OpenStack Orchestration (Heat) Templates
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5.3 KiB

OpenShift Origin Highly Available Environment

This nested heat stack deploys a highly-available OpenShift Origin environment.

Resources Deployed

  • 6 instances
    • Highly available OpenShift broker set (3)
    • OpenShift nodes (3)
  • 7 floating IPs (includes one for LBaaS VIP)
  • LBaaS, consisting of health monitor (HTTPS), pool, virtual IP (VIP)
  • Integrated BIND server on broker 1 for dynamic DNS updates

Deployment

   zone transferred to
    upstream DNS (IT)
              \          ----------------------
               \        /   mongo replica set  \
                \      /      ActiveMQ pool     \
               --\---------   ------------   ------------
               | BIND |   |   |          |   |          |
               --------   |---| broker 2 |---| broker 3 |
               | broker 1 |   |          |   |          |
               ------------   ------------   ------------
                           \       |          /
                            \      |         /
                            LBaaS agent (API) ---------------- developers
                            /      |       \
                           /       |        \
               ------------   ------------   ------------
               |          |   |          |   |          |
               |  node 1  |---|  node 2  |---|  node  3 | ---- application
               |          |   |          |   |          |         users
               ------------   ------------   ------------

Requirements

  • Neutron networking: one private and one public network
  • Compute quota for six VM instances
  • Pool of seven available floating IP addresses. Addresses will be created and assigned at deployment.
  • Load Balancer as a Server (LBaaS) configured. See neutron lbaas agent configuration section.
  • IP address of upstream (IT) DNS server for zone transfers

Files

These templates are Heat Orchestration Templates (HOT). Environment files are used to reduce CLI parameters and provide a way to reuse resources.

  • Templates
    • oso_ha_stack.yaml
    • oso_node_stack.yaml
  • Environments
    • oso_ha_env.yaml
    • oso_node_env.yaml

How to Deploy

  1. git clone https://github.com/openstack/heat-templates.git this repository

  2. Change to this directory

     cd heat-templates/openshift-origin/centos65/highly-available/
    
  3. Edit heat environment file oso_ha_env.yaml according to your environment.

  4. Launch highly available OpenShift stack

     openstack stack create openshift-ha-stack -t oso_ha_stack.yaml -e oso_ha_env.yaml
    
  5. Monitor progress. Options include:

  • tail -f /var/log/heat/heat-engine.log
  • tail -f /tmp/openshift.out
  • openstack stack list
  • openstack stack resource list openshift-ha-stack

Scaling: Adding Nodes

OpenShift nodes may be manually added as needed using the OpenShift node heat template.

  1. From directory heat-templates/openshift-origin/centos65/highly-available/ edit the heat environment file oso_node_env.yaml

  2. Launch node stack. This will deploy a single node server with attached cinder volume and floating IP address. Be sure to pass in the node hostname parameter to override the default.

     openstack stack create openshift-node -t oso_node_stack.yaml -e oso_node_env.yaml --parameter "node_hostname=node4"
    
  3. On broker1 add a DNS record for the new node server in /var/named/dynamic/<my_domain>.db. To force a zone transfer to the upstream DNS increment the serial number by 1 and run rndc freeze ; rndc thaw.

Additional configuration Steps

  1. Add brokers to LBaaS pool. On OpenStack:

     neutron lb-member-create --address <broker1_fixed_ip> --protocol-port 443 oso_broker_lb_pool
     neutron lb-member-create --address <broker2_fixed_ip> --protocol-port 443 oso_broker_lb_pool
     neutron lb-member-create --address <broker3_fixed_ip> --protocol-port 443 oso_broker_lb_pool
    
  2. Add session persistence to LBaaS virtual IP (VIP):

     neutron lb-vip-update oso_broker_vip --session-persistence type=dict type='SOURCE_IP'
    
  3. Update upstream DNS server to accept zone transfers from the OpenShift dynamic DNS. An example configuration would be to add a slave zone to /var/named.conf

     zone "<openshift_domain_name>" {
         type slave;
         file "slaves/<openshift_domain_name>.db";
         masters { <broker1_ip_address>; };
     };
    
    • If the upstream DNS configuration is not available a test client machine may be pointed to the broker 1 IP address (e.g. edit /etc/resolv.conf).
  4. Create districts. The following creates a small district and adds two nodes to the district.

     oo-admin-ctl-district -c create -n small_district -p small
     oo-admin-ctl-district -c add-node -n small_district -i <node1_hostname>
     oo-admin-ctl-district -c add-node -n small_district -i <node2_hostname>
    

Troubleshooting

  • oo-mco ping on a broker to verify nodes are registered
  • oo-diagnostics -v on a broker to run a comprehensive set of tests
  • oo-accept-node -v on a node
  • If LBaaS is not set up any broker hostname can be used temporarily as the developer and node API target. Be sure to edit /etc/openshift/node.conf.