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 Topic: Slow reload/restart/-S on some servers |
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randomwhitetrash
Joined: 11 Apr 2017
Posts: 1
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 Posted: Tue 11 Apr '17 8:30 Post subject: Slow reload/restart/-S on some servers |
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Hi,
I need help with debugging a problem that happens on 2 out of our 4 servers. We run Apache 2.4.7 on Ubuntu 14.04.
Each server host multiple sites, all with SSL - mostly same certificate but there are also custom certificates for some of t he sites. Now, the problem is it takes about 40 seconds to reload Apache configuration. On 2 of the servers. Used to happen on 3 of them but then suddenly for no reason I can pinpoint one of the servers (and actually one that has most conf files usually about 300) started working as expected - reloading config takes 2-3 sec now.
4th server never had any problems and even if I load it with 100 conf files it still works fine.
How do I debug what takes Apache so long to process? What I see is just nothing and then after 40 sec it says [OK] or shows me list of hosts if I use -S option.
I tried comparing configs, all look the same. Removed some of the certificates/sites and on 2 affected servers time just decreases more or less proportionally.
One more thing to mention is that when I do reload and it takes 40 sec, if I would to do same thing again right after it take 1 sec to reload. Then if I wait a minute or so I am back to circa 40 sec.
Error logs contain nothing of use:
OK server:
[Tue Apr 11 06:23:32.814032 2017] [mpm_prefork:notice] [pid 11404] AH00173: SIGHUP received. Attempting to restart
[Tue Apr 11 06:23:34.793241 2017] [ssl:warn] [pid 11404] AH02292: Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
[Tue Apr 11 06:23:34.798864 2017] [mpm_prefork:notice] [pid 11404] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.21 OpenSSL/1.0.1f configured -- resuming normal operations
[Tue Apr 11 06:23:34.798896 2017] [core:notice] [pid 11404] AH00094: Command line: '/usr/sbin/apache2'
Slow server (notice timestamps):
[Mon Apr 10 14:52:41.645822 2017] [mpm_prefork:notice] [pid 9248] AH00173: SIGHUP received. Attempting to restart
[Mon Apr 10 14:53:27.413158 2017] [ssl:warn] [pid 9248] AH02292: Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
[Mon Apr 10 14:53:27.418266 2017] [mpm_prefork:notice] [pid 9248] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.21 OpenSSL/1.0.1f configured -- resuming normal operations
[Mon Apr 10 14:53:27.418313 2017] [core:notice] [pid 9248] AH00094: Command line: '/usr/sbin/apache2'
How to find the cause of this?
P.S. -e debug or -e info does not how anything useful either... |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7381
Location: Germany, Next to Hamburg
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| Posted: Sun 14 May '17 12:41 Post subject: |
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How is the load on that server?
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mario@mr-burns:~
λ w
12:41:39 up 6 days, 13:18, 1 user, load average: 0.07, 0.03, 0.00
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
mario pts/0 ip5f5be5ce.dynam 12:41 3.00s 0.00s 0.00s w
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