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I try to subtract 2 variables in Ansible, but what I get is zero in the result.
- name: ansible calculate space
hosts: pghosts
gather_facts: false
tasks:
- name: Check /srv freespace
shell: df /srv --output\=avail | tail -1
register: srv_freespace
- name: Check postgres data dir size
shell: du -ks /srv/postgresql/data |awk '{ print $1 }'
register: postgres_data
- debug:
msg: "substraction {{ srv_freespace|int - postgres_data|int }}"
- copy: content="{{ srv_freespace|int - postgres_data|int }}" dest=/tmp/results.txt
Try changing the last line to:
- copy: content="{{ srv_freespace.stdout|int - postgres_data.stdout|int }}" dest=/tmp/results.txt
Explanation: the registered variable is not a string, its a dict. The dict includes several keys like the command name, command start and end time, exit code and other good stuff. The actual value i.e. what is printed to standard output is under the stdout key.
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Expected output is the version of nginx, but it outputs a blank string instead:
- hosts: localhost
tasks:
- name: check if nginx exists
stat:
path: /usr/sbin/nginx
register: result
- name: check nginx version
command: nginx -v
register: version
- debug: msg="{{version.stdout}}"
I am getting the below output instead:
TASK [debug] *********************************************************************************************************************
ok: [localhost] => {
"msg": ""
}
It's because nginx -v sends its output to stderr, as one can see with
$ nginx -v >/dev/null
nginx version: nginx/1.23.3
$ nginx -v 2>/dev/null
$
so your output is actually in version.stderr, as you would have seen for yourself had you increased the ansible verbosity or used
- debug: var=version
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I try to run task depending on two conditions using logical "and". For the first condition I created the following task:
- name: Check if configuration already exists, then skip next task
stat:
path: "{{openldap_config}}/cn=config"
register: is_configured
Then I crated the following task, which is working fine:
- name: add new basic-configuration
shell: /opt/symas/sbin/slapadd -n 0 -F {{openldap_config}} -l /home/{{ansible_user}}/config.ldif
args:
executable: /bin/bash
when: not is_configured.stat.exists
If a configuration file exists the task will be skipped. Then I have a few task where I use "group_names" like this on:
- name: generating deltasyncrepl LDIF for main DB
template:
src: main_db_repl.j2
dest: /home/{{ansible_user}}/main-db-repl.ldif
owner: "{{ansible_user}}"
group: "{{ansible_group}}"
mode: '660'
when: "'ldap_provider' in group_names"
That's also working. BUT now I would like to have a logical "and" for both conditions:
- name: add replication of cn=config to all provider
shell: /opt/symas/bin/ldapmodify -Y EXTERNAL -H ldapi:/// -f /home/{{ansible_user}}/repl_config.ldif
args:
executable: /bin/bash
when: not is_configured.stat.exists
and "'ldap_provider' in group_names"
This is not working. I tried different quoting but I could not find a a working solution. I try it with brackets too, also not working. Some how it must be possible to have a logical AND with a int- and a string- variable.
Thanks for any help
While you can manually stat the file and that works just fine, this is actually exactly the case that the creates parameter to the shell and command modules is designed to handle. You should also migrate to the cmd parameter (supported since Ansible 2.0) instead of using args, so that people reading your code don't have to understand that rarely-used syntax:
- name: Basic configuration for OpenLDAP
shell:
cmd: /opt/symas/sbin/slapadd -n 0 -F {{ openldap_config }} -l /home/{{ ansible_user }}/config.ldif
executable: /bin/bash
creates: "{{ openldap_config }}/cn=config"
register: openldap_config_result
While you didn't include your other attempts at solving this problem, generally the best way to apply multiple conditions to a task is to use a list, which will implicitly apply and between each condition in the list:
- name: Add replication of cn=config to all providers
shell:
cmd: /opt/symas/bin/ldapmodify -Y EXTERNAL -H ldapi:/// -f /home/{{ ansible_user }}/repl_config.ldif
executable: /bin/bash
when:
- openldap_config_result is changed
- "'ldap_provider' in group_names"
You can also do it as a single string, though you have to make sure your quoting is correct (which it isn't in your question):
when: openldap_config_result is changed
and 'ldap_provider' in group_names
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How do I set the default value to a variable? The following does not work:
{{ var_name | default( another_var) }}
another_var is a variable - how do I expand it?
