# OpenStack Provisioning This repository contains playbooks and Heat templates to provision OpenStack resources (servers, networking, volumes, security groups, etc.). The result is an environment ready for openshift-ansible. ## Dependencies for localhost (ansible control/admin node) * [Ansible 2.3](https://pypi.python.org/pypi/ansible) * [Ansible-galaxy](https://pypi.python.org/pypi/ansible-galaxy-local-deps) * [jinja2](http://jinja.pocoo.org/docs/2.9/) * [shade](https://pypi.python.org/pypi/shade) * python-jmespath / [jmespath](https://pypi.python.org/pypi/jmespath) * python-dns / [dnspython](https://pypi.python.org/pypi/dnspython) * Become (sudo) is not required. ### Optional Dependencies for localhost **Note**: When using rhel images, `rhel-7-server-openstack-10-rpms` repository is required in order to install these packages. * `python-openstackclient` * `python-heatclient` ## Dependencies for OpenStack hosted cluster nodes (servers) There are no additional dependencies for the cluster nodes. Required configuration steps are done by Heat given a specific user data config that normally should not be changed. ## Required galaxy modules In order to pull in external dependencies for DNS configuration steps, the following commads need to be executed: ansible-galaxy install \ -r openshift-ansible-contrib/playbooks/provisioning/openstack/galaxy-requirements.yaml \ -p openshift-ansible-contrib/roles Alternatively you can install directly from github: ansible-galaxy install git+https://github.com/redhat-cop/infra-ansible,master \ -p openshift-ansible-contrib/roles Notes: * This assumes we're in the directory that contains the clonned openshift-ansible-contrib repo in its root path. * When trying to install a different version, the previous one must be removed first (`infra-ansible` directory from [roles](https://github.com/openshift/openshift-ansible-contrib/tree/master/roles)). Otherwise, even if there are differences between the two versions, installation of the newer version is skipped. ## What does it do * Create Nova servers with floating IP addresses attached * Assigns Cinder volumes to the servers * Set up an `openshift` user with sudo privileges * Optionally attach Red Hat subscriptions * Sets up a bind-based DNS server or configures the cluster servers to use an external DNS server. * Supports mixed in-stack/external DNS servers for dynamic updates. * When deploying more than one master, sets up a HAproxy server ## Set up ### Copy the sample inventory cp -r openshift-ansible-contrib/playbooks/provisioning/openstack/sample-inventory inventory ### Copy ansible config cp openshift-ansible-contrib/playbooks/provisioning/openstack/sample-inventory/ansible.cfg ansible.cfg ### Update `inventory/group_vars/all.yml` #### DNS configuration variables Pay special attention to the values in the first paragraph -- these will depend on your OpenStack environment. Note that the provsisioning playbooks update the original Neutron subnet created with the Heat stack to point to the configured DNS servers. So the provisioned cluster nodes will start using those natively as default nameservers. Technically, this allows to deploy OpenShift clusters without dnsmasq proxies. The `env_id` and `public_dns_domain` will form the cluster's DNS domain all your servers will be under. With the default values, this will be `openshift.example.com`. For workloads, the default subdomain is 'apps'. That sudomain can be set as well by the `openshift_app_domain` variable in the inventory. The `openstack__hostname` is a set of variables used for customising hostnames of servers with a given role. When such a variable stays commented, default hostname (usually the role name) is used. The `public_dns_nameservers` is a list of DNS servers accessible from all the created Nova servers. These will be serving as your DNS forwarders for external FQDNs that do not belong to the cluster's DNS domain and its subdomains. The `openshift_use_dnsmasq` controls either dnsmasq is deployed or not. By default, dnsmasq is deployed and comes as the hosts' /etc/resolv.conf file first nameserver entry that points to the local host instance of the dnsmasq daemon that in turn proxies DNS requests to the authoritative DNS server. When Network Manager is enabled for provisioned cluster nodes, which is normally the case, you should not change the defaults and always deploy dnsmasq. `external_nsupdate_keys` describes an external authoritative DNS server(s) processing dynamic records updates in the public and private cluster views: external_nsupdate_keys: public: key_secret: key_algorithm: 'hmac-md5' key_name: 'update-key' server: private: key_secret: key_algorithm: 'hmac-sha256' server: Here, for the public view section, we specified another key algorithm and optional `key_name`, which normally defaults to the cluster's DNS domain. This just illustrates a compatibility mode with a DNS service deployed by OpenShift on OSP10 reference architecture, and used in a mixed mode with another external DNS server. Another example defines an external DNS server for the public view additionally to the in-stack DNS server used for the private view only: external_nsupdate_keys: public: key_secret: key_algorithm: 'hmac-sha256' server: Here, updates matching the public view will be hitting the given public server IP. While updates matching