Moxa UC-8410A-T-LX [59/86] Package management

UC-8410A Series Linux Software General Debian Package Usage

5-19

ATTENTION

When using an OpenVPN

-related application, you need to create a firewall policy.

On the server’s firewall, open UDP 1194 (default port).

If you are

using shorewall on both devices, add a new

VPN zone to represent tun0 and create a default policy for it.

This means adding something to the following files

in /etc/shorewall:

zone

interfaces

policy

Bear in mind that 90% of all connection prob

lems encountered by new OpenVPN users are firewall-related.

NOTE

Click the following links for more information on OpenVPN:

https://wiki.debian.org/OpenVPN

http://openvpn.net/

Package Management

In this section, we explain how you can quickly learn to install, remove, update, and search for software

packages using the

apt-get and apt-cache commands from the command line. Some useful commands

that will help you handle package management in Debian/Ubuntu based systems are listed in this section.

apt-get

The apt-get utility is a powerful and free package management command line program that is used with

Ubuntu’s APT (Advanced Packaging Tool) library to install new software packages, remove existing software

packages, upgrade existing software packages, and even upgrade the entire operating system.

apt-cache

The apt-cache command line tool is used to search for apt software package cache. That is, the tool is used

to search for software packages, collect package information, and search for which available packages are

ready for installation on Debian or Ubuntu based systems.

List All Available Packages

Use the following command to list all available packages:

moxa@Moxa:~$ sudo apt-cache pkgnames

Find Package Name and Software Description

To find the package name and description, use the “search” flag. Using “search” with apt-cache will display a

list of matched packages with short descriptions. For example, if you would like to find the description of

package “vim”, use the following command:

moxa@Moxa:~$ sudo apt-cache search vim

To find and list all packages starting with “vim”, use the following command:

moxa@Moxa:~$ sudo apt-cache pkgnames vim