PHP Warning: PHP Startup: Unable to load dynamic library ‘/usr/lib64/php/modules/imagick.so’ – liblcms2.so.2: cannot open shared object file: No such file or directory in Unknown on line 0

Not able to install imagick on CentOS, fedora or RHEL

liblcms2.so.2: cannot open shared object file

Install following packages in RHEL, fedora or CentOS

yum install lcms2

Find out which version of Centos/Red Hat/Fedora you are running

bojan@veprina:~$ lsb_release -a

LSB Version:    :base-4.0-ia32:base-4.0-noarch:core-4.0-ia32:core-4.0-noarch:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-ia32:printing-4.0-noarch
Distributor ID:    CentOS
Description:    CentOS release 6.4 (Final)
Release:    6.4
Codename:    Final

ssh login without password

veoma korisna stvar ako imate puno unix strojeva i cesto se logujete…radite nesto…tj ssh-ujete 🙂

cilj je da se namjesti ssh pristup masini bez kucanja sifre.

[                 ]——>[ server1 ]
[   client  ]——>[ server2 ]
[                 ]——>[ neki_komp ]

konfiguracija sa klijentske strane:

ssh-keygen -t rsa
ssh-copy-id root@server1_ip
ssh-copy-id root@server2_ip
ssh-copy-id root@neki_komp_ip

i kada se pokusa ssh root@server1_ip, ne trazi nam vise sifru….yeaah 😀

yum repository sa cd-a

nema neta a potrebni su vam neki programi, servisi, jedini izvor paketa je CD/DVD…

root@R3:~#mount /dev/cdrom /mnt

[cdrom]
name=repo sa diska
baseurl=file:///mnt/
enabled=1
gpgcheck=1
gpgkey=file:///mnt/RPM-GPG-KEY-redhat-release

root@R3:~# yum search httpd
Loaded plugins: product-id, subscription-manager
Updating Red Hat repositories.
================================================= N/S Matched: httpd =================================================
httpd.i686 : Apache HTTP Server
httpd-devel.i686 : Development interfaces for the Apache HTTP server
httpd-manual.noarch : Documentation for the Apache HTTP server
httpd-tools.i686 : Tools for use with the Apache HTTP Server
mod_dav_svn.i686 : Apache httpd module for Subversion server
mod_dnssd.i686 : An Apache HTTPD module which adds Zeroconf support

Name and summary matches only, use “search all” for everything.

/etc/inittab missing?

inittab sluzi da kaze sistemu u koji runlevel da se buta.

mozda je greskom obrisan ili …

kako ga povratiti:
boot sa nekim linux diskom u rescue mod, probe ce da utvrde da li postoji neka linux instalacija i mountovace os u /mnt/sysimage
povrat inittab-a se vrsi reinstalacijom initscripts rpm-a lokalno sa diska ili sa neta. ako ide sa neta onda je potrebno podesiti mrezu za vreme boot-a rescue moda.
chroot /mnt/sysimage – promjenili smo root na nas sistem koji zelimo povratiti
yum search initscripts – apt-get search initscripts
yum install initscripts – apt-get install initscripts
reboot

drugi nacin – instalacija rpm-a sa diska:

najpre je potrebno mountovati disk u lokalni folder naseg rescue sistema.

mount /dev/cdrom /mnt/sysimage/mnt
chroot /mnt/sysimage
root@R3:~# ls /mnt/
EULA                      RELEASE-NOTES-bn-IN.html  RELEASE-NOTES-ko-KR.html  RELEASE-NOTES-zh-CN.html
GPL                       RELEASE-NOTES-de-DE.html  RELEASE-NOTES-ml-IN.html  RELEASE-NOTES-zh-TW.html
HighAvailability          RELEASE-NOTES-en-US.html  RELEASE-NOTES-mr-IN.html  repodata
images                    RELEASE-NOTES-es-ES.html  RELEASE-NOTES-or-IN.html  ResilientStorage
isolinux                  RELEASE-NOTES-fr-FR.html  RELEASE-NOTES-pa-IN.html  RPM-GPG-KEY-redhat-beta
LoadBalancer              RELEASE-NOTES-gu-IN.html  RELEASE-NOTES-pt-BR.html  RPM-GPG-KEY-redhat-release
media.repo                RELEASE-NOTES-hi-IN.html  RELEASE-NOTES-ru-RU.html  Server
Packages                  RELEASE-NOTES-it-IT.html  RELEASE-NOTES-si-LK.html  TRANS.TBL
README                    RELEASE-NOTES-ja-JP.html  RELEASE-NOTES-ta-IN.html
RELEASE-NOTES-as-IN.html  RELEASE-NOTES-kn-IN.html  RELEASE-NOTES-te-IN.html

rpm -ivh —replacepkgs /mnt/Centos/initscripts-8.45.14.x86_64.rpm

inittab je povracen.

reboot

DHCP server

instalacija:

yum -y install dhcp

editovanje konfiguracionog fajla

nano /etc/dhcpd.conf

ddns-update-style interim;
ignore client-updates;

subnet 192.168.191.0 netmask 255.255.255.128 {

range 192.168.191.70 192.168.191.75;
# — default gateway
option routers                  192.168.191.1;
option subnet-mask              255.255.255.128;
option nis-domain               “domen”;
option domain-name              “domen”;
option domain-name-servers    192.168.1.8;
#    option time-offset              -18000; # Eastern Standard Time
option ntp-servers              ntp.server.domen;
#    option netbios-name-servers     192.168.1.1;
# — Selects point-to-point node (default is hybrid). Don’t change this unless
# — you understand Netbios very well
#    option netbios-node-type 2;

#    range dynamic-bootp 192.168.0.128 192.168.0.254;
default-lease-time 21600;
max-lease-time 43200;

# we want the nameserver to appear at a fixed address

host jebiga {
#next-server marvin.redhat.com;
hardware ethernet 12:34:56:78:AB:CD;
fixed-address 207.175.42.254;
}
}

Centos – apache boot

po defaultu apache nije startovan niti se pokrece sa sistemom.

chkconfig –level 35 httpd on

opcije 3 i 5 omogucavaju da se apache butuje sa sitemom tj sa runlevelom.

chkconfig –list httpd
httpd           0:off   1:off   2:off   3:on    4:off   5:on    6:off

–list prikazuje sta je ukljuceno…

ovaj princip se moze primjeniti i na bilo koji drugi servis kao sto je named, ssh, ftp…