User:Sgallagh/FirstTimeSetupDraft: Difference between revisions

Latest revision as of 13:22, 27 January 2016

This page is a DRAFT and is currently under development. FPC ticket 506

Services which may be enabled by Default

Only services that meet the criteria below are permitted to be enabled by default on package installation.

For the purposes of this document, a "service" is defined as one or more of:

A daemon or process started using a systemd service unit.
A daemon or process that is invoked by socket activation, either by using a systemd socket unit, D-BUS activation or similar behavior.
A systemd timer unit that runs periodically.

Locally running services

If a service does not require manual configuration to be functional and does not listen on a network socket for connections originating on a separate physical or virtual machine, it may be enabled by default (but is not required to do so).

Example: Local D-BUS services

Non-persistent services

In addition, any service which does not remain persistent on the system (aka, it "runs once then goes away"), does not listen to incoming connections during initialization, and does not require configuration to be functional may be enabled by default (but is not required to do so).

Example: iptables

Approved Exceptions

Some services which are permitted to be enabled by default as specific exceptions. Services that should be enabled by default throughout all of Fedora must be approved by FESCo. Services that should be enabled or disabled by default only on one or more of the Fedora Editions must be approved by those Editions' Working Groups.

Example:

FESCo approves openssh-server to run by default on Fedora in general.
Workstation WG approves openssh-server to be disabled by default on the Workstation Edition.

Current list of enabled/disabled services

How to enable a service by default

Unit files must correspond to the Fedora Packaging Guidelines. Services are enabled or disabled by default through systemd preset files. Preset files can be overridden by a local administrator, but a set of defaults are provided by Fedora.

If the service should be enabled by default, it must be added to one of the distribution presets files (see above).

For services which meet one of the conditions listed above, a ticket should be filed against the fedora-release package. If the preset should be changed for versions other than rawhide, indicate that in the ticket.

@@ Line 1: / Line 1: @@
-{{admon/warning|This page is a DRAFT and is currently under development}}
+{{admon/warning|This page is a DRAFT and is currently under development. [https://fedorahosted.org/fpc/ticket/506 FPC ticket 506]}}
+== Services which may be enabled by Default ==
+Only services that meet the criteria below are permitted to be enabled by default on package installation.
-== First-time Service Setup ==
+For the purposes of this document, a "service" is defined as one or more of:
-Many system services require some amount of initial setup before they can run properly for the first time. Common examples are the generation of private keys and certificates or a unique, system-specific identifier.
+* A daemon or process started using a [http://www.freedesktop.org/software/systemd/man/systemd.service.html systemd service unit].
+* A daemon or process that is invoked by socket activation, either by using a [http://www.freedesktop.org/software/systemd/man/systemd.socket.html systemd socket unit], [http://standards.freedesktop.org/desktop-entry-spec/1.1/ar01s07.html D-BUS activation] or similar behavior.
+* A [http://www.freedesktop.org/software/systemd/man/systemd.timer.html systemd timer unit] that runs periodically.
-Traditionally, this was done by RPM scriptlets as part of the installation or upgrade of a package. This was sensible for a time when the majority of installations were performed by attended or unattended installers (such as anaconda and kickstart).
+=== Locally running services ===
+If a service does not require manual configuration to be functional and does not listen on a network socket for connections originating on a separate physical or virtual machine, it may be enabled by default (but is not required to do so).
-Today we see an increased reliance on generating virtual machine images for use in both traditional and cloud-computing environments. In those cases, having system-specific data created at package installation time is problematic. It means that the production of such images need to have significant care applied to remove any system-specific information about them and then additional tools written to apply the corrected information post-deployment.
+Example: Local D-BUS services
-This guideline describes a mechanism that can be used for both traditional and cloud-based deployment styles.
+=== Non-persistent services ===
+In addition, any service which does not remain persistent on the system (aka, it "runs once then goes away"), does not listen to incoming connections during initialization, and does not require configuration to be functional may be enabled by default (but is not required to do so).
-Note: this requirement can be waived if the equivalent functionality is incorporated as part of the service's own standard startup. These guidelines are meant to address services that require setup before the service can be started.
+Example: iptables
-=== Defining System-Specific Setup ===
+=== Approved Exceptions ===
-A particular setup task is defined thusly: "Any action that must be performed on the system where the service will be run that is not common to all systems running that service."
-Some non-exhaustive examples:
+Some services which are permitted to be enabled by default as specific exceptions. Services that should be enabled by default throughout all of Fedora must be approved by [https://fedorahosted.org/fesco/newticket FESCo]. Services that should be enabled or disabled by default only on one or more of the Fedora Editions must be approved by those Editions' [https://fedoraproject.org/wiki/Fedora.next#Working_groups Working Groups].
-* The SSH daemon generates a public/private host key
-* The mod_ssl httpd module creates a self-signed certificate for the machine's hostname
-* A remote logging service creates a UUID to represent this machine
-=== Common Guidelines ===
+Example:
-For all system-specific cases, we will take advantage of systemd's [http://www.freedesktop.org/software/systemd/man/systemd.service.html#ExecStartPre= ExecStartPre] functionality.
+* FESCo approves openssh-server to run by default on Fedora in general.
+* Workstation WG approves openssh-server to be disabled by default on the Workstation Edition.
-{{admon/warning|TODO: decide if this is the right location for scripts}}
-Packagers will create a script in <code>/usr/lib/systemd/system-init/</code> named after the package that it initializes. So for sshd, the script file would be <code>/usr/lib/systemd/system-init/openssh-server</code> (note that the language of the script is up to the packager, but the file must be executable). This script must implement all of the following steps:
-# Perform a test for whether the initialization has already completed. This may be a simple test of file existence or a more complicated examination of the configuration, as needed. If the initialization has already occurred, the script must immediately return zero (success).
-# Perform whatever steps are necessary to generate the configuration. If this cannot be accomplished, the script must return with a non-zero error code. This will prevent systemd from attempting to start the actual service. If this completes successfully, it must satisfy any and all requirements for the first step to to pass. On success, it must return zero.
-The service's systemd unit file must be modified to include the following line within the <code>[Service]</code> section:
+== Current list of enabled/disabled services ==
-<pre>
+* [https://pagure.io/fedora-release/blob/master/f/90-default.preset Fedora general]
-ExecStartPre=/usr/lib/systemd/system-init/<packagename>
+* [https://pagure.io/fedora-release/blob/master/f/80-server.preset Fedora Server]
-</pre>
+* [https://pagure.io/fedora-release/blob/master/f/80-workstation.preset Fedora Workstation]
-=== Special Case: Self-signed Certificate Generation ===
+== How to enable a service by default ==
+Unit files must correspond to the Fedora Packaging [[Packaging:ScriptletSnippets#Systemd|Guidelines]]. Services are enabled or disabled by default through [http://www.freedesktop.org/software/systemd/man/systemd.preset.html systemd preset files]. Preset files can be overridden by a local administrator, but a set of defaults are provided by Fedora.
-==== OpenSSL and PEM Certificates ====
+If the service should be enabled by default, it must be added to one of the distribution presets files (see above).
-==== Mozilla NSS Certificate Database ====
+For services which meet one of the conditions listed above, a ticket should be filed against the
+[https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=fedora-release&short_desc=PRESETS:+enable+...+by+default&version=rawhide fedora-release package]. If the preset should be changed for versions other than rawhide, indicate that in the ticket.

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