List Ansible：如何获取列表的值（stdout\u行）？

谢谢你给我一些时间阅读这个问题

我的完整剧本是：

---

- hosts: all
  remote_user: secret_user
  become: yes

  tasks:

    - include_vars: vars.yml

    - name: Copy set of rpms/binaries/and Java scripts to server.
      copy:
        src: "{{ item }}"
        dest: "{{ tempdir }}"
      with_items:
        - files/mongo-10gen-2.4.4-5.el6.x86_64.rpm
        - files/mongo-10gen-server-2.4.4-5.el6.x86_64.rpm
        - files/mongo-10gen-2.6-1.el6.x86_64.rpm
        - files/mongo-10gen-server-2.6-1.el6.x86_64.rpm
        - files/mongo26
        - bash/javascript/populateDB.js

    - name: Create mongo user.
      user:
        name: mongod
        comment: For mongo installation.
        home: /var/lib/mongo
        shell: /bin/false

    - name: Install mongo-2.4
      yum:
        name: "{{ item }}"
        state: present
      with_items:
        - "{{ tempdir }}/mongo-10gen-2.4.4-5.el6.x86_64.rpm"
        - "{{ tempdir }}/mongo-10gen-server-2.4.4-5.el6.x86_64.rpm"

    - name: Send configuration files.
      template:
        src: "{{ item.src }}"
        dest: "{{ item.dest }}"
      with_items:
              - { src: 'templates/mongod.j2', dest: '/etc/mongod.conf' }
              - { src: 'templates/mongodb-configsvr.j2', dest: '/etc/mongodb-configsvr.conf' }

    - name: Create directories to storing logs.
      file:
        path: "{{ item }}"
        state: directory
        owner: mongod
        group: mongod
        mode: u=rwx,g=rw,o=rw
        recurse: yes
      with_items:
        - /var/log/mongodb/
        - /var/lib/mongodb/
        - /var/lib/mongodb-config/

    - name: Create files to storing logs.
      file:
        path: "{{ item }}"
        state: touch
        owner: mongod
        group: mongod
      with_items:
        - /var/log/mongodb/mongod.log

    - name: Start mongo2.4 service
      shell: "{{ item }}"
      with_items:
        - /usr/bin/mongod -f /etc/mongod.conf
        - /usr/bin/mongod -f /etc/mongodb-configsvr.conf
      ### Remove or comment once test is finished.
      ignore_errors: yes

      #name: mongod
      # state: started
      #  args: -f /etc/mongod.conf

      #### Finished Pre tasks

    - name: Check who is the master.
      script:
        cmd: bash/checkmaster.sh
        chdir: "{{ tempdir }}"
      register: master
      when: inventory_hostname == play_hosts[0]

    - name: Check who are the secondary nodes.
      script:
        cmd: bash/checksecond.sh
        chdir: "{{ tempdir }}"
      register: secondary
      when: inventory_hostname == play_hosts[0]

    - name: debug var name.
      debug:
        var: master

    - name: debug var name - second.
      debug:
        var: secondary

    - name: Populate DB. (Execute only if is a NEW INSTALLATION).
      script:
        cmd: bash/populateDB.sh
        chdir: "{{ tempdir }}"
      register: populateDB
      with_items:
        - "{{ master.stdout_lines }}"

    - name: (Before upgrade.) Execute V2.6 script to validate if is good to proceed.
      script: 
        cmd: bash/mongo2.6.sh
        chdir: "{{ tempdir }}"
      register: Mongo26
      failed_when:
        - '"Everything is ready for the upgrade!" not in Mongo26.stdout'
      with_items:
        - "{{ master.stdout_lines }}"

      # Starting with upgrade.

    - name: Upgrading on SECONDARY NODES - Stop and installing service node:1.
      shell: pgrep mongo | xargs kill -2; rpm -Uvh "{{ tempdir }}/mongo-10gen-2.6-1.el6.x86_64.rpm"; rpm -Uvh "{{ tempdir }}/mongo-10gen-server-2.6-1.el6.x86_64.rpm"
      throttle: 1
      with_items:
        - "{{ secondary.stdout_lines[0] }}"
        - "{{ secondary.stdout_lines[1] }}"

我的问题是上一个名为“在辅助节点上升级”的任务。我试图实现的是获取list

secondary.stdoutlines

的值，以便仅将最后一个任务传递给这些服务器。此变量的内容包括：

TASK [debug var name - second.] ****************************************************************************************************************************************************************************
ok: [192.168.33.2] => {
    "secondary": {
        "changed": true,
        "failed": false,
        "rc": 0,
        "stderr": "Shared connection to 192.168.33.2 closed.\r\n",
        "stderr_lines": [
            "Shared connection to 192.168.33.2 closed."
        ],
        "stdout": "\r\nmongodb02.ppc.us\r\nmongodb03.ppc.us\r\n",
        "stdout_lines": [
            "",
            "mongodb02.ppc.us",
            "mongodb03.ppc.us"
        ]
    }
}
ok: [192.168.33.3] => {
    "secondary": {
        "changed": false,
        "skip_reason": "Conditional result was False",
        "skipped": true
    }
}
ok: [192.168.33.4] => {
    "secondary": {
        "changed": false,
        "skip_reason": "Conditional result was False",
        "skipped": true
    }
}

