Setting up a web farm for Blue-Green deployRSS

• • Reply
  CyberFranck

  2 Posts

  Setting up a web farm for Blue-Green deploy

  Jan 11, 2021 08:57 PM|CyberFranck|LINK

  It seems extremely complicated to make URL Rewrite to work so i am trying asking here in hope to find better tutorial or explaination for my custom case scenario. First I have a windows server 2016 brand new with IIS 10.0. I do believe URL Rewrite is broken on that system and i have already retried a couple time reloading the original snapshot of what HyperVM and each time i install and try a basic rewrite rule it fails.

  A basic test is to do a simple redirect. I created a host redirect like this.

  127.0.0.1 test.useless.com

  Then i tried a custom config in the IIS root to redirect that to google.

  <rule name="something" stopProcessing="false">
      <match url="(.*)" />
      <conditions>
          <add input="{HTTP_HOST}" pattern="*/test.useless.com/*" />
      </conditions>
      <action type="Redirect" url="http://www.google.ca/" redirectType="Permanent" />
  </rule>

  This should redirect simply to google.ca. Tested the pattern and it works but the redirect rule does not work at all and i cannot find any logging in the IIS logs.

  So knowing this simple rewrite rule does not work it explain why more complex Blue-Green deploy farm fails to work if i cannot even get such simple redirect to work.

  What is the final goal :

  The final goal is i have 4 DNS name given by my IT and i need to have a Blue-Green for each. The trick is one of them is the main domain and the other a sub domains.

  So i have the DNS names with ports i will use right now :

  Site1.MySite.com Port Blue 8820, Green 8821

  Site2.MySite.com Port Blue 8830, Green 8831

  Site3.MySite.com Port Blue 8840, Green 8841

  MySite.com Port Blue 8810, Green 8811

  I created 8 website (2 per site 1 blue 1 green) in IIS root which all are bind to all ip but have a specified port

  So website called "Site1.MySite.com.blue" bind all ip port 8820 and so on for each site

  To make things work i created host file entry for the farm computers so they redirect inside so i added for example :

  127.0.0.1 Site1.MySite.com.blue

  127.0.0.1 Site1.MySite.com.green

  and did so for all the other sites i have as well. Then I created 4 farms

  Site1, Site2, Site3, MainSite

  Each one i added 2 server using the same name as the host file and same in the hostname and put the correct port for each of them. Then i enabled the url rewrite and click apply which should make the correct rule by default (which it is not obviously, i couldn't be that easy).

  Now what do i have to do to make it work properly ? I cannot browse the Site1.MySite.com it just show a "page cannot display". how to i get the rules to do the following :

  Site1.MySite.com -> go to Site1 farm -> reroute to -> Site1.MySite.com.blue:8820 or Site1.MySite.com.green:8821

  Site2.MySite.com -> go to Site2 farm -> reroute to -> Site2.MySite.com.blue:8830 or Site2.MySite.com.green:8831

  Site3.MySite.com -> go to Site3 farm -> reroute to -> Site3.MySite.com.blue:8840 or Site3.MySite.com.green:8841

  MySite.com -> go to MainSite farm -> reroute to -> MySite.com.blue:8810 or MySite.com.green:8811

• • Reply
  lextm

  8931 Posts

  MVP

  Re: Setting up a web farm for Blue-Green deploy

  Jan 11, 2021 11:31 PM|lextm|LINK

  CyberFranck

  This should redirect simply to google.ca. Tested the pattern and it works but the redirect rule does not work at all and i cannot find any logging in the IIS logs.

  No, it shouldn't, as you served wrong input for the condition. Mistake 1 in https://blog.lextudio.com/the-very-common-mistakes-when-using-iis-url-rewrite-module-a2ab7e4fee59 

  Lex Li
  Affordable IIS Consulting Services at https://support.lextudio.com/services/consulting.html
  ---------------------------
  This posting is provided "AS IS" with no warranties, and confers no rights.
• • Reply
  samwu

  90 Posts

  Re: Setting up a web farm for Blue-Green deploy

  Jan 12, 2021 06:10 AM|samwu|LINK

  Hi CyberFranck,

  CyberFranck

  Then i tried a custom config in the IIS root to redirect that to google.

  CyberFranck

  <add input="{HTTP_HOST}" pattern="*/test.useless.com/*" />

  The reason why your rule does not work is because your parameter is wrong,  you can try this parameter: ^test.useless.com$.

  <add input="{HTTP_HOST}" pattern="^test.useless.com$" />

  For how to troubleshoot url rewrite you can refer to this link: using-failed-request-tracing.

  CyberFranck

  I cannot browse the Site1.MySite.com it just show a "page cannot display"

  Can you post more information about this error?  and Do you want to redirect Site1.MySite.com to Site1.MySite.com.blue:8820 or Site1.MySite.com.green:8821?

  Best regards,

  Sam

  .NET forums are moving to a new home on Microsoft Q&A, we encourage you to go to Microsoft Q&A for .NET for posting new questions and get involved today.
  
• • Reply
  CyberFranck

  2 Posts

  Re: Setting up a web farm for Blue-Green deploy

  Jan 12, 2021 01:08 PM|CyberFranck|LINK

  changed the pattern and i doesn't work either.

  For the error it's just a basic "page not found" it's generated by the browser.

  Site1.MySite.com need to redirect to the farm which should redirect automagically to Site1.MySite.com.blue:8820 or Site1.MySite.com.green:8821 depending on the round robin balancer.

• • Reply
  samwu

  90 Posts

  Re: Setting up a web farm for Blue-Green deploy

  Jan 13, 2021 08:27 AM|samwu|LINK

  Hi CyberFranck,

  CyberFranck

  changed the pattern and i doesn't work either.

  It works fine on my side, this is my rule:

  <rule name="test4" enabled="false" stopProcessing="true">
      <match url="^(.*)$" />
         <conditions>
             <add input="{HTTP_HOST}" pattern="^test.useless.com$" />
         </conditions>
      <action type="Redirect" url="http://www.google.ca/" />
  </rule>

  

  CyberFranck

  Site1.MySite.com need to redirect to the farm which should redirect automagically to Site1.MySite.com.blue:8820

  <rule name="test5" enabled="true" stopProcessing="true">
     <match url="^(.*)$" />
         <conditions>
           <add input="{HTTP_HOST}" pattern="^Site1.MySite.com$" />
         </conditions>
     <action type="Redirect" url="http://Site1.MySite.com.blue:8820" />
  </rule>

  

  Best regards,

  Sam

  .NET forums are moving to a new home on Microsoft Q&A, we encourage you to go to Microsoft Q&A for .NET for posting new questions and get involved today.