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Maintenance mode

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Adds support for maintenance mode to Kamal.

There are two new commands:
- `kamal app maintenance` - puts the app in maintenance mode
- `kamal app live` - puts the app back in live mode

In maintenance mode, the kamal proxy will respond to requests with a
503 status code. It will use an error page built into kamal proxy.

You can use your own error page by setting `error_pages_path` in the
configuration. This will copy any 4xx.html or 5xx.html files from that
page to a volume mounted into the proxy container.
This commit is contained in:
Donal McBreen
2025-04-16 12:21:47 +01:00
parent 26b6c072f3
commit 354530f3b8
22 changed files with 319 additions and 30 deletions
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1
test/integration/docker/deployer/app_with_roles/config/deploy.yml
View File

@@ -37,6 +37,7 @@ proxy:
- X-Request-Start
asset_path: /usr/share/nginx/html/versions
error_pages_path: error_pages
registry:
server: registry:4443

8
test/integration/docker/deployer/app_with_roles/error_pages/503.html Normal file
View File

@@ -0,0 +1,8 @@
<html>
<head>
<title>503 Service Interrupted</title>
</head>
<body>
<p>Custom Maintenance Page: {{ .Message }}</p>
</body>
</html>