Werulz's questions

I know some of you might find my question stupid but i need to know how much ram is installed on a centos box Yes i know it can easily be done by using the command

awk '/MemTotal/{print $2}' /proc/meminfo

However the problem is that the memory shown is not really want i need.The value shown will always be less than expected as some ram is used to load the kernel.Thus a 512 MB ram server will always show a little less than 524288 kb.

The reason while i need the full physical ram is very simple.I need to modify settings automatically on a box via my bash script. Thus if server has total 512 MB ram , one set of setting is used , if 1gb then another.....

I cannot gamble with the value return by the command above as value varies from system to system.

Any good valid option guys.......

Kind Regards

My friend have a site that allows users to download files.However the moment one guy start downloading server load change from 0.00 to 3.50 in a matter of minutes.Nginx and php-fpm reach D state and IOwait is like 100% on all cpu cores.I tried to limit number of concurrent connection but this seems to have no effect on server load.

user              nginx;
worker_processes  4;



events {
    worker_connections  1024;
}


sendfile        on;
#tcp_nopush     on;
gzip  on;
#keepalive_timeout  0;
keepalive_timeout  2;

My php-fpm setting

pm.max_children = 7
pm.start_servers = 5
pm.min_spare_servers = 5
pm.max_spare_servers = 6
pm.max_requests = 500

Server - 8gb ram Quad core processor 1TB sata hdd

I am having some problem in trying to setup DNS for my domain on my server. This tutorial normally works fine for me but when i tried to lookup my domain it gives the following output

Server: 4.2.2.1 Address: 4.2.2.1#53

Non-authoritative answer: 119.100.79.64.in-addr.arpa name = server.leech4ever.com.

Authoritative answers can be found from:

The server and the address are wrong according to the tutorial

Here is tutorial

http://webcache.googleusercontent.com/search?q=cache:rR7Z4YU4GI0J:www.broexperts.com/2012/03/linux-dns-bind-configuration-on-centos-6-2/+broexperts+bind&cd=1&hl=en&ct=clnk&gl=mu

/etc/hosts

127.0.0.1 localhost
64.79.100.119 server.leech4ever.com server

/etc/resolve.conf

search leech4ever.com
nameserver 64.79.100.119

/etc/resolv.conf

nameserver 4.2.2.1
nameserver 4.2.2.2

How to solve this problem guys.....The tutorial was flawless until i did a server restore

Can anyone help me with nginx "location" I want to add this block to my nginx conf

 location / {
       limit_conn zone_name 8; 
     }

I need to modify location to /folder/index.php?file=x Where x can be an string (e.g 7fe8j)

Thanks

I installed nginx and the HttpRealipModule to get the original ip of my visitors.I also add this in the http{ } part in my nginx.conf

  set_real_ip_from   204.93.240.0/24;
  set_real_ip_from   204.93.177.0/24;
  set_real_ip_from   199.27.128.0/21;
  set_real_ip_from   173.245.48.0/20;
  set_real_ip_from   103.22.200.0/22;
  set_real_ip_from   141.101.64.0/18;
  set_real_ip_from   108.162.192.0/18;
  set_real_ip_from   190.93.240.0/20;
  real_ip_header     CF-Connecting-IP;

However when i do

netstat -atun | awk '{print $5}' | cut -d: -f1 | sed -e '/^$/d' |sort | uniq -c | sort -n

To find out the ip address of my visitors , all the ip i get has ISP as Cloudflare(i traced those ip) Any idea why its not showing the original ip

-Some other question I want to limit the number of concurrent connections people use while downloading from my site.If i use limit_conn 4; it will do the job but if user is downloading and try to access site from browser he/she get 503 unavailable.Is there a way to limit connections but still allow users to view site simultaneously

I just ordered a server from serverdeals.org . I am having a weird problem that even support can't find out what is that

They gave me a raw server and i install nginx just as i wanted(its successful) However when i went to http://serverip/ , browsers says page not available(aka offline)

What could it be ...First time i am getting this Its definely not an installation error on my part as i have installed nginx on numerous servers till date

What can the server guys missed? I can ssh and login via ftp fine though

UPDATE:

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      1184/rpcbind
tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      15847/nginx
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      1503/sshd
tcp        0      0 0.0.0.0:52888               0.0.0.0:*                   LISTEN      1202/rpc.statd
tcp        0      0 :::45774                    :::*                        LISTEN      1202/rpc.statd
tcp        0      0 :::111                      :::*                        LISTEN      1184/rpcbind
tcp        0      0 :::22                       :::*                        LISTEN      1503/sshd

I want to add Cloudflare on the server i will receive in some days. However to preserve my visitors IP, I will have to install HttpRealIpModule module as per Cloudflare wiki -- https://www.cloudflare.com/wiki/Nginx

I use these EPEL repository,

rpm --import https://fedoraproject.org/static/0608B895.txt
rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-7.noarch.rpm
rpm --import http://rpms.famillecollet.com/RPM-GPG-KEY-remi 
rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
yum install yum-priorities

and then

yum install nginx 

I have two questions,

1. Will these install the HttpRealIpModule automatically
2. If not how can i install it with these EPEL repositories

I am a beginner in bash scripting.I want to create a bash script to install install and configure stuffs on my linux box in an automated way.

