Archive for the ‘Mẹo vặt của hiếu râu’ Category

Mar

Devtools2 for CentOS

Posted by: admin

source link https://braaten-family.org/ed/blog/2014-05-28-devtools-for-centos/

Posted on 2014-05-28 by Ed Braaten

I needed to compile some source that required a newer version of the GNU GCC compiler than the ancient 4.4.7 20120313 that comes with my fully-up-to-date CentOS 6.5 Linux system. Following the steps below, I was able to install and use devtools-2 which contains a fully functioning 4.8.2 20140120 version of the GNU GCC compiler environment.

Go to the /etc/yum.repos.d/ directory on your system and download the devtools-2.repo file from http://people.centos.org/tru/devtools-2/:

cd /etc/yum.repos.d wget http://people.centos.org/tru/devtools-2/devtools-2.repo

Install the gcc, binutils, fortran, and C++ packages with:

yum install devtoolset-2-gcc yum install devtoolset-2-binutils yum install devtoolset-2-gcc-gfortran yum install devtoolset-2-gcc-c++

Use the “scl” command to open a shell which is running in the devtools environment:

scl enable devtoolset-2 bash

No mess, no fuss! The devtools-2 environment is fully self-contained and doesn’t impact your distro’s base compiler environment.

=========== UPDATE =============

# 1. Install a package with repository for your system:
# On CentOS, install package centos-release-scl available in CentOS repository:
$ sudo yum install centos-release-scl

# On RHEL, enable RHSCL repository for you system:
$ sudo yum-config-manager --enable rhel-server-rhscl-7-rpms

# 2. Install the collection:
$ sudo yum install devtoolset-6

# 3. Start using software collections:
$ scl enable devtoolset-6 bash

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Mar

apache mod_qos

Posted by: admin

$ wget http://sourceforge.net/projects/mod-qos/files/latest/download

cd tools

./configure make make install

(replace automake-1.14 with -1.11)

$ cd mod_qos-10.15/apache2/
$ apxs2 -i -c mod_qos.c

[root@us conf.d]# cat qos.conf

LoadModule qos_module modules/mod_qos.so

# minimum request rate (bytes/sec at request reading):

QS_SrvRequestRate 120

# limits the connections for this virtual host:

QS_SrvMaxConn 100

# allows keep-alive support till the server reaches 600 connections:

QS_SrvMaxConnClose 60

# allows max 50 connections from a single ip address:

QS_SrvMaxConnPerIP 25

# disables connection restrictions for certain clients:

#QS_SrvMaxConnExcludeIP 172.18.3.32

#QS_SrvMaxConnExcludeIP 192.168.10.

# allows not more than 20 events/penalty points per 10 minutes:

QS_ClientEventBlockCount 20

# don’t allow a client to access /app/start.html more than

# 20 times within 10 minutes:

#SetEnvIf Request_URI /app/start.html QS_Block=1

# don’t allow more than 4 “403″ status code responses

# (forbidden) for a client within 10 minutes:

QS_SetEnvIfStatus 403 QS_Block=5

QS_SetEnvIfStatus 301 QS_Block=2

[root@us conf.d]#

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Mar

linux performance monitor

Posted by: admin

#vmstat 2

#top

#glances

#sar -r

#to be continued …

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Feb

freeRadius + PAM

Posted by: admin

# yum install freeradius

#yum install freeradius-utils

#cd /etc/raddb/sites-enabled

#rm inner-tunnel

#vi default

uncomment pam (Pluggable Authentication Modules)

#vi ../users

uncomment lameuser

add : DEFAULT AUTH-Type := PAM

#vi /etc/pam.d/radiusd

#%PAM-1.0

auth required pam_linotp.so nosslhostnameverify nosslcertverify url=https://localhost/OTP/pam.php

account required pam_permit.so

#auth include password-auth

#account required pam_nologin.so

#account include password-auth

#password include password-auth

#session include password-auth

#radtest my_username my_password localhost 18230 testing123

Sending Access-Request of id 228 to 127.0.0.1 port 1812

User-Name = “my_username”

User-Password = “my_password”

NAS-IP-Address = 127.0.0.1

NAS-Port = 18230

Message-Authenticator = 0×00000000000000000000000000000000

rad_recv: Access-Accept packet from host 127.0.0.1 port 1812, id=228, length=20

http://freeradius.org/pam_radius_auth/

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Nov

php pthreads

Posted by: admin

error_reporting(E_ALL);
class AsyncWebRequest extends Thread {
    public $url;
    public $data;

    public function __construct($url) {
        $this->url = $url;
    }

    public function run() {
        if (($url = $this->url)) {
            /*
             * If a large amount of data is being requested, you might want to
             * fsockopen and read using usleep in between reads
             */
            $this->data = file_get_contents($url);
        } else
            printf("Thread #%lu was not provided a URL\n", $this->getThreadId());
    }
}

$t = microtime(true);
$g = new AsyncWebRequest(sprintf("http://www.google.com/?q=%s", rand() * 10));
/* starting synchronized */
if ($g->start()) {
    printf("Request took %f seconds to start ", microtime(true) - $t);
    while ( $g->isRunning() ) {
        echo ".";
        usleep(100);
    }
    if ($g->join()) {
        printf(" and %f seconds to finish receiving %d bytes\n", microtime(true) - $t, strlen($g->data));
    } else
        printf(" and %f seconds to finish, request failed\n", microtime(true) - $t);
}

