Ansible-在运行时定义库存 [英] Ansible - Define Inventory at run time
问题描述
我对ansible并不陌生，所以如果我的问题有点基本，请多多包涵.
场景:
我有几组远程主机，例如[EPC] [Clients]和[Testers] 我能够按照我希望的方式配置它们.
问题:
我需要写一本剧本，该剧本在运行时会在运行时向用户询问库存. 例如，运行剧本时，应通过以下方式提示用户: 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的数量"
会发生什么:
例如，现在用户分别输入2,5和8. 现在，剧本只应寻址[EPC]组中的前2个节点，[Clients]组中的前5个节点和[Testers]组中的前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，我想要一些动态清单，它应该自动配置使用 vars_prompt 选项或类似的选项根据运行时的用户输入操作计算机
让我张贴剧本的一部分，以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我尝试了您的解决方案，我的清单中有一个名为test的组，其中有两个节点.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)
类似地，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(清单中甚至不存在节点，我都会得到:
TASK: [echo sequence] *********************************************************
changed: [vm1] => (item=some_prefix4)
changed: [vm2] => (item=some_prefix4)
changed: [vm1] => (item=some_prefix5)
changed: [vm2] => (item=some_prefix5)
任何帮助将不胜感激.谢谢！
您应使用 vars_prompt 为从用户获取信息， add_host 用于动态更新主机，而 输出将是: $ ansible-playbook aaa.yml -i'localhost' 在这里，由于host_0和host_1无法访问，它失败了，对您而言，它可以正常工作. 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，那么简单地选择"start = 0"并在提示中只要求"stop"值即可. I am liitle new to ansible so bear with me if my questions are a bit basic. Scenario: 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. Problem: 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" What should happen: 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 Let me post a partial part of my playbook for better understanding of what is to happen: @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: Similarly when I enter 1..2 I get: Likewise when I enter 4..5 (nodes not even present in the inventory, I get: Any help would be really appreciated. Thanks! You should use vars_prompt for getting information from user, add_host for updating hosts dynamically and with_sequence for loops: The output will be: $ ansible-playbook aaa.yml -i 'localhost,' Here, it failed as host_0 and host_1 are unreachable, for you it'll work fine. 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. 这篇关于Ansible-在运行时定义库存的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！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
---
- 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
TASK: [echo sequence] *********************************************************
changed: [vm2] => (item=some_prefix0)
changed: [vm1] => (item=some_prefix0)
changed: [vm1] => (item=some_prefix1)
changed: [vm2] => (item=some_prefix1)
TASK: [echo sequence] *********************************************************
changed: [vm2] => (item=some_prefix1)
changed: [vm1] => (item=some_prefix1)
changed: [vm2] => (item=some_prefix2)
changed: [vm1] => (item=some_prefix2)
TASK: [echo sequence] *********************************************************
changed: [vm1] => (item=some_prefix4)
changed: [vm2] => (item=some_prefix4)
changed: [vm1] => (item=some_prefix5)
changed: [vm2] => (item=some_prefix5)
$ 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"
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
