Nginx PageSpeed PageSpeed Serf fetch failure rate extremely high

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• CentOS Version: CentOS 7 64bit
• Centmin Mod Version Installed: 123.09beta01
• Nginx Version Installed: Latest
• PHP Version Installed: Latest 7.1
• MariaDB MySQL Version Installed: Latest
• When was last time updated Centmin Mod code base ? : Yesterday

Custom config:

Code (Text):

NGINX_PAGESPEED='y'
NGXDYNAMIC_NGXPAGESPEED='y'
LETSENCRYPT_DETECT='y'
SECOND_IP=0.0.0.0.0
MARCH_TARGETNATIVE='n'
DISABLE_IPVSIX='y'

I'm seeing this in the nginx error log:

Code (Text):

Slow ReadFile operation on file /var/ngx_pagespeed_cache/v3/domain.com/https,3A/,2Fdomain.                com/forum/data/avatars/s/12/12577.jpg,3F1519161390,: 218.861ms; configure SlowFileLatencyUs to change threshold

2019/05/27 13:41:33 [error] 3190#3380: [ngx_pagespeed 1.13.35.2-0] PageSpeed Serf fetch failure rate extremely high; only 0 of 1737 recent fetches fully successful; is                 fetching working?
2019/05/27 14:11:35 [error] 3190#3380: [ngx_pagespeed 1.13.35.2-0] PageSpeed Serf fetch failure rate extremely high; only 0 of 1260 recent fetches fully successful; is                 fetching working?
2019/05/27 14:12:23 [alert] 3191#3191: *647106 open socket #14 left in connection 60
2019/05/27 14:12:23 [alert] 3191#3191: *654013 open socket #38 left in connection 61
2019/05/27 14:12:23 [alert] 3191#3191: aborting
2019/05/27 14:42:53 [error] 13120#13142: [ngx_pagespeed 1.13.35.2-0] PageSpeed Serf fetch failure rate extremely high; only 0 of 1273 recent fetches fully successful;                 is fetching working?
2019/05/27 14:47:55 [error] 13119#13145: [ngx_pagespeed 1.13.35.2-0] Slow ReadFile operation on file /var/ngx_pagespeed_cache/v3/domain.com/https,3A/,2Fdomain.com/forum/data/avatars/s/0/122.jpg,3F1397640560,: 72.242ms; configure SlowFileLatencyUs to change threshold

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I don't think I saw any of:

Code (Text):

    pagespeed SslCertDirectory /etc/pki/tls/certs;
    pagespeed SslCertFile /etc/pki/tls/cert.pem;

So I added it to the top with the rest right at the bottom.

I started seeing the below in the error log:

Code (Text):

2019/05/28 12:51:05 [alert] 13120#13120: *205057 open socket #28 left in connection 9
2019/05/28 12:51:05 [alert] 13120#13120: *203202 open socket #34 left in connection 33
2019/05/28 12:51:05 [alert] 13120#13120: *205058 open socket #29 left in connection 43
2019/05/28 12:51:05 [alert] 13120#13120: *203204 open socket #37 left in connection 54
2019/05/28 12:51:05 [alert] 13120#13120: aborting

This slowed down the whole site and I couldn't type anything via SSH terminal for like 30 seconds.

 

Also do I even need the non-HTTP line if I only use HTTPS?

Code (Text):

pagespeed LoadFromFile "http://community.centminmod.com" "/home/nginx/domains/community.centminmod.com/public";
pagespeed LoadFromFile "https://community.centminmod.com" "/home/nginx/domains/community.centminmod.com/public";

 

I brought it up with Linode before and they said it might be an internal config issue because of a 502 bad gateway error I mentioned with it. They also claimed to have looked for networking / connectivity issues but I don't think they found any.

Disabled pagespeed like you recommended above and the issue is still there although it seems like it's A LOT better than before (no more 30+ second pauses via SSH). It's more like a 3-8 second wait.

This started happening about 5-8 days ago (edit: I think? But it wasn't much days like a whole 30+ days).

I've searched the nginx, php fpm and mariadb error logs but nothing showed up besides what I've mentioned above.

 

The pauses are random (like one can happen in 2 mins then the other in maybe 15 mins) btw.

 

Pagespeed is disabled from command line and I just got a 502 bad gateway page from my browser.

 

Wouldn't there be any hints in an error log?

 

Code (Text):

pool:                 www
process manager:      ondemand
start time:           28/May/2019:14:36:43 +0000
start since:          925
accepted conn:        2200
listen queue:         0
max listen queue:     25
listen queue len:     511
idle processes:       17
active processes:     7
total processes:      24
max active processes: 39
max children reached: 0
slow requests:        0

This looks OK to me if idle processes is fine.
max active processes did not reach pm.max_children.

 

Not initial. That's fine. I kept the SSH session active and waited for my site to load slowly. I noticed when the site loads slowly, I'm unable to type anything in Putty. When the site was fine, I'd see some of what I typed in Putty. So it might just be lag when the site loads slowly.

Edit: IPv6 is disabled too and the IPv6 IPs from Linode's DNS manager are not there.

 

@eva2000 Issue was Linode again. I messaged them around when it first started happening and they said nothing was wrong. Got a different support guy and I ran his commands. People on the server were using up resources.

 

Yea already did that. It was around 50%

 

I didn't have to ask. They did it for me already after I sent them the results. Most of my issues have been because of bad neighbors on Linode.. heh.