I am writing a program that must determine certain things about services. How can I, or my program, determine which services are started automatically when a given target becomes active. It is my impression that just looking in the target's .wants directory is inadequate because of other... (2 Replies)
Hallo
I don't know where to put my question so I put it here.
I want that systemd let run a script but only on shutdown or reboot
and before the system umount the mounted devices.
I look on google but only a little information is found and not working
Until no, I don't find an solution for... (1 Reply)
Hello All,
OS: openSUSE 13.1 (Bottle) (armv7hl)
uname -a: Linux linux.site 3.14.14-cubox-i #1 SMP Sat Sep 13 03:48:24 UTC 2014 armv7l armv7l armv7l GNU/Linux
So this is my first attempt at starting a service at boot with systemd. I've done this with inittab in the past,
but I'm having... (0 Replies)
Hello All,
SNMPD dying after 2 mins once it started. Here is the configuration
Oct 12 04:43:00 localhost systemd: Starting Simple Network Management Protocol (SNMP) Daemon....
Oct 12 04:43:00 localhost snmpd: dlopen failed: /usr/lib64/libcmaX64.so: cannot open shared object file: No such... (1 Reply)
Hi,
I hope somebody can help me. I wand to Move my NIS server on Solaris 10
(there are 2 Slaves on Linux) to CentOS7.
Do you have any procedures or experience to do this?
Thanking in anticipation! (2 Replies)
I would like the smb and nmb to start on boot.
In the terminal (as root) I did:
/sbin/chkconfig smb --addor
chkconfig --add sambaor
chkconfig --add /sbin/smbdresault is message like below :
error reading information on service smb: No such file or directory
Please use CODE tags as... (2 Replies)
Quite an obscure question I think.
We have a rebuild process for remote sites that allows us to PXE rebuild a till (actually a PC with a touch screen and various fancy bits) running CentOS. The current CentOS5 tills work just fine with a tar image restore and some personalisation. Sadly,... (4 Replies)
Can anyone explain me why yum still working when I stop http service on my localmachine.
If I'm not wrong, yum repository use port 80 and 443, so stop http service should technicly stop possibility to install packages ? (6 Replies)
Hello,
My makefiles are set up to generate an environment specific build directory based on the local configuration and some values passed to make. It generally looks like,
# compilers, may be passed to make
CC++ = g++
FCOMP = gfortran
# version of program, may be passed to make
ver =... (4 Replies)
Discussion started by: LMHmedchem
4 Replies
LEARN ABOUT CENTOS
systemd-readahead-done.service
SYSTEMD-READAHEAD-REPLAY.SERVICE(8) systemd-readahead-replay.service SYSTEMD-READAHEAD-REPLAY.SERVICE(8)NAME
systemd-readahead-replay.service, systemd-readahead-collect.service, systemd-readahead-done.service, systemd-readahead-done.timer, systemd-
readahead - Disk read ahead logic
SYNOPSIS
systemd-readahead-replay.service
systemd-readahead-collect.service
systemd-readahead-done.service
systemd-readahead-done.timer
/usr/lib/systemd/systemd-readahead/systemd-readahead [OPTIONS...] COMMAND [DIRECTORY | FILE]
DESCRIPTION
systemd-readahead-collect.service is a service that collects disk usage patterns at boot time. systemd-readahead-replay.service is a
service that replays this access data collected at the subsequent boot. Since disks tend to be magnitudes slower than RAM, this is intended
to improve boot speeds by pre-loading early at boot all data on disk that is known to be read for the complete boot process.
systemd-readahead-done.service is executed a short while after boot completed and signals systemd-readahead-collect.service to end data
collection. On this signal, this service will then sort the collected disk accesses and store information about them in /.readahead.
Normally, both systemd-readahead-collect.service and systemd-readahead-replay.service are activated at boot so that access patterns from
the preceding boot are replayed and new data collected for the subsequent boot. However, on read-only media where the collected data cannot
be stored, it might be a good idea to disable systemd-readahead-collect.service.
On rotating media, when replaying disk accesses at early boot, systemd-readahead-replay.service will order read requests by their location
on disk. On non-rotating media, they will be ordered by their original access timestamp. If the file system supports it,
systemd-readahead-collect.service will also defragment and rearrange files on disk to optimize subsequent boot times.
OPTIONS
systemd-readahead understands the following options:
-h, --help
Prints a short help text and exits.
--max-files=
Maximum number of files to read ahead. Only valid for thes collect command.
--file-size-max=
Maximum size of files in bytes to read ahead. Only valid for the collect and replay commands.
--timeout=
Maximum time in microseconds to spend collecting data. Only valid for the collect command.
COMMANDS
The following commands are understood by systemd-readahead:
collect [DIRECTORY]
Collect read-ahead data on early boot. When terminating, it will write out a pack file to the indicated directory containing the
read-ahead data.
replay [DIRECTORY]
Perform read-ahead on the specified directory tree.
analyze [FILE]
Dumps the content of the read-ahead pack file to the terminal. For each file, the output lists approximately how much will be read
ahead by the replay command.
SEE ALSO systemd(1)systemd 208SYSTEMD-READAHEAD-REPLAY.SERVICE(8)