Abhishek Dujari's questions

I have a lot of hotlinked images. Which is fine but some do not exist anymore due to change in URL. Is it possible to display something like imageshack "image not found error" picture only when images are requested and they do not exist?

Right now I have 404 page but I'd still like to keep that.

I can put up a simple jpg/gif picture saying "Not found" and display that only when pictures are not found.

to be honest I don't know where to begin

my path can be anything from /level1/ to /level1/..../blah/oldpicture.jpg and most pictures are rendered by Gallery2 with url_rewrite so they actually go to php.

 location / {
                try_files $uri $uri /main.php?url=$1;
                #rewrite ^/(.+)$ /main.php?url=$1 last;
        }

also I use this in php fpm config portion

fastcgi_intercept_errors on; # to support 404s for PHP files not found

I could try to this by coding but that is a second option.

I have a problem with php 5.3.6 using PHP-FPM and file uploads.

My Nginx runs as user nginx PHP-FPM uses pools configured for each vhost. For example a user: test group : test runs one pool.

When the php file uploads to temp file it is owned by user test. After move_uploaded_file is executed by php script it is owned by nginx :/.

I do not know if the change in ownership to web server is the correct behaviour. Is there a way in PHP to change the ownership back to the user I want? (Without going the php chown way as it requires root privileges)

I have python script that is called by PHP via exec. It uses urllib2 and beautifulsoup.

The php-fpm runs on port 8000, i have different ports for different pool and I assume they are ok when php-fpm start as everything works smoothly.

Here's a problem. Sometimes PHP-FPM will crash but restarting complains that port is in us. I also notice that the python scripts are running. They are probably on a long time out.

What I cannot figure out is why a python script will interfere with PHP-FPM as it must be on its own process. Why does it take the entire php-fpm and all pools with it. W

Is it conflicting with ports? I have tried changing fpm to use different port but that is not helping.

this occurs randomly, butonce the conditions are met, the FPM servers are gone.

any clues or direction to figure this out will be very helpful.

Thanks to another unrelated question, I found a usable network diagram

            Internet
               |
            (dhcpc)
     ------------------------------
     |       Router A             |
     | default route via internet |
     ------------------------------
          (192.168.2.1) *dhcp server on this interface*
               |
    ----------------------------
    |              |           |
(wireless)      (wired)        |
                         (192.168.2.200)
                     -------------------------
                     |      Router B         |  
                     |  |
                     |  |
                     -------------------------
                          (192.168.3.1) *dhcp server on this interface)
                               |
                -------------------
                |                 |
            (wireless)         (wired)

Right now I only have Windows on my network. The problem is this:

Computer on Router B can access network share on Router A connected Systems. Can even ping etc. However Router A connected systems cannot reach Router B on the Lan Interface as in I cant ping any systems or the router on the 192.168.3.x range of IPs either. I think ICMP is disabled on Router B but still , shares should work. Before someone points out I was using Router B before to connect all and share between all my windows and a samba server just fine.

Router B is a LinkSys router and Router A is EnGenius Router. I am not familiar with EnGenius routers and I have done this years ago when I had a Dlink and WRT54G. I am sure I am missing something here.

Let me describe what I am trying to do first.

I have a bunch of pictures in a directory called /images/*.(jpg|gif|png|blah blah|)

Now say these images are embedded in an html page and I dont really care which image or where its embedded.

For every 10th request for the same picture file (if possible) or for any picture I want to display a fixed image (e.g. trollface.jpg). thats it!

I have searched around a bit but i am not even sure what I am looking for. Rewrite might help but then its a permanent thing. this has got to do something with requests. I have heard perl scripts can be used with nginx. I can't write an nginx module (though I did bravely lookup the docs and then gave up)

Before you ask "But why don't you do it in application, noob?". This is a static files only server. The point is to not execute any binary at all.

