two graphics (flowchart and sequence diagram) with SVG versions.
regenerate pdf output.
--- /dev/null
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+ <tspan
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+++ /dev/null
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
-"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
-<article>
- <articleinfo>
- <title>Booting PlanetLab Nodes</title>
-
- <author>
- <firstname>Aaron</firstname>
-
- <surname>Klingaman</surname>
-
- <email>alk@absarokasoft.com</email>
- </author>
-
- <affiliation>
- <orgname>Princeton University</orgname>
- </affiliation>
-
- <revhistory>
- <revision>
- <revnumber>1.0</revnumber>
-
- <date>March 16, 2006</date>
-
- <authorinitials>AK</authorinitials>
-
- <revdescription>
- <para>Initial draft of new PDN, based on existing BootManager and
- BootCD Technical documentation</para>
- </revdescription>
- </revision>
- </revhistory>
- </articleinfo>
-
- <section>
- <title>Overview</title>
-
- <para>This document describes a reference implementation for securely
- booting PlanetLab nodes, that has been collectively named the
- BootManager.</para>
- </section>
-
- <section>
- <title>Components</title>
-
- <para>The entire Boot Manager system consists of several components that
- are designed to work together to provide the ability to install, validate,
- and boot a PlanetLab node. These components are:</para>
-
- <itemizedlist>
- <listitem>
- <para>The existing, stardard MA provided calls to allow principals to
- add and manage node records</para>
- </listitem>
-
- <listitem>
- <para>New principal used API calls to create and download
- node-specific configuration files</para>
- </listitem>
-
- <listitem>
- <para>A new set of API calls and a new authentication mechanism to be
- used by the nodes</para>
- </listitem>
-
- <listitem>
- <para>A code package to be run in the boot cd environment on nodes
- containing core install/validate/boot logic</para>
- </listitem>
- </itemizedlist>
- </section>
-
- <section>
- <title>Soure Code</title>
-
- <para>All BootManager source code is located in the repository
- 'bootmanager' on the PlanetLab CVS system. For information on how to
- access CVS, consult the PlanetLab website. Unless otherwise noted, all
- file references refer to this repository.</para>
- </section>
-
- <section>
- <title>Stardard MA Interfaces</title>
-
- <para>The API calls provided by the Management Authority are called out
- here for their relevency, and to document any extentions to them. See the
- PlanetLab Core Specification for more details.</para>
-
- <para><itemizedlist>
- <listitem>
- <para>AddNode( authentication, node_values )</para>
-
- <para>Add a new node record</para>
- </listitem>
-
- <listitem>
- <para>UpdateNode( authentication, update_values )</para>
-
- <para>Update an existing node record</para>
- </listitem>
-
- <listitem>
- <para>DeleteNode( authentication, node_id )</para>
-
- <para>Removes a node from the MA list of nodes</para>
- </listitem>
- </itemizedlist></para>
-
- <para>Additional node-specific values have been added to the AddNode and
- UpdateNode calls:</para>
-
- <itemizedlist>
- <listitem>
- <para>boot_state</para>
-
- <para>Store what state the node is currently in.</para>
- </listitem>
- </itemizedlist>
-
- <section>
- <title>Boot States</title>
-
- <para>Each node always has one of four possible boot states.</para>
-
- <orderedlist>
- <listitem>
- <para>'inst'</para>
-
- <para>Install. The boot state cooresponds to a new node that has not
- yet been installed, but record of it does exist. When the boot
- manager starts, and the node is in this state, the user is prompted
- to continue with the installation. The intention here is to prevent
- a non-PlanetLab machine (like a user's desktop machine) from
- becoming inadvertantly wiped and installed with the PlanetLab node
- software.</para>
- </listitem>
-
- <listitem>
- <para>'rins'</para>
-
