Ansible 打印创建的主机

Question

我编写了一个创建多个 VM 的 Ansible Playbook。剧本分为两个文件。 Main.yaml 和 vars.yaml。它创建了 VM，并且看起来运行良好。我没有收到任何错误，所以我假设它已成功将创建的主机添加到清单中。我想检查创建的主机是否已添加到清单中。我如何 print/list 清单的主机？我的目标是运行稍后在创建的虚拟机上编写脚本。谢谢

**Main.yaml**
#########CREATING VM#########
---
- hosts: localhost
  vars:
    http_port: 80
max_clients: 200
  vars_files:
   - vars.yaml
  tasks:
  - name: create VM
    os_server:
      name: "{{ item.name }}"
      state: present
      image: "{{ item.image }}"
      boot_from_volume: True
      security_groups: ssh
      flavor: "{{ item.flavor }}"
      key_name: mykey
      region_name: "{{ lookup('env', 'OS_REGION_NAME') }}"
      nics:
        - net-name: private
      wait: yes
    register: instances
    with_items: "{{ instance_definitions }}"
 ############################################
  - name: whait 15 seconds
    pause: seconds=15
    when: instances.changed
######DEBUG#################################
  - name: display results
    debug:
      msg: "{{ item }}"
    with_items: "{{ instances.results }}"
############################################
  - name: Add new VM to ansible Inventory
    add_host:
      name: "{{ item.server.name}}"
      ansible_host: "{{item.server.public_v4}}"
      ansible_user: "{{ansible_user}}"
      ansible_ssh_common_args: -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no
      groups: just_created
    with_items: "{{ instances.results }}"



**vars.yaml**
---
  instance_definitions:
     - { name: Debian Jessie, image: Debian Jessie 8, flavor: c1.small, loginame: debian }
     - { name: Debian Stretch, image: Debian Stretch 9, flavor: c1.small, loginame: debian }

Answer 1

这就是 magic variables 的用途。

您的所有主机都将在列表中：

groups['just_created']

Answer 2

您可以使用剧本打印清单文件的内容：

- debug: msg="the hosts are is {{lookup('file', '/etc/ansible/hosts') }}"

或者，您可以使用命令行列出主机：

ansible --list-hosts all

或使用剧本中的此命令：

tasks:
  - name: list hosts
command: ansible --list-hosts all
register: hosts
  - debug:
    msg: "{{hosts.stdout_lines}}"

Answer 3

下面的示例说明了如何创建 in-memory 主机并列出它们。神奇的是add_hosts需要单独播放

---
 - name: adding host playbook
   hosts: localhost
   connection: local
   tasks:
   - name: add host to in-memory inventory
     add_host:
       name: awesome_host_name
       groups: in_memory

 - name: checking hosts
   hosts: in_memory
   connection: local
   gather_facts: false
   tasks:
     - debug: var=group_names
     - debug: msg="{{ inventory_hostname }}"
     - debug: var=hostvars[inventory_hostname]

Ansible 打印创建的主机

Ansible print created hosts

openstack

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ansible-inventory