Clear Containers Hands On

Clear Containers Hands On.md

Clear Containers Hands On

For people in the meetup to try the Clear Containers hands on exercise on their own

Setup

You can try the hands on either in a VM using ciao-down or directly on your host system

Using ciao-down

First setup a clear containers virtual machine on Ubuntu/fedora using the instructions here https://github.com/01org/cc-oci-runtime/blob/master/documentation/Quickstart-Clear-Containers-in-a-Ubuntu-VM.md

Setup your host system

If you want to try clear containers on bare metal, you choose to directly install clear containers on your host system directly

Ubuntu: https://github.com/01org/cc-oci-runtime/blob/master/documentation/Installing-Clear-Containers-on-Ubuntu.md Centos: https://github.com/01org/cc-oci-runtime/blob/master/documentation/Installing-Clear-Containers-on-Centos-7.md

Setup terminals

Then setup three connections into the virtual machine

• Open 3 terminal sessions
• ciao-down connect or ssh in all three of these terminals will get you inside the VM

Demo 1. Showing inter connectivity between two clear containers

0. Check that clear containers has been installed.

   systemctl status docker
   

   This will show you default runtime is cor. Which the clear container runtime

1. In Terminal 1, run an alpine continer

   docker run -it alpine sh
   

2. In terminal 2, run a debian container

   docker run -it debian bash
   

3. Get the IP Addresses of each container in the terminal

   ip a
   

4. Ping one container from the other

5. On terminal 3

   ps auxw | grep qemu
   

   This will give you all the details of the qemu invocation

6. On terminal 3

   docker network inspect bridge
   

This will give you the IP and MACs as docker setup for these containers. They will match the information you saw in step 3

7. Cleanup

Exit from containers in terminal 1 and 2 using exit

Demo 2: Scaling ngnix using docker swarm and clear containers

1. In Terminal 1

   docker swarm init
   docker service create --name testswarm --replicas 1 --publish 8080:80 nginx /bin/bash -c "hostname > /usr/share/nginx/html/hostname; nginx -g \"daemon off;\""
   docker service ls
   

Note: Wait till the service is up and running

2. In terminal 2

   unset http_proxy
   curl 127.0.0.1:8080/hostname
   curl 127.0.0.1:8080/hostname
   curl 127.0.0.1:8080/hostname
   

   You will see the same hostname reported back from the service

3. In terminal 1

   docker service scale testswarm=3
   docker service ls
   

Note: Wait till service ls show all replicas up and running

4. In terminal 2

   curl 127.0.0.1:8080/hostname
   curl 127.0.0.1:8080/hostname
   curl 127.0.0.1:8080/hostname
   

   Now you will see 3 different hostnames as the load gets balanced across the three replicas

   You can scale it up more and see this continue

5. Inspect the service

   docker service inspect
   

6. To cleanup

   docker swarm leave --force
   

Note: If the swarm exercise does not work downgrade docker to 1.12.1