- <para>Reinstall. In this state, a node will reinstall the node
- software, erasing anything that might have been on the disk
- before.</para>
- </listitem>
-
- <listitem>
- <para>'boot'</para>
-
- <para>Boot. This state cooresponds with nodes that have sucessfully
- installed, and can be chain booted to the runtime node
- kernel.</para>
- </listitem>
-
- <listitem>
- <para>'dbg'</para>
-
- <para>Debug. Regardless of whether or not a machine has been
- installed, this state sets up a node to be debugged by
- administrators.</para>
- </listitem>
- </orderedlist>
- </section>
- </section>
-
- <section>
- <title>Additional Principal Based MA Interfaces</title>
-
- <para>The following API calls have been added to the MA:</para>
-
- <para><itemizedlist>
- <listitem>
- <para>GenerateNodeConfigurationFile( authentication, node_id
- )</para>
-
- <para>Return a configuration file containing node details, including
- network settings, the node_id, and a key to be used for
- authenticated node calls.</para>
- </listitem>
- </itemizedlist></para>
- </section>
-
- <section>
- <title>Additional Node Based Interfaces and Authentication</title>
-
- <section>
- <title>Authentication</title>
-
- <para>The API calls described below will be run by the nodes themselves,
- so a new authentication mechanism is required. As is done with other PLC
- API calls, the first parameter to all BootManager related calls will be
- an authentication structure, consisting of these named fields:</para>
-
- <itemizedlist>
- <listitem>
- <para>AuthMethod</para>
-
- <para>The authentication method, only 'hmac' is currently
- supported</para>
- </listitem>
-
- <listitem>
- <para>node_id</para>
-
- <para>The node id, contained on the configuration file.</para>
- </listitem>
-
- <listitem>
- <para>node_ip</para>
-
- <para>The node's primary IP address. This will be checked with the
- node_id against PLC records.</para>
- </listitem>
-
- <listitem>
- <para>value</para>
-
- <para>The authentication string, depending on method. For the 'hmac'
- method, a hash for the call using the HMAC algorithm, made from the
- parameters of the call the key contained on the configuration file.
- For specifics on how this is created, see below.</para>
- </listitem>
- </itemizedlist>
-
- <para>Authentication is succesful if PLC is able to create the same hash
- from the values usings its own copy of the node key. If the hash values
- to not match, then either the keys do not match or the values of the
- call were modified in transmision and the node cannot be
- authenticated.</para>
-
- <para>Both the BootManager and the authentication software at PLC must
- agree on a method for creating the hash values for each call. This hash
- is essentially a finger print of the method call, and is created by this
- algorithm:</para>
-
- <orderedlist>
- <listitem>
- <para>Take the value of every part of each parameter, except the
- authentication structure, and convert them to strings. For arrays,
- each element is used. For dictionaries, not only is the value of all
- the items used, but the keys themselves. Embedded types (arrays or
- dictionaries inside arrays or dictionaries, etc), also have all
- values extracted.</para>
- </listitem>
-
- <listitem>
- <para>Alphabetically sort all the parameters.</para>
- </listitem>
-
- <listitem>
- <para>Concatenate them into a single string.</para>
- </listitem>
-
- <listitem>
- <para>Prepend the string with the method name and [, and append
- ].</para>
- </listitem>
- </orderedlist>
-
- <para>The implementation of this algorithm is in the function
- serialize_params in the file source/BootAPI.py. The same algorithm is
- located in the 'plc_api' repository, in the function serialize_params in
- the file PLC/Auth.py.</para>
-
- <para>The resultant string is fed into the HMAC algorithm with the node
- key, and the resultant hash value is used in the authentication
- structure.</para>
-
