203 lines
8.7 KiB
Text
203 lines
8.7 KiB
Text
|
|
=== Setting Up a Load Balancer or Proxy
|
|
|
|
This section discusses a number of things you need to configure before you can put a reverse proxy or load balancer
|
|
in front of your clustered {{book.project.name}} deployment. It also covers configuring the built in load balancer that
|
|
was <<fake/../../operating-mode/domain.adoc#_clustered-domain-example, Clustered Domain Example>>.
|
|
|
|
|
|
==== Identifying Client IP Addresses
|
|
|
|
A few features in {{book.project.name}} rely on the fact that the remote
|
|
address of the HTTP client connecting to the authentication server is the real IP address of the client machine. This can
|
|
be problematic when you have a reverse proxy or loadbalancer in front of your {{book.project.name}} authentication server.
|
|
The usual setup is that you have a frontend proxy sitting on a public network that load balances and forwards requests
|
|
to backend {{book.project.name}} server instances located in a private network. There is some extra configuration you have to do in this scenario
|
|
so that the actual client IP address is forwarded to and processed by the {{book.project.name}} server instances. Specifically:
|
|
|
|
* Configure your reverse proxy (loadbalancer) to properly set `X-Forwarded-For` and `X-Forwarded-Proto` HTTP headers.
|
|
* Configure the authentication server to read the client's IP address from `X-Forwarded-For header`.
|
|
|
|
Configuring your proxy to generate the `X-Forwarded-For` and `X-Forwarded-Proto` HTTP headers is beyond the scope of this
|
|
guide. Take extra precautions to ensure that the
|
|
`X-Forwared-For` header is set by your proxy. If your proxy isn't configured correctly, then _rogue_ clients can set this header themselves and trick {{book.project.name}}
|
|
into thinking the client is connecting from a different IP address than it actually is. This becomes really important if you are doing
|
|
any black or white listing of IP addresses.
|
|
|
|
Beyond the proxy itself, there are a few things you need to configure on the {{book.project.name}} side of things.
|
|
If your proxy is forwarding requests via the HTTP protocol, then you need to configure {{book.project.name}} to pull the client's
|
|
IP address from the `X-Forwarded-For` header rather than from the network packet.
|
|
To do this, open up the profile configuration file (_standalone.xml_, _standalone-ha.xml_, or _domain.xml_ depending on your
|
|
<<fake/../../operating-mode.adoc#_operating-mode, operating mode>>) and look for the `"urn:jboss:domain:undertow:3.0` XML block.
|
|
|
|
.`X-Forwarded-For` HTTP Config
|
|
[source,xml]
|
|
----
|
|
<subsystem xmlns="urn:jboss:domain:undertow:3.0">
|
|
<buffer-cache name="default"/>
|
|
<server name="default-server">
|
|
<ajp-listener name="ajp" socket-binding="ajp"/>
|
|
<http-listener name="default" socket-binding="http" redirect-socket="https"
|
|
proxy-address-forwarding="true"/>
|
|
...
|
|
</server>
|
|
...
|
|
</subsystem>
|
|
----
|
|
|
|
Add the `proxy-address-forwarding` attribute to the `http-listener` element. Set the value to `true`.
|
|
|
|
If your proxy is using the AJP protocol instead of HTTP to forward requests (i.e. Apache HTTPD + mod-cluster), then you have
|
|
to configure things a little differently. Instead of modifying the `http-listener`, you need to add a filter to
|
|
pull this information from the AJP packets.
|
|
|
|
|
|
.`X-Forwarded-For` AJP Config
|
|
[source,xml]
|
|
----
|
|
<subsystem xmlns="urn:jboss:domain:undertow:3.0">
|
|
<buffer-cache name="default"/>
|
|
<server name="default-server">
|
|
<ajp-listener name="ajp" socket-binding="ajp"/>
|
|
<http-listener name="default" socket-binding="http" redirect-socket="https"/>
|
|
<host name="default-host" alias="localhost">
|
|
...
|
|
<filter-ref name="proxy-peer"/>
|
|
</host>
|
|
</server>
|
|
...
|
|
<filters>
|
|
...
|
|
<filter name="proxy-peer"
|
|
class-name="io.undertow.server.handlers.ProxyPeerAddressHandler"
|
|
module="io.undertow.core" />
|
|
</filters>
|
|
</subsystem>
|
|
----
|
|
|
|
==== Enable HTTPS/SSL with a Reverse Proxy
|
|
|
|
Assuming that your reverse proxy doesn't use port 8443 for SSL you also need to configure what port HTTPS traffic is redirected to.
|
|
[source,xml]
|
|
----
|
|
<subsystem xmlns="urn:jboss:domain:undertow:3.0">
|
|
...
|
|
<http-listener name="default" socket-binding="http"
|
|
proxy-address-forwarding="true" redirect-socket="proxy-https"/>
|
|
...
|
|
</subsystem>
|
|
----
|
|
|
|
Add the `redirect-socket` attribute to the `http-listener` element. The value should be `proxy-https` which points to a
|
|
socket binding you also need to define.
