Comandos básicos en Docker
- Francisco Javier Huete
- Implantacion
- February 24, 2025
Índice
Para descargar imágenes desde los repositorios públicos de Docker se usa el comando docker pull.
debian@docker:~$ docker pull ubuntu:22.04
22.04: Pulling from library/ubuntu
6414378b6477: Pull complete
Digest: sha256:0e5e4a57c2499249aafc3b40fcd541e9a456aab7296681a3994d631587203f97
Status: Downloaded newer image for ubuntu:22.04
docker.io/library/ubuntu:22.04
debian@docker:~$ docker pull tomcat:9.0.70-jdk11
9.0.70-jdk11: Pulling from library/tomcat
6e3729cf69e0: Pull complete
96aa423488f0: Pull complete
7be0f5f0ccdf: Pull complete
2c7e543fcebc: Pull complete
6a4dee6d6ab0: Pull complete
59932727e86b: Pull complete
d52d77ccbc1b: Pull complete
Digest: sha256:ddcd9abc74193d31ce49ed2ec33d7440956e441c90ed636d8b2d34812572fc05
Status: Downloaded newer image for tomcat:9.0.70-jdk11
docker.io/library/tomcat:9.0.70-jdk11
debian@docker:~$ docker pull jenkins/jenkins:lts
lts: Pulling from jenkins/jenkins
0a96bdb82805: Pull complete
b5e2db483aae: Pull complete
72b137db2cdf: Pull complete
d0aac1e9e20c: Pull complete
c48e3974586c: Pull complete
d281eadf0ae3: Pull complete
be47ab5dc59d: Pull complete
c09c222384de: Pull complete
a91f2a3bb141: Pull complete
1a17773e6697: Pull complete
b535e1c5efef: Pull complete
3cfa79b75794: Pull complete
Digest: sha256:dc56634cc8fa476f36eba16d7db6c6bc1f5e3c7062432256738a008a339ee95c
Status: Downloaded newer image for jenkins/jenkins:lts
docker.io/jenkins/jenkins:lts
debian@docker:~$ docker pull php:8.3-apache
8.3-apache: Pulling from library/php
af302e5c37e9: Pull complete
05e004e38cd9: Pull complete
6c0335640eef: Pull complete
9228f3fa46c1: Pull complete
a4d4a5a93692: Pull complete
b0ddef6aec18: Pull complete
ac37b14f2c9c: Pull complete
f1a2b56ba197: Pull complete
f6c436b244b8: Pull complete
66ef6ef33f8b: Pull complete
8dbe7fe859d0: Pull complete
9bbe234e2909: Pull complete
bf2f883095aa: Pull complete
4f4fb700ef54: Pull complete
Digest: sha256:24ec61fdf4844c34f9a763df6a02a1938449ad1126a5535a64a83ed6188b8f2b
Status: Downloaded newer image for php:8.3-apache
docker.io/library/php:8.3-apache
Con el comando docker images se pueden listar las imágenes descargadas en el registro local.
debian@docker:~$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
jenkins/jenkins lts 44c1caefd796 5 days ago 468MB
php 8.3-apache 5e08b094a675 3 weeks ago 505MB
nextcloud latest 3fe93cf87aa0 4 weeks ago 1.27GB
nginx latest f876bfc1cc63 6 weeks ago 192MB
ubuntu 22.04 97271d29cb79 4 months ago 77.9MB
tomcat 9.0.70-jdk11 60c46b490690 2 years ago 468MB
A partir de una de estas imágenes se puede crear un contenedor.
debian@docker:~$ docker run -d --name php -p 8081:80 php:8.3-apache
6ed7fb3d3892ce637c903f9631f2a363cf11d82c2b0642033a35229be1ef616b
La opción -s del comando docker ps muestra el tamaño del fichero.
debian@docker:~$ docker ps -a -s
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES SIZE
6ed7fb3d3892 php:8.3-apache "docker-php-entrypoi…" 8 seconds ago Up 7 seconds 80/tcp php 2B (virtual 505MB)
A los contenedores se les pueden trasladar ficheros usando el comando docker cp. Para ello, se crea un fichero.
debian@docker:~$ nano info.php
A continuación se rellena.
<?php
echo phpinfo();
?>
Y se pasa al contenedor.
debian@docker:~$ docker cp info.php php:/var/www/html
Successfully copied 2.05kB to php:/var/www/html
Tras añadir el fichero, el tamaño del contenedor aumenta.
debian@docker:~$ docker ps -s
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES SIZE
4bdae5867ccc php:8.3-apache "docker-php-entrypoi…" 50 seconds ago Up 50 seconds 0.0.0.0:8081->80/tcp, [::]:8081->80/tcp php 27B (virtual 505MB)
Al acceder al puerto 8081 del servidor que aloja el contenedor se muestra el contenido que se ha copiado al servidor.