Instead of using "*.txt" as reference name, use the actual destination title.
a client with a Wi-Fi and Ethernet both connected to the internet).
Consult the kernel documentation for details on this sysctl:
- https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt
+ https://www.kernel.org/doc/html/latest/networking/ip-sysctl.html
* The v239 change to turn on "net.ipv4.tcp_ecn" by default has been
reverted.
<para><function>sd_bus_creds_get_cgroup()</function> will retrieve
the control group path. See <ulink
- url="https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt">cgroups.txt</ulink>.
+ url="https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v1/index.html">Control Groups version 1</ulink>.
</para>
<para><function>sd_bus_creds_get_unit()</function> will retrieve
place, regardless of which environment the system is started in. For example, it is sufficient to
redirect the kernel console with a kernel command line argument such as <varname>console=</varname> to
get both kernel messages and a getty prompt on a serial TTY. See <ulink
- url="https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt"><filename>kernel-parameters.txt</filename></ulink>
- for more information on the <varname>console=</varname> kernel parameter.</para>
+ url="https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html">The kernel's command-line
+ parameters</ulink> for more information on the <varname>console=</varname> kernel parameter.</para>
<para><filename>systemd-getty-generator</filename> implements
<citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
device to resume from as the template argument.</para>
<para><filename>systemd-hibernate-resume</filename> only supports
- the in-kernel hibernation implementation, known as
- <ulink url="https://www.kernel.org/doc/Documentation/power/swsusp.txt">swsusp</ulink>.
+ the in-kernel hibernation implementation, see
+ <ulink url="https://www.kernel.org/doc/html/latest/power/swsusp.html">Swap suspend</ulink>.
Internally, it works by writing the major:minor of specified
device node to <filename>/sys/power/resume</filename>.</para>
temporary directory on a read-only <filename>/var/</filename> directory.</para>
<para>For details about overlay file systems, see <ulink
- url="https://www.kernel.org/doc/Documentation/filesystems/overlayfs.txt">overlayfs.txt</ulink>. Note
- that the semantics of overlay file systems are substantially
- different from normal file systems, in particular regarding
- reported device and inode information. Device and inode
- information may change for a file while it is being written
- to, and processes might see out-of-date versions of files at
- times. Note that this switch automatically derives the
- <literal>workdir=</literal> mount option for the overlay file
- system from the top-level directory tree, making it a sibling
- of it. It is hence essential that the top-level directory tree
- is not a mount point itself (since the working directory must
- be on the same file system as the top-most directory
- tree). Also note that the <literal>lowerdir=</literal> mount
- option receives the paths to stack in the opposite order of
- this switch.</para>
+ url="https://www.kernel.org/doc/html/latest/filesystems/overlayfs.html">Overlay Filesystem</ulink>.
+ Note that the semantics of overlay file systems are substantially different from normal file systems,
+ in particular regarding reported device and inode information. Device and inode information may
+ change for a file while it is being written to, and processes might see out-of-date versions of files
+ at times. Note that this switch automatically derives the <literal>workdir=</literal> mount option
+ for the overlay file system from the top-level directory tree, making it a sibling of it. It is hence
+ essential that the top-level directory tree is not a mount point itself (since the working directory
+ must be on the same file system as the top-most directory tree). Also note that the
+ <literal>lowerdir=</literal> mount option receives the paths to stack in the opposite order of this
+ switch.</para>
<para>Note that this option cannot be used to replace the root file system of the container with an overlay
file system. However, the <option>--volatile=</option> option described above provides similar functionality,
<listitem><para>Sets the adjustment value for the Linux kernel's Out-Of-Memory (OOM) killer score for