|
|
|
|
Then add a new `socket-binding` element to the `socket-binding-group` element:
|
|
|
|
[source,xml]
|
|
----
|
|
|
|
<socket-binding-group name="standard-sockets" default-interface="public"
|
|
port-offset="${jboss.socket.binding.port-offset:0}">
|
|
...
|
|
<socket-binding name="proxy-https" port="443"/>
|
|
...
|
|
</socket-binding-group>
|
|
----
|
|
|
|
==== Using the Built-In Load Balancer
|
|
|
|
This section covers configuring the built in load balancer that is discussed in the
|
|
<<fake/../../operating-mode/domain.adoc#_clustered-domain-example, Clustered Domain Example>>.
|
|
|
|
The <<fake/../../operating-mode/domain.adoc#_clustered-domain-example, Clustered Domain Example>> is only designed to run
|
|
on one machine. To bring up a slave on another host, you'll need to
|
|
|
|
. Edit the _domain.xml_ file to point to your new host slave
|
|
. Copy the server distribution. You don't need the _domain.xml_, _host.xml_, or _host-master.xml_ files. Nor do you need
|
|
the _standalone/_ directory.
|
|
. Edit the _host-slave.xml_ file to change the bind addresses used or override them on the command line
|
|
|
|
|
|
|
|
===== Register a New Host With Load Balancer
|
|
|
|
Let's look first at registering the new host slave with the load balancer configuration in _domain.xml_. Open this
|
|
file and go to the undertow configuration in the `load-balancer` profile. Add a new `host` definition called
|
|
`remote-host3` within the `reverse-proxy` XML block.
|
|
|
|
.domain.xml reverse-proxy config
|
|
[source,xml]
|
|
----
|
|
<subsystem xmlns="urn:jboss:domain:undertow:3.0">
|
|
...
|
|
<handlers>
|
|
<reverse-proxy name="lb-handler">
|
|
<host name="host1" outbound-socket-binding="remote-host1" scheme="ajp" path="/" instance-id="myroute1"/>
|
|
<host name="host2" outbound-socket-binding="remote-host2" scheme="ajp" path="/" instance-id="myroute2"/>
|
|
<host name="remote-host3" outbound-socket-binding="remote-host3" scheme="ajp" path="/" instance-id="myroute3"/>
|
|
</reverse-proxy>
|
|
</handlers>
|
|
...
|
|
</subsystem>
|
|
----
|
|
|
|
The `output-socket-binding` is a logical name pointing to a `socket-binding` configured later in the _domain.xml_ file.
|
|
the `instance-id` attribute must also be unique to the new host as this value is used by a cookie to enable sticky
|
|
sessions when load balancing.
|
|
|
|
Next go down to the `load-balancer-sockets` `socket-binding-group` and add the `outbound-socket-binding` for `remote-host3`. This new
|
|
binding needs to point to the host and port of the new host.
|
|
|
|
.domain.xml outbound-socket-binding
|
|
[source,xml]
|
|
----
|
|
<socket-binding-group name="load-balancer-sockets" default-interface="public">
|
|
...
|
|
<outbound-socket-binding name="remote-host1">
|
|
<remote-destination host="localhost" port="8159"/>
|
|
</outbound-socket-binding>
|
|
<outbound-socket-binding name="remote-host2">
|
|
<remote-destination host="localhost" port="8259"/>
|
|
</outbound-socket-binding>
|
|
<outbound-socket-binding name="remote-host3">
|
|
<remote-destination host="192.168.0.5" port="8259"/>
|
|
</outbound-socket-binding>
|
|
</socket-binding-group>
|
|
----
|
|
|
|
===== Master Bind Addresses
|
|
|
|
Next thing you'll have to do is to change the `public` and `management` bind addresses for the master host. Either
|
|
edit the _domain.xml_ file as discussed in the <<fake/../../network/bind-address.adoc#_bind-address, Bind Addresses>> chapter
|
|
or specify these bind addresses on the command line as follows:
|
|
|
|
[source]
|
|
----
|
|
$ domain.sh --host-config=host-master.xml -Djboss.bind.address=192.168.0.2 -Djboss.bind.address.management=192.168.0.2
|
|
----
|
|
|
|
===== Host Slave Bind Addresses
|
|
|
|
Next you'll have to change the `public`, `management`, and domain controller bind addresses (`jboss.domain.master-address`). Either edit the
|
|
_host-slave.xml_ file or specify them on the command line as follows:
|
|
|
|
[source]
|
|
----
|
|
$ domain.sh --host-config=host-slave.xml
|
|
-Djboss.bind.address=192.168.0.5
|
|
-Djboss.bind.address.management=192.168.0.5
|
|
-Djboss.domain.master.address=192.168.0.2
|
|
----
|
|
|
|
The values of `jboss.bind.address` and `jboss.bind.addres.management` pertain to the host slave's IP address.
|
|
The value of `jboss.domain.master.address` need to be the IP address of the domain controller which is the management address
|
|
of the master host.
|
|
|
|
==== Configuring Other Load Balancers
|
|
|
|
The link:{{book.appserver.loadbalancer.link}}[the load balancer] chapter of the {{book.appserver.loadbalancer.name}}
|
|
has information on using some other software based load balancers that may help you.
|
|
|
|
|
|
|
|
|