Section 7: overview, conventions, and miscellany
dracut.modules – dracut modules Description dracut uses a modular system to build and extend the initramfs image. All modules are located in /usr/lib/dracut/modules.d or in <git-src>/modules.d. The most basic dracut module is 99base. In 99base the initial shell script init is defined, which gets run by the kernel after initramfs loading. Although you can replace…
dracut.cmdline – dracut kernel command line options Description The root device used by the kernel is specified in the boot configuration file on the kernel command line, as always. The traditional root=/dev/sda1 style device specification is allowed, but not encouraged. The root device should better be identified by LABEL or UUID. If a label is…
dracut.bootup – boot ordering in the initramfs Description This flow chart illustrates the ordering of the services, if systemd is used in the dracut initramfs. systemd-journal.socket | v dracut-cmdline.service | v dracut-pre-udev.service | v systemd-udevd.service | v local-fs-pre.target dracut-pre-trigger.service | | v v (various mounts) (various swap systemd-udev-trigger.service | devices…) | (various low-level (various low-level…
doveadm-search-query – Overview of search queries for doveadm mailbox commands Description Several doveadm(1) commands use a search_query in order to act only on matching messages. This manual page describes all SEARCH KEYS, which can be used in a search_query. Each search_query consists at least of one SEARCH KEY. Most of the SEARCH KEYS require an…
ditroff – classical device-independent roff Description The name ditroff refers to a historical development stage of the roff(7) text processing system. In roff systems extant today, the name troff is a synonym for ditroff. Early versions of roff by Joe Ossanna generated two programs from the same sources, using conditional compilation to distinguish them. nroff…
dh-autoreconf – debhelper add-on to run autoreconf during build Description The dh-autoreconf package provides a sequence addon for debhelper 7 and is enabled by default since compatibility level 10. For earlier compatibility levels it can be enabled in the following way: #!/usr/bin/make -f %: dh $@ –with autoreconf This will call dh_autoreconf prior to dh_auto_configure…
Syntax of syntax highlighting files used by dex. Description Syntax file consists of states. A state consists of optional conditionals and one default action. The best way understand the syntax is to read /usr/share/dex/syntax/dex (a simple example) or /usr/share/dex/syntax/c (a more complete example using sub-syntaxes). Basic syntax of the syntax files is the same used…
debuginfod-client-config – debuginfod client environment variables, cache control files and etc. Synopsis Several environment variables and control files control the behaviour of debuginfod client applications. Environment Variables $TMPDIR This environment variable points to a file system to be used for temporary files. The default is /tmp. $DEBUGINFOD_URLS This environment variable contains a list of URL…
debhelper – the debhelper tool suite Synopsis dh_* [-v] [-a] [-i] [–no-act] [-ppackage] [-Npackage] [-Ptmpdir] Description Debhelper is used to help you build a Debian package. The philosophy behind debhelper is to provide a collection of small, simple, and easily understood tools that are used in debian/rules to automate various common aspects of building a…
debhelper-obsolete-compat – List of no longer supported compat levels Synopsis This document contains the upgrade guidelines from all compat levels which are no longer supported. Accordingly it is mostly for historical purposes and to assist people upgrading from a non-supported compat level to a supported level. For upgrades from supported compat levels, please see debhelper(7)….
debconf – Debian package configuration system Description Debconf is a configuration system for Debian packages. There is a rarely-used command named debconf, documented in debconf(1) Debconf provides a consistent interface for configuring packages, allowing you to choose from several user interface frontends. It supports preconfiguring packages before they are installed, which allows large installs and…
debconf – developers guide Description This is a guide for developing packages that use debconf. This manual assumes that you are familiar with debconf as a user, and are familiar with the basics of debian package construction. This manual begins by explaining two new files that are added to debian packages that use debconf. Then…
deb-version – Debian package version number format Synopsis [epoch:]upstream-version[–debian-revision] Description Version numbers as used for Debian binary and source packages consist of three components. These are: epoch This is a single (generally small) unsigned integer. It may be omitted, in which case zero is assumed. If it is omitted then the upstream-version may not contain…
ddp – Linux AppleTalk protocol implementation Synopsis #include <sys/socket.h> #include <netatalk/at.h> ddp_socket = socket(AF_APPLETALK, SOCK_DGRAM, 0); raw_socket = socket(AF_APPLETALK, SOCK_RAW, protocol); Description Linux implements the AppleTalk protocols described in Inside AppleTalk. Only the DDP layer and AARP are present in the kernel. They are designed to be used via the netatalk protocol libraries. This page…
dconf – A configuration system Description dconf is a simple key/value storage system that is heavily optimised for reading. This makes it an ideal system for storing user preferences (which are read 1000s of times for each time the user changes one). It was created with this usecase in mind. All preferences are stored in…
dbus – event signalling that a dbus signal has been emitted Synopsis dbus [BUS=BUS_NAME] SIGNAL=SIGNAL INTERFACE=INTERFACE OBJPATH=PATH SENDER=SENDER DESTINATION=DESTINATION ARG0=VALUE ARGN=VALUE Description The dbus event is generated by the upstart-dbus-bridge(8) daemon when a D-Bus signal is emitted whose details match the dbus event condition and environment specified in a job’s start on or stop on…
daemon – Writing and packaging system daemons Description A daemon is a service process that runs in the background and supervises the system or provides functionality to other processes. Traditionally, daemons are implemented following a scheme originating in SysV Unix. Modern daemons should follow a simpler yet more powerful scheme (here called "new-style" daemons), as…
czmq – high-level C binding for ZeroMQ Synopsis #include <czmq.h> cc [‘flags’] ‘files’ -lzmq -lczmq [‘libraries’] Description Classes These classes provide the main socket and message API: • zsock(3) – working with ZeroMQ sockets (high-level) • zstr(3) – sending and receiving strings • zmsg(3) – working with multipart messages • zframe(3) – working with single…
cutodia Description Custodia is a omdular and pluggable Secrets Manager. It allows to serve retrieve, manage and store secrets for other applications. It is useful for distributed, stateless applications that use an image file base approach for instantiation like container based images. But it is alaso useful to manage distribution of key material across a…
ctdb – Clustered TDB Description CTDB is a clustered database component in clustered Samba that provides a high-availability load-sharing CIFS server cluster. The main functions of CTDB are: • Provide a clustered version of the TDB database with automatic rebuild/recovery of the databases upon node failures. • Monitor nodes in the cluster and services running…