when: filesize(/var/log/apache2/access.log) > 5Mb

[anatoly techtonik]

What is the way to conditionally run task based on filesystem check on remote system?

I want something like this, but of course it doesn't work:

  tasks:
  - name: cleaning up the logs that exceed 5Mb
    command: cat /dev/null > {{ item }}
    when: filesize(/var/log/apache2/access.log) > 5Mb

[Brian Coca]

2 tasks

- stat: path=/var/log/apache2/access.log

  register: apache

- command: ...

  when: apache.stat.size > 5248000

[anatoly techtonik]

The final version appears as:

---
- hosts: "{{ host | default('localhost') }}"
  vars:
    - loglist:
      - /var/log/wtmp
      - /var/log/apache2/access.log
      - /var/log/apache2/error.log

  tasks:
  - name: erase old downloaded .deb archives
    command: apt autoclean

  - name: get log size info
    stat: path={{ item }}
    with_items: loglist
    register: logsize

  - name: cleaning up logs that exceed 5Mb
    debug: "msg='{{ item.item }}: {{ item.stat.size }}'"
    with_items: logsize.results
    when: item.stat.size > 5*(1024**2)

But the output of Ansible is way too huge.

[Brian Coca]

Now that I think of it, wouldn't running logrotate with a specific config from cron every few mins be better?

Brian Coca

[anatoly techtonik]

Well, replacing `debug:` action with `cron:` call seems doable, but I am not sure what the logrotate command should be.

[Brian Coca]

taken from the apache normal logrotate file, this will rotate the files weekly or when over 5mb, whichever comes first. I used a glob on the first line, if you want to avoid other log files, just specify the file list there. logrotate has good man page.

*/5 * * * * logrotate /etc/logrotate_apache_5mb.conf

--- /etc/logrotate_apache_5mb.conf

/var/log/apache2/*.log

{

        rotate 52

        weekly

        size 5Mb

        missingok

        notifempty

        compress

        create 640 root adm

        sharedscripts

        postrotate

                /etc/init.d/apache2 reload > /dev/null

        endscript

        prerotate

                if [ -d /etc/logrotate.d/httpd-prerotate ]; then \

                        run-parts /etc/logrotate.d/httpd-prerotate; \

                fi; \

        endscript

}

--
Brian Coca
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