- <para>This authentication method makes a number of assumptions, detailed
- below.</para>
-
- <orderedlist>
- <listitem>
- <para>All calls made to PLC are done over SSL, so the details of the
- authentication structure cannot be viewed by 3rd parties. If, in the
- future, non-SSL based calls are desired, a sequence number or some
- other value making each call unique will would be required to
- prevent replay attacks. In fact, the current use of SSL negates the
- need to create and send hashes across - technically, the key itself
- could be sent directly to PLC, assuming the connection is made to an
- HTTPS server with a third party signed SSL certificate.</para>
- </listitem>
-
- <listitem>
- <para>Athough calls are done over SSL, they use the Python class
- libary xmlrpclib, which does not do SSL certificate
- verification.</para>
- </listitem>
- </orderedlist>
- </section>
-
- <section>
- <title>Additional API Calls</title>
-
- <para>The following calls have been added:</para>
-
- <itemizedlist>
- <listitem>
- <para>BootUpdateNode( authentication, update_values )</para>
-
- <para>Update a node record, including its boot state, primary
- network, or ssh host key.</para>
- </listitem>
-
- <listitem>
- <para>BootCheckAuthentication( authentication )</para>
-
- <para>Simply check to see if the node is recognized by the system
- and is authorized.</para>
- </listitem>
-
- <listitem>
- <para>BootGetNodeDetails( authentication )</para>
-
- <para>Return details about a node, including its state, what
- networks the PLC database has configured for the node, and what the
- model of the node is.</para>
- </listitem>
-
- <listitem>
- <para>BootNotifyOwners( authentication, message, include_pi,
- include_tech, include_support )</para>
-
- <para>Notify someone about an event that happened on the machine,
- and optionally include the site PIs, technical contacts, and
- PlanetLab Support.</para>
- </listitem>
- </itemizedlist>
- </section>
- </section>
-
- <section>
- <title>Core Package</title>
-
- <para>The Boot Manager core package, which is run on the nodes and
- contacts the Boot API as necessary, is responsible for the following major
- functional units:</para>
-
- <itemizedlist>
- <listitem>
- <para>Configuring node hardware and installing the PlanetLab operating
- system</para>
- </listitem>
-
- <listitem>
- <para>Putting a node into a debug state so administrators can track
- down problems</para>
- </listitem>
-
- <listitem>
- <para>Reconfiguring an already installed node to reflect new hardware,
- or changed network settings</para>
- </listitem>
-
- <listitem>
- <para>Booting an already installed node into the PlanetLab operating
- system</para>
- </listitem>
- </itemizedlist>
-
- <section>
- <title>Flow Chart</title>
-
- <para>Below is a high level flow chart of the boot manager, from the
- time it is executed to when it exits. This core state machine is located
- in source/BootManager.py.</para>
-
- <para><figure>
- <title>Boot Manager Flow Chart</title>
-
- <mediaobject>
- <imageobject>
- <imagedata align="left" fileref="boot-manager-flowchart.png"
- scalefit="1" />
- </imageobject>
- </mediaobject>
- </figure></para>
-
- <para></para>
- </section>
-
- <section>
- <title>Example Session Sequence</title>
-
- <para><figure>
- <title>Boot Manager Session Sequence Diagram</title>
-
- <mediaobject>
- <imageobject>
- <imagedata align="left" fileref="bootmanager-sequence.png"
- scalefit="1" />
- </imageobject>
- </mediaobject>
- </figure></para>
- </section>
-
- <section>
- <title>Boot CD Environment</title>
-
- <para>The boot manager needs to be able to operate under all currently
- supported boot cds. The new 3.0 cd contains software the current 2.x cds
- do not contain, including the Logical Volume Manager (LVM) client tools,
- RPM, and YUM, among other packages. Given this requirement, the boot cd
- will need to download as necessary the extra support files it needs to
- run. Depending on the size of these files, they may only be downloaded
