Implement application redirects

Estimated reading time: 1 minute

The following example publishes a service and configures a redirect from old.local to new.local.

First, create an overlay network so that service traffic is isolated and secure:

$> docker network create -d overlay demo
1se1glh749q1i4pw0kf26mfx5

Next, create the service with the redirect:

$> docker service create \
    --name demo \
    --network demo \
    --detach=false \
    --label com.docker.lb.hosts=old.local,new.local \
    --label com.docker.lb.port=8080 \
    --label com.docker.lb.redirects=http://old.local,http://new.local \
    --env METADATA="demo-new" \
    ehazlett/docker-demo

Interlock detects when the service is available and publishes it. After tasks are running and the proxy service is updated, the application is available via http://new.local with a redirect configured that sends http://old.local to http://new.local:

$> curl -vs -H "Host: old.local" http://127.0.0.1
* Rebuilt URL to: http://127.0.0.1/
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 80 (#0)
> GET / HTTP/1.1
> Host: old.local
> User-Agent: curl/7.54.0
> Accept: */*
>
< HTTP/1.1 302 Moved Temporarily
< Server: nginx/1.13.6
< Date: Wed, 08 Nov 2017 19:06:27 GMT
< Content-Type: text/html
< Content-Length: 161
< Connection: keep-alive
< Location: http://new.local/
< x-request-id: c4128318413b589cafb6d9ff8b2aef17
< x-proxy-id: 48854cd435a4
< x-server-info: interlock/2.0.0-development (147ff2b1) linux/amd64
<
<html>
<head><title>302 Found</title></head>
<body bgcolor="white">
<center><h1>302 Found</h1></center>
<hr><center>nginx/1.13.6</center>
</body>
</html>
routing, proxy, redirects, interlock