11.6. 配置具有资源和资源操作默认值的高可用性集群

步骤

1. 创建包含以下内容的 playbook 文件，如 ~/playbook.yml ：

   ---
   - name: Create a high availability cluster that defines resource and resource operation defaults
     hosts: node1 node2
     roles:
       - rhel-system-roles.ha_cluster
     vars:
       ha_cluster_cluster_name: my-new-cluster
       ha_cluster_hacluster_password: <password>
       ha_cluster_manage_firewall: true
       ha_cluster_manage_selinux: true
       # Set a different resource-stickiness value during
       # and outside work hours. This allows resources to
       # automatically move back to their most
       # preferred hosts, but at a time that
       # does not interfere with business activities.
       ha_cluster_resource_defaults:
         meta_attrs:
           - id: core-hours
             rule: date-spec hours=9-16 weekdays=1-5
             score: 2
             attrs:
               - name: resource-stickiness
                 value: INFINITY
           - id: after-hours
             score: 1
             attrs:
               - name: resource-stickiness
                 value: 0
       # Default the timeout on all 10-second-interval
       # monitor actions on IPaddr2 resources to 8 seconds.
       ha_cluster_resource_operation_defaults:
         meta_attrs:
           - rule: resource ::IPaddr2 and op monitor interval=10s
             score: INFINITY
             attrs:
               - name: timeout
                 value: 8s

   这个示例 playbook 文件配置一个运行 firewalld 和 selinux 服务的集群。集群包括资源和资源操作默认值。

   为生产环境创建 playbook 文件时，vault 会加密密码，如在 使用 Ansible Vault 加密内容 中所述。

2. 验证 playbook 语法：

   $ ansible-playbook --syntax-check ~/playbook.yml

   请注意，这个命令只验证语法，不会防止错误但有效的配置。

3. 运行 playbook：

   $ ansible-playbook ~/playbook.yml