executed processes. Takes an integer between -1000 (to disable OOM killing of processes of this unit)
and 1000 (to make killing of processes of this unit under memory pressure very likely). See <ulink
- url="https://www.kernel.org/doc/Documentation/filesystems/proc.txt">proc.txt</ulink> for details. If
- not specified defaults to the OOM score adjustment level of the service manager itself, which is
- normally at 0.</para>
+ url="https://www.kernel.org/doc/html/latest/filesystems/proc.html">The /proc Filesystem</ulink> for
+ details. If not specified defaults to the OOM score adjustment level of the service manager itself,
+ which is normally at 0.</para>
<para>Use the <varname>OOMPolicy=</varname> setting of service units to configure how the service
manager shall react to the kernel OOM killer or <command>systemd-oomd</command> terminating a process of the service. See
</row></thead>
<tbody>
<row><entry><varname>bond</varname></entry>
- <entry>A bond device is an aggregation of all its slave devices. See <ulink url="https://www.kernel.org/doc/Documentation/networking/bonding.txt">Linux Ethernet Bonding Driver HOWTO</ulink> for details.</entry></row>
+ <entry>A bond device is an aggregation of all its slave devices. See <ulink url="https://www.kernel.org/doc/html/latest/networking/bonding.html">Linux Ethernet Bonding Driver HOWTO</ulink> for details.</entry></row>
<row><entry><varname>bridge</varname></entry>
<entry>A bridge device is a software switch, and each of its slave devices and the bridge itself are ports of the switch.</entry></row>
<entry>Media Access Control Security (MACsec) is an 802.1AE IEEE industry-standard security technology that provides secure communication for all traffic on Ethernet links. MACsec provides point-to-point security on Ethernet links between directly connected nodes and is capable of identifying and preventing most security threats.</entry></row>
<row><entry><varname>vrf</varname></entry>
- <entry>A Virtual Routing and Forwarding (<ulink url="https://www.kernel.org/doc/Documentation/networking/vrf.txt">VRF</ulink>) interface to create separate routing and forwarding domains.</entry></row>
+ <entry>A Virtual Routing and Forwarding (<ulink url="https://www.kernel.org/doc/html/latest/networking/vrf.html">VRF</ulink>) interface to create separate routing and forwarding domains.</entry></row>
<row><entry><varname>vcan</varname></entry>
<entry>The virtual CAN driver (vcan). Similar to the network loopback devices, vcan offers a virtual local CAN interface.</entry></row>
</variablelist>
<para>For more detail information see
- <ulink url="https://www.kernel.org/doc/Documentation/networking/bonding.txt">
+ <ulink url="https://www.kernel.org/doc/html/latest/networking/bonding.html">
Linux Ethernet Bonding Driver HOWTO</ulink></para>
</refsect1>
enable IP packet forwarding for the specified address family. This controls the
<filename>net.ipv4.ip_forward</filename> and <filename>net.ipv6.conf.all.forwarding</filename>
sysctl options of the network interface (see
- <ulink url="https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt">ip-sysctl.txt</ulink>
+ <ulink url="https://www.kernel.org/doc/html/latest/networking/ip-sysctl.html">IP Sysctl</ulink>
for details about sysctl options). Defaults to <literal>no</literal>.</para>
<para>Note: this setting controls a global kernel option, and does so one way only: if a
section, see below.</para>
<para>Also see
- <ulink url="https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt">ip-sysctl.txt</ulink>
+ <ulink url="https://www.kernel.org/doc/html/latest/networking/ip-sysctl.html">IP Sysctl</ulink>
in the kernel documentation regarding <literal>accept_ra</literal>, but note that systemd's
setting of <constant>1</constant> (i.e. true) corresponds to kernel's setting of
<constant>2</constant>.</para>
<literal>cpu.max</literal> attribute on the unified control group hierarchy and
<literal>cpu.cfs_quota_us</literal> on legacy. For details about these control group attributes, see <ulink
url="https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v2.html">Control Groups v2</ulink> and <ulink
- url="https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt">sched-bwc.txt</ulink>.
+ url="https://www.kernel.org/doc/html/latest/scheduler/sched-bwc.html">CFS Bandwidth Control</ulink>.