- by specific steps in the flow chart in figure 1, and thus are not
- mentioned.</para>
-
- <para>See the PlanetLab BootCD Documentation for more information about
- the current, 3.x boot cds, how they are build, and what they provide to
- the BootManager.</para>
- </section>
-
- <section>
- <title>Node Configuration Files</title>
-
- <para>To remain compatible with 2.x boot cds, the format and existing
- contents of the configuration files for the nodes will not change. There
- will be, however, the addition of three fields:</para>
-
- <orderedlist>
- <listitem>
- <para>NET_DEVICE</para>
-
- <para>If present, use the device with the specified mac address to
- contact PLC. The network on this device will be setup. If not
- present, the device represented by 'eth0' will be used.</para>
- </listitem>
-
- <listitem>
- <para>NODE_KEY</para>
-
- <para>The unique, per-node key to be used during authentication and
- identity verification. This is a fixed length, random value that is
- only known to the node and PLC.</para>
- </listitem>
-
- <listitem>
- <para>NODE_ID</para>
-
- <para>The PLC assigned node identifier.</para>
- </listitem>
- </orderedlist>
-
- <para>An example of a configuration file for a dhcp networked
- machine:</para>
-
- <programlisting>IP_METHOD="dhcp"
-HOST_NAME="planetlab-1"
-DOMAIN_NAME="cs.princeton.edu"
-NET_DEVICE="00:06:5B:EC:33:BB"
-NODE_KEY="79efbe871722771675de604a227db8386bc6ef482a4b74"
-NODE_ID="121"</programlisting>
-
- <para>An example of a configuration file for the same machine, only with
- a statically assigned network address:</para>
-
- <programlisting>IP_METHOD="static"
-IP_ADDRESS="128.112.139.71"
-IP_GATEWAY="128.112.139.65"
-IP_NETMASK="255.255.255.192"
-IP_NETADDR="128.112.139.127"
-IP_BROADCASTADDR="128.112.139.127"
-IP_DNS1="128.112.136.10"
-IP_DNS2="128.112.136.12"
-HOST_NAME="planetlab-1"
-DOMAIN_NAME="cs.princeton.edu"
-NET_DEVICE="00:06:5B:EC:33:BB"
-NODE_KEY="79efbe871722771675de604a227db8386bc6ef482a4b74"
-NODE_ID="121"</programlisting>
- </section>
- </section>
-
- <section>
- <title>BootManager Configuration</title>
-
- <para>All run time configuration options for the BootManager exist in a
- single file located at source/configuration. These values are described
- below.</para>
-
- <itemizedlist>
- <listitem>
- <para><literal>VERSION</literal></para>
-
- <para>The current BootManager version. During install, written out to
- /etc/planetlab/install_version</para>
- </listitem>
-
- <listitem>
- <para><literal>BOOT_API_SERVER</literal></para>
-
- <para>The full URL of the API server to contact for authenticated
- operations.</para>
- </listitem>
-
- <listitem>
- <para><literal>TEMP_PATH</literal></para>
-
- <para>A writable path on the boot cd we can use for temporary storage
- of files.</para>
- </listitem>
-
- <listitem>
- <para><literal>SYSIMG_PATH</literal></para>
-
- <para>The path were we will mount the node logical volumes during any
- step that requires access to the disks.</para>
- </listitem>
-
- <listitem>
- <para>CACERT_PATH</para>
-
- <para>Variable not used anymore.</para>
- </listitem>
-
- <listitem>
- <para><literal>NONCE_FILE</literal></para>
-
- <para>Variable not used anymore.</para>
- </listitem>
-
- <listitem>
- <para><literal>PLCONF_DIR</literal></para>
-
- <para>The path that PlanetLab node configuration files will be created
- in during install. This should not be changed from /etc/planetlab, as
- this path is assumed in other PlanetLab components.</para>
- </listitem>
-
- <listitem>
- <para><literal>SUPPORT_FILE_DIR</literal></para>
-
- <para>A path on the boot server where per-step additional files may be
- located. For example, the packages that include the tools to allow
- older 2.x version boot cds to partition disks with LVM.</para>
- </listitem>
-
- <listitem>
- <para><literal>ROOT_SIZE</literal></para>
-
- <para>During install, this sets the size of the node root partition.
