[Solved] Systemd: how to disable core dumps on application crashes?

Hi,
I'm sorry if this is the wrong forum, but I just couldn't find a place that's really suitable for such a question.
I have a really annoying problem with systemd: I'm developing software, which sometimes crashes. And when it crashes, I sometimes want to examine core dumps.
The problem is that systemd seems to force coredumps, but saves them in some kind of obscure internal storage, where I don't have a clue about how to extract them from.
The only hint that I could find was http://lists.freedesktop.org/archives/s … 04643.html which isn't really helpful.
The problem is that systemd installs its coredump handler on boot:
[root@neptun ~]# cat /proc/sys/kernel/core_pattern
|/usr/lib/systemd/systemd-coredump %p %u %g %s %t %e
Is there any way to disable this? I don't want core dumps to be generated unless I need them. Just clearing that file on boot seems too hackish for me, does anybody know if there is a systemd
configuration option to turn coredumps off?
Cheers,
andr3as
Last edited by andr3as (2012-12-15 01:42:24)

The .conf file was recently renamed so the symlink must be called different as well. But I found it needs to contain something to actually overload systemd's default
# echo kernel.core_pattern= > /etc/sysctl.d/50-coredump.conf
# /lib/systemd/systemd-sysctl
# cat /proc/sys/kernel/core_pattern # should be empty
Last edited by Spider.007 (2013-07-13 10:06:41)

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Based on advice in other threads, I did this:
# ln -s /dev/null /etc/sysctl.d/coredump.conf
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but it didn't work; /proc/sys/kernel/core_pattern still contains "systemd-coredump ...". Furthermore, the processes that I have dumping core do so when using a lot (many GB) of memory, so the core dumps are huge. This causes systemd-journald to eat up 100% CPU for a long time after core dumps.
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Last edited by tavianator (2013-05-22 21:54:15)