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Nov

mysql multi instance

Posted by: admin

mkdir -p /var/lib/mysql2

chown mysql:mysql mysql2


cp -p /etc/my.cnf /etc/my2.cnf
vi my2.cnf

[mysqld]
datadir=/var/lib/mysql2
socket=/var/lib/mysql/mysql2.sock
port=3337

[mysqld_safe]
log-error=/var/log/mysqld2.log
pid-file=/var/run/mysqld/mysqld2.pid



mysql_install_db --user=mysql --datadir=/var/lib/mysql2

mysqld_safe --defaults-file=/etc/my2.cnf &
netstat -antp | grep 3337

mysqladmin -S /var/lib/mysql/mysql2.sock shutdown -p
mysql -S /var/lib/mysql/mysql2.sock -u root -p

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Nov

procmail - sendmail subject filter

Posted by: admin

[root@ns6 abc.cadena-it.com]# cat .procmailrc

VERBOSE=off

MAILDIR=$HOME/mail # elm users might use $HOME/Mail instead

DEFAULT=/var/spool/mail/abc.macatung.com

LOGFILE=$HOME/log

CLAMDSCAN=/usr/bin/clamdscan

/dev/null

* ^From.*(MAILER-DAEMON)

/dev/null

{

RESULT=`$CLAMDSCAN –stdout –no-summary -`

:0 Di

* RESULT ?? FOUND

/dev/null

}

[root@ns6 abc.cadena-it.com]#

general.rc


:0
* ^Cc.*joe@somewhere.org
* ^Cc.*me
{
	:0 c
	$DEFAULT

	:0
	SOME_FOLDER
}

:0
* ^Subject.*something-or-other
! another@address.com

lists.rc

:0

* ^From.*redhat.*list.*list.*@

redhat-lists

:0 * ^From.*owner@independence independence-list

spam.rc

	  
:0
* ^From.*my-buddy
* ^Subject.*(Fwd|Forward|joke)
/dev/null

:0
* !(To|Cc).*my_address		# this is my account here
* !(To|Cc).*my_address_2	# I get mail forwarded from here
* !From.*my\.domain\.edu	# I trust the locals not to spam
* !From.*list.*@			# don't trash anything from mail lists
* !From.*good-buddy		# sometimes Bcc's me person mail to his sig-other
spam

:0
* ^From.*big-jerk
/dev/null

guestbook.rc

Subject:.*Form Posted

| cat&>$HOME/guestmail && \

$HOME/bin/guestscript $HOME/guestmail

Appendix: egrep regular expressions

`^`	matches the beginning of the line
`$`	matches the end of the line
`.`	Matches any single character
`(character)*`	match arbitrarily many occurences of (character)
`(character)?`	Match 0 or 1 instance of (character)
`[abcdef]`	Match any character enclosed in [] (in this instance, a b c d e or f) ranges of characters such as `[a-z]` are permitted. The behaviour of this deserves more description. See the page ongrep for more details about the syntax of lists.
`[^abcdef]`	Match any character NOT enclosed in [ ] (in this instance, any character other than a b c d e or f)
`(expression)`	Group operator. Contents of parentheses treated as one character with respect to * , + , ? and \| concatenation operators
`\n`	Backreference - matches the contents of the nth set of parentheses
`expression1\|expression2`	Matches expression1 or expression 2.

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Oct

apache MPM worker

Posted by: admin

rpm --import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt
cd /tmp/
wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
rpm -ivh rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm


vim /etc/httpd/conf.d/fastcgi.conf

FastCgiWrapper Off

<IfModule mod_fastcgi.c>
    AddHandler php5-fcgi .php
    Action php5-fcgi /php5-fcgi
    Alias /php5-fcgi /usr/lib/cgi-bin/php5-fcgi
    DirectoryIndex index.php
    FastCgiExternalServer /usr/lib/cgi-bin/php5-fcgi -socket /var/run/php5-fpm.sock -pass-header Authorization
</IfModule>

mkdir -p /usr/lib/cgi-bin

vim /etc/php-fpm.d/www.conf 

listen = /var/run/php5-fpm.sock
beware of sock permission ( nobody 666 )
vi /etc/sysconfig/httpd
HTTPD=/usr/sbin/httpd.worker

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Sep

sendmail - special port per Mailer

Posted by: admin

Msmtp, P=[IPC], F=mDFMuX, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP, E=\r\n, L=990,

T=DNS/RFC822/SMTP,

A=TCP $h

Mesmtp, P=[IPC], F=mDFMuXa, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP, E=\r\n, L=990,

T=DNS/RFC822/SMTP,

A=TCP $h 587

Msmtp8, P=[IPC], F=mDFMuX8, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP, E=\r\n, L=990,

T=DNS/RFC822/SMTP,

A=TCP $h

Mdsmtp, P=[IPC], F=mDFMuXa%, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP, E=\r\n, L=990,

T=DNS/RFC822/SMTP,

A=TCP $h

Mrelay, P=[IPC], F=mDFMuXa8, S=EnvFromSMTP/HdrFromSMTP, R=MasqSMTP, E=\r\n, L=2040,

T=DNS/RFC822/SMTP,

A=TCP $h 3535

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Sep

Sogo webmail

Posted by: admin

http://www.iredmail.org/docs/sogo-centos-6-mysql.html

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Archive for the ‘Mẹo vặt của hiếu râu’ Category

Devtools2 for CentOS

source link https://braaten-family.org/ed/blog/2014-05-28-devtools-for-centos/

apache mod_qos

linux performance monitor

freeRadius + PAM

php pthreads

mysql multi instance

procmail - sendmail subject filter

general.rc

lists.rc

spam.rc

guestbook.rc

Appendix: egrep regular expressions

apache MPM worker

sendmail - special port per Mailer

Sogo webmail

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