Ansible - 在运行时定义库存

时间:2014-08-15 12:27:15

标签: variables ansible roles ansible-playbook inventory

我对ansible很新,所以如果我的问题有点基础,请耐心等待。

情景:

我有一些远程主机,例如[EPC] [客户端]和[测试人员] 我能够按照我想要的方式配置它们。

问题:

我需要编写一个剧本,在运行时,会在运行时向用户询问库存。 作为运行剧本的示例,应该以下列方式提示用户: “输入您要配置的EPC数量” “输入您要配置的客户端数量” “输入您要配置的测试人员数量”

会发生什么:

现在用户分别输入2,5和8。 现在,剧本应仅解决组[EPC]中的前2个节点,组[客户端]中的前5个节点以及组[测试人员]中的前7个节点。 我不想创建大量的子组,例如,如果我有20个EPC,那么我不想为我的EPC定义20个组,我想要一些动态库存,它应该自动配置根据用户在运行时输入的机器使用 vars_prompt 选项或类似的东西

让我发布我的剧本的部分内容,以便更好地了解将要发生的事情:

---
- hosts: epcs # Now this is the part where I need a lot of flexibility

  vars_prompt:
    name: "what is your name?"
    quest: "what is your quest?"

  gather_facts: no

  tasks:

  - name: Check if path exists
    stat: path=/home/khan/Desktop/tobefetched/file1.txt
    register: st

  - name: It exists
    debug: msg='Path existence verified!'
    when: st.stat.exists

   - name: It doesn't exist
     debug: msg="Path does not exist"
     when: st.stat.exists == false

   - name: Copy file2 if it exists
     fetch: src=/home/khan/Desktop/tobefetched/file2.txt dest=/home/khan/Desktop/fetched/   flat=yes
     when: st.stat.exists

   - name: Run remotescript.sh and save the output of script to output.txt on the Desktop
     shell: cd /home/imran/Desktop; ./remotescript.sh > output.txt

   - name: Find and replace a word in a file placed on the remote node using variables
     shell: cd /home/imran/Desktop/tobefetched; sed -i 's/{{name}}/{{quest}}/g' file1.txt

    tags:
       - replace

@gli我尝试了你的解决方案,我的库存中有一个名为test的组,其中包含两个节点。当我输入 0..1 时,我得到:

TASK: [echo sequence] ********************************************************* 
changed: [vm2] => (item=some_prefix0)
changed: [vm1] => (item=some_prefix0)
changed: [vm1] => (item=some_prefix1)
changed: [vm2] => (item=some_prefix1)

同样,当我输入 1..2 时,我得到:

TASK: [echo sequence] ********************************************************* 
changed: [vm2] => (item=some_prefix1)
changed: [vm1] => (item=some_prefix1)
changed: [vm2] => (item=some_prefix2)
changed: [vm1] => (item=some_prefix2)

同样,当我输入 4..5 时(库存中甚至没有节点,我得到:

TASK: [echo sequence] ********************************************************* 
changed: [vm1] => (item=some_prefix4)
changed: [vm2] => (item=some_prefix4)
changed: [vm1] => (item=some_prefix5)
changed: [vm2] => (item=some_prefix5)

任何帮助都会非常感激。谢谢!

2 个答案:

答案 0 :(得分:11)

您应该使用vars_prompt来获取用户的信息,add_host以便动态更新主机,并使用with_sequence for循环:

$ cat aaa.yml
---
- hosts: localhost
  gather_facts: False
  vars_prompt:
    - name: range
      prompt: Enter range of EPCs (e.g. 1..5)
      private: False
      default: "1"
  pre_tasks:
    - name: Set node id variables
      set_fact:
        start: "{{ range.split('..')[0] }}"
        stop: "{{ range.split('..')[-1] }}"
    - name: "Add hosts:"
      add_host: name="host_{{item}}" groups=just_created
      with_sequence: "start={{start}} end={{stop}} "

- hosts: just_created
  gather_facts: False
  tasks:
    - name: echo sequence
      shell: echo "cmd"

输出将是:

$ ansible-playbook aaa.yml -i' localhost,'

Enter range of EPCs (e.g. 1..5) [1]: 0..1

PLAY [localhost] **************************************************************

TASK: [Set node id variables] *************************************************
ok: [localhost]

TASK: [Add hosts:] ************************************************************
ok: [localhost] => (item=0)
ok: [localhost] => (item=1)

PLAY [just_created] ***********************************************************

TASK: [echo sequence] *********************************************************
fatal: [host_0] => SSH encountered an unknown error during the connection. We recommend you re-run the command using -vvvv, which will enable SSH debugging output to help diagnose the issue
fatal: [host_1] => SSH encountered an unknown error during the connection. We recommend you re-run the command using -vvvv, which will enable SSH debugging output to help diagnose the issue

FATAL: all hosts have already failed -- aborting

PLAY RECAP ********************************************************************
           to retry, use: --limit @/Users/gli/aaa.retry

host_0                     : ok=0    changed=0    unreachable=1    failed=0
host_1                     : ok=0    changed=0    unreachable=1    failed=0
localhost                  : ok=2    changed=0    unreachable=0    failed=0

在这里,由于host_0和host_1无法访问,它失败了,因为它可以正常工作。

不过,我使用了更强大的概念"节点范围"。如果你不需要它,那么让#34; start = 0"并且只要求"停止"提示中的值。

答案 1 :(得分:2)

我认为您无法在运行时定义广告资源。您可以做的一件事是,在Ansible上编写一个包装器脚本,它首先会提示用户输入主机,然后动态构建一个ansible-playbook命令。

我更喜欢使用python执行此操作,但您可以使用您选择的任何语言。

$ cat ansible_wrapper.py 
import ConfigParser
import os

nodes = ''
inv = {}

hosts =  raw_input("Enter hosts: ")
hosts = hosts.split(",")

config = ConfigParser.ConfigParser(allow_no_value=True)
config.readfp(open('hosts'))
sections = config.sections()

for i in range(len(sections)):
    inv[sections[i]] = hosts[i]


for key, value in inv.items():
    for i in range(int(value)):
        nodes = nodes + config.items(key)[i][0] + ";"


command = 'ansible-playbook -i hosts myplaybook.yml -e "nodes=%s"' % (nodes)
print "Running command: ", command
os.system(command)

注意:我尝试仅使用python2.7

运行此脚本