On 22/03/19 5:34 AM, [email protected] wrote:
The following playbook worked for me, but I just started with Ansible
and I'm wondering if I went about this wrong? I feel like I may have
missed an easier way to say: do something only after a package has
finished installing ...
tasks: - name: Install python3 with a specific command and register
stdout to a var command: sudo yum -y install python3 python3-pip
register: varname - name: Create a directory only after python3 has
been installed file: path: /home/ec2-user/newdirectory state:
directory when: varname.stdout.find("Complete!") != -1
Avoid using the command module when there are specific Ansible modules
available for the task. To install packages via yum, there's the yum module.
https://docs.ansible.com/ansible/latest/modules/yum_module.html
And use `become` to escalate privilege.
Your playbook can be rewritten like :
tasks:
- name: Install python3
yum:
name:
- python3
- python3-pip
become: true
- name: Create a directory
file:
path: /home/ec2-user/newdirectory
state: directory
The first task in the playbook will ensure that the packages are
installed via yum. If there are any problems, Ansible will report it.
The second task, ie, creating directory will run only if the first task
succeeds. In general, playbook execution stops if any task fails. There
is no need to check for the status of the first task.
-
Sudheer S
On Thursday, March 21, 2019 at 2:24:58 PM UTC-7, [email protected] wrote:
Hello,
I have two tasks in a playbook. The first task installs software
with the command module. The second creates a file. I don’t want
the second task to run until the software has finished installing.
I’m pretty sure I need to use “when”, but I’m not sure what to
evaluate to determine that the software has finished installing.
I’m thinking that I could use the stdout of this yum command? The
last line output to the screen is “Complete!” would it be possible
to base the “when” on the existence of that text string in stdout?
something like:
- name: Install python3 with a specific command and register
stdout to a var
command: sudo yum -y install python3 python3-pip
register: stdout
- name: Create a directory after python3 has been installed
file:
path: /home/newdirectory
state: directory
when: [a line of text in stdout] == "Complete!"
Does this logic even make sense? I assumed that "register" would
put all of stdout into an array of lines of strings, but I don't
if that's how it works or not or how to search stdout for the
string "Complete!"?
Thanks much for any help
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