Ansible - 在运行时定义库存 [英] Ansible - Define Inventory at run time
问题描述
我对 ansible 不太熟悉，所以如果我的问题有点基础，请耐心等待.
I am liitle new to ansible so bear with me if my questions are a bit basic.
场景:
我有几组远程主机，例如 [EPCs] [Clients] 和 [Testers]我可以按照我希望的方式配置它们.
I have a few group of Remote hosts such as [EPCs] [Clients] and [Testers] I am able to configure them just the way I want them to be.
问题:
我需要编写一个剧本，在运行时向用户询问运行时的清单.例如，当运行剧本时，应以以下方式提示用户:输入要配置的 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"
I need to write a playbook, which when runs, asks the user for the inventory at run time. As an example when a playbook is run the user should be prompted in the following way: "Enter the number of EPCs you want to configure" "Enter the number of clients you want to configure" "Enter the number of testers you want to configure"
应该发生什么:
现在例如用户分别输入 2,5 和 8.现在剧本应该只处理组 [EPCs] 中的前 2 个节点、组 [Clients] 中的前 5 个节点和组 [Testers] 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 选项或类似的选项
Now for instance the user enters 2,5 and 8 respectively. Now the playbook should only address the first 2 nodes in the group [EPCs], the first 5 nodes in group [Clients] and the first 7 nodes in the group [Testers] . I don't want to create a large number of sub-groups, for instance if I have 20 EPCs, then I don't want to define 20 groups for my EPCs, I want somewhat of a dynamic inventory, which should automatically configure the machines according to the user input at run time using the vars_prompt option or something similar to that
让我发布我的剧本的一部分，以便更好地了解将要发生的事情:
Let me post a partial part of my playbook for better understanding of what is to happen:
---
- 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 我试过你的解决方案，我的库存中有一个名为 test 的组，其中有两个节点.当我输入 0..1 时，我得到:
@gli I tried your solution, I have a group in my inventory named test with two nodes in it. When I enter 0..1 I get:
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:
Similarly when I enter 1..2 I get:
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(节点甚至不在清单中时，我得到:
Likewise when I enter 4..5 (nodes not even present in the inventory, I get:
TASK: [echo sequence] *********************************************************
changed: [vm1] => (item=some_prefix4)
changed: [vm2] => (item=some_prefix4)
changed: [vm1] => (item=some_prefix5)
changed: [vm2] => (item=some_prefix5)
任何帮助将不胜感激.谢谢！
Any help would be really appreciated. Thanks!
推荐答案
你应该使用 vars_prompt为了从用户那里获取信息，add_host 用于动态更新主机和 with_sequence for 循环:
You should use vars_prompt for getting information from user, add_host for updating hosts dynamically and with_sequence for loops:
$ 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,'
$ 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，它失败了，因为 host_0 和 host_1 无法访问，对你来说它会正常工作.
Here, it failed as host_0 and host_1 are unreachable, for you it'll work fine.
顺便说一句，我使用了更强大的概念节点范围".如果您不需要它，在提示中设置start=0"并仅要求stop"值非常简单.
btw, I used more powerful concept "range of nodes". If you don't need it, it is quite simple to have "start=0" and ask only for "stop" value in the prompt.
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