Hello tavianator.
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Edit: I used the naming convention from /lib/sysctl.d/ which is also "50-coredump.conf".
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$ amixer -c 0 contents
numid=42,iface=CARD,name='Front Headphone Jack'
; type=BOOLEAN,access=r-------,values=1
: values=on
numid=44,iface=CARD,name='Front Mic Jack'
; type=BOOLEAN,access=r-------,values=1
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numid=46,iface=CARD,name='HDMI Phantom Jack'
; type=BOOLEAN,access=r-------,values=1
: values=on
numid=45,iface=CARD,name='Line Jack'
; type=BOOLEAN,access=r-------,values=1
: values=off
numid=40,iface=CARD,name='Line Out CLFE Jack'
; type=BOOLEAN,access=r-------,values=1
: values=off
numid=38,iface=CARD,name='Line Out Front Jack'
; type=BOOLEAN,access=r-------,values=1
: values=on
numid=41,iface=CARD,name='Line Out Side Jack'
; type=BOOLEAN,access=r-------,values=1
: values=off
numid=39,iface=CARD,name='Line Out Surround Jack'
; type=BOOLEAN,access=r-------,values=1
: values=off
numid=43,iface=CARD,name='Rear Mic Jack'
; type=BOOLEAN,access=r-------,values=1
: values=off
numid=47,iface=CARD,name='SPDIF Phantom Jack',index=1
; type=BOOLEAN,access=r-------,values=1
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; type=BOOLEAN,access=rw------,values=1
: values=on
numid=36,iface=MIXER,name='Master Playback Volume'
; type=INTEGER,access=rw---R--,values=1,min=0,max=42,step=0
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| dBscale-min=-63.00dB,step=1.50dB,mute=0
numid=13,iface=MIXER,name='Headphone Playback Switch'
; type=BOOLEAN,access=rw------,values=2
: values=on,on
numid=12,iface=MIXER,name='PCM Playback Switch'
; type=BOOLEAN,access=rw------,values=2
: values=on,on
numid=11,iface=MIXER,name='PCM Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
: values=31,31
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numid=28,iface=MIXER,name='Front Mic Boost Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
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| dBscale-min=0.00dB,step=10.25dB,mute=0
numid=24,iface=MIXER,name='Front Mic Playback Switch'
; type=BOOLEAN,access=rw------,values=2
: values=on,on
numid=23,iface=MIXER,name='Front Mic Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
: values=31,31
| dBscale-min=-34.50dB,step=1.50dB,mute=0
numid=2,iface=MIXER,name='Front Playback Switch'
; type=BOOLEAN,access=rw------,values=2
: values=on,on
numid=1,iface=MIXER,name='Front Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=42,step=0
: values=42,42
| dBscale-min=-63.00dB,step=1.50dB,mute=0
numid=4,iface=MIXER,name='Surround Playback Switch'
; type=BOOLEAN,access=rw------,values=2
: values=on,on
numid=3,iface=MIXER,name='Surround Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=42,step=0
: values=42,42
| dBscale-min=-63.00dB,step=1.50dB,mute=0
numid=6,iface=MIXER,name='Center Playback Switch'
; type=BOOLEAN,access=rw------,values=1
: values=on
numid=5,iface=MIXER,name='Center Playback Volume'
; type=INTEGER,access=rw---R--,values=1,min=0,max=42,step=0
: values=42
| dBscale-min=-63.00dB,step=1.50dB,mute=0
numid=8,iface=MIXER,name='LFE Playback Switch'
; type=BOOLEAN,access=rw------,values=1
: values=on
numid=7,iface=MIXER,name='LFE Playback Volume'
; type=INTEGER,access=rw---R--,values=1,min=0,max=42,step=0
: values=42
| dBscale-min=-63.00dB,step=1.50dB,mute=0
numid=26,iface=MIXER,name='Line Playback Switch'
; type=BOOLEAN,access=rw------,values=2
: values=on,on
numid=25,iface=MIXER,name='Line Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
: values=31,31
| dBscale-min=-34.50dB,step=1.50dB,mute=0
numid=16,iface=MIXER,name='Capture Switch'
; type=BOOLEAN,access=rw------,values=2
: values=on,on
numid=18,iface=MIXER,name='Capture Switch',index=1
; type=BOOLEAN,access=rw------,values=2
: values=on,on
numid=15,iface=MIXER,name='Capture Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
: values=0,0
| dBscale-min=-16.50dB,step=1.50dB,mute=0
numid=17,iface=MIXER,name='Capture Volume',index=1
; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
: values=0,0
| dBscale-min=-16.50dB,step=1.50dB,mute=0
numid=14,iface=MIXER,name='Loopback Mixing'
; type=ENUMERATED,access=rw------,values=1,items=2
; Item #0 'Disabled'
; Item #1 'Enabled'
: values=0
numid=35,iface=MIXER,name='IEC958 Default PCM Playback Switch'
; type=BOOLEAN,access=rw------,values=1
: values=off
numid=31,iface=MIXER,name='IEC958 Playback Con Mask'
; type=IEC958,access=r-------,values=1
: values=[AES0=0x0f AES1=0xff AES2=0x00 AES3=0x00]
numid=32,iface=MIXER,name='IEC958 Playback Pro Mask'
; type=IEC958,access=r-------,values=1
: values=[AES0=0x0f AES1=0x00 AES2=0x00 AES3=0x00]
numid=33,iface=MIXER,name='IEC958 Playback Default'
; type=IEC958,access=rw------,values=1
: values=[AES0=0x04 AES1=0x00 AES2=0x00 AES3=0x00]
numid=34,iface=MIXER,name='IEC958 Playback Switch'
; type=BOOLEAN,access=rw------,values=1
: values=off
numid=30,iface=MIXER,name='Dynamic Power-Control'
; type=ENUMERATED,access=rw------,values=1,items=2
; Item #0 'Disabled'
; Item #1 'Enabled'
: values=0
numid=29,iface=MIXER,name='Independent HP'
; type=ENUMERATED,access=rw------,values=1,items=2
; Item #0 'OFF'
; Item #1 'ON'
: values=0
numid=19,iface=MIXER,name='Input Source'
; type=ENUMERATED,access=rw------,values=1,items=4
; Item #0 'Rear Mic'
; Item #1 'Front Mic'
; Item #2 'Line'
; Item #3 'Stereo Mixer'
: values=1
numid=20,iface=MIXER,name='Input Source',index=1
; type=ENUMERATED,access=rw------,values=1,items=4
; Item #0 'Rear Mic'
; Item #1 'Front Mic'
; Item #2 'Line'
; Item #3 'Stereo Mixer'
: values=0
numid=27,iface=MIXER,name='Rear Mic Boost Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
: values=0,0
| dBscale-min=0.00dB,step=10.25dB,mute=0
numid=22,iface=MIXER,name='Rear Mic Playback Switch'
; type=BOOLEAN,access=rw------,values=2
: values=off,off
numid=21,iface=MIXER,name='Rear Mic Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
: values=23,23
| dBscale-min=-34.50dB,step=1.50dB,mute=0
numid=10,iface=MIXER,name='Side Playback Switch'
; type=BOOLEAN,access=rw------,values=2
: values=on,on
numid=9,iface=MIXER,name='Side Playback Volume'
; type=INTEGER,access=rw---R--,values=2,min=0,max=42,step=0
: values=42,42
| dBscale-min=-63.00dB,step=1.50dB,mute=0
numid=49,iface=PCM,name='Capture Channel Map'
; type=INTEGER,access=r----R--,values=2,min=0,max=36,step=0
: values=0,0
| | TLV size error (257, 8, 0)!
numid=50,iface=PCM,name='Capture Channel Map',index=1
; type=INTEGER,access=r----R--,values=2,min=0,max=36,step=0
: values=0,0
| | TLV size error (257, 8, 0)!
numid=48,iface=PCM,name='Playback Channel Map'
; type=INTEGER,access=r----R--,values=8,min=0,max=36,step=0
: values=0,0,0,0,0,0,0,0
| | TLV size error (257, 8, 0)!
numid=51,iface=PCM,name='Playback Channel Map',device=1
; type=INTEGER,access=r----R--,values=2,min=0,max=36,step=0
: values=0,0
| | TLV size error (257, 8, 0)!
numid=52,iface=PCM,name='Playback Channel Map',device=2
; type=INTEGER,access=r----R--,values=2,min=0,max=36,step=0
: values=0,0
| | TLV size error (257, 8, 0)!
If I read the Alsa kernel docs right, the VIA driver simply does not provide any option to disable auto-muting: http://git.alsa-project.org/?p=alsa-ker … xt;hb=HEAD.
I would be glad if I had misread/misunderstood something or there were any other means of achieving what I am after? All I found so far is lots of posts where auto-muting did not work but very few people seem to want the opposite. FWIW, my old installation of Ubuntu 11.10 was working fine in that regard, i.e. it probably did not support auto-muting for my hardware.
Last edited by fax (2013-03-24 20:20:19)

