I have this URL string server https://test.example.com:6443. I need to extract only hostname test from it using Ansible task.
came up with this playbook, Is there a better way of doing this with-out using sed?
- hosts: localhost
connection: local
gather_facts: no
tasks:
- name: get the URL
shell: echo 'server https://test.example.com:6443' |sed -e 's/^.*https...//' -e 's/\..*$//'
register: result
- name: Print the var
debug:
msg: "{{ result.stdout }}"
Output
PLAY [localhost] *********************************************************************************************************************
TASK [get the URL] *******************************************************************************************************************
changed: [localhost]
TASK [Print the var] *****************************************************************************************************************
ok: [localhost] => {
"msg": "test"
}
PLAY RECAP ***************************************************************************************************************************
localhost : ok=2 changed=1 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
You can use split on the URL name and get the desired value, Ideally hostname should be test.example.com in your case. However, you can customize the split function based on your need also as below.
- hosts: localhost
connection: local
gather_facts: no
vars:
url: "https://test.example.com:6443"
tasks:
- name: Print the hostname var
debug:
msg: "{{ url.split(':')[1].split('//')[1] }}"
- name: Print the subdomain prefix
debug:
msg: "{{ url.split(':')[1].split('//')[1].split('.')[0] }}"
Related
I have following inventory file
$ cat hosts
[web]
server1.example.com
server2.example.com
I would like to fetch the hostname, without the part of domain (.example.com).
I tried with the following playbook, however, it is still fetching with the entire hostname..
$ playbook.yaml
- hosts: localhost
tasks:
- debug:
msg: "{{ groups['web'] }}"
Output
PLAY [localhost] *************************************************************************************************************************************************************
TASK [Gathering Facts] *******************************************************************************************************************************************************
ok: [localhost]
TASK [debug] *****************************************************************************************************************************************************************
ok: [localhost] => {
"msg": [
"server1.example.com"
"server2.example.com"
]
}
PLAY RECAP *******************************************************************************************************************************************************************
localhost : ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
Expected output
PLAY [localhost] *************************************************************************************************************************************************************
TASK [Gathering Facts] *******************************************************************************************************************************************************
ok: [localhost]
TASK [debug] *****************************************************************************************************************************************************************
ok: [localhost] => {
"msg": [
"server1"
"server2"
]
}
PLAY RECAP *******************************************************************************************************************************************************************
localhost : ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
You can get what you want from a magic variable called inventory_hostname_short which basically returns anything before the first . found in the inventory_hostname.
To get this in a normal play host loop, it's as easy as:
- hosts: all
tasks:
- name: show target short name
debug:
var: inventory_hostname_short
If you need to get that for hosts not in the host loop, you will have to go through hostvars. Here is an example to get all those names in a list for a given group running from localhost:
- hosts: localhost
gather_facts: false
tasks:
- name: show list of shortnames for group 'toto'
debug:
msg: "{{ groups['toto'] | map('extract', hostvars, 'inventory_hostname_short') }}"
An other example to get that name only for the first server in group 'toto'
- hosts: localhost
gather_facts: false
tasks:
- name: show shortnames for first server in group 'toto'
vars:
server_name: "{{ groups['toto'][0] }}"
debug:
msg: "{{ hostvars[server_name].inventory_hostname_short }}"
ansible version: 2.9.16 running on RHEL 7.9 python ver = 2.7.5 targeting windows 2016 servers. ( should behave the same for linux target servers too)
EDIT: Switched to using host specific variables in inventory to avoid confusion that Iam just trying to print hostnames of a group. Even here its a gross simplification. Pretend that var1 is obtained dynamically for each server instead of being declared in the inventory file.
My playbook has two plays. One targets 3 remote servers ( Note: serial: 0 i.e Concurrently ) and another just the localhost. In play1 I am trying to delegate facts obtained from each of these hosts to the localhost using delegate_facts and delegate_to. The intent is to have these facts delegated to a single host ( localhost ) so I can use it later in a play2 (using hostvars) that targets the localhost. But strangely thats not working. It only has information from the last host from Play1.
Any help will be greatly appreciated.
my inventory file inventory/test.ini looks like this:
[my_servers]
svr1 var1='abc'
svr2 var1='xyz'
svr3 var1='pqr'
My Code:
## Play1
- name: Main play that runs against multiple remote servers and builds a list.
