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| − | Podemos modificar una imagen existente y guardarla con un nombre diferente:
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| − | <syntaxhighlight lang="sh">
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| − | # docker run -it ubuntu bash
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| − | root@d66f7a3268e6:/#
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| − | </syntaxhighlight>
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| − | Fijaros en que el prompt del interprete de ordenes ha cambiado e indica el numero que identifica de manera unica al contenedor que hemos lanzado. Este numero cambia para cada nueva instancia que lanzamos.
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| − | <syntaxhighlight lang="sh">
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| − | root@d66f7a3268e6:/# apt-get update
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| − | root@d66f7a3268e6:/# apt-get install apache2
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| − | apt-get install apache2
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| − | Reading package lists... Done
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| − | Building dependency tree
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| − | Reading state information... Done
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| − | The following additional packages will be installed:
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| − | apache2-bin apache2-data apache2-utils ...
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| − | The following NEW packages will be installed:
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| − | apache2 apache2-bin apache2-data apache2-utils ...
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| − | 0 upgraded, 57 newly installed, 0 to remove and 4 not upgraded.
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| − | Need to get 22.6 MB/22.6 MB of archives.
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| − | After this operation, 102 MB of additional disk space will be used.
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| − | Do you want to continue? [Y/n]
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| − | ...
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| − | root@d66f7a3268e6:/#
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| − | </syntaxhighlight>
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| − | Escribo 'Y' y pulso enter para comenzar la instalacion del servidor web apache2.
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| − | <syntaxhighlight lang="sh">
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| − | root@d66f7a3268e6:/# exit
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| − | </syntaxhighlight>
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| − | <syntaxhighlight lang="sh">
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| − | # docker commit -m "Imagen de ubuntu con apache2" -a "profe" d66f7a3268e6 ubuntu/apache2
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| − | sha256:b68ef77405104a6ea2de6fde986a519a2fc9710b26d9ae8ec2553f5050c51fd3
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| − | </syntaxhighlight>
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| − | <syntaxhighlight lang="sh">
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| − | # docker images
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| − | REPOSITORY TAG IMAGE ID CREATED SIZE
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| − | ubuntu/apache2 latest b68ef7740510 36 seconds ago 260MB
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| − | </syntaxhighlight>
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| − | <syntaxhighlight lang="sh">
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| − | # docker run -it -p 8888:80 ubuntu/apache2
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| − | # service apache2 start
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| − | * Starting Apache httpd web server apache2 AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
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| − | *
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| − | </syntaxhighlight>
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| − | Y ahora si abro un navegador web al localhost al puerto 8888, me aparece la pagina que indica que apache esta funcionando correctamente.
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