因此，我试图在

{{secondary.stdout_lines}

上列出的节点上运行最后一个任务。每次运行剧本时，我都会：

      with_items:
        - "{{ secondary.stdout_lines[0] }}"
        - "{{ secondary.stdout_lines[1] }}"

此任务在第一个节点（mongodb01）上执行，而不是在secondary.stdout_行（mongodb02、mongodb03）中执行

有人知道如何做到这一点吗

提前谢谢

编辑：以下是新发行的：

存货的内容：

---
all:
  hosts:
    mongodb01.ppc.us:
      ansible_host: 192.168.33.2
    mongodb02.ppc.us:
      ansible_host: 192.168.33.3
    mongodb03.ppc.us:
      ansible_host: 192.168.33.4
  vars:
    ansible_python_interpreter: /usr/bin/python

任务的调试：

• 变量：主

• 清单主机名的调试

• 检查主节点任务：

---

首先，让我们看看你的问题

在播放的第一台主机上（

play\u hosts[0]

），您正在将

secondary

变量设置为运行

bash/checksecond.sh

的结果。你在剧中的任何其他主机上都没有这样做。这意味着当您运行此任务时

    - name: Upgrading on SECONDARY NODES - Stop and installing service node:1.
      shell: pgrep mongo | xargs kill -2; rpm -Uvh "{{ tempdir }}/mongo-10gen-2.6-1.el6.x86_64.rpm"; rpm -Uvh "{{ tempdir }}/mongo-10gen-server-2.6-1.el6.x86_64.rpm"
      throttle: 1
      with_items:
        - "{{ secondary.stdout_lines[0] }}"
        - "{{ secondary.stdout_lines[1] }}"

…次要变量仅在播放主机[0]上有一个有用的值。这将是未定义的任何其他主机在发挥。您不显示playbook的输出，但我希望该playbook在辅助节点上失败

你真的想通过让只针对相关节点的播放来处理这种“只在某些节点上运行”的行为。您可以使用

group\u by

模块创建动态节点组。例如，如果我们假设您的

bash/checkmaster.sh

脚本输出主节点的名称，我们可以执行如下操作：

---
- hosts: all
  gather_facts: false
  tasks:
    - name: check master node
      script:
        cmd: bash/checkmaster.sh
      register: master

    - set_fact:
        is_master: "{{ master.stdout_lines[0] == inventory_hostname }}"

    - group_by:
        key: "role_{{ 'master' if is_master else 'secondary' }}"

- hosts: role_master
  gather_facts: false
  tasks:
    - debug:
        msg: "tasks on master node"

- hosts: role_secondary
  gather_facts: false
  tasks:
    - debug:
        msg: "tasks on secondary nodes"

本剧完成后，您将拥有一个名为

role\u master

的组，其中包含主节点，以及一个名为

role\u secondary

的组，其中包含次节点。然后，您可以在后续播放中以这些为目标，如下所示：

---
- hosts: all
  gather_facts: false
  tasks:
    - name: check master node
      script:
        cmd: bash/checkmaster.sh
      register: master

    - set_fact:
        is_master: "{{ master.stdout_lines[0] == inventory_hostname }}"

    - group_by:
        key: "role_{{ 'master' if is_master else 'secondary' }}"

- hosts: role_master
  gather_facts: false
  tasks:
    - debug:
        msg: "tasks on master node"

- hosts: role_secondary
  gather_facts: false
  tasks:
    - debug:
        msg: "tasks on secondary nodes"

---

我在中列出了一个可运行的示例。

您能具体向我们展示一下您的尝试吗？向我们展示您试图使用此值的剧本。完成！我添加了完整的剧本和更好的描述：）谢谢你的帮助@larsks你是个救命恩人！谢谢这就是我所需要的！不幸的是，我在执行的时候遇到了问题：```ok:[mongodb01.ppc.us]=>{“是大师”：false}ok:[mongodb02.ppc.us]=>{“是大师”：false}ok:[mongodb03.ppc.us]=>{“是大师”：false}我的清单文件：----hosts:mongodb01.ppc.us:ansible_主机：192.168.33.2 mongodb02.ppc.us:ansible_主机：192.168.33.2 mongodb03.ppc.us:ansible_主机：192.168.33.2您应该检查

checkmaster.sh

脚本的输出是否与我在这里所做的假设（即输出的第一行包含必要的信息）。这个事实非常奇怪。checkmaster.sh的内容是

echo$'rs.status（）'|$MONGO_BIN | grep-b3“PRIMARY”| grep-v-E“health | state”| awk'{print$3}'| awk-F'：“{print$1}”sed's/“//g'

它在

mongodb01.ppc.us

上产生。发生这种情况时，所有条件都会导致剧本中出现错误的

debug

任务，该任务显示

master

变量的内容和

inventory\u主机名的内容。也许可以把这个加到你的问题上？你无法在评论中有效地格式化它。我刚刚更新了新版本。我真的很感激你的帮助！！！我肯定我错过了一些非常简单的东西，但我不知道是什么
- hosts: role_master
  gather_facts: false
  tasks:
    - debug:
        msg: "tasks on master node"

- hosts: role_secondary
  gather_facts: false
  tasks:
    - debug:
        msg: "tasks on secondary nodes"