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diff --git a/man/sysctl.d.xml b/man/sysctl.d.xml
index 4f30276ad..db53b4959 100644
--- a/man/sysctl.d.xml
+++ b/man/sysctl.d.xml
@@ -54,51 +54,78 @@
Description
- systemd uses configuration
- files from the above directories to configure
- sysctl8
- kernel parameters during boot.
+ At boot,
+ systemd-sysctl.service8
+ reads configuration files from the above directories
+ to configure
+ sysctl8
+ kernel parameters.
- Configuration Format
-
- The configuration files contain a list of
- variable assignments, separated by newlines. Empty
- lines and lines whose first non-whitespace character
- is # or ; are ignored.
-
- Note that both / and . are accepted as label
- separators within sysctl variable
- names. kernel.domainname=foo and
- kernel/domainname=foo hence are
- entirely equivalent.
+ Configuration Format
+
+ The configuration files contain a list of
+ variable assignments, separated by newlines. Empty
+ lines and lines whose first non-whitespace character
+ is # or ; are
+ ignored.
+
+ Note that either / or
+ . may be used as separators within
+ sysctl variable names. If the first separator is a
+ slash, remaining slashes and dots are left intact. If
+ the first separator is a dot, dots and slashes are
+ interchanged. kernel.domainname=foo
+ and kernel/domainname=foo are
+ equivalent and will cause foo to
+ be written to
+ /proc/sys/kernel/domainname.
+ Either
+ net.ipv4.conf.enp3s0/200.forwarding
+ or
+ net/ipv4/conf/enp3s0.200/forwarding
+ may be used to refer to
+ /proc/sys/net/ipv4/conf/enp3s0.200/forwarding.
+
Each configuration file shall be named in the
- style of <program>.conf.
- Files in /run/ override files
- with the same name in /usr/lib/.
- Files in /etc override files with
- the same name in /run/ and
- /usr/lib/. Packages should
- install their configuration files in
+ style of program.conf.
+ Files in /etc/ override files
+ with the same name in /usr/lib/
+ and /run/. Files in
+ /run/ override files with the same
+ name in /usr/lib/. Packages
+ should install their configuration files in
/usr/lib/. Files in
/etc/ are reserved for the local
administrator, who may use this logic to override the
- configuration installed by vendor packages. All
- configuration files are sorted by their name in
- alphabetical order, regardless in which of the
- directories they reside, to guarantee that a specific
- configuration file takes precedence over another file
- with an alphabetically earlier name, if both files
- contain the same variable setting.
+ configuration files installed by vendor packages. All
+ configuration files are sorted by their filename in
+ lexicographic order, regardless of which of the
+ directories they reside in. If multiple files specify the
+ same variable name, the entry in the file with the
+ lexicographically latest name will be applied. It is
+ recommended to prefix all filenames with a two-digit
+ number and a dash, to simplify the ordering of the
+ files.
If the administrator wants to disable a
- configuration file supplied by the vendor the
+ configuration file supplied by the vendor, the
recommended way is to place a symlink to
/dev/null in
- /etc/sysctl.d carrying with the
- same name.
+ /etc/sysctl.d/ bearing the
+ same filename.
+
+ The settings configured with
+ sysctl.d files will be applied
+ early on boot. The network interface-specific options
+ will also be applied individually for each network
+ interface as it shows up in the system. (More
+ specifically,
+ net.ipv4.conf.*,
+ net.ipv6.conf.*,
+ net.ipv4.neigh.* and net.ipv6.neigh.*)
@@ -115,6 +142,8 @@ kernel.domainname=example.com
See Also
systemd1,
+ systemd-sysctl.service8,
+ systemd-delta1,
sysctl8,
sysctl.conf5