Solved, well, good enough for me anyway. In alsamixer, I enabled "Independent HP". Independent HP means that two of the six surround channels get diverted to the headphones. Alsa creates a second device, one for line out and the other one for the headphones. It is a very neat feature that is meant to allow you to e.g. do a voice call with your headphones while you play music through the speakers at the same time. I can now choose in PulseAudio whether I want output to my headphones or the speakers. It required that in /etc/pulse/default.pa, I added the line "load-module module-alsa-sink device=hw:0,2" after this paragraph:
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Call it a bug or a missing feature, but it does not look like the Alsa snd_hda_codec_via driver allows to disable auto-muting.
Before the change to default.pa, PulseAudio already allows me to switch between two output devices - "analog output" and "analog headphones". "Analog headphones" however does the same thing as "analog output" and plays sound on the external speakers and not the headphones. I suspect that the PulseAudio module-udev-detect detects both Alsa devices but wires them wrongly.
The above still doesn't give me what I originally asked, i.e. sound on both speakers and headphones at the same time, but I realized that I don't really need that. I just need a way to switch on speakers occasionally while my headphones are plugged in.
Last edited by fax (2013-03-24 23:06:27)

[Solved] SystemD, how to start a service after network is up.

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Last edited by TheSaint (2013-07-15 03:12:37)

