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https://github.com/systemd/systemd.git
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6d86f4bd11
This little new command can parse, validate, normalize calendar events, and calculate when they will elapse next. This should be useful for anyone writing calendar events and who'd like to validate the expression before running them as timer units.
441 lines
17 KiB
XML
441 lines
17 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-analyze"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-analyze</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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<author>
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<contrib>Developer</contrib>
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<firstname>Harald</firstname>
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<surname>Hoyer</surname>
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<email>harald@redhat.com</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-analyze</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-analyze</refname>
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<refpurpose>Analyze system boot-up performance</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg>time</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">blame</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">critical-chain</arg>
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<arg choice="opt" rep="repeat"><replaceable>UNIT</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">plot</arg>
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<arg choice="opt">> file.svg</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">dot</arg>
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<arg choice="opt" rep="repeat"><replaceable>PATTERN</replaceable></arg>
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<arg choice="opt">> file.dot</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">dump</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">set-log-level</arg>
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<arg choice="plain"><replaceable>LEVEL</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">set-log-target</arg>
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<arg choice="plain"><replaceable>TARGET</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">get-log-level</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">get-log-target</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">syscall-filter</arg>
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<arg choice="opt"><replaceable>SET</replaceable>…</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">verify</arg>
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<arg choice="opt" rep="repeat"><replaceable>FILES</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">calendar</arg>
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<arg choice="plain" rep="repeat"><replaceable>SPECS</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-analyze</command> may be used to determine
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system boot-up performance statistics and retrieve other state and
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tracing information from the system and service manager, and to
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verify the correctness of unit files.</para>
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<para><command>systemd-analyze time</command> prints the time
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spent in the kernel before userspace has been reached, the time
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spent in the initial RAM disk (initrd) before normal system
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userspace has been reached, and the time normal system userspace
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took to initialize. Note that these measurements simply measure
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the time passed up to the point where all system services have
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been spawned, but not necessarily until they fully finished
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initialization or the disk is idle.</para>
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<para><command>systemd-analyze blame</command> prints a list of
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all running units, ordered by the time they took to initialize.
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This information may be used to optimize boot-up times. Note that
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the output might be misleading as the initialization of one
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service might be slow simply because it waits for the
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initialization of another service to complete.</para>
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<para><command>systemd-analyze critical-chain
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[<replaceable>UNIT…</replaceable>]</command> prints a tree of
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the time-critical chain of units (for each of the specified
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<replaceable>UNIT</replaceable>s or for the default target
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otherwise). The time after the unit is active or started is
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printed after the "@" character. The time the unit takes to start
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is printed after the "+" character. Note that the output might be
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misleading as the initialization of one service might depend on
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socket activation and because of the parallel execution of
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units.</para>
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<para><command>systemd-analyze plot</command> prints an SVG
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graphic detailing which system services have been started at what
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time, highlighting the time they spent on initialization.</para>
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<para><command>systemd-analyze dot</command> generates textual
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dependency graph description in dot format for further processing
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with the GraphViz
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<citerefentry project='die-net'><refentrytitle>dot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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tool. Use a command line like <command>systemd-analyze dot | dot
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-Tsvg > systemd.svg</command> to generate a graphical dependency
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tree. Unless <option>--order</option> or
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<option>--require</option> is passed, the generated graph will
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show both ordering and requirement dependencies. Optional pattern
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globbing style specifications (e.g. <filename>*.target</filename>)
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may be given at the end. A unit dependency is included in the
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graph if any of these patterns match either the origin or
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destination node.</para>
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<para><command>systemd-analyze dump</command> outputs a (usually
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very long) human-readable serialization of the complete server
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state. Its format is subject to change without notice and should
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not be parsed by applications.</para>
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<para><command>systemd-analyze set-log-level
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<replaceable>LEVEL</replaceable></command> changes the current log
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level of the <command>systemd</command> daemon to
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<replaceable>LEVEL</replaceable> (accepts the same values as
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<option>--log-level=</option> described in
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>).</para>
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<para><command>systemd-analyze set-log-target
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<replaceable>TARGET</replaceable></command> changes the current log
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target of the <command>systemd</command> daemon to
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<replaceable>TARGET</replaceable> (accepts the same values as
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<option>--log-target=</option>, described in
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>).</para>
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<para><command>systemd-analyze get-log-level</command>
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prints the current log level of the <command>systemd</command> daemon.</para>
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<para><command>systemd-analyze get-log-target</command>
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prints the current log target of the <command>systemd</command> daemon.</para>
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<para><command>systemd-analyze syscall-filter <optional><replaceable>SET</replaceable>…</optional></command>
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will list system calls contained in the specified system call set <replaceable>SET</replaceable>,
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or all known sets if no sets are specified. Argument <replaceable>SET</replaceable> must include
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the <literal>@</literal> prefix.</para>
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<para><command>systemd-analyze verify</command> will load unit files and print
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warnings if any errors are detected. Files specified on the command line will be
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loaded, but also any other units referenced by them. The full unit search path is
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formed by combining the directories for all command line arguments, and the usual unit
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load paths (variable <varname>$SYSTEMD_UNIT_PATH</varname> is supported, and may be
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used to replace or augment the compiled in set of unit load paths; see
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
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All units files present in the directories containing the command line arguments will
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be used in preference to the other paths.</para>
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<para><command>systemd-analyze calendar</command> will parse and normalize repetitive calendar time events, and
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will calculate when they will elapse next. This takes the same input as the <varname>OnCalendar=</varname> setting
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in <citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>, following the
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syntax described in
