How to clear the YUM cache

What is yum?

The Yellowdog Updater, Modified (yum) is an open-source command-line package-management utility for Linux operating systems using the RPM Package Manager. Yum allows automatic updates, package and dependency management, on RPM-based distributions. Like the Advanced Packaging Tool (APT)

How to clear the yum cache:

When a package is downloaded, installed and is removed there is a chance that the package may still be saved/stored in the yum’s cache. So to clean all the cached packages from the enabled repository cache directory, login as root and execute the following:

#yum clean packages

To purge the old package headers information completely, execute the execute the command below:

#yum clean headers

To clean metadata for each enabled repository, execute the command below:

#yum clean metadata

If you wish to clean all the cached files from any enabled repository at once, execute the command:

#yum clean all

Mount an NTFS drive on CentOS 7

NTFS-3G

NTFS-3G is a stable, open source, GPL licensed, POSIX, read/write NTFS driver for Linux. It provides safe handling of the Windows XP, Windows Server 2003, Windows 2000, Windows Vista, Windows Server 2008 and Windows 7 NTFS file systems.

NTFS-3G can create, remove, rename, move files, directories, hard links, and streams.

To mount an NTFS drive, start off by adding the remi-release and epel-release repos to your installation

Epel Repo: https://fedoraproject.org/wiki/EPEL
#yum install epel-release

Remi Repo: https://rpms.remirepo.net
wget http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
rpm -Uvh remi-release-7.rpm

How Do I Install NTFS-3G

Issue the following command to install

#yum install ntfs-3g
You also need the Fuse package but it’s usually pre-installed on CentOS, just verify if it’s installed or not

#yum install fuse

Load the module
#modprobe fuse
List the attached drives to find the NTFS drive to mount

#fdisk -l - show all drive

How Do I Find Out NTFS Partition Name?

Simply type the following command:
# fdisk -l /dev/sda
# fdisk -l /dev/sdb

How Do I Mount /dev/sda1 NTFS Partition at /mnt/ntfs?

First, load the fuse driver, enter:
# modprobe fuse
Create a mount point, enter:
# mkdir /mnt/ntfs
To mount the ntfs partition, enter:
# mount -t ntfs-3g /dev/sda1 /mnt/ntfs
You can use regular Unix commands to copy or access the files:
$ df -h
$ mount
$ cd /mnt/ntfs
$ cp foo /tmp


How Do I Unmount NTFS Partition?

Type the following command:
# umount /mnt/ntfs

Migrating PostgreSQL files to new server

Install the latest minor release of the same PostgreSQL major version - e.g. if you were using 9.4.1 before, install 9.4.26. Make sure it's the same architecture - i.e. if you were using a 32-bit PostgreSQL before you must install 32-bit PostgreSQL now.

• Stop the service (postgresql) using the services control panel (services.msc).
• Path in services - "C:\Program Files\PostgreSQL\9\bin\pg_ctl.exe" runservice -N "postgresql-x64-9" -D "D:\PostgreSQL\9\data" -w do not
• Modify the configuration to the following with the sc command:  sc config postgresql-x64-9.4 binPath= "\"C:\Program Files\PostgreSQL\9.4\bin\pg_ctl.exe\" runservice -N \"postgresql-x64-9.4\" -D \"E:\pg_db\data\" -w"
• Delete %PROGRAMFILES%\PostgreSQL\9.4\data.
• Copy the old data directory to that location - copy C:\Program Files\PostgreSQL\9.4\data\ to E:\pg_db\data
• Get properties on the data directory and in the security tab recursively grant full control to NETWORKSERVICE or pgsql -  - bad permissions will prevent the database from starting
• Start the service using services.msc
• immediately set up backups.