WonderWoofy wrote:It depends on what network management utility you use and therefore also how you connect. If you are using an ethernet connection, you could just use dhcpcd@<interface>.service. This is a very simple service, and the network.target will not be reached until the IP address and connectivity is established.
Meanwhile some good suggestion (like yours) came up, I've tried a couple of recipes. But dhcpcd.service didn't get it right. Maybe dhcpcd@<interface>.service, would work, I'll see later.
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Description=aria2 Service
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[Service]
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Group=aria2
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ExecReload=/usr/bin/kill -HUP $MAINPID
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Restart=on-failure
[Install]
WantedBy=multi-user.target
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I was doing a cron scheduled job, before using systemd boot, which was kicking minidlna every 5 minutes, since it was dieing often. I didn't discover what was the reason.
I think I'll have to study another recipe which sets up a timer and keep an eye on these two services, for the long term service. But even cron would suffice, I think.
WonderWoofy wrote:if you are using wireless, the only two real solutions would be to use netctl@<profile>.service, which too won't reach the network.target until a conplete connection is made
Yes I'm on wireless network and the interface plugged on USB . My intent should go beyond any particular configuration. Maybe because I'd like to show a working setup, which may fit for all configuration (90 % )
I have to admit that the actual solution do not care much whether the network is found, so I hope to get a smarter setup that counts on the necessary tools before try something. However it's proved that they fail when no connection to the router is done. But I'm preferring that they succeed.
WonderWoofy wrote: NetworkManager gets around this by implementing an additional service called (unimaginatively) NetworkManager-wait-online.service, which is pulled in automatically when you enable NetowrkManager.service.
As I stated above I'm expecting a solution that won't pull in so much dependencies. Even NM is my connection manager, on the server.
WonderWoofy wrote:
You probably also want to use Requisite=aria2c.service on the minidlna.service as well. This too means that it will be started after aria2c, but that it will not start at all if it is not running or fails.
Additionally, you could try using the Requisite configuration on the minidnla, while setting the aria2c to restart itself on failure. So that it will keep trying, and once it does, then minidlna will start.
looks like a dog biting the tail . It's much preferable a separated failure, just in case.
WonderWoofy wrote:Edit: Also, it is not SystemD. It is systemd (like other "daemon" binaries in *nix).
I'm quite sure I saw it somewhere, none of my inventions
Last edited by TheSaint (2013-07-13 07:10:33)

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According to:
http://blogs.sun.com/meena/entry/disabling_trace_in_sun_java
I can disable HTTP TRACE by either through:
1. Adding the following code into obj.conf
<Client method="TRACE">
AuthTrans fn="set-variable"
remove-headers="transfer-encoding"
set-headers="content-length: -1"
error="501"
</Client>
which I get 413 Request Entity Too Large
here is my obj.conf file:
# Sun Microsystems, Inc. - obj.conf
# You can edit this file, but comments and formatting changes
# might be lost when the admin server makes changes.
# Use only forward slashes in pathnames--backslashes can cause
# problems. See the documentation for more information.
<Object name="default">
<Client method="TRACE">
AuthTrans fn="set-variable" remove-headers="transfer-encoding" set-headers="content-length: -1" error="501"
</Client>
AuthTrans fn="match-browser" browser="*MSIE*" ssl-unclean-shutdown="true"
NameTrans fn="ntrans-j2ee" name="j2ee"
NameTrans fn="pfx2dir" from="/mc-icons" dir="D:/Sun/AppServer7U10/lib/icons" name="es-internal"
NameTrans fn="document-root" root="$docroot"
PathCheck fn="nt-uri-clean"
PathCheck fn="find-pathinfo"
PathCheck fn="find-index" index-names="index.html,home.html"
PathCheck fn="check-acl" acl="default"
ObjectType fn="type-by-extension"
ObjectType fn="force-type" type="text/plain"
Service method="(GET|HEAD)" type="magnus-internal/imagemap" fn="imagemap"
Service method="(GET|HEAD)" type="magnus-internal/directory" fn="index-common"
Service method="(GET|HEAD|POST)" type="*~magnus-internal/*" fn="send-file"
Error fn="error-j2ee"
AddLog fn="flex-log" name="access"
</Object>
<Object name="j2ee">
ObjectType fn="force-type" type="text/html"
Service fn="service-j2ee" method="*"
</Object>
<Object name="cgi">
ObjectType fn="force-type" type="magnus-internal/cgi"
Service fn="send-cgi"
</Object>
<Object name="es-internal">
PathCheck fn="check-acl" acl="es-internal"
</Object>
or
2. adding the following code into generated.server1.acl and genwork.server1.acl
deny absolute (http_trace, http_put, http_delete, http_move, http_mkdir, http_rmdir) user="anyone";
which I get 200 OK
My generated.server1.acl file:
version 3.0;
acl "default";
authenticate (user, group) {
prompt = "Sun ONE Application Server";
deny absolute (http_trace, http_put, http_delete, http_move, http_mkdir, http_rmdir) user="anyone";
acl "es-internal";
deny absolute (http_trace, http_put, http_delete, http_move, http_mkdir, http_rmdir) user="anyone";
and genwork.server1.acl file:
version 3.0;
acl "default";
authenticate (user, group) {
prompt = "Sun ONE Application Server";
deny absolute (http_trace, http_put, http_delete, http_move, http_mkdir, http_rmdir) user="anyone";
acl "es-internal";
deny absolute (http_trace, http_put, http_delete, http_move, http_mkdir, http_rmdir) user="anyone";
Both methods of disabling HTTP TRACE seems not working......... Could anyone point where had went wrong?
Thank you
Edited by: draggy on Jan 5, 2009 8:28 AM