the private view will be sent to the auto evaluated in-stack DNS server's **public** IP. Note, for the in-stack DNS server, private view updates may be sent only via the public IP of the server. You can not send updates via the private IP yet. This forces the in-stack private server to have a floating IP. See also the [security notes](#security-notes) #### Other configuration variables `openstack_ssh_key` is a Nova keypair - you can see your keypairs with `openstack keypair list`. This guide assumes that its corresponding private key is `~/.ssh/openshift`, stored on the ansible admin (control) node. `openstack_default_image_name` is the default name of the Glance image the servers will use. You can see your images with `openstack image list`. In order to set a different image for a role, uncomment the line with the corresponding variable (e.g. `openstack_lb_image_name` for load balancer) and set its value to another available image name. `openstack_default_image_name` must stay defined as it is used as a default value for the rest of the roles. `openstack_default_flavor` is the default Nova flavor the servers will use. You can see your flavors with `openstack flavor list`. In order to set a different flavor for a role, uncomment the line with the corresponding variable (e.g. `openstack_lb_flavor` for load balancer) and set its value to another available flavor. `openstack_default_flavor` must stay defined as it is used as a default value for the rest of the roles. `openstack_external_network_name` is the name of the Neutron network providing external connectivity. It is often called `public`, `external` or `ext-net`. You can see your networks with `openstack network list`. `openstack_private_network_name` is the name of the private Neutron network providing admin/control access for ansible. It can be merged with other cluster networks, there are no special requirements for networking. The `openstack_num_masters`, `openstack_num_infra` and `openstack_num_nodes` values specify the number of Master, Infra and App nodes to create. The `openshift_cluster_node_labels` defines custom labels for your openshift cluster node groups. It currently supports app and infra node groups. The default value of this variable sets `region: primary` to app nodes and `region: infra` to infra nodes. An example of setting a customised label: ``` openshift_cluster_node_labels: app: mylabel: myvalue ``` The `openstack_nodes_to_remove` allows you to specify the numerical indexes of App nodes that should be removed; for example, ['0', '2'], The `docker_volume_size` is the default Docker volume size the servers will use. In order to set a different volume size for a role, uncomment the line with the corresponding variable (e. g. `docker_master_volume_size` for master) and change its value. `docker_volume_size` must stay defined as it is used as a default value for some of the servers (master, infra, app node). The rest of the roles (etcd, load balancer, dns) have their defaults hard-coded. **Note**: If the `ephemeral_volumes` is set to `true`, the `*_volume_size` variables will be ignored and the deployment will not create any cinder volumes. The `openstack_flat_secgrp`, controls Neutron security groups creation for Heat stacks. Set it to true, if you experience issues with sec group rules quotas. It trades security for number of rules, by sharing the same set of firewall rules for master, node, etcd and infra nodes. The `required_packages` variable also provides a list of the additional prerequisite packages to be installed before to deploy an OpenShift cluster. Those are ignored though, if the `manage_packages: False`. The `openstack_inventory` controls either a static inventory will be created after the cluster nodes provisioned on OpenStack cloud. Note, the fully dynamic inventory is yet to be supported, so the static inventory will be created anyway. The `openstack_inventory_path` points the directory to host the generated static inventory. It should point to the copied example inventory directory, otherwise ti creates a new one for you. #### Multi-master configuration Please refer to the official documentation for the [multi-master setup](https://docs.openshift.com/container-platform/3.6/install_config/install/advanced_install.html#multiple-masters) and define the corresponding [inventory variables](https://docs.openshift.com/container-platform/3.6/install_config/install/advanced_install.html#configuring-cluster-variables) in `inventory/group_vars/OSEv3.yml`. For example, given a load balancer node under the ansible group named `ext_lb`: openshift_master_cluster_method: native openshift_master_cluster_hostname: "{{ groups.ext_lb.0 }}" openshift_master_cluster_public_hostname: "{{ groups.ext_lb.0 }}" #### Security notes Configure required `*_ingress_cidr` variables to restrict public access to provisioned servers from your laptop (a /32 notation should be used) or your trusted network. The most important is the `node_ingress_cidr` that restricts public access to the deployed DNS server and cluster nodes' ephemeral ports range. Note, the command ``curl https://api.ipify.org`` helps fiding an external IP address of your box (the ansible admin node). There is also the `manage_packages` variable (defaults to True) you may want to turn off in order to speed up the provisioning tasks. This