Setting <varname>CPUQuota=</varname> to an empty value unsets the quota.</para>
<para>Example: <varname>CPUQuota=20%</varname> ensures that the executed processes will never get more than
<term><varname>USBFunctionDescriptors=</varname></term>
<listitem><para>Configure the location of a file containing
<ulink
- url="https://www.kernel.org/doc/Documentation/usb/functionfs.txt">USB
+ url="https://www.kernel.org/doc/html/latest/usb/functionfs.html">USB
FunctionFS</ulink> descriptors, for implementation of USB
gadget functions. This is used only in conjunction with a
socket unit with <varname>ListenUSBFunction=</varname>
<varlistentry>
<term><varname>ListenUSBFunction=</varname></term>
<listitem><para>Specifies a <ulink
- url="https://www.kernel.org/doc/Documentation/usb/functionfs.txt">USB
+ url="https://www.kernel.org/doc/html/latest/usb/functionfs.html">USB
FunctionFS</ulink> endpoints location to listen on, for
implementation of USB gadget functions. This expects an
absolute file system path of a FunctionFS mount point as the argument.
the security label of the FIFO, or the security label for the
incoming or outgoing connections of the socket, respectively.
See <ulink
- url="https://www.kernel.org/doc/Documentation/security/Smack.txt">Smack.txt</ulink>
+ url="https://www.kernel.org/doc/html/latest/admin-guide/LSM/Smack.html">Smack</ulink>
for details.</para></listitem>
</varlistentry>
<para>Processes systemd spawns are placed in individual Linux
control groups named after the unit which they belong to in the
private systemd hierarchy. (see <ulink
- url="https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt">cgroups.txt</ulink>
+ url="https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v1/index.html">Control Groups version 1</ulink>
for more information about control groups, or short "cgroups").
systemd uses this to effectively keep track of processes. Control
group information is maintained in the kernel, and is accessible
/* Serializes one file in the cpio format understood by the kernel initrd logic.
*
- * See: https://www.kernel.org/doc/Documentation/early-userspace/buffer-format.txt */
+ * See: https://www.kernel.org/doc/html/latest/driver-api/early-userspace/buffer-format.html */
if (contents_size > UINT32_MAX) /* cpio cannot deal with > 32bit file sizes */
return EFI_LOAD_ERROR;
static void drop_caches_now(void) {
int r;
- /* Drop file system caches now. See https://www.kernel.org/doc/Documentation/sysctl/vm.txt for
- * details. We write "2" into /proc/sys/vm/drop_caches to ensure dentries/inodes are flushed, but not
- * more. */
+ /* Drop file system caches now. See https://www.kernel.org/doc/html/latest/admin-guide/sysctl/vm.html
+ * for details. We write "2" into /proc/sys/vm/drop_caches to ensure dentries/inodes are flushed, but
+ * not more. */
r = write_string_file("/proc/sys/vm/drop_caches", "2\n", WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
[Unit]
Description=Huge Pages File System
-Documentation=https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt
+Documentation=https://www.kernel.org/doc/html/latest/admin-guide/mm/hugetlbpage.html
Documentation=https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
DefaultDependencies=no
Before=sysinit.target
[Unit]
Description=FUSE Control File System
-Documentation=https://www.kernel.org/doc/Documentation/filesystems/fuse.txt
+Documentation=https://www.kernel.org/doc/html/latest/filesystems/fuse.html
Documentation=https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
DefaultDependencies=no
ConditionPathExists=/sys/fs/fuse/connections
[Unit]
Description=Kernel Configuration File System
-Documentation=https://www.kernel.org/doc/Documentation/filesystems/configfs/configfs.txt
+Documentation=https://www.kernel.org/doc/html/latest/filesystems/configfs.html
Documentation=https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
DefaultDependencies=no
ConditionPathExists=/sys/kernel/config
[Unit]
Description=Kernel Debug File System
-Documentation=https://www.kernel.org/doc/Documentation/filesystems/debugfs.txt
+Documentation=https://www.kernel.org/doc/html/latest/filesystems/debugfs.html
Documentation=https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
DefaultDependencies=no
ConditionPathExists=/sys/kernel/debug
[Unit]
Description=Kernel Trace File System
-Documentation=https://www.kernel.org/doc/Documentation/trace/ftrace.txt
+Documentation=https://www.kernel.org/doc/html/latest/trace/ftrace.html
Documentation=https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
DefaultDependencies=no
ConditionVirtualization=!lxc