Questions tagged [debugging]

Question 1

assuming a modern linux host, is there any convenient way to spawn an interactive shell in the exact context systemd would use for a unit/service? alternatively, any way to attach a shell to a running ...

Question 2

I got a problem with my wildfly server. I a trying to print logs, but they are not showing whatever changes to wildfly log configurations I am making. Here is the code with the initial class that runs,...

Question 3

I have an Apache server (version 2.4.62-1~deb12u2 from Debian 12 “Bookworm”, currently the stable version of Debian) serving a site http://www.example.tld/ with UserDir activated, so http://www....

Question 4

My gpupdate can take upto 10 minutes to run instead of 40s. How can I debug gpupdate ? : PS C:\> ~/psh/time.ps1 gpupdate Updating policy... Computer Policy update has completed successfully. User ...

Question 5

I had set up a mail server in my Rocky Linux 9.1 that comes with postfix, dovecot and mysql (refer to https://computingforgeeks.com/how-to-setup-mail-server-on-centos/). Every thing is updated. (...

Question 6

I'm at the end of my patience with a prometheus setup leveraging kube-prometheus-stack 44.3.0 (latest being 45). I have two environments, staging and prod. In staging, my prometheus runs smoothly. In ...

Question 7

A client of mine is trying to connect to our site via CURL. The command they are running is: curl -Ik example.com The response they receive is: (56) Recv failure: Connection reset by peer site They ...

Question 8

I'm getting mad with what should be a simple task: a java process is running, runs out of memory and a script runs. SELinux is disabled. in setenv.sh : -XX:OnOutOfMemoryError='/opt/alfresco/scripts/...

Question 9

I'm new to Ansible, and yes I know this has already been asked many times, but I already tried to apply advice I saw elsewhere. I did export ANSIBLE_STDOUT_CALLBACK=debug and then ansible-playbook -...

Question 10

We are getting [Wed Aug 25 15:06:05.484053 2021] [proxy_fcgi:error] [pid 24792:tid 140550620227328] [client xxxx:40224] Premature end of script headers: index.php, referer: https://www.example.com/ [...

Question 11

I am running an nginx + php-fpm setup. I recently ran into problem returning binary data to the Nginx server. Nginx show this in the error log: 2021/08/04 19:22:27 [error] 996463#996463: *1 upstream ...

Question 12

The following is done on a Ubuntu 20.04 system. This is the scenario where I am facing an issue: I edit the password aging settings in the login.defs file Then I change the password of the user with ...

Question 13

I get a internal server error after adding redirects to .htaccess - I've added 600 of them. I check /var/logs/error.log [Wed May 12 16:26:02.600394 2021] [core:alert] [pid 8071] [client 127.127.127....

Question 14

Can someone explain what it means when I see Accept-Encoding: gzip,deflate when listening with ncat? Does it mean the body is compressed? And if so, how can I decompress it? $ nc -lnvp 4000 Ncat: ...

Question 15

I've installed LeanSentry on one of my web servers to try and diagnose some performance issues I've been having. I need to install Windows Debugging Tools (from the Windows SDK) to get some memory ...

Question 16

I’m using the tips on this SO thread. ps -awux|grep df root 15826 0.0 0.0 0 0 ? I< May22 0:00 [cifs-dfscache] myuser 3086246 0.0 0.0 216860 3212 ? Ss 16:06 ...

Question 17

I have a web site, that is visited by many different mobile devices and embedded devices. Quite often I encounter the issue, that some devices cannot connect. The reasons can be: the device doesn't ...

Question 18

I have a single-board computer, I want to knows whats going on when it boot up and start up because i never get access to its BIOS, can I log the events/activities happening on the board when it get ...

Question 19

I am trying to configure dhcp PXE server, but client is not booting as expected. Is there a way how you can watch transferred requested and responded options between client and server? I want to be ...

Question 20

I'm using Ubuntu 18.04 Server with systemd. Recently a program my department has developed crashed twice within a day with the following error: Jun 07 06:33:07 xxx systemd[1]: xxx.service: Main ...

Question 21

Given you have a libvirt guest VM which has all possible startup logs verbosely enabled (kernel loglevel, syslogd, dmesg etc. depending on distro). How to extract these startup logs to the host ...

Question 22

My ubuntu system hangs on the startup. It hangs on [OK] items like usual on boot. Interestingly, I am able to ssh onto this machine, but the boot never finishes and login screen doesn't appear. What ...

Question 23

I have an error in my asp.net core 2.1 app and would like to set the ASPNETCORE_ENVIRONMENT setting to Development so that I can better debug. There are samples for the appsettings.json file, but the ...

Question 24

The Azure App service UI used to have an ability to inspect 5xx errors directly. Since we starting using Azure, the UI has been changing almost constantly though, and this ability seems to have ...

