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<!DOCTYPE html>
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<title>Docker Engine ή Docker</title>
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</head>
<body class="article toc2 toc-right">
<div id="header">
<div id="toc" class="toc2">
<div id="toctitle">Πίνακας περιεχομένων</div>
<ul class="sectlevel1">
<li><a href="#_docker_engine_ή_docker">1. Docker Engine ή Docker</a>
<ul class="sectlevel2">
<li><a href="#_τι_είναι_το_docker">1.1. Τι είναι το Docker<br></a></li>
<li><a href="#_container">1.2. Container</a></li>
<li><a href="#_docker_images">1.3. Docker Images</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="content">
<div class="paragraph">
<p><br></p>
</div>
<!-- toc disabled -->
<div class="sect1">
<h2 id="_docker_engine_ή_docker">1. Docker Engine ή Docker</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_τι_είναι_το_docker">1.1. Τι είναι το Docker<br></h3>
<div class="paragraph text-justify">
<p>To Docker είναι μια πλατφόρμα λογισμικού ανοιχτού κώδικα που υλοποιεί εικονικοποίηση (virtualization) σε επίπεδο λειτουργικού Συστήματος.
Ουσιαστικά το Docker προσφέρει την δυνατότητα της άμεσης ανάπτυξης εφαρμογών στα Container του χωρίς την ανάγκη εγκατάστασης αυτών στον υπολογιστή μας. Το Docker χρησιμοποιεί στοιχεία από το λειτουργικό σύστημα που είναι εγκατεστημένο. Λειτουργεί ως μία υπηρεσία στον υπολογιστή μας που χρησιμοποιεί πόρους μόνο όταν τους χρειάζεται αρκεί να τρέχει σε λειτουργικό σύστημα Linux.
Αυτή είναι και μία από τις μεγαλύτερες διαφορές του με μία εικονική μηχανή (virtual machine) που δεσμεύει μόνιμα πόρους ανεξάρτητα από το ποσοστό λειτουργίας της (εικόνα 1).
Προσφέρει και αυτό πλήρη απομόνωση μεταξύ των εφαρμογών που υπάρχουν στα Container εξασφαλίζοντας έτσι ασφάλεια παρόμοια με αυτή των συμβατικών εικονικών μηχανών.</p>
</div>
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</div>
<div class="sect2">
<h3 id="_container">1.2. Container</h3>
<div class="paragraph text-justify">
<p>Το Container είναι είναι ένα πακέτο λογισμικού που προέρχονται από Docker images και σε συνδυασμό με ρυθμίσεις που κάνει ο προγραμματιστής δημιουργείται ένα Container.</p>
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<div class="sect2">
<h3 id="_docker_images">1.3. Docker Images</h3>
<div class="paragraph text-justify">
<p>Τα Docker images είναι έτοιμα Container ή βάσεις για να δημιουργήσουμε τα δικά μας containers και υπάρχει μεγάλη ποικιλία τους στο διαδίκτυο. Ο επίσημος χώρος αποθήκευσης των Docker images είναι το Docker Hub αλλά υπάρχουν και πολλά άλλα ανεπίσημα, αυτοί οι χώροι αποθήκευσης των images ονομάζονται Docker registries.<br>
Όταν ο προγραμματιστής εκτελέσει την εντολή δημιουργίας Container, το Docker θα αναζητήσει το image πρώτα τοπικά στον υπολογιστή που εκτελείται εάν υπάρχει, εάν δεν το βρει θα το αναζητήσει στο registry που έχουμε δηλώσει, το Docker Hub είναι το προκαθορισμένο registry του Docker κατά την εγκατάσταση του. Τέλος αφού βρεθεί με επιτυχία το image που αναζητήθηκε θα το κατεβάσει από το registry στον υπολογιστή μας και θα δημιουργήσει το Container (εικόνα 2).</p>
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<div class="paragraph">
<p>Το Docker δίνει την δυνατότητα να κατεβούν από το registry τοπικά στον υπολογιστή images χωρίς την δημιουργία Container (Docker pull), αλλά και να ανεβούν στο registry τροποποιημένα από προγραμματιστές images (Docker push).</p>
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<p><br>
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<br></p>
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<p><strong class="big">To be finished &#8230;&#8203;.</strong><br></p>
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