This question is about Apache crashing repeatedly, and while it runs, it's unresponsive, i.e. I can't reach the site, so I'm trying to figure out the reason why.
My Owncloud site served by Apache 2.4.7 on Ubuntu 14.04 is not reachable. To check what's wrong, I ran apachectl -S:
~$ sudo apachectl -S AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message VirtualHost configuration: *:443 oc.benopp.org (/etc/apache2/sites-enabled/000-default.conf:1) *:80 127.0.1.1 (/etc/apache2/sites-enabled/000-default.conf:18) ServerRoot: "/etc/apache2" Main DocumentRoot: "/var/www" Main ErrorLog: "/var/log/apache2/error.log" Mutex mpm-accept: using_defaults Mutex watchdog-callback: using_defaults Mutex rewrite-map: using_defaults Mutex ssl-stapling: using_defaults Mutex ssl-cache: using_defaults Mutex default: dir="/var/lock/apache2" mechanism=fcntl PidFile: "/var/run/apache2/apache2.pid" Define: DUMP_VHOSTS Define: DUMP_RUN_CFG User: name="www-data" id=33 Group: name="www-data" id=33 This doesn't seem to explain the problem though. The error.log says this:
[Wed Jan 07 19:07:13.384687 2015] [ssl:warn] [pid 1699] AH01906: RSA server certificate is a CA certificate (BasicConstraints: CA == TRUE !?) [Wed Jan 07 19:07:13.389319 2015] [mpm_prefork:notice] [pid 1699] AH00163: Apache/2.4.7 (Ubuntu) mod_gnutls/0.5.10 PHP/5.5.9-1ubuntu4.5 OpenSSL/1.0.1f configured -- resuming normal operations [Wed Jan 07 19:07:13.389359 2015] [core:notice] [pid 1699] AH00094: Command line: '/usr/sbin/apache2' [Wed Jan 07 19:08:01.788631 2015] [mpm_prefork:error] [pid 1699] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting I don't understand how the Max requests settings can be reached with only me using the site. Am I right in assuming that while I'm the only one trying to access Owncloud to download some files or change settings, that should never cause this amount of requests?
To take a closer look, I activated mod_status. Unfortunately I don't know what to make of the readout, because I only taught myself how to setup Apache to run my Owncloud, and I'm new to this. It seems a bit long to post the server-status page readout here inline, so I made a paste: http://pastie.org/private/aj7zduzhrt8sayjb4hncg
So, all the processes are "sending reply", except I don't know to what, because I'm not sending any requests, and the server is actually disconnected from the internet right now. In the documentation it is explained how to look for problems that are causing excessive workloads, but I'm having trouble getting Top to show me something I can use. It does seem though that CPU-load really isn't it, there are no high loads to be seen. Can you tell what the problem is from this readout?
EDIT2: another crash happened a few hours ago, here's a part that seems relevant from the error.log:
beginning of file:
ProblemType: Crash Architecture: amd64 CrashCounter: 1 Date: Tue Jan 6 13:50:05 2015 DistroRelease: Ubuntu 14.04 ExecutablePath: /usr/sbin/apache2 ExecutableTimestamp: 1406039884 ProcCmdline: /usr/sbin/apache2 -k start ProcCwd: /etc/apache2 ProcEnviron: PATH=(custom, no user) LANG=C ProcMaps: 7fd2a4000000-7fd2a8000000 rw-s 00000000 00:04 12964 /dev/zero (deleted) 7fd2a8000000-7fd2a8021000 rw-p 00000000 00:00 0 7fd2a8021000-7fd2ac000000 ---p 00000000 00:00 0 7fd2aced8000-7fd2acedd000 r-xp 00000000 08:01 266060 /lib/x86_64-linux-gnu/libnss_dns-2.19.so 7fd2acedd000-7fd2ad0dc000 ---p 00005000 08:01 266060 /lib/x86_64-linux-gnu/libnss_dns-2.19.so 7fd2ad0dc000-7fd2ad0dd000 r--p 00004000 08:01 266060 /lib/x86_64-linux-gnu/libnss_dns-2.19.so and so on and so on, until end of file:
ProcStatus: Name: apache2 State: R (running) Tgid: 2807 Ngid: 0 Pid: 2807 PPid: 1838 TracerPid: 0 Uid: 33 33 33 33 Gid: 33 33 33 33 FDSize: 64 Groups: 33 VmPeak: 525052 kB VmSize: 524944 kB VmLck: 0 kB VmPin: 0 kB VmHWM: 23680 kB VmRSS: 23680 kB VmData: 85112 kB VmStk: 136 kB VmExe: 592 kB VmLib: 74868 kB VmPTE: 712 kB VmSwap: 0 kB Threads: 1 SigQ: 1/29106 SigPnd: 0000000000000000 ShdPnd: 0000000000000000 SigBlk: 0000000000004000 SigIgn: 0000000001001000 SigCgt: 000000018c0042eb CapInh: 0000000000000000 CapPrm: 0000000000000000 CapEff: 0000000000000000 CapBnd: 0000001fffffffff Seccomp: 0 Cpus_allowed: 3 Cpus_allowed_list: 0-1 Mems_allowed: 00000000,00000001 Mems_allowed_list: 0 voluntary_ctxt_switches: 21 nonvoluntary_ctxt_switches: 34 Signal: 11 Uname: Linux 3.13.0-43-generic x86_64 UserGroups: CoreDump: base64 then the CoreDump I deleted.