Hello Joe,
Thank you for replying.
However I did recheck everything
here my /server1/config/obj.conf:
# Use only forward slashes in pathnames--backslashes can cause
# problems. See the documentation for more information.
<Object name="default">
<Client method="TRACE">
AuthTrans fn="set-variable" remove-headers="transfer-encoding" set-headers="content-length: -1" error="501"
</Client>
AuthTrans fn="match-browser" browser="*MSIE*" ssl-unclean-shutdown="true"
NameTrans fn="ntrans-j2ee" name="j2ee"
NameTrans fn=pfx2dir from=/mc-icons dir="D:/Sun/AppServer7/lib/icons" name="es-internal"
NameTrans fn=document-root root="$docroot"
PathCheck fn=nt-uri-clean
PathCheck fn="check-acl" acl="default"
PathCheck fn=find-pathinfo
PathCheck fn=find-index index-names="index.html,home.html"
ObjectType fn=type-by-extension
ObjectType fn=force-type type=text/plain
Service method=(GET|HEAD) type=magnus-internal/imagemap fn=imagemap
Service method=(GET|HEAD) type=magnus-internal/directory fn=index-common
Service method=(GET|HEAD|POST) type=*~magnus-internal/* fn=send-file
Error fn="error-j2ee"
AddLog fn=flex-log name="access"
</Object>
<Object name="j2ee">
ObjectType fn=force-type type=text/html
Service fn="service-j2ee" method="*"
</Object>
<Object name="cgi">
ObjectType fn=force-type type=magnus-internal/cgi
Service fn=send-cgi
</Object>
<Object name="es-internal">
PathCheck fn="check-acl" acl="es-internal"
</Object>and my /server1/config/server1-obj.conf:
# Use only forward slashes in pathnames--backslashes can cause
# problems. See the documentation for more information.
<Object name="default">
<Client method="TRACE">
AuthTrans fn="set-variable" remove-headers="transfer-encoding" set-headers="content-length: -1" error="501"
</Client>
AuthTrans fn="match-browser" browser="*MSIE*" ssl-unclean-shutdown="true"
NameTrans fn="ntrans-j2ee" name="j2ee"
NameTrans fn=pfx2dir from=/mc-icons dir="D:/Sun/AppServer7/lib/icons" name="es-internal"
NameTrans fn=document-root root="$docroot"
PathCheck fn=nt-uri-clean
PathCheck fn="check-acl" acl="default"
PathCheck fn=find-pathinfo
PathCheck fn=find-index index-names="index.html,home.html"
ObjectType fn=type-by-extension
ObjectType fn=force-type type=text/plain
Service method=(GET|HEAD) type=magnus-internal/imagemap fn=imagemap
Service method=(GET|HEAD) type=magnus-internal/directory fn=index-common
Service method=(GET|HEAD|POST) type=*~magnus-internal/* fn=send-file
Error fn="error-j2ee"
AddLog fn=flex-log name="access"
</Object>
<Object name="j2ee">
ObjectType fn=force-type type=text/html
Service fn="service-j2ee" method="*"
</Object>
<Object name="cgi">
ObjectType fn=force-type type=magnus-internal/cgi
Service fn=send-cgi
</Object>
<Object name="es-internal">
PathCheck fn="check-acl" acl="es-internal"
</Object>I still getting the same 413...
$ telnet localhost 81
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
TRACE / HTTP/1.1
HOST: foo
HTTP/1.1 413 Request Entity Too Large
Server: Sun-ONE-Application-Server/7.0.0_01
Date: Tue, 06 Jan 2009 06:32:29 GMT
Content-length: 168
Content-type: text/html
Connection: close
<HTML><HEAD><TITLE>Request Entity Too Large</TITLE></HEAD>
<BODY><H1>Request Entity Too Large</H1>
A request entity is longer than the server can handle.
</BODY></HTML>Connection closed by foreign host.Thank you

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