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<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
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<para>If no command is passed, <command>systemd-analyze
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time</command> is implied.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--user</option></term>
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<listitem><para>Operates on the user systemd
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instance.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--system</option></term>
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<listitem><para>Operates on the system systemd instance. This
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is the implied default.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--order</option></term>
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<term><option>--require</option></term>
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<listitem><para>When used in conjunction with the
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<command>dot</command> command (see above), selects which
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dependencies are shown in the dependency graph. If
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<option>--order</option> is passed, only dependencies of type
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<varname>After=</varname> or <varname>Before=</varname> are
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shown. If <option>--require</option> is passed, only
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dependencies of type <varname>Requires=</varname>,
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<varname>Requisite=</varname>,
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<varname>Wants=</varname> and <varname>Conflicts=</varname>
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are shown. If neither is passed, this shows dependencies of
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all these types.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--from-pattern=</option></term>
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<term><option>--to-pattern=</option></term>
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<listitem><para>When used in conjunction with the
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<command>dot</command> command (see above), this selects which
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relationships are shown in the dependency graph. Both options
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require a
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<citerefentry project='die-net'><refentrytitle>glob</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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pattern as an argument, which will be matched against the
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left-hand and the right-hand, respectively, nodes of a
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relationship.</para>
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<para>Each of these can be used more than once, in which case
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the unit name must match one of the values. When tests for
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both sides of the relation are present, a relation must pass
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both tests to be shown. When patterns are also specified as
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positional arguments, they must match at least one side of the
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relation. In other words, patterns specified with those two
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options will trim the list of edges matched by the positional
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arguments, if any are given, and fully determine the list of
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edges shown otherwise.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--fuzz=</option><replaceable>timespan</replaceable></term>
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<listitem><para>When used in conjunction with the
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<command>critical-chain</command> command (see above), also
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show units, which finished <replaceable>timespan</replaceable>
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earlier, than the latest unit in the same level. The unit of
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<replaceable>timespan</replaceable> is seconds unless
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specified with a different unit, e.g.
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"50ms".</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--man=no</option></term>
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<listitem><para>Do not invoke man to verify the existence of
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man pages listed in <varname>Documentation=</varname>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--generators</option></term>
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<listitem><para>Invoke unit generators, see
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<citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
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Some generators require root privileges. When run under a
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normal users, enabling generators will generally result in
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some warnings.</para></listitem>
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</varlistentry>
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<xi:include href="user-system-options.xml" xpointer="host" />
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<xi:include href="user-system-options.xml" xpointer="machine" />
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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<xi:include href="standard-options.xml" xpointer="no-pager" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned, a non-zero failure code
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otherwise.</para>
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</refsect1>
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<refsect1>
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<title>Examples for <command>dot</command></title>
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<example>
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<title>Plots all dependencies of any unit whose name starts with
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<literal>avahi-daemon</literal></title>
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<programlisting>$ systemd-analyze dot 'avahi-daemon.*' | dot -Tsvg > avahi.svg
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$ eog avahi.svg</programlisting>
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</example>
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<example>
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<title>Plots the dependencies between all known target units</title>
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<programlisting>$ systemd-analyze dot --to-pattern='*.target' --from-pattern='*.target' | dot -Tsvg > targets.svg
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$ eog targets.svg</programlisting>
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</example>
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</refsect1>
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<refsect1>
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<title>Examples for <command>verify</command></title>
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<para>The following errors are currently detected:</para>
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<itemizedlist>
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<listitem><para>unknown sections and directives,
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</para></listitem>
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<listitem><para>missing dependencies which are required to start
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the given unit,</para></listitem>
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<listitem><para>man pages listed in
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<varname>Documentation=</varname> which are not found in the
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system,</para></listitem>
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<listitem><para>commands listed in <varname>ExecStart=</varname>
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and similar which are not found in the system or not
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executable.</para></listitem>
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</itemizedlist>
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<example>
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<title>Misspelt directives</title>
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<programlisting>$ cat ./user.slice
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[Unit]
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WhatIsThis=11
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Documentation=man:nosuchfile(1)
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Requires=different.service
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[Service]
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Description=x
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$ systemd-analyze verify ./user.slice
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[./user.slice:9] Unknown lvalue 'WhatIsThis' in section 'Unit'
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[./user.slice:13] Unknown section 'Service'. Ignoring.
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Error: org.freedesktop.systemd1.LoadFailed:
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Unit different.service failed to load:
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No such file or directory.
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Failed to create user.slice/start: Invalid argument
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user.slice: man nosuchfile(1) command failed with code 16
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</programlisting>
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</example>
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<example>
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<title>Missing service units</title>
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<programlisting>$ tail ./a.socket ./b.socket
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==> ./a.socket <==
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[Socket]
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ListenStream=100
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==> ./b.socket <==
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[Socket]
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ListenStream=100
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Accept=yes
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$ systemd-analyze verify ./a.socket ./b.socket
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Service a.service not loaded, a.socket cannot be started.
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Service b@0.service not loaded, b.socket cannot be started.
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</programlisting>
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</example>
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</refsect1>
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<xi:include href="less-variables.xml" />
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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