Ansible：如何将角色并行部署到不同的主机

Question

我有下一个 main.yml，我想运行角色一个接一个但并行地用于不同的主机：例如，首先我想运行 "cluster-prerequisites" 在所有主机上并行角色，当它完成运行 "docker" 角色等..

- hosts: masters:private_agent:public_agent
  remote_user: "{{user}}"
  become: True
  serial: 1
  roles:
  - role: cluster_prerequisites

- hosts: bootstrap:masters:private_agent:public_agent
  remote_user: "{{user}}"
  become: True
  serial: 1
  roles:
  - role: docker

- hosts: bootstrap
  remote_user: "{{user}}"
  become: True
  serial: 1
  roles:
  - role: prepare_bootstrap

- hosts: masters
  remote_user: "{{user}}"
  become: True
  serial: 1
  roles:
  - role: run_masters

- hosts: private_agent
  remote_user: "{{user}}"
  become: True
  serial: 1
  roles:
  - role: run_private_agents

- hosts: public_agent
  remote_user: "{{user}}"
  become: True
  serial: 1
  roles:
  - role: run_public_agents

Answer 1

来自Rolling Update Batch Size章：

By default, Ansible will try to manage all of the machines referenced in a play in parallel. For a rolling updates use case, you can define how many hosts Ansible should manage at a single time by using the serial keyword...

因此，如果您从游戏中删除 serial: 1，Ansible 将运行在游戏中的所有主机上并行执行任务。

通过设置 serial: 1，您告诉 Ansible 一台接一台地接管主机，只有当上一个主机的所有任务都完成时才移动到下一个主机。

通常你想在一堆后端服务器上做串行运行s 以批量更新它们以防止服务停机，因为部分服务器仍然可以服务客户端的请求。

Ansible：如何将角色并行部署到不同的主机

Ansible: How can I deploy the roles on paralel to different hosts

ansible

ansible-playbook

ansible-2.x