Atomic Demo

gistfile1.txt

1. Cover Agenda - No slides, all demo
 1. Demo 1: Setting up RHEL Atomic
  a. Getting the qcow2 image from the customer portal
  b. Adding more disk space, fdisk / mkfs.xfs, fstab
  c. subscribe the host with subscription manager, list subs
  d. finish up demo 1 with a "rpm-ostree upgrade" , reboot into a configured environment
 2. Demo 2: Cover a basic httpd server Dockerfile - Non-Systemd
  a. Build the image
  b. run the image
  c. Typical Docker commands: Docker {ps, images, log, etc..}
  d. Show networking bridge, iptables
  e. Enter the namespace of the RHEL platform base image and look around
  f. test the image
 3. Demo 3: Links
  a. Build the image
  b. run the image
  c. test the image
 4. Demo 4: Show how to enter a namespace

Demo 1 Steps:
1. Show the link for the qcow:
   https://access.redhat.com/downloads/content/247/ver=/rhel---7/7/x86_64/product-downloads
   Go ahead and download it. Don't have to wait for it to finish.  go to ra-vms to finish.  in /root/atomic
2. extract the qcow2 image and copy it over to /var/lib/libvirt
   xz -d rhel-atomic-host-standard.qcow2.xz
   cp rhel-atomic-host-standard.qcow2 /var/lib/libvirt/images/new-atomic.qcow2
3. Show the metadata / userdata, create iso.  copy iso over.
   cat user-data
   cat meta-data
   genisoimage -output atomic0-cidata.iso -volid cidata -joliet -rock user-data meta-data
   cp atomic0-cidata.iso /var/lib/libvirt/images/
4. Create a new logical volume for /var/lib/docker
   lvcreate -L 15G -n new-atomic VM_vg
5. Switch over and show how to install the VM
   give name: new-atomic-scollier
   import existing disk image
   browse to new-atomic.qcow2
   change memory and CPUs
   Finish up and install the VM.
   virt-install --import --name new-atomic --ram 4096 --vcpus 2 --disk path=/var/lib/libvirt/images/new-atomic.qcow2,format=qcow2,bus=virtio --disk path=/var/lib/libvirt/images/atomic0-cidata.iso,device=cdrom --disk path=/dev/VM_vg/new-atomic,bus=virtio --network bridge=rabr --graphics vnc --force

virt-viewer new-atomic
Username: cloud-user
Password: atomic

6. Get the IP address and SSH in. When you SSH in, not how it works with pubkey.
7. Configure the storage
   sudo su -
   fdisk -l
   fdisk /dev/vdb
   mkfs.xfs /dev/vdb1
   blkid /dev/vdb1
   edit /etc/fstab
   UUID="d3e47b7d-7f8a-4e19-8c53-32c6199858b8" /var/lib/docker xfs defaults 1 1

8. Register with subscription manager
   yum repolist
   sudo subscription-manager register --username rhn-engineering-scollier
   sudo subscription-manager attach --pool 8a85f9823e3d5e43013e3dce8ff306fd
   sudo subscription-manager list --available
   yum repolist

9. Update the system
   sudo rpm-ostree upgrade

10. Reboot.  After reboot show the storage on /var/lib/docker.  Switch over to an Atomic host that already has images downloaded.

Demo 2 Steps:

1. systemctl status docker -l
   rpm -qd docker
   docker # to show options
   man docker save
   docker ps
   docker images

2. Explore the httpd Dockerfile
   /root/docker-image-examples/rhel-httpd
   cat Dockerfile
   Cover all the lines in it
   Cover the script run-apache.sh

3. Build run the image
   docker build -t test/apachenew .
   docker images
   docker run -t -d -p 80:80 test/apachenew
   docker ps   # show ports
   docker top <uuid>
   curl http://localhost

Demo 3 Steps:

1. Show how to use links
docker run -dt --name websvr apache/demo
docker run -it --link websvr:web --name test fedora:20 /bin/bash
env | grep -i web
ip a
curl http://<IP OF OTHER CONTAINER>
Exit the container

Demo 4 Steps:
1. Launch the fedora/redis image
   docker run -dt fedora/redis

2. Show how to enter the namespace
docker inspect --format '{{ .State.Pid }}' 6a6
nsenter -m -u -n -i -p -t 20755 bash
ps aux
ip a
hostname
iptables


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