It delegates the actual installation and removal of packages to dpkg - low level core Debian Package tool. The first entry on each line - deb or deb-src represents the type of repository archives. These are the packages installed by default when using package managers like apt-get , aptitude , synaptic , etc The next section on the entry line is an URL of the repository from where the packages will be downloaded from. You can find the main list of Debian repositories from Debian Worldwide sources.
If you intend to track a release class then use the class name, if you want to track a Debian point release, use the code name. As we can see in the following sources.
If your sources. We will go through that in the next section of the article. If you also need the Backports, contrib, and non-free components, add buster-backports lines. For example, for Debian 10 Buster:. Users of Debian 9 Stretch or older releases will need to install the apt-transport-https package first.
Debian has a start-stop-daemon program that is invoked to stop, then restart running process if necessary during a package upgrade. If you have downloaded the files to your disk then after you have installed the packages, you can remove them from your system, e. Passing the --log -option to dpkg makes dpkg log status change updates and actions. It logs both the dpkg -invokation e. If you'd like to log all your dpkg invocations even those done using frontends like aptitude , you could add.
Be sure the created logfile gets rotated periodically. More details on dpkg logging can be found in the dpkg 1 manual page. Note that the results of those actions are not recorded in this file! Another way to record your actions is to run your package management session within the script 1 program. You can use cron-apt ; this tool updates the system at regular intervals using a cron job.
By default it just updates the package list and downloads new packages, but without installing them. Note: Automatic upgrade of packages is NOT recommended in testing or unstable systems as this might bring unexpected behaviour and remove packages without notice. If you have more than one Debian machine on your network, it is useful to use apt-cacher to keep all of your Debian systems up-to-date.
Of course, you can get the same benefit if you are already using a standard caching proxy and all your systems are configured to use it. The package manager for Debian and its derivatives is apt.
APT which stands for Advanced Package Tool is a set of tools for managing Debian packages, and therefore the applications installed on your Debian system. APT makes it possible to:. APT is capable of resolving dependency problems and retrieving requested packages from designated package repositories. It delegates the actual installation and removal of packages to dpkg. This file contains a list of the 'sources' from which packages can be obtained.
The entries in this file normally follow this format. The entries shown above are fictitious and should not be used. Below are the contents of this file when split into different sections:. Karim Buzdar holds a degree in telecommunication engineering and holds several sysadmin certifications.
As an IT engineer and technical author, he writes for various web sites. He blogs at LinuxWays. In Linux, the repository is a storage location hosted on remote servers from which the system retrieves and installs software and updates. This file and directory already contain some essential software repositories, known as standard repositories, but you may add other software repositories, as well. However, while adding the repositories in the sources. This article will help you understand what the sources.
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