install rrdtool centos

ref: http://www.cyberciti.biz/faq/howto-install-rrdtool-on-rhel-linux/

Step # 1: Install required dependencies

Login as root and type the following command:
# yum install cairo-devel libxml2-devel pango-devel pango libpng-devel freetype freetype-devel libart_lgpl-devel

Untar tar ball, enter:

Step # 2: Download latest rrdtool tar ball

# tar -zxvf rrdtool-1.3.1.tar.gz

Step #3: Compile and install rrdtool

You need to set PKG_CONFIG_PATH, enter:
# export PKG_CONFIG_PATH=/usr/lib/pkgconfig/
Type the following commands:

Now compile and install RRDTool on RHEL:

# ./configure

# make
# make install
# cd /usr/local/
# ln -s rrdtool-1.3.1/ rrdtool/
# cd rrdtool
# ls -l

Type the following commands:
# cd /opt/
# wget http://oss.oetiker.ch/rrdtool/pub/rrdtool-1.3.1.tar.gz

4gb seg fixup after reformatting

[root@linux ~]# rpm -q glibc.i386
glibc-2.5-65
[root@linux ~]# rpm -q glibc.i686
package glibc.i686 is not installed

it works as expected. now production server works but files gone. hope to get files back using backup disk.

segmentation fault after glibc.i386

what de..
this is my production server. after successfull on test server now i'm trying into real server:

Kernel Panic. last resort reformat. ;)

I tried to updgrade glibc using
[root@demo1 RPMS]# rpm -ivh glibc-2.3.3-74.i386.rpm --force --nodeps
Preparing... ########################################### [100%]
1:glibc ########################################### [100%]
/usr/sbin/glibc_post_upgrade: While trying to execute /usr/sbin/iconvconfig child terminated abnormally
error: %post(glibc-2.3.3-74.i386) scriptlet failed, exit status 115


n now every thing gives a segmentation fault.
it is a dual xeon machine so i take it ..its i686. { pretty sure it doesnt support EM 64 }


now i cannot ls, cannot yum, cannot rpm, wget dammmm...


http://www.linuxquestions.org/questions/slackware-14/heeelp-glib-%2A-removed-335819/#post1707580

i hope to:
& i copied /lib from another machine with the same specs...


dam...

[solved] 4gb fixup problem end

WARNING: try at your own risk.
2. not use this function when memory below 512MB
3. this break down my production server http://blog.apis17.info/2011/09/segmentation-fault-after-glibci386.html -reformat and reinstall solve the problem

finally 4gb fixup on xen is finally gone. (now i have openvz too :) 2.6.18-274.el5.028stab093.2xen

it fixed using i386 version of glibc

#yumdownloader glibc.i386

then yum downloading 'glibc-2.5-65.i386.rpm' package

#rpm -Uvh --force glibc-2.5-65.i386.rpm

it force 32bit glibc version. default my centos  use i686 even os 32-bit. you can read my previous entries. (thanks to cloudlinux forum)

after several hours recovering back from my lost glibc uninstall thanks to webmin saving my life.
and NEVER use this command rpm -e glibc


now i'm ready to get dangerous on production server. will update this post later.

install epel repo

#rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm


i want to install memcached
reference: 
http://www.cyberciti.biz/faq/rhel-fedora-linux-install-memcached-caching-system-rpm/

updating dom-0 clock and problem [xen]

what de..

all dom-U mogok after update NTP time to actual time. after reading reading found this. damm..

https://www.centos.org/modules/newbb/viewtopic.php?topic_id=25237

the effect (dom-U only):

1. network cannot restart.

2. processor clock (at dom-U) not able to detect

3. not able to reboot

4. cannot start after shutdown

5. dom-U clock stop at 3.40AM (dam.. i must sleep dude)

finally swith off and on back. phew..

now clock is working and in correct time.

next reading and experiment will be (in case): http://dsumsky.blogspot.com/2009/01/running-ntpd-inside-xen-domu-or-not.html

lalala...

configuring transparent proxy

still trying

http://wiki.squid-cache.org/SquidFaq/InterceptionProxy

squid transparent proxy

storing this url for future reference

http://www.lesismore.co.za/squid3.html

configuring squid access control list (ACL)

this will explain and giving some example how to configure squid ACL.

http://www.linuxmail.info/squid-acl-elements/

to allow only www.google.com or *.google.com add:

acl www_google dstdomain www.google.com acl www_google dstdomain google.com  # matches exactly google.com acl google_dom dstdomain .google.com # all subdomains of google.com

create yum local repository

i want fast updates on all dom-U client.

there are solution. create local repository.

http://www.howtoforge.com/creating_a_local_yum_repository_centos

so clever. now i'm updating 17mb kernel headers for each dom-U at full speed.

this is bandwidth savers too.. :)

squid with ssl

i think this is good guide to install squid with ssl support

http://ipv6proxy.prolocation.net/howto.php

stored for my future reference.

[Xen] Save file location

cd /var/lib/xen/save

this is path used by xen to store virtual machine state before shutdown/reboot.

i use du -lsh /var/lib/xen/* to trace what folder make my disk space full

Before

Filesystem Size Used Avail Use% Mounted on

/dev/hda6 8.6G 8.6G 0.0G 100% /

After

Filesystem Size Used Avail Use% Mounted on

/dev/hda6 8.6G 7.1G 1.1G 88% /

Solved.

do rsync server backup

trying to follow this:

http://wiki.vpslink.com/Rsync_backup
http://troy.jdmz.net/rsync/index.html

quit from xen console

list all xen machine

xm list

enter console mode

xm console

quit from console mode

press Ctrl + ]

done! :)

thanks to: http://lists.xensource.com/archives/html/xen-users/2008-01/msg00086.html

rebuild xen dom-u kernel

symtom: after dom-0 reboot, all dom-u not in latest kernel. to fix this,

cd /usr/local/lxlabs/hypervm/httpdocs/

lphp.exe ../bin/misc/fixcentos5xen.php

http://markus.revti.com/2010/08/hypervm-xen-installation/

remove  character on centos

https://www.centos.org/modules/newbb/viewtopic.php?viewmode=flat&order=DESC&topic_id=1761&forum=27

1. verify: echo $LANG

2. export LANG="en_US"

done!

UPDATE: to permanently set language each time for each time logi you can edit profile and add new line

 vi .bash_profile  

 press i  
 go to last line and create new line  
 paste this code  

 export LANG="en_US"  

 press escape, enter :wq  

install ssl on shared ip

http://www.thecpaneladmin.com/installing-ssl-certificate-on-shared-ip/

trying this :)

httpd.conf location on cpanel

http://forums.cpanel.net/f34/where-httpd-conf-117485.html

it is on /usr/local/apache/conf

also can be viewed using this

httpd -V

yum hangs on centos

http://www.graphics-muse.org/wp/?p=162

strace yum update

kill first

http://lists.centos.org/pipermail/centos/2009-July/078865.html

kill -9

futex(0x2b1fa0c7a11c, FUTEX_WAIT, 1, NULL

the solution is..

cd /var/lib/rpm
/usr/lib/rpm/rpmdb_recover

install ssl on cpanel with nginx enabled

http://kbeezie.com/view/free-ssl-with-nginx/3/