Have a closer look at [Rolling Updates][1]:

What you are searching for is 

    - hosts: webservers
      serial: 1
      tasks:
        - name: ...


  [1]: https://docs.ansible.com/ansible/latest/user_guide/playbooks_delegation.html

Using the --forks=1 specify number of parallel processes to use (default=5)

Strategy enable to parallel tasks in a per host basis.  See https://docs.ansible.com/ansible/latest/user_guide/playbooks_strategies.html 

There are  3 strategies: linear (the default), serial and free (quickest)

    - hosts: all
      strategy: free
      tasks:
        ...


API Level &lt; 21 

Thumb is transparent, as expected.

![Screenshot taken on a Nexus 5 running Android 4.4.4][1]


On API Level 21

Thumb is opaque, Wonder why.

![Screenshot taken on a Nexus 5 running Android 5.0][2]


Here is the code

     &lt;SeekBar
                    android:id=&quot;@+id/ui_audioplayer_progressbar&quot;
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:progressDrawable=&quot;@drawable/custom_progress_bar_horizontal&quot;
                    android:thumb=&quot;@drawable/stud_slider&quot; /&gt;


Interestingly, this problem can be seen and reproduced in the xml preview in eclipse itself, when you change the API Level perspectives. 

![When API level 21 is selected][4]


![When API level 19 is selected][3]


Note: 

 - I run the same apk on both devices.
 - Both devices are of the same make and model, i.e Nexus 5.
 - The thumb image is a PNG with a transparent background, as apparent from the screenshot for API Level &lt; 21

 

Is this a known bug in Lollipop or am i doing something wrong?


  [1]: http://i.stack.imgur.com/OJGrZ.png
  [2]: http://i.stack.imgur.com/1tu0P.png
  [3]: http://i.stack.imgur.com/dKnQH.png
  [4]: http://i.stack.imgur.com/MWmx4.png

Seek Bar thumb not transparent in Android 5.0 API 21 Lollipop

I&#39;ve been using both for my startup and to me, the functionality is the same. Until now, the instances I&#39;ve been creating  are only for computation. I&#39;m wondering how GCE disk images and snapshots are different in terms of technology, and in which situation it is better to use one over the other. 

Google Compute Engine: what is the difference between disk snapshot and disk image?

I am using ansible to script a deployment for an API.  I would like this to work sequentially through each host in my inventory file so that I can fully deploy to one machine at a time.

With the out box behaviour, each task in my playbook is executed for each host in the inventory file before moving on to the next task.

How can I change this behaviour to execute all tasks for a host before starting on the next host? Ideally I would like to only have one playbook.

Thanks

Ansible - How to sequentially execute playbook for each host

I am using ansible to script a deployment for an API. I would like this to work sequentially through each host in my inventory file so that I can fully deploy to one machine at a time.
With the out box behaviour, each task in my playbook is executed for each host in the inventory file before moving on to the next task.
How can I change this behaviour to execute all tasks for a host before starting on the next host? Ideally I would like to only have one playbook.
Thanks

Hi I am trying to find out how to set environment variable with Ansible.

something that a simple shell command like this:

    EXPORT LC_ALL=C

tried as shell command and got an error
tried using the environment module and nothing happend.

what am I missing

How to set Linux environment variables with Ansible

I&#39;m using Ansible to copy a directory (900 files, 136MBytes) from one host to another:
```yaml
---
- name: copy a directory
      copy: src={{some_directory}} dest={{remote_directory}}
```
This operation takes an incredible 17 minutes, while a simple `scp -r &lt;src&gt; &lt;dest&gt;` takes a mere 7 seconds.

I have tried the Accelerated mode, which according to the [ansible docs][1], but to no avail.

&gt; can be anywhere from 2-6x faster than SSH with ControlPersist enabled, and 10x faster than paramiko.

but to no avail.


  [1]: http://docs.ansible.com/playbooks_acceleration.html

Why is copying a directory with Ansible so slow?

I&#39;m trying to check if the version supplied is a valid supported version. I&#39;ve set the list of acceptable versions in a variable, and I want to fail out of the task if the supplied version is not in the list. However, I&#39;m unsure of how to do that.

    #/role/vars/main.yml
    ---
      acceptable_versions: [2, 3, 4]
and

    #/role/tasks/main.yml
    ---
      - fail: 
          msg: &quot;unsupported version&quot;
          with_items: &quot;{{acceptable_versions}}&quot;
          when: &quot;{{item}} != {{version}}&quot;

      - name: continue with rest of tasks...

Above is sort of what I want to do, but I haven&#39;t been able to figure out if there&#39;s a one line way to construct a &quot;list contains&quot; call for the fail module.

Check if a list contains an item in Ansible

What is the easiest way to create an empty file using Ansible? I know I can save an empty file into the `files` directory and then copy it to the remote host, but I find that somewhat unsatisfactory.

Another way is to touch a file on the remote host:

    - name: create fake &#39;nologin&#39; shell
      file: path=/etc/nologin state=touch owner=root group=sys mode=0555

But then the file gets touched every time, showing up as a yellow line in the log, which is also unsatisfactory...