Suppose i want to edit

/etc/yum.repos.d/epel.repo

by the bash script

What i want to do is as follows

1. Open file /etc/yum.repos.d/epel.repo
2. Find [epel] section
3. Add a line priority=10 just after line enabled=1 in the epel section

For the first part i added

yum install nano
nano /etc/yum.repos.d/epel.repo

My Question is how to do the 2 and 3rd part with bash script using nano (if possible , in case not possible then show me with sed)

Also at some points i will have to modify variables in files For e.g

1. enable = 0 to enable = 1
2. Testing = "1" to Testing = "0"
3. Add text in a line . functions = to function = "text1","text2"
4. Add some text to a file and save it(with nano)

I know its demanding but i need to create this for a friend who is noob at server management.Unfortunately i don't have time to study bash scripting from start as my exams as near.I will use your examples to write the script.

Guys thanks for all the replies I have successfully done most of the bash script

However i have another problem Lets suppose i want to modify nginx.conf using sed We will deal with worker_processes
Now i want use sed to do the following 1.Find the FIRST occurrence of worker_processes in that conf and replace text with worker_processes 4;

Special Note Here: This is just an example. It may happen that the conf contain worker_processes 1; . This is hard part . I want a sed command that find the FIRST wHOLE match case of the word worker_processes , delete line of text where the word is found and and paste worker_processes 4; there and then save file. This is the most reliable method i though of when editing files (without nay risk of breaking any conf

One last suggestion I used sed -i 's/enabled=0/enabled=1/g' /etc/yum.repos.d/remi.repo to change enabled =0 to enabled=1 under the [remi] section in remi.repo .However i have a feeling that it may modify all enabled=0 in that file , which will wreak the server.Can anyone suggest a better code.

Another stuff i am not sure of:P I want to edit a file that has this as Text Testing = "0"(Yes it has quotes and i need to keep it) It should be modified from Testing = "0" to Testing = "1"(with quotes)

Also i need to add some text with quotes at the end of a file with sed Like "Thanks Quanta"(with quote) For php you put a \ with echoing quotes , don't know how it is done for bash

Another thing
I need to modify a line in a conf but i don't remember what is the whole of text to replaced

Like its listen = something; , i want to modify it to listen = /tmp/php5-fpm.sock;

Big thumbs up for up quanta

Thanks for the awesome support guys

I need to convert

RewriteEngine on
RewriteBase /generate
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/(.*)/ index.php?file=$2

To nginx conf

Can anyone help me with this? Important: The htaccess was in a folder called generate Give me a suitable code that will replace the htaccess in that folder Please show me exact code , looks complicated for me:)

The non www version of my site is not loading.....i strongly think its DNS and not nginx(I haven't setup an redirect in nginx yet .The www version works perfect

I don't use any cpanel atm and i don't want to use one either I followed this tutorial http://www.broexperts.com/2012/03/linux-dns-bind-configuration-on-centos-6-2/ Its exactly like the one in tutorial above except that i modified his domain to mine Here is my site http://www.leech4ever.com/ (Remove www from link and site won't load)

Please help me to solve this problem , i need both of the versions to work .I will redirect to version of my choice later Some extra info: OS - Centos 6 No control panel Guys please help me to solve this non www version of site not loading. Also the tutorial above don't say how to add slave nameserver(ns2).For me the ip of ns 1 is same as ns2. Notice: I am complete noob when it comes to dns , can you please give me setup by setup tutorial

Here are the dns configuration /etc/named.conf

// // named.conf // // Provided by Red Hat bind package to configure the ISC BIND named(8) DNS // server as a caching only nameserver (as a localhost DNS resolver only). // // See /usr/share/doc/bind*/sample/ for example named configuration files. //

options { listen-on port 53 { 127.0.0.1; }; listen-on-v6 port 53 { ::1; }; directory "/var/named"; dump-file "/var/named/data/cache_dump.db"; statistics-file "/var/named/data/named_stats.txt"; memstatistics-file "/var/named/data/named_mem_stats.txt"; allow-query { localhost; }; recursion yes;

dnssec-enable yes; dnssec-validation yes; dnssec-lookaside auto;

/* Path to ISC DLV key */ bindkeys-file "/etc/named.iscdlv.key";

managed-keys-directory "/var/named/dynamic"; };

logging { channel default_debug { file "data/named.run"; severity dynamic; }; };

zone "." IN { type hint; file "named.ca"; };

zone "leech4ever.com" { type master; file "leech4ever.com.fwd"; };

zone "0.168.192.in-addr.arpa" { type master; file "leech4ever.com.rev"; }; include "/etc/named.rfc1912.zones"; include "/etc/named.root.key"; leech4ever.com.fwd $ORIGIN leech4ever.com.

$TTL 3D

@ SOA luna380.startdedicated.com. root.leech4ever.com. (12 4h 1h 1w 1h)

@ IN NS luna380.startdedicated.com.

luna380.startdedicated.com. IN A 85.25.100.52

www IN A 85.25.100.52

leech4ever.com.rev

$ORIGIN 0.168.192.in-addr.arpa.

$TTL 3D

@ SOA luna380.startdedicated.com. root.leech4ever.com. (12 4h 1h $

@ IN NS luna380.startdedicated.com.

211 IN PTR luna380.startdedicated.com.

Just a question Accoding to me NS are ns6.nameserverservice.de. & ns5.nameserverservice.de then why hostname luna380.startdedicated.com. is in dns

You guys know better , please fix this for me