Question 25

Without having to manually trace dependencies, e.g. with systemctl show or systemctl cat, and manually inspect the state of the system with systemctl status and systemctl list-units, is there a way to ...

Question 26

I'm running a Linux workstation without swap and I have installed earlyoom daemon to automatically kill some processes if I'm running out of RAM. The earlyoom works by monitoring kernel MemAvailable ...

Question 27

Could please someone explain how Spamassassin build the following strings: Oct 17 14:00:30 server amavis[29497]: (29497-02) SA dbg: uridnsbl: domain amazonaws.com in skip list, host sns.eu-central-1....

Question 28

I see an anonymous process changing the time of my systemtime to UTC every 80 sec. Using the journalctl -f command I only see a message that says 'systemd[1]: time has been changed' but it doesn't ...

Question 29

I am experiencing weird 100% spikes of cpu when loading drupal pages. It started several months ago and now Im trying to debug this. I moved same database and files to new hosting - everything runs ...

Question 30

I'm dealing with some strange problem for some time now: After some days of runtime, one of my VMs seems to become slower on CPU-heavy tasks. One example were this happens is reading virus signature ...

Question 31

I'm experiencing network timeouts when trying to fetch libraries from https://rubygems.org and I'd like to figure out why. It only seems to affect requests made from my home network. If I take my ...

Question 32

To make a long story short, I have two identical servers hosting VMs using VirtualBox and both servers host one VM each nearly setup the same way, only that one is production and the other for ...

Question 33

I'm on an amzn-linux instance which by default runs linux-4.9. I've compiled and booted linux-4.14.14 from source and I've compiled systemtap from source. Now I'd like to get them both working nicely ...

Question 34

Currently NTP is rejecting its upstream and is drifting quite badly (15 seconds of offset so far and growing). When checking the reason using ntpq the flash code is flash=400 peer_dist. Checking the ...

Question 35

If I was to debug a service on a machine and I determined that a write was failing, how could I check why the write failed? I know the system call in C will return -1 and then we can check what ...

Question 36

We are experiencing high load on our dedicated servers lately. Users see the error message "can not connect right now. can not assign requested address" popping up randomly. We have 2 Linux ...

Question 37

I have a (node.js) application which is occasionally causing 100% CPU usage. I've attached to the process with strace when it's been in this state - but I don't know what to make if the strace output....

Question 38

The current search results for "debug dns" don't reveal a guide-line what to do, if you (as user/client) think there is something wrong with the host name resolution. What steps can I do to narrow ...

Question 39

Info I'm developing a web application in ASP.NET MVC. It works great running locally (or even on a test server on my network). The moment I push it up to Azure, a couple of the redirects break ...

Question 40

I have an issue with custom script using exec plugin. From shell the script works well and nothing useful in /var/log/collectd.log. LoadPlugin logfile <Plugin logfile> LogLevel info ...

Question 41

We're running a web service and hitting 502 Bad Gateway randomly. The 502 is reported by reverse proxy (Apache 2.4.x) while talking to backend server (Apache 2.4.x). The problem randomly re-appears ...

Question 42

I have Intel's P3700 SSD mounted on a Lenovo x3650 M5 server with two Intel Xeon E5-2630 v3 CPUs. The server is running Ubuntu 14.04 with 4.6.4 Kernel. I've been using fio to benchmark the SSD using ...

Question 43

This Apache/MySQL server (Debian 8) running a Drupal site shows a strange behaviour: There's always one Apache process running with 100% CPU utilization (according to htop). Every four minutes (~240 ...

Question 44

(Not sure if this is an IIS problem or not, so if this is better suited for SO I'll happily move it...) We have an IIS-hosted application that is sporadically dying, and the event logs claim that the ...

Question 45

My Uni provided me two hostnames and static IPs for two interfaces on my Fedora Server 23. My idea is to use one hostname for production and another for dev branches. It should work as: bio-db.uni.edu ...

Question 46

How can I see the TLS (SSL) certificates that my RADIUS server is using, to make sure it is sending the correct certificate and chain? I am implementing 802.1x authentication with a RADIUS server, ...

Question 47

Using the command below, I can log all actions that happened inside that script. bash -x script.sh Sadly, the script calls another script, which does not have the -x setting active then, i.e. the ...

Question 48

We have an Elasticsearch cluster hosted on Amazon Elasticsearch Service (AWS). We are using the Jest Java HTTP Rest client for ElasticSearch. Every now and then (perhaps 1 in 10,000 requests), it ...

Question 49

I'd like to have access to the lines/tracebacks/whatever whispered by the kernel right before dying. This has proven problematic, because all interfaces I have access to become disabled. Post-reboot, ...

Question 50

I have any very long sql query in postgresql. I tried show what postgress do with: select * from pg_stat_activity unfortunately I see something like: select some_fields from anytable1 anytable2 ...