Re: Need help with debugging Apache on Debian 10.2
The PHP issues were primarily involved with Wordpress plugins. I had to go through and find several that were not compatible with PHP 7. I _think_ I found and fixed all of those, but it’s certainly possible that the issue might be caused by a bad plugin. But I don’t know for sure. I’ve tried digging through Apache’s error.log and have not found any more obvious error messages to point me at things that need fixing. I’ve tried uninstalling and reinstalling PHP, on the theory that I may have confused it by making the jump not only through multiple versions of Debian, but also multiple versions of PHP. And yes, I have the PHP mod active in Apache. Re: getting a core dump… that’s the part I need help with. I did get the debugger installed but I am not experienced with how to use it in a way that’d let me actually get useful data. The big blocking problem would seem to be that I don’t actually know what’s causing the problem, so I can’t trigger it on purpose. So it would seem that I’d need to run Apache with the debugger somehow in the hope that I’d actually catch the problem when it happens? But I don’t know how to do that either. > On Jan 17, 2020, at 9:12 PM, wrote: > > I'd look first into that PHP part (I'm assuming you're running > mod_php, so it's in the Apache binary, and a crash in PHP would > crash the server, too). > > Which kind of problems did you have with PHP? > > Any possibility of getting a core dump you can look into with > the debugger? > > (Sorry for not looking at your web site -- bad connectivity > at the moment), > > Cheers > -- tomás
Re: Need help with debugging Apache on Debian 10.2
On Fri, Jan 17, 2020 at 08:38:18PM -0800, Angela Korra'ti wrote: > Yes we did, we did the upgrade in two distinct stages. > We did run into roadblocks as we went, but those were > mostly around PHP incompatibilities that we had to > address to bring our sites back up. I'd look first into that PHP part (I'm assuming you're running mod_php, so it's in the Apache binary, and a crash in PHP would crash the server, too). Which kind of problems did you have with PHP? Any possibility of getting a core dump you can look into with the debugger? (Sorry for not looking at your web site -- bad connectivity at the moment), Cheers -- tomás signature.asc Description: Digital signature
Re: Need help with debugging Apache on Debian 10.2
P.S. Confirmed that systemctl reload apache2.service throws no errors. > On Jan 17, 2020, at 8:38 PM, Angela Korra'ti > wrote: > > Yes we did, we did the upgrade in two distinct stages. We did run into > roadblocks as we went, but those were mostly around PHP incompatibilities > that we had to address to bring our sites back up. > > I’m _pretty_ sure we don’t have any config incompatibilities in Apache… > because yeah, Apache does in fact run. But I’ll doublecheck if the reload > command you’re asking about throws any actual errors. > > And perhaps a config inspection of our Apache install is called for. We’ve > got not only the main config file, but several supplementary ones for the > various domains we host as well. > >> On Jan 17, 2020, at 4:43 PM, Dan Ritter wrote: >> >> Did you upgrade to 9 in between? >> >> 8 had apache 2.2, and a bunch of config things changed from 2.2 >> to 2.4. That usually shows up in apache failing to start, >> though. >> >> Does >> >> systemctl reload apache2.service >> >> cause an error? >> >> Worst case: if things are massively unstable, you might copy all the >> data off elsewhere, re-install Debian 10 from scratch, and then bring >> the data back in. >> >> -dsr- >> >> >> -- >> https://randomstring.org/~dsr/eula.html is hereby incorporated by reference. >> there is no justice, there is just us. >
Re: Need help with debugging Apache on Debian 10.2
Yes we did, we did the upgrade in two distinct stages. We did run into roadblocks as we went, but those were mostly around PHP incompatibilities that we had to address to bring our sites back up. I’m _pretty_ sure we don’t have any config incompatibilities in Apache… because yeah, Apache does in fact run. But I’ll doublecheck if the reload command you’re asking about throws any actual errors. And perhaps a config inspection of our Apache install is called for. We’ve got not only the main config file, but several supplementary ones for the various domains we host as well. > On Jan 17, 2020, at 4:43 PM, Dan Ritter wrote: > > Did you upgrade to 9 in between? > > 8 had apache 2.2, and a bunch of config things changed from 2.2 > to 2.4. That usually shows up in apache failing to start, > though. > > Does > > systemctl reload apache2.service > > cause an error? > > Worst case: if things are massively unstable, you might copy all the > data off elsewhere, re-install Debian 10 from scratch, and then bring > the data back in. > > -dsr- > > > -- > https://randomstring.org/~dsr/eula.html is hereby incorporated by reference. >there is no justice, there is just us.
Re: Need help with debugging Apache on Debian 10.2
Angela Korra???ti wrote: > However, as of when we updated to Debian 10.2, we started having recurring > issues with Apache throwing segmentation faults that resulted in all > PHP-based sites (notably, the Wordpress ones) throwing 503 errors from > varnish. > > https://angelahighland.info/2020/01/12/need-help-with-debian-web-server-debugging/ > > To what I wrote in that post, I can add that we???ve also kept the server up > to date with security and other updates, and it???s been rebooted a couple of > times since the big upgrade to Debian 10. (We were previously on version 8.) Did you upgrade to 9 in between? 8 had apache 2.2, and a bunch of config things changed from 2.2 to 2.4. That usually shows up in apache failing to start, though. Does systemctl reload apache2.service cause an error? Worst case: if things are massively unstable, you might copy all the data off elsewhere, re-install Debian 10 from scratch, and then bring the data back in. -dsr- -- https://randomstring.org/~dsr/eula.html is hereby incorporated by reference. there is no justice, there is just us.
Need help with debugging Apache on Debian 10.2
Hi Debian users list, My name is Angela and I run Debian 10.2 on my home web server. On that server, my wife and I are hosting several Wordpress sites as well as a small number of non-Wordpress ones. However, as of when we updated to Debian 10.2, we started having recurring issues with Apache throwing segmentation faults that resulted in all PHP-based sites (notably, the Wordpress ones) throwing 503 errors from varnish. And I am at my wit’s end as to how to fix this problem, because I do not have enough debugging experience with a Linux environment to know how to proceed. I have written up the problem in detail here: https://angelahighland.info/2020/01/12/need-help-with-debian-web-server-debugging/ That post (which is external to my home web server, since my home web server is unstable) includes: * Behavior observed when the seg fault occurs * What I’ve done to try to fix the problem so far * Details on what we have installed on the system at this time To what I wrote in that post, I can add that we’ve also kept the server up to date with security and other updates, and it’s been rebooted a couple of times since the big upgrade to Debian 10. (We were previously on version 8.) Can anyone advise on best steps to get enough information to diagnose the problem? As I said in my post, I do have gdb and the Apache debug symbols package installed, but I don’t have experience with them so I don’t know how to effectively _use_ them. Many thanks in advance to anyone who can assist! Angela Sent from my iPad
