a bunch of geeks… 

How do we meet their needs? 

How do we get everyone on board? 

Take it one step at a time… 

Our Journey Current Continuous Deployments Automation Testability Manageable Approvals 

Recap 

Q&A 

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