According the documentation Providing default values
you can now simply use a default with a value in a nested data structure
and a test with an
Example
---
- hosts: localhost
become: false
gather_facts: false
vars:
DEFAULT: "test"
tasks:
- name: Define and show default value
debug:
msg: "{{ VAR | default(DEFAULT) }}"
resulting in an output of
TASK [Define and show default value] ******
ok: [localhost] =>
msg: test
it is working as described.
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I have an ansible task that writes 2 lines into journald.conf, however it doesn't perform idempotency when running again.
I have seen the following questions that didn't work for me:
Ansible lineinfile duplicates line
Idempotency in ansible playbook
https://github.com/ansible/ansible/issues/4531
My regex seems to be okay, you can see below my task:
- name: set cpu affinity settings in systemd
lineinfile:
dest: /etc/systemd/journald.conf
line: "{{ item.key }}={{ item.value }}"
regexp: "^#?{{ item.value }}"
state: present
with_dict:
RateLimitIntervalSec: 0
RateLimitBurst: 0
tags: journald
notify: restart journald
The expected behavior should be: keep the commented line and add new ones at the end of the file with the items in the list, unless the uncommented lines already exists.
My file journald.conf file is like this:
[Journal]
#Storage=auto
#Compress=yes
#Seal=yes
#SplitMode=uid
#SyncIntervalSec=5m
#RateLimitIntervalSec=30s
#RateLimitBurst=1000
#SystemMaxUse=
#SystemKeepFree=
#SystemMaxFileSize=
#SystemMaxFiles=100
#RuntimeMaxUse=
#RuntimeKeepFree=
#RuntimeMaxFileSize=
#RuntimeMaxFiles=100
#MaxRetentionSec=
#MaxFileSec=1month
#ForwardToSyslog=yes
#ForwardToKMsg=no
#ForwardToConsole=no
#ForwardToWall=yes
#TTYPath=/dev/console
#MaxLevelStore=debug
#MaxLevelSyslog=debug
#MaxLevelKMsg=notice
#MaxLevelConsole=info
#MaxLevelWall=emerg
#LineMax=48K
RateLimitIntervalSec=0
RateLimitBurst=0
RateLimitIntervalSec=0
RateLimitBurst=0
RateLimitIntervalSec=0
RateLimitBurst=0
RateLimitIntervalSec=0
RateLimitBurst=0
I tried to use the parameter backrefs: yes as suggested in above mentioned articles, but it performs idempotency every time, even when there is no any uncommented line.
Do you guys have any suggestions?
I'm using ansible 2.9.0
I'd suggest an alternative approach - use the ini_file module, as settings in journald.conf are INI style key=value (with a section as well). This will simplify the task required and be idempotent as well.
Example:
- name: set cpu affinity settings in systemd
ini_file:
path: /etc/systemd/journald.conf
section: Journal
option: "{{ item.key }}"
value: "{{ item.value }}"
no_extra_spaces: yes
with_dict:
RateLimitIntervalSec: 0
RateLimitBurst: 0
Note: If you want a reference of settings prior to change, add backup: yes to the task.
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All,
My playbook is almost ready. Only the last line with alias is giving me issues. I tried to look at what I am doing wrong in the yaml syntax checker but still not able to find it. Any clue what I am doing wrong? I tried escaping the forward slash but still no luck :(
I am bad at finding the syntax errors in general. So appreciate any clues you folks can provide in finding the problem.
tasks:
- name: Create a KMS key for using the aws cli
command: 'aws kms create-key --profile="{{ aws_profile }}" --region="{{ aws_region }}"'
register: newkeydetails
- name: Display the values for the variable output
set_fact: newkeydetails="{{ newkeydetails.stdout | from_json }}"
- name: Display the value of keyid
debug:
msg: "{{ newkeydetails.KeyMetadata.KeyId }}"
- name: Create a alias name for KMS key using the aws cli
command: 'aws kms create-alias --alias-name 'alias/anothernewkeydetailskey' --target-key-id '"{{ newkeydetails.KeyMetadata.KeyId }}"' --profile="{{ aws_profile }}" --region="{{ aws_region }}"'
The reason for the issue here was due to the usage of single quotes in the last line, as they were not escaped, resulting in parsing errors.
The working solution involves removing unnecessary quotes, resulting in the following:
'aws kms create-alias --alias-name "alias/anothernewkeydetailskey" --target-key-id "{{ newkeydetails.KeyMetadata.KeyId }}" --profile="{{ aws_profile }}" --region="{{ aws_region }}"