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tutum-docker-clusterproxy

HAProxy image that balances between linked containers and, if launched in Tutum,
reconfigures itself when a linked cluster member joins or leaves

Usage

Launch your application container that exposes port 80:

docker run -d --name web1 tutum/hello-world
docker run -d --name web2 tutum/hello-world

Then, run tutum/haproxy linking it to the target containers:

docker run -d -p 80:80 --link web1:web1 --link web2:web2 tutum/haproxy

The tutum/haproxy container will listen in port 80 and forward requests to both web1 and web2 backends using a roundrobin algorithm.

Configuration

You can overwrite the following HAProxy configuration options:

  • PORT (default: 80): The port where the web application backends are listening to.
  • MODE (default: http): Mode of load balancing for HAProxy. Possible values include: http, tcp, health.
  • BALANCE (default: roundrobin): Load balancing algorithm to use. Possible values include: roundrobin, static-rr, source, leastconn.
  • MAXCONN (default: 4096): Sets the maximum per-process number of concurrent connections.
  • OPTION (default: redispatch): Comma-separated list of HAProxy option entries to the default section.
  • TIMEOUT (default: connect 5000,client 50000,server 50000): Comma-separated list of HAProxy timeout entries to the default section.
  • SSL_CERT (default: **None**): An optional certificate to use on the binded port. It should have both the private and public keys content. If set, port 443 will be used to handle HTTPS requests.
  • VIRTUAL_HOST (default: **None**): Optional. Let HAProxy route by domain name. Format LINK_ALIAS=DOMAIN, comma separated.

Check the HAProxy configuration manual for more information on the above.

Usage within Tutum

Launch the service you want to load-balance using Tutum.

Then, launch the load balancer. To do this, select "Jumpstarts", "Proxies" and select tutum/haproxy. During the "Environment variables" step of the wizard, link to the service created earlier (the name of the link is not important), and add "Full Access" API role (this will allow HAProxy to be updated dynamically by querying Tutum's API).

That's it - the proxy container will start querying Tutum's API for an updated list of containers in the service and reconfigure itself automatically.

Use case scenarios

My webapp container exposes port 8080, and I want the proxy to listen in port 80

Use the following:

docker run -d --link webapp:webapp -e PORT=8080 -p 80:80 tutum/haproxy

My webapp container exposes port 80, and I want the proxy to listen in port 8080

Use the following:

docker run -d --link webapp:webapp -e PORT=80 -p 8080:80 tutum/haproxy

I want the proxy to terminate SSL connections and forward plain HTTP requests to my webapp to port 80

Use the following:

docker run -d --link webapp:webapp -p 443:443 -e SSL_CERT="YOUR_CERT_TEXT" tutum/haproxy

The certificate in YOUR_CERT_TEXT is a combination of public certificate and private key. Remember to put \n between each line of the certificate. A way to do this, assuming that your certificate is stored in ~/cert.pem, is running the following:

docker run -d --link webapp:webapp -p 443:4443 -e SSL_CERT="$(awk 1 ORS='\\n' ~/cert.pem)" tutum/haproxy

I want the proxy to terminate SSL connections and forward plain HTTP requests to my webapp to port 8080

Use the following:

docker run -d --link webapp:webapp -p 443:443 -e SSL_CERT="YOUR_CERT_TEXT" -e PORT=8080 tutum/haproxy

I want to use SSL and redirect non-SSL requests to the SSL endpoint

Use the following:

docker run -d --link webapp:webapp -p 443:443 -p 80:80 -e SSL_CERT="YOUR_CERT_TEXT" tutum/haproxy

I want to set up virtual host routing by domain

There are two ways to configure virtual hosts with this image.

Method 1: configuring the proxy

Example:

docker run -d --name webapp1 tutum/hello-world
docker run -d --name webapp2 tutum/hello-world
docker run -d --link webapp1:webapp1 --link webapp2:webapp2 -e VIRTUAL_HOST="webapp1=www.webapp1.com, webapp2=www.webapp2.com" -p 80:80 tutum/haproxy

Notice that the format of VIRTUAL_HOST is LINK_ALIAS=DOMAIN, where LINK_ALIAS must match the beginning of the link name and DOMAIN is the HTTP host that you want the proxy to use to forward requests to that backend.

In the example above, when you access http://www.webapp1.com, it will show the service running in container webapp1, and http://www.webapp2.com will go to container webapp2.

If you use the following:

docker run -d --name webapp1 tutum/hello-world
docker run -d --name webapp2-1 tutum/hello-world
docker run -d --name webapp2-2 tutum/hello-world
docker run -d --link webapp1:webapp1 --link webapp2-1:webapp2-1 --link webapp2-2:webapp2-2 -e VIRTUAL_HOST="webapp1=www.webapp1.com, webapp2=www.webapp2.com" -p 80:80 tutum/haproxy

When you access http://www.webapp1.com, it will show the service running in container webapp1, and http://www.webapp2.com will go to both containers webapp2-1 and webapp2-2 using round robin (or whatever is configured in BALANCE).

Method 2: configuring the webapp backends

Alternatively, virtual hosts can be configured by the proxy reading linked container environment variables (VIRTUAL_HOST). Here is an example:

docker run -d -e VIRTUAL_HOST=www.webapp1.com --name webapp1 tutum/hello-world
docker run -d -e VIRTUAL_HOST=www.webapp2.com --name webapp2 tutum/hello-world 
docker run -d --link webapp1:webapp1 --link webapp2:webapp2 -p 80:80 tutum/haproxy

In the example above, when you access http://www.webapp1.com, it will show the service running in container webapp1, and http://www.webapp2.com will go to container webapp2.

If you use the following:

docker run -d -e VIRTUAL_HOST=www.webapp1.com --name webapp1 tutum/hello-world
docker run -d -e VIRTUAL_HOST=www.webapp2.com --name webapp2-1 tutum/hello-world
docker run -d -e VIRTUAL_HOST=www.webapp2.com --name webapp2-2 tutum/hello-world
docker run -d --link webapp1:webapp1 --link webapp2-1:webapp2-1 --link webapp2-2:webapp2-2 -p 80:80 tutum/haproxy

When you access http://www.webapp1.com, it will show the service running in container webapp1, and http://www.webapp2.com will go to both containers webapp2-1 and webapp2-2 using round robin (or whatever is configured in BALANCE).

Topologies using virtual hosts

Within Tutum:

                                                     |---- container 1
                              |----- service 1 ----- |---- container 2
                              |   (virtual host 1)   |---- container 3
internet --- tutum/haproxy--- |
                              |                      |---- container a
                              |----- service 2 ----- |---- container b
                                  (virtual host 2)   |---- container c

Outside Tutum (any Docker server):

                              |---- container 1 (virtual host 1)
                              |---- container 2 (virtual host 1)
                              |---- container 3 (virtual host 1)
internet --- tutum/haproxy--- |
                              |---- container a (virtual host 2)
                              |---- container b (virtual host 2)
                              |---- container c (virtual host 2)
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