hosts: 'my_servers' # my inventory group that contains 3 servers svr1,svr2,svr3
any_errors_fatal: false
ignore_unreachable: true
gather_facts: true
serial: 0
tasks:
- name: initialize my_server_list as a list and delegate to localhost
set_fact:
my_server_list: []
delegate_facts: yes
delegate_to: localhost
- command: /root/complex_script.sh
register: result
- set_fact:
my_server_list: "{{ my_server_list + hostvars[inventory_hostname]['result.stdout'] }}"
# run_once: true ## Commented as I need to query the hostvars for each host where this executes.
delegate_to: localhost
delegate_facts: true
- name: "Print list - 1"
debug:
msg:
- "{{ hostvars['localhost']['my_server_list'] | default(['NotFound']) | to_nice_yaml }}"
# run_once: true
- name: "Print list - 2"
debug:
msg:
- "{{ my_server_list | default(['NA']) }}"
## Play2
- name: Print my_server_list which was built in Play1
hosts: localhost
gather_facts: true
serial: 0
tasks:
- name: "Print my_server_list without hostvars "
debug:
msg:
- "{{ my_server_list | to_nice_json }}"
# delegate_to: localhost
- name: "Print my_server_list using hostvars"
debug:
msg:
- "{{ hostvars['localhost']['my_server_list'] | to_nice_yaml }}"
# delegate_to: localhost
###Output###
$ ansible-playbook -i inventory/test.ini delegate_facts.yml
PLAY [Main playbook that runs against multiple remote servers and builds a list.] ***********************************************************************************************************
TASK [Gathering Facts] **********************************************************************************************************************************************************************
ok: [svr3]
ok: [svr1]
ok: [svr2]
TASK [initialize] ***************************************************************************************************************************************************************************
ok: [svr1]
ok: [svr2]
ok: [svr3]
TASK [Build a list of servers] **************************************************************************************************************************************************************
ok: [svr1]
ok: [svr2]
ok: [svr3]
TASK [Print list - 1] ***********************************************************************************************************************************************************************
ok: [svr1] =>
msg:
- |-
- pqr
ok: [svr2] =>
msg:
- |-
- pqr
ok: [svr3] =>
msg:
- |-
- pqr
TASK [Print list - 2] ***********************************************************************************************************************************************************************
ok: [svr1] =>
msg:
- - NA
ok: [svr2] =>
msg:
- - NA
ok: [svr3] =>
msg:
- - NA
PLAY [Print my_server_list] *****************************************************************************************************************************************************************
TASK [Gathering Facts] **********************************************************************************************************************************************************************
ok: [localhost]
TASK [Print my_server_list without hostvars] ************************************************************************************************************************************************
ok: [localhost] =>
msg:
- |-
[
"pqr"
]
TASK [Print my_server_list using hostvars] **************************************************************************************************************************************************
ok: [localhost] =>
msg:
- |-
- pqr
PLAY RECAP **********************************************************************************************************************************************************************************
localhost : ok=3 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
svr1 : ok=5 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
svr2 : ok=5 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
svr3 : ok=5 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
Playbook run took 0 days, 0 hours, 0 minutes, 13 seconds
###Expected Output###
I was expecting the last two debug statements in Play2 to contain the values of var1 for all the servers something like this:
TASK [Print my_server_list using hostvars] **************************************************************************************************************************************************
ok: [localhost] =>
msg:
- |-
- abc
- xyz
- pqr
Use Special Variables, e.g.
- hosts: all
gather_facts: false
tasks:
- set_fact:
my_server_list: "{{ ansible_play_hosts_all }}"
run_once: true
delegate_to: localhost
delegate_facts: true
- hosts: localhost
gather_facts: false
tasks:
- debug:
var: my_server_list
gives
ok: [localhost] =>
my_server_list:
- svr1
- svr2
- svr3
There are many other ways how to create the list, e.g.
- hosts: all
gather_facts: false
tasks:
- debug:
msg: "{{ groups.my_servers }}"
run_once: true
- hosts: all
gather_facts: false
tasks:
- debug:
msg: "{{ hostvars|json_query('*.inventory_hostname') }}"
run_once: true
Q: "Fill the list with outputs gathered by running complex commands."
A: Last example above shows how to create a list from hostvars. Register the result from the complex command, e.g.
shell> ssh admin#srv1 cat /root/complex_script.sh
#!/bin/sh
ifconfig wlan0 | grep inet | cut -w -f3
The playbook
- hosts: all
gather_facts: false
tasks:
- command: /root/complex_script.sh
register: result
- set_fact:
my_server_list: "{{ hostvars|json_query('*.result.stdout') }}"
run_once: true
delegate_to: localhost
delegate_facts: true
- hosts: localhost
gather_facts: false
tasks:
- debug:
var: my_server_list
gives
my_server_list:
- 10.1.0.61
- 10.1.0.62
- 10.1.0.63
Q: "Why the logic of delegating facts to localhost and keep appending them to that list does not work?"
A: The code below (simplified) can't work because the right-hand-side msl value still comes from the hostvars of the inventory_host despite the fact delegate_facts: true. This merely puts the created variable msl into the localhost's hostvars
- hosts: my_servers
tasks:
- set_fact:
msl: "{{ msl|default([]) + [inventory_hostname] }}"
delegate_to: localhost
delegate_facts: true
Quoting from Delegating facts
To assign gathered facts to the delegated host instead of the current host, set delegate_facts to true
As a result of such code, the variable msl will keep the last assigned value only.
