CentOS: Fixes Hints Tweaks and Tips
Install Hyper-V Integration Tools
sudo yum install hyperv-daemons sudo reboot systemctl | grep hyperv
https://www.musingitoutloud.com/centos-hyper-v-integration-tools/
HOWTO: Run Script On System Boot in Centos 7
Set the execute bit on the file ...
sudo chmod +x /etc/rc.d/rc.local
Edit the file adding your script at the end ...
sudo nano /etc/rc.local
Test the file ...
sudo systemctl start rc-local
https://nixcp.com/automatically-run-scripts-boot-time-centos-7/
HOWTO: Set Time and Date and TimeZone in Centos 7
sudo timedatectl list-timezones sudo timedatectl set-timezone Europe/London sudo timedatectl set-ntp yes sudo reboot sudo timedatectl
https://www.thegeekdiary.com/centos-rhel-7-how-to-set-datetime-ntp-and-timezone-using-timedatectl/
HOWTO: Security and Protection
yum install yum-security yum list-security
http://www.cyberciti.biz/faq/redhat-fedora-centos-linux-yum-installs-security-updates/
http://wiki.centos.org/HowTos/OS_Protection
http://www.cyberciti.biz/faq/rhel-centos-yum-check-update-security-plugin/
HOWTO: FIX: Rootkit Hunter False Positives
http://forums.cpanel.net/f185/help-rkhunter-output-239141.html
http://www.atomicorp.com/forums/viewtopic.php?f=3&t=5934
HOWTO: INSTALL:
HOWTO: Install ClamAV
For Centos 6+...
su - root rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm rpm -K rpmforge-release-0.5.2-2.el6.rf.*.rpm rpm -i rpmforge-release-0.5.2-2.el6.rf.*.rpm yum search clamav yum install clamav freshclam
List of available packages...
http://pkgs.repoforge.org/clamav/?C=M;O=D
LATEST ROOKIT HUNTER
http://sourceforge.net/projects/rkhunter/files/rkhunter/1.4.2/
SYSTEM UPDATES - MANUAL
su - root yum update
SYSTEM UPDATES - AUTOMATIC DAILY
Centos has a built-in but by default inactive, to activate it:
su -c '/sbin/chkconfig --level 345 yum on; /sbin/service yum start'
Thanks to CentOS and more information here.
HOWTO: FIX:
MISSING NTFS TOOLS fsck.ntfs
yum install ntfs-3g ln -s /usr/bin/ntfsfix /usr/sbin/fsck.ntfs ln -s /usr/bin/ntfsfix /usr/sbin/fsck.ntfs-3g fsck.ntfs -h ntfsfix v2013.1.13 (libntfs-3g) Usage: ntfsfix [options] device Attempt to fix an NTFS partition. -b, --clear-bad-sectors Clear the bad sector list -d, --clear-dirty Clear the volume dirty flag -h, --help Display this help -n, --no-action Do not write anything -V, --version Display version information fsck.ntfs /dev/sdb1 Mounting volume... OK Processing of $MFT and $MFTMirr completed successfully. Checking the alternate boot sector... OK NTFS volume version is 1.2. NTFS partition /dev/sdb1 was processed successfully.
Thanks - http://pclosmag.com/html/Issues/201205/page06.html
HOWTO: Check CentOS Version Number
cat /etc/centos-release
Or
cat /etc/redhat-release
Thanks - http://www.rackaid.com/blog/check-your-centos-version-number/
HOWTO: Add Extra Repositories
http://wiki.centos.org/AdditionalResources/Repositories
HOWTO: Search For A Package
yum list packagename
HOWTO: List All Installed Packages By Date
rpm -qa --last |less
HOWTO: List All Installed Packages
yum list installed
HOWTO: See What Files Are In A Package
yum install -s yum-utils repoquery -q -l packagename
HOWTO: See Which Package A File Belongs To
rpm -qf /usr/sbin/.sshd.hmac
HOWTO: Check System Updates
yum list updates
Command Line Aliases: How To Add/Edit
Open a terminal and edit the .bashrc file
nano ~/.bashrc
Add the following line under the last line starting with 'alias'
alias ping='ping -c3'
CTRL+O then enter to save changes, then CTRL+X to exit
To reload the alias file
source ~/.bashrc
To check...
alias
Keyboard Mapping: How To Change
If you have cause to change the keyboard mapping this is how it is done, in a terminal type:
/etc/sysconfig/keyboard
You will be presented with something similar to the following:
KEYBOARDTYPE='pc' KEYTABLE='us'
You will need to edit the 'KEYTABLE' line to your requirement, for instance:
KEYTABLE='uk'
Network Card - Change From DHCP to Fixed IP Address
NEW
sudo -i nano /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0 BOOTPROTO=static BROADCAST=192.168.0.255 IPADDR=192.168.0.215 NETMASK=255.255.255.0 NETWORK=192.168.0.0 ONBOOT=yes TYPE=Ethernet
/etc/init.d/network restart
OLD
In the terminal type:
system-config-network
Select 'Edit Devices' by pressing 'Enter' on your keyboard
Select the network card you wish to edit by pressing 'Enter' on your keyboard. If you system only has one wired network card the name will most likely be 'eth0'.
Use the arrow key to move the cursor do to 'Use DHCP' section; then press the 'space' to clear the asterix
Arrow down to 'Static IP' and input the address you want to use
Arrow down to 'Netmask' and fill in
Arrow down to 'Default gateway IP' and fill in
Tab to 'OK' and press 'Enter' on your keyboard
Tab to 'Save'
NOTE: At this point you can also edit any DNS settings
Tab to 'Save&Quit' and press 'Enter' on your keyboard
Reboot the system
After rebooting confirm that the settings are correct, in a terminal type:
nano /etc/sysconfig/network-scripts/ifcfg-eth0
If correct use CTRL+X to close
