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How to build a centos image which contains DC/OS 1.8.x

Here is the advanced DC/OS 1.8 installation guide.

See [Advanced DC/OS Installation Guide] (https://dcos.io/docs/1.8/administration/installing/custom/advanced/) See [Install Docker on CentOS] (https://dcos.io/docs/1.8/administration/installing/custom/system-requirements/install-docker-centos/) See [Adding agent nodes] (https://dcos.io/docs/1.8/administration/installing/custom/add-a-node/)

Create a centos image using DIB following the steps outlined in DC/OS installation guide.

  1. Install and configure docker in chroot.
  2. Install system requirements in chroot.
  3. Download dcos_generate_config.sh outside chroot. This file will be used to run dcos_generate_config.sh --genconf to generate config files on the node during magnum cluster creation.
  4. Some configuration changes are required for DC/OS, i.e disabling the firewalld and adding the group named nogroup. See comments in the script file.

Use the centos image to build a DC/OS cluster. Command: magnum cluster-template-create magnum cluster-create

After all the instances with centos image are created.

  1. Pass parameters to config.yaml with magnum cluster template properties.
  2. Run dcos_generate_config.sh --genconf to generate config files.
  3. Run dcos_install.sh master on master node and dcos_install.sh slave on slave node.

If we want to scale the DC/OS cluster. Command: magnum cluster-update

The same steps as cluster creation.

  1. Create new instances, generate config files on them and install.
  2. Or delete those agent nodes where containers are not running.

How to use magnum dcos coe

We are assuming that magnum has been installed and the magnum path is /opt/stack/magnum.

  1. Copy dcos magnum coe source code $ mv -r /opt/stack/magnum/contrib/drivers/dcos_centos_v1 /opt/stack/magnum/magnum/drivers/ $ mv /opt/stack/magnum/contrib/drivers/common/dcos_* /opt/stack/magnum/magnum/drivers/common/ $ cd /opt/stack/magnum $ sudo python setup.py install

  2. Add driver in setup.cfg dcos_centos_v1 = magnum.drivers.dcos_centos_v1.driver:Driver

  3. Restart your magnum services.

  4. Prepare centos image with elements dcos and docker installed See how to build a centos image in /opt/stack/magnum/magnum/drivers/dcos_centos_v1/image/README.md

  5. Create glance image $ openstack image create centos-7-dcos.qcow2
    --public
    --disk-format=qcow2
    --container-format=bare
    --property os_distro=centos
    --file=centos-7-dcos.qcow2

  6. Create magnum cluster template Configure DC/OS cluster with --labels See https://dcos.io/docs/1.8/administration/installing/custom/configuration-parameters/ $ magnum cluster-template-create --name dcos-cluster-template
    --image-id centos-7-dcos.qcow2
    --keypair-id testkey
    --external-network-id public
    --dns-nameserver 8.8.8.8
    --flavor-id m1.medium
    --labels oauth_enabled=false
    --coe dcos

    Here is an example to specify the overlay network in DC/OS, 'dcos_overlay_network' should be json string format. $ magnum cluster-template-create --name dcos-cluster-template
    --image-id centos-7-dcos.qcow2
    --keypair-id testkey
    --external-network-id public
    --dns-nameserver 8.8.8.8
    --flavor-id m1.medium
    --labels oauth_enabled=false
    --labels dcos_overlay_enable='true'
    --labels dcos_overlay_config_attempts='6'
    --labels dcos_overlay_mtu='9001'
    --labels dcos_overlay_network='{"vtep_subnet": "44.128.0.0/20",
    "vtep_mac_oui": "70:B3:D5:00:00:00","overlays":
    [{"name": "dcos","subnet": "9.0.0.0/8","prefix": 26}]}'
    --coe dcos

  7. Create magnum cluster $ magnum cluster-create --name dcos-cluster --cluster-template dcos-cluster-template --node-count 1

  8. You need to wait for a while after magnum cluster creation completed to make DC/OS web interface accessible.