- It must be large enough to house all the node operational software. It
- does not store any user/slice files. Include 'G' suffix in this value,
- indicating gigabytes.</para>
- </listitem>
-
- <listitem>
- <para><literal>SWAP_SIZE</literal></para>
-
- <para>How much swap to configure the node with during install. Include
- 'G' suffix in this value, indicating gigabytes.</para>
- </listitem>
-
- <listitem>
- <para><literal>SKIP_HARDWARE_REQUIREMENT_CHECK</literal></para>
-
- <para>Whether or not to skip any of the hardware requirement checks,
- including total disk and memory size constraints.</para>
- </listitem>
-
- <listitem>
- <para><literal>MINIMUM_MEMORY</literal></para>
-
- <para>How much memory is required by a running PlanetLab node. If a
- machine contains less physical memory than this value, the install
- will not proceed.</para>
- </listitem>
-
- <listitem>
- <para><literal>MINIMUM_DISK_SIZE</literal></para>
-
- <para>The size of the small disk we are willing to attempt to use
- during the install, in gigabytes. Do not include any suffixes.</para>
- </listitem>
-
- <listitem>
- <para><literal>TOTAL_MINIMUM_DISK_SIZE</literal></para>
-
- <para>The size of all usable disks must be at least this sizse, in
- gigabytes. Do not include any suffixes.</para>
- </listitem>
-
- <listitem>
- <para><literal>INSTALL_LANGS</literal></para>
-
- <para>Which language support to install. This value is used by RPM,
- and is used in writting /etc/rpm/macros before any RPMs are
- installed.</para>
- </listitem>
-
- <listitem>
- <para><literal>NUM_AUTH_FAILURES_BEFORE_DEBUG</literal></para>
-
- <para>How many authentication failures the BootManager is willing to
- except for any set of calls, before stopping and putting the node into
- a debug mode.</para>
- </listitem>
- </itemizedlist>
- </section>
-
- <section>
- <title>Installer Hardware Detection</title>
-
- <para>When a node is being installed, the Boot Manager must identify which
- hardware the machine has that is applicable to a running node, and
- configure the node properly so it can boot properly post-install. The
- general procedure for doing so is outline in this section. It is
- implemented in the <filename>source/systeminfo.py</filename> file.</para>
-
- <para>The process for identifying which kernel module needs to be load
- is:</para>
-
- <orderedlist>
- <listitem>
- <para>Create a lookup table of all modules, and which PCI ids
- coorespond to this module.</para>
- </listitem>
-
- <listitem>
- <para>For each PCI device on the system, lookup its module in the
- first table.</para>
- </listitem>
-
- <listitem>
- <para>If a module is found, put in into one of two categories of
- modules, either network module or scsi module, based on the PCI device
- class.</para>
- </listitem>
-
- <listitem>
- <para>For each network module, write out an 'eth<index>' entry
- in the modprobe.conf configuration file.</para>
- </listitem>
-
- <listitem>
- <para>For each scsi module, write out a
- 'scsi_hostadapter<index>' entry in the modprobe.conf
- configuration file.</para>
- </listitem>
- </orderedlist>
-
- <para>This process is fairly straight forward, and is simplified by the
- fact that we currently do not need support for USB, sound, or video
- devices when the node is fully running. The boot cd itself uses a similar
- process, but includes USB devices. Consult the boot cd technical
- documentation for more information.</para>
-
- <para>The creation of the PCI id to kernel module table lookup uses three
- different sources of information, and merges them together into a single
- table for easier lookups. With these three sources of information, a
- fairly comprehensive lookup table can be generated for the devices that
- PlanetLab nodes need to have configured. They include:</para>
-
- <orderedlist>
- <listitem>
- <para>The installed <filename>/usr/share/hwdata/pcitable
- </filename>file</para>
-
- <para>Created at the time the hwdata rpm was built, this file contains
- mappings of PCI ids to devices for a large number of devices. It is
- not necessarily complete, and doesn't take into account the modules
- that are actually available by the built PlanetLab kernel, which is a
- subset of the full set available (again, PlanetLab nodes do not have a
