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141 lines
7.9 KiB
XML
141 lines
7.9 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % BOOK_ENTITIES SYSTEM "cloudstack.ent">
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%BOOK_ENTITIES;
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]>
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<!-- Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<section id="console-proxy">
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<title>Console Proxy</title>
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<para>The Console Proxy is a type of System Virtual Machine that has a role in presenting a
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console view via the web UI. It connects the user’s browser to the VNC port made available via
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the hypervisor for the console of the guest. Both the administrator and end user web UIs offer a
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console connection.</para>
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<para>Clicking a console icon brings up a new window. The AJAX code downloaded into that window
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refers to the public IP address of a console proxy VM. There is exactly one public IP address
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allocated per console proxy VM. The AJAX application connects to this IP. The console proxy then
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proxies the connection to the VNC port for the requested VM on the Host hosting the
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guest.</para>
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<note>
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<para>The hypervisors will have many ports assigned to VNC usage so that multiple VNC sessions
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can occur simultaneously.</para>
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</note>
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<para>There is never any traffic to the guest virtual IP, and there is no need to enable VNC
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within the guest.</para>
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<para>The console proxy VM will periodically report its active session count to the Management
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Server. The default reporting interval is five seconds. This can be changed through standard
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Management Server configuration with the parameter consoleproxy.loadscan.interval.</para>
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<para>Assignment of guest VM to console proxy is determined by first determining if the guest VM
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has a previous session associated with a console proxy. If it does, the Management Server will
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assign the guest VM to the target Console Proxy VM regardless of the load on the proxy VM.
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Failing that, the first available running Console Proxy VM that has the capacity to handle new
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sessions is used.</para>
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<para>Console proxies can be restarted by administrators but this will interrupt existing console
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sessions for users.</para>
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<section id="use-cert">
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<title>Using a SSL Certificate for the Console Proxy</title>
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<para>The console viewing functionality uses a dynamic DNS service under the domain name
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realhostip.com to assist in providing SSL security to console sessions. The console proxy is
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assigned a public IP address. In order to avoid browser warnings for mismatched SSL
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certificates, the URL for the new console window is set to the form of
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https://aaa-bbb-ccc-ddd.realhostip.com. You will see this URL during console session creation.
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&PRODUCT; includes the realhostip.com SSL certificate in the console proxy VM. Of course,
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&PRODUCT; cannot know about the DNS A records for our customers' public IPs prior to shipping
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the software. &PRODUCT; therefore runs a dynamic DNS server that is authoritative for the
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realhostip.com domain. It maps the aaa-bbb-ccc-ddd part of the DNS name to the IP address
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aaa.bbb.ccc.ddd on lookups. This allows the browser to correctly connect to the console
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proxy's public IP, where it then expects and receives a SSL certificate for realhostip.com,
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and SSL is set up without browser warnings.</para>
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</section>
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<section id="change-console-proxy-ssl-certificate-domain">
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<title>Changing the Console Proxy SSL Certificate and Domain</title>
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<para>If the administrator prefers, it is possible for the URL of the customer's console session
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to show a domain other than realhostip.com. The administrator can customize the displayed
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domain by selecting a different domain and uploading a new SSL certificate and private key.
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The domain must run a DNS service that is capable of resolving queries for addresses of the
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form aaa-bbb-ccc-ddd.your.domain to an IPv4 IP address in the form aaa.bbb.ccc.ddd, for
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example, 202.8.44.1. To change the console proxy domain, SSL certificate, and private
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key:</para>
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<orderedlist>
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<listitem>
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<para>Set up dynamic name resolution or populate all possible DNS names in your public IP
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range into your existing DNS server with the format aaa-bbb-ccc-ddd.company.com ->
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aaa.bbb.ccc.ddd.</para>
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</listitem>
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<listitem>
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<para>Generate the private key and certificate signing request (CSR). When you are using
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openssl to generate private/public key pairs and CSRs, for the private key that you are
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going to paste into the &PRODUCT; UI, be sure to convert it into PKCS#8 format.</para>
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<orderedlist numeration="loweralpha">
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<listitem>
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<para>Generate a new 2048-bit private key</para>
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<programlisting>openssl genrsa -des3 -out yourprivate.key 2048</programlisting>
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</listitem>
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<listitem>
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<para>Generate a new certificate CSR</para>
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<programlisting>openssl req -new -key yourprivate.key -out yourcertificate.csr</programlisting>
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</listitem>
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<listitem>
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<para>Head to the website of your favorite trusted Certificate Authority, purchase an
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SSL certificate, and submit the CSR. You should receive a valid certificate in
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return</para>
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</listitem>
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<listitem>
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<para>Convert your private key format into PKCS#8 encrypted format.</para>
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<programlisting>openssl pkcs8 -topk8 -in yourprivate.key -out yourprivate.pkcs8.encryped.key</programlisting>
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</listitem>
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<listitem>
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<para>Convert your PKCS#8 encrypted private key into the PKCS#8 format that is compliant
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with &PRODUCT;</para>
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<programlisting>openssl pkcs8 -in yourprivate.pkcs8.encrypted.key -out yourprivate.pkcs8.key</programlisting>
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</listitem>
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</orderedlist>
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</listitem>
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<listitem>
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<para>In the Update SSL Certificate screen of the &PRODUCT; UI, paste the following:</para>
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<itemizedlist>
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<listitem>
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<para>The certificate you've just generated.</para>
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</listitem>
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<listitem>
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<para>The private key you've just generated.</para>
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</listitem>
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<listitem>
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<para>The desired new domain name; for example, company.com</para>
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</listitem>
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</itemizedlist>
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<mediaobject>
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<imageobject>
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<imagedata fileref="./images/update-ssl.png"/>
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</imageobject>
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<textobject>
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<phrase>updatessl.png: Updating Console Proxy SSL Certificate</phrase>
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</textobject>
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</mediaobject>
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</listitem>
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<listitem>
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<para>The desired new domain name; for example, company.com</para>
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<para>This stops all currently running console proxy VMs, then restarts them with the new
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certificate and key. Users might notice a brief interruption in console
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availability.</para>
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</listitem>
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</orderedlist>
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<para>The Management Server generates URLs of the form "aaa-bbb-ccc-ddd.company.com" after this
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change is made. The new console requests will be served with the new DNS domain name,
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certificate, and key.</para>
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</section>
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</section>
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