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0
votes
0answers
9 views

Ctrl-C is ignored by pppd when put in a shell script

I'm trying to connect to GPRS network through a serial port connected GSM modem. When I call /usr/sbin/pppd call <peer_name> from the command line, It correctly receives and handles Ctrl+C from ...
1
vote
0answers
51 views

Wifi between Buildings 385ft Apart [closed]

I administer a network where they've built a new building on the property that is 385ft from the main building. The ground between the buildings is completely paved and the owner wants to avoid a ...
0
votes
1answer
51 views

Logging violations of rules in limits.conf

I am trying to log the details of the programs that where failed due to the limit cap defined in the limits.conf. My initial plan was to do it using the audit system. The idea was to track the system ...
12
votes
2answers
841 views

Wireless link frequency choice (900Mhz vs 5.8Ghz) for 2-3km distance

I have recently been contracted by a client of mine to facilitate the wireless communication of his "home" offices and a secondary site. The primary site is the top two floors of a 5-story office ...
0
votes
3answers
207 views

patch panels… or directly to the switch?

does it make a difference in terms of signal quality if I connect the Ethernet cabling: from the wall-plugs to the patch-panel and from the patch-panel to the switch with a cord. as opposed to: ...
8
votes
2answers
2k views

Industry standard for minimum Wifi signal strength?

Is there an industry standard for how strong a Wifi signal needs to be in order to have a reliable connection? For example, maybe Wifi endpoints are designed to the specification that they connect ...
-2
votes
1answer
169 views

How to mask out wireless by blocking a neighboring WiFi Access Point [closed]

I surely hope this question is not a duplicate of another; I had difficulty finding a cut and dry solution for this on my own, so I thought I might have some luck sharing it with the Hive Mind of ...
1
vote
2answers
406 views

kill -HUP is not working with celery daemon

So I have a shell script that daemonizes celery, and creates a bunch of workers running as a daemon. I would like to have a way to restart the celery task when the underlying source gets changed since ...
-1
votes
1answer
53 views

Wifi Signal Strengths [closed]

I hope that I have asked this question in the right topic. Basically I use BT (In the U.K.) and I have problems with my router receiving a weak signal in certain rooms of the house, which, therefore ...
5
votes
1answer
137 views

Is it generally safe to use SIGCONT on processes?

I have a many daemon processes that sometimes get hung up during a db transaction, thus blocking other queries ( and causing general havoc ) In order to debug, I've added some code in the daemon ...
3
votes
3answers
977 views

What does the Ubiquiti Bullet do?

I was briefly shown the networking setup for a rural hospital campus. Some of the things I was told or shown are: There is an 802.11b signal, broadcast over an omnidirectional antenna on a tower. ...
1
vote
0answers
118 views

Unexpected jBoss crash and auditing signals

We're experiencing unexpected JBoss crashes on a semi-regular basis. JBoss 5 is running on RHEL6 in this case. I believe this is related to a sigusr1 sent to the JBoss process. The JBoss server logs ...
2
votes
2answers
213 views

Modifiying parameters in postgresql.conf and SIGHUP

I modified the parameter maintenance_work_mem in postgresql.conf in my production environment. I'd like to know if I send a SIGHUP to the postgres process it will reload that variable, and if it's ...
2
votes
1answer
205 views

transparent signals over ssh

By transparently I mean forwarding of: stdin, stdout and stderr standard signals (SIGHUP or SIGINT would be great for a start) As an example, consider these invocations of a (pointless) local and ...
0
votes
2answers
765 views

Unicorn retains same PID when receives USR2?

So, I've been playing with a unicorn deployment on my personal server. There are a variety of reasons behind this - one of them being that I didn't particularly want to have to compile my own version ...
0
votes
2answers
1k views

Process that sent SIGKILL

I have a series of scripts that are being killed ($? says exit code is 137, which implies a kill -9 scenario). I need to know what process killed them. Is there a way to find out this information?
10
votes
4answers
5k views

I get Killed by signal 15. when I'm using svn

I'm using svn+ssh and I see a number of: Killed by signal 15. during a svn up. Any ideas way?
12
votes
3answers
4k views

Do background processes get a SIGHUP when logging off?

This is a followup to this question. I've run some more tests; looks like it really doesn't matter if this is done at the physical console or via SSH, neither does this happen only with SCP; I also ...
4
votes
2answers
2k views

How to find out the source of a POSIX signal

Is there a way to find out the origin of a signal sent in Red Hat Enterprise Linux 5 (SIGTERM etc.)? I'm regularly trapping a TERM in an application and I have no idea where it is coming from.
3
votes
7answers
614 views

Wireless network signal strength troubleshooting… where to start?

Here is the information displayed by the wireless router (see end of post). The problem is that my netbook does not get any signals from the router if moved more than 3 feet (yup, three feet) away ...
0
votes
2answers
594 views

PostgreSQL processes and the signals to which they respond

For PostgreSQL 8.3 and later, what are the processes that make up the server and that respond to a query? What signals do the various processes respond to and what effect do the signals have? What ...
0
votes
2answers
204 views

How can I use symbolic signals in an at job?

In this answer on SO, I gave an example that should have used a -SIGCONT signal in a job submitted to at. However, I found that the process that I had stopped with -SIGSTOP did not continue. When I ...