I have this problem or rather an itch that I could really use help with. I use autoscale and several instances on Amazon. Problem is I have all these logs PHP, Apache, system but also my web app generating traffic logs etc etc. I want to consolidate all these logs. I know syslogd etc exist, but I was wondering whats the most effective , low administrative solution devops are using currently since my experience on Amazon AWS isn't that extensive. Plus I need the solution to be low resource usage if possible. Hitting database to save all that data every second is not a good solution for me.

Please note I am NOT talking about system monitoring which is served by CloudWatch etc. more for the applications and servers running as well as writing custom application logs. Also all systems are assumed to be Redhat Linux.

Any help or direction is appreciated.

I just did a yum install of php on amazon linux beta. (it's similar to centos, jfyi)

php -v reveals its php 5.3.6. awesome so. Now I am trying to figure out if I can package install the php-fpm.

cant find anything specific on FPM. doc says its included but it seems it might need to be compiled. I don't see a yum install php-fpm to make my life easier. :)

so please do guide me on this if you know how. alternatively if we need to compile I would appreciate the complete configure param to help me a bit. I don't want to miss anything essential in compile time.

thank you in advance , need sleep

I understand cherry.py server is multithreaded which theoretically would be a problem with php fastcgi in general. But would it be possible? has anyone tried it and can please share the idea/experience. Honestly I don't know where to start at all on configuring cherry.py for such a setup.

would the php-fpm be more reasonable solution to this?

I am thinking that it may be possible similar to nginx to send request to php-fpm from cherry.py with proper config.

I have been using xcache for a long time. Recently I put together php-fpm and nginx. I see apc is installed and enabled in the configuration. I was assuming that apc will automatically opcode the files and store it somewhere. According to config it should be in /tmp/apx.xxxx but there is no such thing there.

What am i missing? any clues to investigate would be of much help. Please note I am using php 5.3 fpm.

thanks mates.

UPDATE: i looked at apc.php it says things are fine. will just have to take its word for it.

I have a forum/groups site that contains a lot of external URLs, sometimes direct download links. I want to protect my visitors from possible attacks from malware sites as they are mot likely to click on these links. CUrrently I implement DBL (spamhaus) but thats not enough. I want to run a background task to check the outgoing links first. I have looked at similar questions in StackOverflow (wrongly posted there) and here but fail to find a question same as mine or a good answer.

People have suggested ClamAV , I don't believe it can detect Web hosted malware sites and its has a lot of missed detection. I have looked at google safe browsing service ( http://code.google.com/apis/safebrowsing/developers_guide_v2.html very complicated to implement or maintain plus midway I get lost :S )

I can go for commercial solution, anything to protect the visitors and my site brand. But I would like to hear the opinion of server admins and if anyone has implemented such a service.

My Server is basic CentOS LAMP stack.

thank you very much in advance.

This is my first question on Stacks. I always read a lot of solutions to problems here almost every other day. So thank you to all contributors. I am a noob here so please spare some space if I am doing something wrong. My question is

I am trying to setup a Postfix server to be an SMTP only host for multiple domain names. I do not allow remote connection I just want to be able to use my cron scripts to send emails for various domains. Currently Postfix is default installation but I have added

 myhostname=example.com

Now problem is if I send email from [email protected] the host shown in email headers (not in From address) is example.com the exact header is

Received: from example.com 

my from address is correct. Pardon me but I really don't know a lot about email servers. My incoming is handled by another hosting provider and I know I need to add a reverse dns etc. So please if anyone knows what I should do so all domains have right DNS entries plus good postfix configuration. I want postfix to use the same domain name as the from address. I only need smtp and nothing else.

I have searched google and Stacks but none answered the question completely even if the question was similar.

Thanks in advance, I am still RTFMing all over the place.

