Tags
https://www.hanselminutes.com/784/doing-open-source-with-brian-douglas
Play With Docker #
A handy way to try weird things in docker is using play-with-docker. You get a four hour session for free, after four hours everything will be deleted, but you can start a new session.
Installing Docker on Linux
Installing on Ubuntu.
wget -qO- https://get.docker.com/ | sh
Running Docker commands without sudo
In order to run docker commands without using sudo you need to add docker to your group.
sudo usermod -aG docker ubuntu
Architecture and Theory #
Container - Isolated area of an OS with resource usage limits applied.
Namespaces and Control Groups are hard, which is why containers were unusable by mortals before docker.
Namespaces #
Isolation
Each container looks and feels like a regular OS. It has its own eth0, users, kernel. These are completely isolated from every other container running on the system.
Namespaces are analogous to what Hypervisors do on hardware.
- Process ID (pid)
- Network (net)
- Filesystem/mount (mnt)
- Inter-proc comms (ipc)
- UTS (uts)
- User (usr)
Control Groups #
Resource usage limits