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====== Basic Docker commands ======
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===== Running a Container =====

''docker run --name nginx-base -p 80:80 -p 443:443 nginx:latest'' \\
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===== Downloading a Container Image =====

''//docker pull nginx:latest//'' \\

<code>
root@hdcdev01:~# docker pull nginx:latest
latest: Pulling from library/nginx
Digest: sha256:943c25b4b66b332184d5ba6bb18234273551593016c0e0ae906bab111548239f
Status: Image is up to date for nginx:latest
docker.io/library/nginx:latest
root@hdcdev01:~#
</code>
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===== Creating a Container from an Image =====
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===== Starting a Container =====

''//docker start nginx-base//'' \\
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===== Listing Docker Containers =====

''//docker ps//'' lists all __running__ docker containers \\
<code>
root@hdcdev01:~# docker ps
CONTAINER ID   IMAGE                                 COMMAND                  CREATED       STATUS       PORTS                                      NAMES
4e7e0d9d7963   lscr.io/linuxserver/dokuwiki:latest   "/init"                  4 hours ago   Up 4 hours   0.0.0.0:80->80/tcp, 0.0.0.0:443->443/tcp   dokuwiki
dcc0e627c5b2   nginx:latest                          "/docker-entrypoint.…"   2 days ago    Up 2 days    0.0.0.0:81->80/tcp                         nginx-base
</code>
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''//docker ps -a//'' lists __all__ docker containers \\
<code>
root@hdcdev01:~# docker ps -a
CONTAINER ID   IMAGE                                 COMMAND                  CREATED       STATUS                    PORTS                                      NAMES
4e7e0d9d7963   lscr.io/linuxserver/dokuwiki:latest   "/init"                  4 hours ago   Up 4 hours                0.0.0.0:80->80/tcp, 0.0.0.0:443->443/tcp   dokuwiki
dcc0e627c5b2   nginx:latest                          "/docker-entrypoint.…"   2 days ago    Up 2 days                 0.0.0.0:81->80/tcp                         nginx-base
acf87a65ecda   lscr.io/linuxserver/dokuwiki          "/init"                  4 days ago    Exited (111) 4 days ago                                              agitated_rhodes
25ff71bdd9a3   httpd:2.4.54                          "httpd-foreground"       4 days ago    Created                                                              test1234
c2c01f546383   httpd:2.4.54                          "httpd-foreground"       4 days ago    Created                                                              test123
b6dd05c80f90   debian                                "bash"                   4 days ago    Exited (129) 4 days ago                                              distracted_goldwasser
ef0ab877942f   srv.world/debian-apache2              "/usr/sbin/apachectl…"   4 days ago    Exited (137) 4 days ago                                              sharp_curie
</code>
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===== Connecting to Docker Containers =====

''//docker exec -it <container id|name> <command>//'' \\
''//docker exec -it dcc0e627c5b2 bash//'' \\
''//docker exec -it nginx-base bash//'' \\
To exit the container, type ''//exit//'' at the command prompt within the container.
<code>
root@hdcdev01:~# docker exec -it dcc0e627c5b2 bash
root@dcc0e627c5b2:/# exit
exit
root@hdcdev01:~# 
root@hdcdev01:~# docker exec -it nginx-base bash
root@dcc0e627c5b2:/# exit
exit
root@hdcdev01:~#
</code>
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===== Copy files from/to Docker Container =====

Use the Docker ''cp'' command to copy files.

Copy a specific file //TO// the container:
  docker cp foo.txt container_id:/foo.txt

Copy a specific file //FROM// the container:
  docker cp container_id:/foo.txt foo.txt

Copy multiple files from //source// to the //target// folder:
  docker cp source/. container_id:/target
  docker cp container_id:/source/. target
  
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===== Backup Docker Container =====

<code>
root@hdcdev01:~/freeradius# docker container ls -a
CONTAINER ID   IMAGE         COMMAND                 CREATED        STATUS         PORTS                              NAMES
33e92ed82b82   freerad-ybk   "/bin/sh -c /init.sh"   15 hours ago   Up 4 seconds   0.0.0.0:1812-1813->1812-1813/udp   freerad-ybk
root@hdcdev01:~/freeradius#
</code>

<code>
root@hdcdev01:~/freeradius# docker commit -p 33e92ed82b82 freeradius-yubikey
sha256:3b9552a2de7c185310a5fd639781195ccc16b9cd2b544465783da0c6e58ddd7e
root@hdcdev01:~/freeradius#
</code>

<code>
root@hdcdev01:~/freeradius# docker save -o ~/freeradius-yubikey.tar freeradius-yubikey
root@hdcdev01:~/freeradius#
</code>
[[https://www.geeksforgeeks.org/backing-up-a-docker-container/]]