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packer-image.md

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Create the Bioconductor image

There are two possibilities to build image directly from your local machine or using Tmux on VM.

Image producer should set image status to shared, otherwise not shown in customer image list. If status set to public, then share/accept action is not required.

Initialize image directly from your Local machine

Install Openstack CLI and Packer

OpenSstack CLI and Parser are required to build an image.

Packer version

packer --version
1.4.2

SSH key for provisioning

Create SSH key without passphrase:

ssh-keygen -b 2048 -t rsa -f ~/.ssh/packer_id_rsa -N ""

Add the key to Openstack

openstack keypair create --public-key ~/.ssh/packer_id_rsa.pub packer-key

Prepare Template

  • Clone project and change directory to ./install

  • You can use already downloaded installation files in directory ./install/files instead of downloading them during cloud init again

  • Use OpenStack CLI to obtain required data to full fill packer_template.JSON

    • ssh_keypair_name - string from Instances -> Key Pairs openstack keypair list
    • ssh_private_key_file - relative path to the private key which mathes public key from ssh_keypair_name
    • floating_ip address - ID of Public IP address from Network -> Floating IPs openstack floating ip list
    • ssh_username account - login used for SSH provisioning (for Debian typically debian)
    • source_image - source image ID openstack image list
    • flavor - Flavor ID openstack flavor list

  • After succesfull build installation logs are available in local directory ./install/logs

Remove known_hosts record from previous build before connecting

ssh-keygen -f "/root/.ssh/known_hosts" -R "<Floating IP>"

Build an Image

Prepared template is used to build VM. Provisioning is used to set all required settings. Debug option is used in this example:

### Verify syntax
packer validate packer_template.JSON
# Build using debug parameter
packer build -debug packer_template.JSON

Rename Previous Image

openstack image set --name <imageName> <imageID>

Delete an Image

# Check images to delete
openstack image list | grep bioconductor
| b97137f6-7b35-477d-9fa0-3f84031803b9 | debian-9-x86_64_bioconductor                | active |
# Delete selected image using ID
openstack image delete b97137f6-7b35-477d-9fa0-3f84031803b9

Initialize Image using prepared VM with Packer installed

  • Check Rules in Security Group if containing "Permit SSH". Add new rule for SSH if missing:
ROUTER_ID=$(openstack router list -c ID -f value);
ROUTER_IP=$(openstack router show -f value -c external_gateway_info $ROUTER_ID |tr -d '"'| sed -rn 's/.*ip_address: ([0-9\.]+).*/\1/p');
SEC_GROUP=$(openstack security group list -c ID -f value);
openstack security group rule create --description "Permit SSH" --remote-ip ${ROUTER_IP}/32 --protocol tcp --dst-port 22 --ingress $SEC_GROUP
  • Login to prepared VM builded using template packer_template.JSON.sample
  • Open Tmux session tmux or attach to it tmux attach
  • Check used ID inside the template packer_template.JSON
  • If private repository, then check private/public keys
  • Start building image: sleep 80; packer build packer_template.JSON
  • Leave Tmux session (Ctrl+B D), not closing the session using Ctrl+D
  • Logout from VM
  • Disassociate a Floating IP from an instance

Share an Image

Image Producer

  • Get ID of Image to Share
openstack image list
  • Share an Image
openstack image set --shared <image ID>
openstack image add project <image ID> <project ID to share image to>
  • List of Shared Images
openstack image list --shared
  • Unshare an Image
openstack image remove project <image ID> <project ID to unshare image from>

Image Consumer

  • Accept a Shared Image
openstack image member list <image ID>
openstack image set --accept <image ID>