blocks|key|1497500|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1497501|警告:如果主机列表为空，则只有本地主机可用。请注意，隐式localhost与“all”不匹配。|blockquote|1497502|1497503|1497504|问："Is有一种方法来制造错误，而不是Warning?"|offset|length|style|BOLD|1497505|答:是的。它是。在剧本里试一试。例如|1497506|-+hosts:+localhost
++tasks:
++++-+fail:
++++++++msg:+"[ERROR]+Empty+inventory.+No+host+available."
++++++when:+groups.all%7Clength+==+0

-+hosts:+all
++tasks:
++++-+debug:
++++++++msg:+Playbook+started|code-block|syntax|javascript|1497507|空置的存货|1497508|1497509|致命:本地主机:失败！=>+{“已更改”：false，"msg"：“错误空库存。没有可用主机”}|1497510|
。|1497511|entityMap^0|0|0|0|0|2|Q|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|11|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|12|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|13|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|14|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|15|7|@$H|16|I|17|J|K]]|8|@]|9|$]]|$1|L|3|M|4|5|6|18|7|@]|8|@]|9|$]]|$1|N|3|O|4|P|6|19|7|@]|8|@]|9|$Q|R]]|$1|S|3|T|4|5|6|1A|7|@]|8|@]|9|$]]|$1|U|3|-4|4|5|6|1B|7|@]|8|@]|9|$]]|$1|V|3|W|4|C|6|1C|7|@]|8|@]|9|$]]|$1|X|3|Y|4|5|6|1D|7|@]|8|@]|9|$]]|$1|Z|3|-4|4|5|6|1E|7|@]|8|@]|9|$]]]|10|$]]

<blockquote>
[WARNING]: provided hosts list is empty, only localhost is available. Note that the implicit localhost does not match 'all'
</blockquote>
Q: &quot;Is there a way to make that Error instead of Warning?&quot;
A: Yes. It is. Test it in the playbook. For example
<pre class="lang-yaml prettyprint-override"><code>- hosts: localhost
 tasks:
 - fail:
 msg: &quot;[ERROR] Empty inventory. No host available.&quot;
 when: groups.all|length == 0

- hosts: all
 tasks:
 - debug:
 msg: Playbook started
</code></pre>
gives with an empty inventory
<blockquote>
fatal: [localhost]: FAILED! =&gt; {&quot;changed&quot;: false, &quot;msg&quot;: &quot;[ERROR] Empty inventory. No host available.&quot;}
</blockquote>

blocks|key|1497549|text|一个简单的解决办法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1497550|1497551|创建游戏手册"main.yml“，如：|ordered-list-item|1497552|1497553|---
#+Check+first+if+the+supplied+host+pattern+{{+RUNNER.HOSTNAME+}}+matches+with+the+inventory
#+or+forces+otherwise+the+playbook+to+fail+(for+Jenkins)
-+hosts:+localhost
++vars_files:
++++-+"{{+jsonfilename+}}"
++tasks:
++++-+name:+"Hostname+validation+%7C+If+OK,+it+will+skip"
++++++fail:
++++++++msg:+"{{+RUNNER.HOSTNAME+}}+not+found+in+the+inventory+group+or+hosts+file+{{+ansible_inventory_sources+}}"
++++++when:+RUNNER.HOSTNAME+not+in+hostvars

#+The+main+playbook+starts
-+hosts:+"{{+RUNNER.HOSTNAME+}}"
++vars_files:
++++-+"{{+jsonfilename+}}"

++tasks:
++++-+Your+tasks
...
...
...|code-block|syntax|javascript|1497554|1497555|将主机变量放入json文件"var.json":|1497556|中。|1497557|{
++++"RUNNER":+{
++++++++"HOSTNAME":+"hostname-to-check"
++++},
++++"VAR1":{
++++++++"CIAO":+"CIAO"
++++}
}|1497558|1497559|运行命令：|1497560|1497561|ansible-playbook+main.yml+--extra-vars="jsonfilename=var.json"|1497562|您还可以根据自己的喜好对此解决方案进行调整，并通过命令直接传递主机名。|1497563|ansible-playbook+-i+hostname-to-check,+my_playbook.yml|1497564|但在最后一种情况下，请记住把你的剧本：|1497565|hosts:+all|1497566|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1A|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|1C|8|@]|9|@]|A|$J|K]]|$1|L|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|M|3|N|5|E|7|1E|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1F|8|@]|9|@]|A|$]]|$1|Q|3|R|5|I|7|1G|8|@]|9|@]|A|$J|K]]|$1|S|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|T|3|U|5|E|7|1I|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|W|3|X|5|I|7|1K|8|@]|9|@]|A|$J|K]]|$1|Y|3|Z|5|6|7|1L|8|@]|9|@]|A|$]]|$1|10|3|11|5|I|7|1M|8|@]|9|@]|A|$J|K]]|$1|12|3|13|5|6|7|1N|8|@]|9|@]|A|$]]|$1|14|3|15|5|I|7|1O|8|@]|9|@]|A|$J|K]]|$1|16|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]]|17|$]]

One simple solution is:
<ol>
<li>Create the playbook &quot;main.yml&quot; like:</li>
</ol>
<pre><code>---
# Check first if the supplied host pattern {{ RUNNER.HOSTNAME }} matches with the inventory
# or forces otherwise the playbook to fail (for Jenkins)
- hosts: localhost
 vars_files:
 - &quot;{{ jsonfilename }}&quot;
 tasks:
 - name: &quot;Hostname validation | If OK, it will skip&quot;
 fail:
 msg: &quot;{{ RUNNER.HOSTNAME }} not found in the inventory group or hosts file {{ ansible_inventory_sources }}&quot;
 when: RUNNER.HOSTNAME not in hostvars

# The main playbook starts
- hosts: &quot;{{ RUNNER.HOSTNAME }}&quot;
 vars_files:
 - &quot;{{ jsonfilename }}&quot;

 tasks:
 - Your tasks
...
...
...
</code></pre>
<ol start="2">
<li>Put your host variables in a json file &quot;var.json&quot;:</li>
</ol>
<pre><code>{
 &quot;RUNNER&quot;: {
 &quot;HOSTNAME&quot;: &quot;hostname-to-check&quot;
 },
 &quot;VAR1&quot;:{
 &quot;CIAO&quot;: &quot;CIAO&quot;
 }
}
</code></pre>
<ol start="3">
<li>Run the command:</li>
</ol>
<pre><code>ansible-playbook main.yml --extra-vars=&quot;jsonfilename=var.json&quot;
</code></pre>
You can also adapt this solution as you like and pass directly the hostname with the command
<pre><code>ansible-playbook -i hostname-to-check, my_playbook.yml
</code></pre>
but in this last case remember to put in your playbook:
<pre><code>hosts: all
</code></pre>

when you don't have any hosts in inventory, when running playbook there is only warning:

<pre><code>[WARNING]: provided hosts list is empty, only localhost is available. Note that the implicit localhost does not match 'all'
</code></pre>

Is there a way to make that Error instead of Warning?

I find out that there is this parameter in ansible.cfg:

<pre><code>[inventory]
unparsed_is_failed = True
</code></pre>

but it will only return error when there is no inventory file which you are trying to use. It didn't look into content.

Fail instead of Warning when no hosts are matched

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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当库存中没有任何主机时，运行剧本时只会发出警告：[WARNING]: provided hosts list is empty, only localhost is available. Note that the implicit localhost does not match 'all'是否有一种方法来制造错误而...

问失败，而不是在没有匹配主机时发出警告。
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问失败，而不是在没有匹配主机时发出警告。EN