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in systemd(1)
Based on a suggestion of Ken Coar.
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https://bugzilla.redhat.com/show_bug.cgi?id=634736
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This should be moved to man pages, but for now the C code is included directly.
Suggested by Zbyszek.
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"each device" was suggesting that this service might be instantiated
multiple times. "hibernation resume" was too jargon-y.
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hibernate-resume-generator understands resume= kernel command line parameter
and instantiates the systemd-resume@.service accordingly if it is passed.
This enables resume from hibernation using device specified on the kernel
command line, and it may be specified either as "/dev/disk/by-foo/bar"
or "FOO=bar", not only "/dev/sdXY" which is understood by the in-kernel
implementation.
So now resume= is brought on par with root= in terms of possible ways to
specify a device.
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/sys/power/resume.
This can be used to initiate a resume from hibernation by path to a swap
device containing the hibernation image.
The respective templated unit is also added. It is instantiated using
path to the desired resume device.
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https://bugs.freedesktop.org/show_bug.cgi?id=82485
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Also, change the default action on a system start-up timeout to powering off.
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When this system-wide start-up timeout is hit we execute one of the
failure actions already implemented for services that fail.
This should not only be useful on embedded devices, but also on laptops
which have the power-button reachable when the lid is closed. This
devices, when in a backpack might get powered on by accident due to the
easily reachable power button. We want to make sure that the system
turns itself off if it starts up due this after a while.
When the system manages to fully start-up logind will suspend the
machine by default if the lid is closed. However, in some cases we don't
even get as far as logind, and the boot hangs much earlier, for example
because we ask for a LUKS password that nobody ever enters.
Yeah, this is a real-life problem on my Yoga 13, which has one of those
easily accessible power buttons, even if the device is closed.
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This is useful for services that simply want to run something on
shutdown, but not at bootup. They should only set ExecStop= but leave
ExecStart= unset.
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and STOPPING=1 sd_notify() messages
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This turns journalctl to the counterpart of systemd-cat.
Messages sent with
systemd-cat --identifier foo --prioritiy debug
can now be shown with
journalctl --identifier foo --prioritiy debug
"--identifier" is not merged with "--unit" to make a clear
distinction between syslog and systemd units.
syslog identifiers can be chosen freely by anyone.
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This is what we have done so far for all other time values, and hence we
should do this here. This indicates the default unit of time values
specified here, if they don't contain a unit.
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This reverts commit cf8bd44339b00330fdbc91041d6731ba8aba9fec.
Needs more discussion on the mailing list.
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UIDs/GIDs from
This way we can guarantee a limited amount of compatibility with
login.defs, by generate an appopriate "r" line out of it, on package
installation.
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This makes possible to spawn service instances triggered by socket with
MLS/MCS SELinux labels which are created based on information provided by
connected peer.
Implementation of label_get_child_label derived from xinetd.
Reviewed-by: Paul Moore <pmoore@redhat.com>
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Also, provide an example for -u.
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The interface for creating tuntap devices should be ported to rtnl so it would support the same settings
as other kinds. In the meantime, the best one can do is to drop in a .link file to set the desired options.
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Remove the sd_ prefix from internal functions and get rid of the sd_memfd
type. As a memfd is now just a native file descriptor, we can get rid of our
own wrapper type, and also use close() and dup() on them directly.
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This allows the search/routing domanis to be specified per link/network and be passed
on to resolved.
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This option will also apply to the search domains, so make it plural.
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TCP_DEFER_ACCEPT Allow a listener to be awakened only when data
arrives on the socket. If TCP_DEFER_ACCEPT set on a server-side
listening socket, the TCP/IP stack will not to wait for the final
ACK packet and not to initiate the process until the first packet
of real data has arrived. After sending the SYN/ACK, the server will
then wait for a data packet from a client. Now, only three packets
will be sent over the network, and the connection establishment delay
will be significantly reduced.
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The tcp keep alive variables now can be configured via conf
parameter. Follwing variables are now supported by this patch.
tcp_keepalive_intvl: The number of seconds between TCP keep-alive probes
tcp_keepalive_probes: The maximum number of TCP keep-alive probes to
send before giving up and killing the connection if no response is
obtained from the other end.
tcp_keepalive_time: The number of seconds a connection needs to be
idle before TCP begins sending out keep-alive probes.
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Most routers will send garbage, so make this opt-in only.
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This reverts commit 9528592ff8d7ff361da430285deba8196e8984d5.
Apparently TFO is actually the default at least for the server side now.
Also the setsockopt doesn't actually take a bool, but a qlen integer.
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TCP Fast Open (TFO) speeds up the opening of successiveTCP)
connections between two endpoints.It works by using a TFO cookie
in the initial SYN packet to authenticate a previously connected
client. It starts sending data to the client before the receipt
of the final ACK packet of the three way handshake is received,
skipping a round trip and lowering the latency in the start of
transmission of data.
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This patch adds support for TCP TCP_NODELAY socket option. This can be
configured via NoDelay conf parameter. TCP Nagle's algorithm works by
combining a number of small outgoing messages, and sending them all at
once. This controls the TCP_NODELAY socket option.
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Avoids triggering timers prematurely on systems with significantly inaccurate
clocks, or some embedded platforms that lack one entirely.
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This causes machines without connectivity to hang where they would otherwise fail. Keep it
opt-in for now, but consider whether we sholud just drop it.
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directory when looking for unit file drop-ins.
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Newer kernels export meta-information about the origin of an ifname. Respect this
from the ifname rename logic. We do not rename any interfaces that was originally
named by userspace, nor once which have already been renamed from userspace.
Moreover, we optionally do not (the default) rename interfaces which the kernel
claims to have named in a predictable way.
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Noticed by thp on #systemd.
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