22.5. 使用资源限制配置高可用性集群

流程

1. 创建一个指定集群中节点的清单文件，如 为 ha_cluster 系统角色指定一个清单 中所述

2. 创建一个 playbook 文件，如 new-cluster.yml。

   注意

   在为生产环境创建 playbook 文件时，建议您用 vault 加密密码，如 使用 Ansible Vault 加密内容 中所述。

   以下示例 playbook 文件配置了一个集群，其中包含资源位置限制、资源 colocation 约束、资源顺序限制和资源票据限制。

   - hosts: node1 node2
     vars:
       ha_cluster_cluster_name: my-new-cluster
       ha_cluster_hacluster_password: password
       # In order to use constraints, we need resources the constraints will apply
       # to.
       ha_cluster_resource_primitives:
         - id: xvm-fencing
           agent: 'stonith:fence_xvm'
           instance_attrs:
             - attrs:
                 - name: pcmk_host_list
                   value: node1 node2
         - id: dummy-1
           agent: 'ocf:pacemaker:Dummy'
         - id: dummy-2
           agent: 'ocf:pacemaker:Dummy'
         - id: dummy-3
           agent: 'ocf:pacemaker:Dummy'
         - id: dummy-4
           agent: 'ocf:pacemaker:Dummy'
         - id: dummy-5
           agent: 'ocf:pacemaker:Dummy'
         - id: dummy-6
           agent: 'ocf:pacemaker:Dummy'
       # location constraints
       ha_cluster_constraints_location:
         # resource ID and node name
         - resource:
             id: dummy-1
           node: node1
           options:
             - name: score
               value: 20
         # resource pattern and node name
         - resource:
             pattern: dummy-\d+
           node: node1
           options:
             - name: score
               value: 10
         # resource ID and rule
         - resource:
             id: dummy-2
           rule: '#uname eq node2 and date in_range 2022-01-01 to 2022-02-28'
         # resource pattern and rule
         - resource:
             pattern: dummy-\d+
           rule: node-type eq weekend and date-spec weekdays=6-7
       # colocation constraints
       ha_cluster_constraints_colocation:
         # simple constraint
         - resource_leader:
             id: dummy-3
           resource_follower:
             id: dummy-4
           options:
             - name: score
               value: -5
         # set constraint
         - resource_sets:
             - resource_ids:
                 - dummy-1
                 - dummy-2
             - resource_ids:
                 - dummy-5
                 - dummy-6
               options:
                 - name: sequential
                   value: "false"
           options:
             - name: score
               value: 20
       # order constraints
       ha_cluster_constraints_order:
         # simple constraint
         - resource_first:
             id: dummy-1
           resource_then:
             id: dummy-6
           options:
             - name: symmetrical
               value: "false"
         # set constraint
         - resource_sets:
             - resource_ids:
                 - dummy-1
                 - dummy-2
               options:
                 - name: require-all
                   value: "false"
                 - name: sequential
                   value: "false"
             - resource_ids:
                 - dummy-3
             - resource_ids:
                 - dummy-4
                 - dummy-5
               options:
                 - name: sequential
                   value: "false"
       # ticket constraints
       ha_cluster_constraints_ticket:
         # simple constraint
         - resource:
             id: dummy-1
           ticket: ticket1
           options:
             - name: loss-policy
               value: stop
         # set constraint
         - resource_sets:
             - resource_ids:
                 - dummy-3
                 - dummy-4
                 - dummy-5
           ticket: ticket2
           options:
             - name: loss-policy
               value: fence
   
     roles:
       - linux-system-roles.ha_cluster

3. 保存该文件。

4. 运行 playbook，指定在第 1 步中创建的清单文件清单的路径。

   # ansible-playbook -i inventory new-cluster.yml