I have a play like this:
- name: Perform an action on a Runtime
hosts: all
roles:
- role: mule_action_on_Runtime
A variable at invocation (--extra-vars 'mule_runtime=MuleS01-3.7.3-Testing') has a prefix of the host needed (MuleS01). I want to set hosts: MuleS01. How do I do this?
Given that your pattern is always PartIWant-PartIDonCareAbout-AnotherPartAfterOtherDash you could use the split method of Python, then get the first item of the list via the Jinja filter first.
Here is full working playbook as example:
- hosts: local
gather_facts: no
tasks:
- debug:
msg: "{{ mule_runtime.split('-') | first }}"
This yield the recap:
play.yml --extra-vars 'mule_runtime=MuleS01-3.7.3-Testing'
PLAY [local] *******************************************************************
TASK [debug] *******************************************************************
ok: [local] => {
"msg": "MuleS01"
}
PLAY RECAP *********************************************************************
local : ok=1 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
With the inventory
shell> cat hosts
MuleS01
MuleS02
MuleS03
this playbook
shell> cat pb.yml
- hosts: all
tasks:
- debug:
msg: Set {{ mule_runtime }}
when: mule_runtime.split('-').0 == inventory_hostname
gives
skipping: [MuleS02]
ok: [MuleS01] => {
"msg": "Set MuleS01-3.7.3-Testing"
}
skipping: [MuleS03]
I want to create a list from comma separated string to pass to loop in ansible, sometime variable can have only one value also
var1=test1,test2 and it can be var1=test1 also
here is my code
- name: Separate facts
set_fact: groups="{{ var1.split(',') }}"
- name: delete
gcp_compute_instance_group:
name: "{{ item }}"
zone: xxx
project: xxx
auth_kind: serviceaccount
service_account_file: xxx
state: absent
loop: "{{ groups }}"
this doesn't work, how can i achieve my requirement
your filter is correct, you do get a list variable. please see below PB and output:
---
- hosts: localhost
gather_facts: false
vars:
var1: test1,test2
var2: test3
tasks:
- name: Create the list
set_fact:
list_var1: "{{ var1.split(',') }}"
list_var2: "{{ var2.split(',') }}"
- debug:
var: list_var1
- debug:
var: list_var2
result:
[is#orangehat-29 temp]$ ansible-playbook test.yml
[WARNING]: provided hosts list is empty, only localhost is available. Note that the implicit localhost does not match 'all'
PLAY [localhost] ***********************************************************************************************************************************************************************************************************************
TASK [Create the list] *****************************************************************************************************************************************************************************************************************
ok: [localhost]
TASK [debug] ***************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
"list_var1": [
"test1",
"test2"
]
}
TASK [debug] ***************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
"list_var2": [
"test3"
]
}
PLAY RECAP *****************************************************************************************************************************************************************************************************************************
localhost : ok=3 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
[is#orangehat-29 temp]$
I have a path which looks like this -
base_dir/123/path/to/G\$/subdirectory/html/
When I try to set this path in Ansible playbook, it throws error. If add \$ to escape '\', it throws unexpected failure error.
Playbkook -
- hosts: localhost
vars:
account_id: 123
tasks:
- name: Add \ to path
debug:
var: "base_dir/{{ account_id }}/path/to/G\\$/subdirectory/html/"
Result -
TASK [Gathering Facts] *************************************************************************************************************************************************
task path: /playbooks/example_path.yml:2
ok: [localhost]
META: ran handlers
TASK [Add \ to path] ***************************************************************************************************************************************************
task path: /playbooks/exmaple_path.yml:6
fatal: [localhost]: FAILED! => {
"msg": "Unexpected failure during module execution."
}
PLAY RECAP *************************************************************************************************************************************************************
localhost : ok=1 changed=0 unreachable=0 failed=1
As explained in the debug module documentation, the var option is expecting a variable name, not a scalar for output. You are getting an error because \ is not expected in a variable name. Running the playbook with -vvv will give you a little more explanations.
In this case you need to use the msg option.
- hosts: localhost
gather_facts: false
vars:
account_id: 123
tasks:
- name: Add \ to path
debug:
msg: "base_dir/{{ account_id }}/path/to/G\\$/subdirectory/html/"
Result
PLAY [localhost] ***************************************************************
TASK [Add \ to path] ***********************************************************
ok: [localhost] => {
"msg": "base_dir/123/path/to/G\\$/subdirectory/html/"
}
PLAY RECAP *********************************************************************
localhost : ok=1 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
The next option is to use the Single-Quoted Style. See the example below
- hosts: localhost
vars:
my_dir1: "/scratch/tmp/G1\\$"
my_dir2: '/scratch/tmp/G2\$'
tasks:
- file:
state: directory
path: "{{ item }}"
loop:
- "{{ my_dir1 }}"
- "{{ my_dir2 }}"
# ls -1 /scratch/tmp/
'G1\$'
'G2\$'