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Interactive Ubuntu Bash

Objective

  • Run a docker container based on the ubuntu container image.
  • Open an interactive bash session on the container.

To-do

  • Run docker run -it ubuntu bash on your terminal.
    • The -i flag stands for --interactive, and makes the container keep the STDIN open for input.
    • The -t (or --tty) flag will allocate a pseudo-TTY to the container.
    • This should result in an interactive bash session inside the container.
  • Try running commands inside the container.
    • Running destructive commands (such as rm -rf /) is fine and will not affect the host OS.
    • If you run destructive commands, make sure you are actually inside the container first.

Gotchas

  • On windows, you will need to use winpty to handle the pseudo-TTY provided by Docker. You can do this by prefixing the command with winpty, so for example winpty docker run -it ubuntu bash.
    • It is recommended to use an alias for the docker command with winpty already prefixed. This can be done by adding alias docker="winpty docker" to ~/.profile, if using Git Bash.
    • Windows cmd and powershell also supports aliases, but it's up to the user to figure out how those are configured.

Expected output

$ docker run -it ubuntu bash
Unable to find image 'ubuntu:latest' locally
latest: Pulling from library/ubuntu
6cf436f81810: Pull complete
987088a85b96: Pull complete
b4624b3efe06: Pull complete
d42beb8ded59: Pull complete
Digest: sha256:7a47ccc3bbe8a451b500d2b53104868b46d60ee8f5b35a24b41a86077c650210
Status: Downloaded newer image for ubuntu:latest

root@c21f94b81220:/# ls
bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
root@c21f94b81220:/# exit

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03 - Exposing Nginx