may be the case for development environments. When turned off, the servers will be provisioned omitting the ``yum update`` command. This brings security implications though, and is not recommended for production deployments. ### Configure the OpenShift parameters Finally, you need to update the DNS entry in `inventory/group_vars/OSEv3.yml` (look at `openshift_master_default_subdomain`). In addition, this is the place where you can customise your OpenShift installation for example by specifying the authentication. The full list of options is available in this sample inventory: https://github.com/openshift/openshift-ansible/blob/master/inventory/byo/hosts.ose.example Note, that in order to deploy OpenShift origin, you should update the following variables for the `inventory/group_vars/OSEv3.yml`, `all.yml`: deployment_type: origin openshift_deployment_type: "{{ deployment_type }}" ### Configure static inventory and access via a bastion node Example inventory variables: openstack_use_bastion: true bastion_ingress_cidr: "{{openstack_subnet_prefix}}.0/24" openstack_private_ssh_key: ~/.ssh/openshift openstack_inventory: static openstack_inventory_path: ../../../../inventory openstack_ssh_config_path: /tmp/ssh.config.openshift.ansible.openshift.example.com The `openstack_subnet_prefix` is the openstack private network for your cluster. And the `bastion_ingress_cidr` defines accepted range for SSH connections to nodes additionally to the `ssh_ingress_cidr`` (see the security notes above). The SSH config will be stored on the ansible control node by the gitven path. Ansible uses it automatically. To access the cluster nodes with that ssh config, use the `-F` prefix, f.e.: ssh -F /tmp/ssh.config.openshift.ansible.openshift.example.com master-0.openshift.example.com echo OK Note, relative paths will not work for the `openstack_ssh_config_path`, but it works for the `openstack_private_ssh_key` and `openstack_inventory_path`. In this guide, the latter points to the current directory, where you run ansible commands from. To verify nodes connectivity, use the command: ansible -v -i inventory/hosts -m ping all If something is broken, double-check the inventory variables, paths and the generated `/hosts` and `openstack_ssh_config_path` files. The `inventory: dynamic` can be used instead to access cluster nodes directly via floating IPs. In this mode you can not use a bastion node and should specify the dynamic inventory file in your ansible commands , like `-i openstack.py`. ## Deployment ### Run the playbook Assuming your OpenStack (Keystone) credentials are in the `keystonerc` this is how you stat the provisioning process from your ansible control node: . keystonerc ansible-playbook openshift-ansible-contrib/playbooks/provisioning/openstack/provision.yaml Note, here you start with an empty inventory. The static inventory will be populated with data so you can omit providing additional arguments for future ansible commands. If bastion enabled, the generates SSH config must be applied for ansible. Otherwise, it is auto included by the previous step. In order to execute it as a separate playbook, use the following command: ansible-playbook openshift-ansible-contrib/playbooks/provisioning/openstack/post-provision-openstack.yml The first infra node then becomes a bastion node as well and proxies access for future ansible commands. The post-provision step also configures Satellite, if requested, and DNS server, and ensures other OpenShift requirements to be met. ### Running Custom Post-Provision Actions If you'd like to run post-provision actions, you can do so by creating a custom playbook. Here's one example that adds additional YUM repositories: ``` --- - hosts: app tasks: # enable EPL - name: Add repository yum_repository: name: epel description: EPEL YUM repo baseurl: https://download.fedoraproject.org/pub/epel/$releasever/$basearch/ ``` This example runs against app nodes. The list of options include: - cluster_hosts (all hosts: app, infra, masters, dns, lb) - OSEv3 (app, infra, masters) - app - dns - masters - infra_hosts After writing your custom playbook, run it like this: ``` ansible-playbook --private-key ~/.ssh/openshift -i myinventory/ custom-playbook.yaml ``` If you'd like to limit the run to one particular host, you can do so as follows: ``` ansible-playbook --private-key ~/.ssh/openshift -i myinventory/ custom-playbook.yaml -l app-node-0.openshift.example.com ``` ### Install OpenShift Once it succeeds, you can install openshift by running: ansible-playbook openshift-ansible/playbooks/byo/config.yml ### Access UI OpenShift UI may be accessed via the 1st master node FQDN, port 8443. When using a bastion, you may want to make an SSH tunnel from your control node to access UI on the `https://localhost:8443`, with this inventory variable: openshift_ui_ssh_tunnel: True Note, this requires sudo rights on the ansible control node and an absolute path for the `openstack_private_ssh_key`. You should also update the control node's `/etc/hosts`: 127.0.0.1 master-0.openshift.example.com In order to access UI, the ssh-tunnel service will be created and started on the control node. Make sure to remove these changes and the service manually, when not needed anymore. ## License As the rest of the openshift-ansible-contrib repository, the code here is licensed under Apache 2.