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Question

wordpress nginx site very slow -- php error -- cpu high

  • Posted August 15, 2014

Few hours ago I got a serious performance problem on my company droplet and i can’t figure out what’s the cause. this is how bad it looks: http://i62.tinypic.com/bkex1.jpg

Both websites are displaying this message: “The page you are looking for is temporarily unavailable. Please try again later.”

I tried everything. I tried to deactivated al the plugins for the 2 websites we have (miasa.de and pro.miasa.de), but the CPU was still over 50%. I also updated all the plugins and Wordpress version, but everything still rocketing over 90%

The issue happened few ours after i was trying to install a SSL using this tutorial: https://www.digitalocean.com/community/tutorials/how-to-create-a-ssl-certificate-on-nginx-for-ubuntu-12-04 Although, I didn’t finish all the process. I have stopped on step five – I didn’t set up the virtual hosts.

I hope you guys can help me through here.

This are the log files i got today from the var/log/nginx: https://drive.google.com/file/d/0B5PDpzeSyKU5bDB1RFVfYm5uT2M/edit?usp=sharing

on the error log what we see is a repetition of this message:

2014/08/15 11:41:51 [error] 18206#0: *5395 connect() to unix:/var/run/php5-fpm.sock failed (11: Resource temporarily unavailable) while connecting to upstream, client: 41.142.99.109, server: miasa.de, request: "POST /xmlrpc.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "miasa.de"

I thank you for your time!

(i also have opened a ticket because the situation is quite urgent – i will update both sides with the responses i might get. )

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vbraniste • August 16, 2014

Hi,

From my experience - it looks like you`re under attack to /xmlrpc.php (pingback/trackback spam), every access to this file have high CPU consumption . You can easily check this by renaming this file from domain root or limiting access to this file.

regards, VB

Tiago Mia • August 16, 2014

This fixed my problem: http://stackoverflow.com/questions/23443398/nginx-error-connect-to-php5-fpm-sock-failed-13-permission-denied

Tiago Mia • August 15, 2014

trying to check what is going with nginx i did:

  1. i clean archived the old log files on my decktop

  2. sudo nginx -s quit

  3. then: sudo service nginx restart

  4. then i got this new log: https://drive.google.com/file/d/0B5PDpzeSyKU5RWhsa3JUMHNRSWM/edit?usp=sharing

Tiago Mia • August 15, 2014

now i just tried to reinstal and reastart the php and nginx following the step five here.

and now i don’t see the php on the top. it looks like this:

top - 12:39:27 up 135 days, 1:57, 2 users, load average: 0.35, 1.31, 5.09 
Tasks: 88 total, 2 running, 86 sleeping, 0 stopped, 0 zombie 
Cpu(s): 26.3%us, 69.7%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.3%si, 3.7%st 
Mem: 1018820k total, 313308k used, 705512k free, 16328k buffers 
Swap: 262140k total, 132540k used, 129600k free, 163852k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 
22581 root 20 0 15888 1992 868 S 1.0 0.2 0:00.23 find 
10 root 20 0 0 0 0 S 0.3 0.0 24:31.83 rcu_sched 
24067 root 20 0 7180 776 656 R 0.3 0.1 0:00.01 fuser 
1 root 20 0 24280 552 36 S 0.0 0.1 0:07.71 init 
2 root 20 0 0 0 0 S 0.0 0.0 0:01.32 kthreadd 
3 root 20 0 0 0 0 S 0.0 0.0 3:55.84 ksoftirqd/0 
5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H 
6 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kworker/u:0 
7 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/u:0H 
8 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0 
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh 
11 root RT 0 0 0 0 S 0.0 0.0 3:44.38 watchdog/0 
12 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 cpuset 
13 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 khelper 
14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kdevtmpfs

the sad news is that the website, back-end and front-end are still down with the same error: The page you are looking for is temporarily unavailable. Please try again later.

Tiago Mia • August 15, 2014

@gp+digitalocean it actually runs. i mean, when i deactivated the plugins, the site was slower than normal (cpu +/- on 60%), but it worked. do you know what should i do in this case?

this how the top looks like:

top - 12:16:24 up 135 days,  1:34,  2 users,  load average: 10.05, 10.10, 9.96
Tasks:  91 total,  12 running,  79 sleeping,   0 stopped,   0 zombie
Cpu(s): 93.7%us,  3.6%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  0.3%si,  2.3%st
Mem:   1018820k total,   933680k used,    85140k free,     6688k buffers
Swap:   262140k total,   151096k used,   111044k free,    24904k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                        
18231 www-data  20   0  342m  79m 3240 R 10.3  8.0   5:22.92 php5-fpm                                                                        
18239 www-data  20   0  342m  79m 3240 R 10.3  8.0   5:21.43 php5-fpm                                                                        
18237 www-data  20   0  351m  87m 3212 R 10.0  8.8   5:22.25 php5-fpm                                                                        
18229 www-data  20   0  342m  78m 3212 R  9.6  7.9   5:23.50 php5-fpm                                                                        
18230 www-data  20   0  336m  72m 3240 R  9.6  7.3   5:23.44 php5-fpm                                                                        
18232 www-data  20   0  345m  81m 3272 R  9.6  8.2   5:22.80 php5-fpm                                                                        
18235 www-data  20   0  351m  87m 3212 R  9.6  8.8   5:22.42 php5-fpm                                                                        
18236 www-data  20   0  342m  79m 3212 R  9.6  8.0   5:21.86 php5-fpm                                                                        
18238 www-data  20   0  342m  79m 3216 R  9.6  8.0   5:22.25 php5-fpm                                                                        
18240 www-data  20   0  342m  79m 3328 R  9.6  8.0   5:21.85 php5-fpm                                                                        
27171 mysql     20   0  867m  26m 2356 S  1.0  2.7 255:46.21 mysqld                                                                          
18205 www-data  20   0  176m 1760  448 S  0.3  0.2   0:02.70 nginx                                                                           
    1 root      20   0 24280  512    0 S  0.0  0.1   0:07.70 init                                                                            
    2 root      20   0     0    0    0 S  0.0  0.0   0:01.32 kthreadd                                                                        
    3 root      20   0     0    0    0 S  0.0  0.0   3:55.71 ksoftirqd/0
gparent • August 15, 2014

It looks like PHP isn’t running or nginx can’t connect to it.