- use for network or video drivers, and thus are not typically
- built).</para>
- </listitem>
-
- <listitem>
- <para>From the built kernel, the <filename>modules.pcimap</filename>
- from the <filename>/lib/modules/<kernelversion>/</filename>
- directory.</para>
-
- <para>This file is generated at the time the kernel is installed, and
- pulls the PCI ids out of each module, for the modules list they
- devices they support. Not all modules list all devices they sort, and
- some contain wild cards (that match any device of a single
- manufacturer).</para>
- </listitem>
-
- <listitem>
- <para>From the built kernel, the <filename>modules.dep</filename> from
- the <filename>/lib/modules/<kernelversion>/</filename>
- directory.</para>
-
- <para>This file is also generated at the time the kernel is installed,
- but lists the dependencies between various modules. It is used to
- generate a list of modules that are actually available.</para>
- </listitem>
- </orderedlist>
-
- <para>It should be noted here that SATA (Serial ATA) devices have been
- known to exist with both a PCI SCSI device class, and with a PCI IDE
- device class. Under linux 2.6 kernels, all SATA modules need to be listed
- in modprobe.conf under 'scsi_hostadapter' lines. This case is handled in
- the hardware loading scripts by making the assumption that if an IDE
- device matches a loadable module, it should be put in the modprobe.conf
- file, as 'real' IDE drivers are all currently built into the kernel, and
- do not need to be loaded. SATA devices that have a PCI SCSI device class
- are easily identified.</para>
-
- <para>It is enssential that the modprobe.conf configuration file contain
- the correct drivers for the disks on the system, if they are present, as
- during kernel installation the creation of the initrd (initial ramdisk)
- which is responsible for booting the system uses this file to identify
- which drivers to include in it. A failure to do this typically results in
- an kernel panic at boot with a 'no init found' message.</para>
- </section>
-
- <section>
- <title>Common Scenarios</title>
-
- <para>Below are common scenarios that the BootManager might encounter that
- would exist outside of the documented procedures for handling nodes. A
- full description of how they will be handled by the BootManager follows
- each.</para>
-
- <itemizedlist>
- <listitem>
- <para>A configuration file from previously installed and functioning
- node is copied or moved to another machine, and the networks settings
- are updated on it (but the key and node_id is left the same).</para>
-
- <para>Since the authentication for a node consists of matching not
- only the node id, but the primary node ip, this step will fail, and
- the node will not allow the boot manager to be run. Instead, the new
- node must be created at PLC first, and a network configuration file
- for it must be generated, with its own node key.</para>
- </listitem>
-
- <listitem>
- <para>After a node is installed and running, the administrators
- mistakenly remove the cd and media containing the configuration
- file.</para>
-
- <para>The node installer clears all boot records from the disk, so the
- node will not boot. Typically, the bios will report no operating
- system.</para>
- </listitem>
-
- <listitem>
- <para>A new network configuration file is generated on the website,
- but is not put on the node.</para>
-
- <para>Creating a new network configuration file through the PLC
- interfaces will generate a new node key, effectively invalidating the
- old configuration file (still in use by the machine). The next time
- the node reboots and attempts to authentication with PLC, it will
- fail. After two consecutive authentication failures, the node will
- automatically put itself into debug mode. In this case, regardless of
- the API function being called that was unable to authentication, the
- software at PLC will automatically notify the PlanetLab
- administrators, and the contacts at the site of the node was able to
- be identified (usually through its IP address or node_id by searching
- PLC records.).</para>
- </listitem>
- </itemizedlist>
- </section>
-</article>
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