Is there any better solution to this simple problem?

How to create an empty file with Ansible?

I&#39;m writing an Ansible playbook and have a task which will always fail in check mode:

    hosts: ...
    tasks:
        - set_fact: filename=&quot;{{ansible_date_time.iso8601}}&quot;
        - file: state=touch name={{filename}}
        - file: state=link src={{filename}} dest=latest

In check mode, the file will not be created so the `link` task will always fail.  Is there a way to mark such a task to be skipped when running in check mode?  Something like:

    - file: state=link src={{filename}} dest=latest
      when: not check_mode

Skip Ansible task when running in check mode?

When writing and debugging Ansible playbooks, typical workflow is as follows:

1. `ansible-playbook ./main.yaml`
2. Playbook fails on some task
3. Fix this task and repeat line 1, waiting for all previous tasks to execute again. Which takes a lot of time

Ideally, i&#39;d like to resume execution on failed task, having inventory and all facts collected by previous tasks. Is it even possible? How to make playbook writing/debugging faster?

How to continue execution on failed task after fixing error in playbook?

I am looking for a way to perform a task when ansible variable is not registers /undefined e.g 

    -- name: some task
       command:  sed -n &#39;5p&#39; &quot;{{app.dirs.includes}}/BUILD.info&quot; | awk &#39;{print  $2}&#39;
       when: (! deployed_revision) AND ( !deployed_revision.stdout )
       register: deployed_revision





How to run a task when variable is undefined in ansible?

I&#39;m designing a kind of playbook lib with individual tasks

so in the usual roles repo, I have something like:

    roles
    ├── common
    │&#160;&#160; └── tasks
    │       ├── A.yml
    │&#160;&#160;     ├── B.yml
    │       ├── C.yml
    │       ├── D.yml
    │       ├── login.yml
    │       ├── logout.yml
    │&#160;&#160;     └── save.yml
    ├── custom_stuff_workflow
    │   └── tasks
    │       └── main.yml
    └── other_stuff_workflow
        └── tasks
            └── main.yml

my main.yml in custom_stuff_workflow then contain something like:

    ---
    
    - include: login.yml
    - include: A.yml
    - include: C.yml
    - include: save.yml
    - include: logout.yml
and this one in the other workflow:

    ---
    
    - include: login.yml
    - include: B.yml
    - include: A.yml
    - include: D.yml
    - include: save.yml
    - include: logout.yml
I can&#39;t find a way to do it in a natural way:
one way that worked was having all tasks in a single role and tagging the relevant tasks while including a custom_stuff_workflow

The problem I have with that is that tags cannot be set in the calling playbook: it&#39;s only to be set at command line
as I&#39;m distributing this ansible repo with many people in the company, I can&#39;t rely on command line invocations (it would be nice to have a `#!` header in yml to be processed by `ansible-playbook` command)

I could also copy the relevant tasks (inside common in the above tree) in each workflow, but I don&#39;t want to repeat them around

Can someone see a solution to achieve what I&#39;d like without repeating the tasks over different roles?

I guess the corner stone of my problem is that I define tasks as individual and it looks not natural in ansible...


Thanks a lot

PS: note that the tasks in the workflow have to be done in specific order and the only natural steps to abstract would be the login and save/logout

PPS: I&#39;ve seen this question https://stackoverflow.com/questions/22078333/how-do-i-call-a-role-from-within-another-role-in-ansible but it does not solve my problem as it&#39;s invoking a full role and not a subset of the tasks in a role

include tasks from another role in ansible playbook

# The settings
Consider an [Ansible inventory file][1] similar to the following example:

    [san_diego]
    host1
    host2
    
    [san_francisco]
    host3
    host4
    
    [west_coast]
    san_diego
    san_francisco
    
    [west_coast:vars]
    db_server=foo.example.com
    db_host=5432
    db_password=top secret password

# The problem

I would like to store some of the vars (like `db_password`) in an [Ansible vault][2], but not the entire file.

How can a vault-encrypted ansible file be imported into an unencrypted inventory file?

# What I&#39;ve tried

I have created an encrypted vars file and tried importing it with:

    include: secrets

To which `ansible-playbook` responded with:

    ERROR: variables assigned to group must be in key=value form

Probably because it tried to parse the `include` statement as a variable.

  [1]: http://docs.ansible.com/intro_inventory.html
  [2]: https://docs.ansible.com/playbooks_vault.html

Content Type	Original Author	Original Content on Stackoverflow
Question	Lynn	View Question on Stackoverflow
Solution 1 - Ansible	ProfHase85	View Answer on Stackoverflow
Solution 2 - Ansible	Jobin James	View Answer on Stackoverflow
Solution 3 - Ansible	MUY Belgium	View Answer on Stackoverflow

Ansible - How to sequentially execute playbook for each host

Ansible Problem Overview

Ansible Solutions

Solution 1 - Ansible

Solution 2 - Ansible

Solution 3 - Ansible

Google Compute Engine: what is the difference between disk snapshot and disk image?

Seek Bar thumb not transparent in Android 5.0 API 21 Lollipop

Attributions