I'm a little confused about best practices for indempotence in Ansible.
Here's a quick playbook that does the following:
- installs mysql-server on a minimal debian system, preseeding the
questions (ugh) the package asks to set the mysql password
- installs zoneminder
- conditionally copies in a gzipped dumpfile of a pre-configured
zoneminder setup, unzips it, restores it
- and links the zoneminder stuff into the apache2 web configuration
Where I'm confused is the convoluted gymnastics needed to do things
conditionally, only if there was something done above. The playbook below
works fine, but it sure seems like a lot of work to do to make each step
indempotent. Am I missing something in best practices or syntax ?
Note - yes I set a db password to 'root' in this example, and I'm keying
off stuff stashed in /tmp existing or not. Don't sweat that part, it's
just an example. I'm interested in better understanding best practices re:
how to do the playbook structure and logic/flow. Thanks.
---
### unfortunately, this one always comes up as changed
- name: mysql | set debconf values
debconf: name='mysql-server-5.5' question={{ item.question}} value={{
item.value }} vtype={{ item.vtype }}
with_items:
- { question: 'mysql-server/root_password', value: 'root',
vtype: 'password' }
- { question: 'mysql-server/root_password_again', value: 'root',
vtype: 'password' }
- name: Install Mysql
apt: package={{ item }} state=present
with_items:
- mysql-server
- name: install zoneminder
apt: package={{ item }} state=present
with_items:
- zoneminder
### check to see if we ran before by looking for the extracted db dump
- name: check for previous database dumpfile
stat: path=/tmp/zm.dump
register: dumpfile
### if the extracted file isn't there, we need to copy the gzipped file in
- name: copy db dump into place
copy: src=zm.dump.gz dest=/tmp
when: dumpfile.stat.exists == False
register: zipped_dumpfile
### if we took action in the previous step, we need to unzip what we copied
in
- name: unzip db dump
command: gunzip -f /tmp/zm.dump.gz
when: zipped_dumpfile.changed == True
register: dumpfile_unzipped
### and that also means we need to restore the db dump to put it into place
- name: restore configured database
shell: mysql -uroot -proot zm < /tmp/zm.dump
when: dumpfile_unzipped.changed == True
notify: restart zoneminder
### similarly, we link zoneminder into the apache web and restart apache,
only if needed
- stat: path=/etc/apache2/sites-enabled/001-zm
register: apache_zm_site
- name: symlink zoneminder into web
file: src=/etc/zm/apache.conf dest=/etc/apache2/sites-enabled/001-zm
state=link
when: apache_zm_site.stat.exists == False
notify: restart apache
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