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fix(blue-green): grammatical errors #560

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9f3d0b6
fix(blue-green): grammatical errors
Freytag Aug 5, 2025
638fe93
fix: add line 18 back in
Freytag Aug 5, 2025
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12 changes: 6 additions & 6 deletions deploy-apps/blue-green.html.md.erb
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Expand Up @@ -13,8 +13,8 @@ serving all production traffic.
For the example discussed here, Blue is live and Green is idle.
As you prepare a new version of your software, deployment and the final stage of
testing takes place in the environment that is not live: in this example, Green.
After deploy and fully tested the software in Green, you switch the
router so that all incoming requests now go to Green instead of Blue.
After deploying and fully testing the software in Green, you switch the router
so that all incoming requests now go to Green instead of Blue.
Green is now live, and Blue is idle.

This technique can eliminate downtime due to app deployment.
Expand All @@ -25,7 +25,7 @@ version by switching back to Blue.
You can adjust the route mapping pattern to display a static maintenance page during a maintenance window for time-consuming tasks such as migrating a database. In this scenario, the router switches all incoming requests from Blue to Maintenance to Green.

<p class="note important">
If your app uses a relational database, blue-green deployment can lead to discrepancies between your green and glue databases during an update. To maximize data integrity, configure a single database for backward and forward compatibility.</p>
If your app uses a relational database, blue-green deployment can lead to discrepancies between your green and blue databases during an update. To maximize data integrity, configure a single database for backward and forward compatibility.</p>


## <a id='blue-green-deployment'></a>Blue-green deployment with Cloud Foundry example
Expand Down Expand Up @@ -56,7 +56,7 @@ As shown in the graphic:

Now make a change to the app.
1. Replace the word "Blue" on the webpage with "Green," then rebuild the source file for the app.
1. Run `cf push` again, but use the name "Green" for the app and provide a different subdomain to create a temporary route:
2. Run `cf push` again, but use the name "Green" for the app and provide a different subdomain to create a temporary route:

<pre class="terminal">
$ cf create-route example.com --hostname demo-time-temp
Expand All @@ -68,7 +68,7 @@ After this push:

* Two instances of the app are now running on Cloud Foundry: the original Blue and the updated Green.
* The Cloud Foundry Router continues sending all traffic for `demo-time.example.com` to Blue.
The router now also sends any traffic for `demo-time-temp.example.com` to Green.
The router also sends any traffic for `demo-time-temp.example.com` to Green.

![The CF Router directs traffic to both Blue and Green sides.](../images/blue-green/blue-green.png)

Expand Down Expand Up @@ -110,7 +110,7 @@ Now all traffic for `demo-time.example.com` is sent to Green.

### <a id='remove-temp-route'></a>Step 5: Remove temporary route to Green

You can now use `cf unmap-route` to remove the route `demo-time-temp.example.com` from Green. You can delete the route using `cf delete-route` or reserved it for later use. You can also decommission Blue, or keep it in case you need to roll back your changes.
You can now use `cf unmap-route` to remove the route `demo-time-temp.example.com` from Green. You can delete the route using `cf delete-route` or reserve it for later use. You can also decommission Blue, or keep it in case you need to roll back your changes.

![After all traffic is routed to Green, the Blue side can be removed or replaced.](./images/../../images/blue-green/green.png)

Expand Down