I am also getting these errors in my mailog. i have replaced a real valid domain name with MYDOMAIN and a real system username with USER

Feb 14 22:53:13 li222-89 postfix/smtpd[28433]: connect from localhost[127.0.0.1]
Feb 14 22:53:13 li222-89 postfix/smtpd[28433]: 428FCA400C: client=localhost[127.0.0.1]
Feb 14 22:53:13 li222-89 postfix/cleanup[28436]: 428FCA400C: message-id=<4d59f8a8-0ab4-4aee-b6e6-6f0c9389ad7c@>
Feb 14 22:53:13 li222-89 postfix/qmgr[27293]: 428FCA400C: from=<[email protected]>, size=1047, nrcpt=1 (queue active)
Feb 14 22:53:13 li222-89 postfix/smtpd[28433]: disconnect from localhost[127.0.0.1]
Feb 14 22:53:13 li222-89 postfix/smtp[27755]: certificate verification failed for gmail-smtp-in.l.google.com: num=20:unable to get local issuer certificate
Feb 14 22:53:13 li222-89 postfix/smtp[27755]: certificate verification failed for gmail-smtp-in.l.google.com: num=27:certificate not trusted
Feb 14 22:53:13 li222-89 postfix/pickup[26953]: C3761A400D: uid=500 from=<USER>
Feb 14 22:53:13 li222-89 postfix/cleanup[28436]: C3761A400D: message-id=<[email protected]>
Feb 14 22:53:13 li222-89 postfix/qmgr[27293]: C3761A400D: from=<[email protected]>, size=3237, nrcpt=1 (queue active)
Feb 14 22:53:14 li222-89 postfix/smtp[26830]: certificate verification failed for aspmx.l.google.com: num=20:unable to get local issuer certificate
Feb 14 22:53:14 li222-89 postfix/smtp[26830]: certificate verification failed for aspmx.l.google.com: num=27:certificate not trusted
Feb 14 22:53:15 li222-89 postfix/smtp[27755]: 428FCA400C: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[74.125.155.27]:25, delay=2.6, delays=0.02/0.02/0.66/1.9, dsn=2.0.0, status=sent (250 2.0.0 OK 1297741995 l9si6487318yhl.10)
Feb 14 22:53:15 li222-89 postfix/qmgr[27293]: 428FCA400C: removed
Feb 14 22:53:17 li222-89 postfix/smtp[26830]: C3761A400D: to=<[email protected]>, orig_to=<USER>, relay=aspmx.l.google.com[74.125.155.27]:25, delay=14, delays=11/0/0.44/3.1, dsn=5.1.1, status=bounced (host aspmx.l.google.com[74.125.155.27] said: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. Learn more at                              550 5.1.1 http://mail.google.com/support/bin/answer.py?answer=6596 hj39si8560308ibb.50 (in reply to RCPT TO command))
Feb 14 22:53:17 li222-89 postfix/cleanup[28436]: 726DFA400C: message-id=<[email protected]>
Feb 14 22:53:17 li222-89 postfix/qmgr[27293]: 726DFA400C: from=<>, size=5596, nrcpt=1 (queue active)
Feb 14 22:53:17 li222-89 postfix/bounce[28222]: C3761A400D: sender non-delivery notification: 726DFA400C
Feb 14 22:53:17 li222-89 postfix/qmgr[27293]: C3761A400D: removed
Feb 14 22:53:17 li222-89 postfix/smtp[27755]: certificate verification failed for aspmx.l.google.com: num=20:unable to get local issuer certificate
Feb 14 22:53:17 li222-89 postfix/smtp[27755]: certificate verification failed for aspmx.l.google.com: num=27:certificate not trusted
Feb 14 22:53:21 li222-89 postfix/smtp[27755]: 726DFA400C: to=<[email protected]>, relay=aspmx.l.google.com[74.125.155.27]:25, delay=3.6, delays=0.02/0.01/0.44/3.1, dsn=5.1.1, status=bounced (host aspmx.l.google.com[74.125.155.27] said: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. Learn more at                              550 5.1.1 http://mail.google.com/support/bin/answer.py?answer=6596 mu18si8573893ibb.7 (in reply to RCPT TO command))
Feb 14 22:53:21 li222-89 postfix/qmgr[27293]: 726DFA400C: removed

Obviously its trying to send email to a gmail account but something is wrong ...really wrong.