how to run a shell command within a playbook repeatedly

[Hareesh Vn]

Hi Team

Below is problem description on which i need help.

I am adding single mongo db shards by running below shell command -- this is working fine to install on one server

   - name: "Creating the database"

     command: "sh /tmp/add_shard.sh {{item}} {{mongo_user}} {{mongo_password}}" 

     register: mongo_db_shard_add

     ignore_errors: true

    with_items: "{{P_NODE}}"

    when: ansible_default_ipv4_address ==== "{{item}}"

here my Question : 

Now i want to run add mutiple shards on multiple servers (example: add 3 shards on each servers). So how to change above code?

Basically , i want to run below command repeatedly in loop for "n' number of time where n=number of shards to be added.

Also i should pass 'n' as input while running playbook

   command: "sh /tmp/add_shard.sh {{item}} {{mongo_user}}  {{mongo_password}} {{n}}" 

where "n" is number of shards to be created"

Thanks

Hareesh

[Jorge Rúa]

You can define a data structure, a dict for example containing number of shards per server an individual shard settings etc. Then just use with_sequence to iterate from 1 to length of the aforementioned shards list.

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[Hareesh Vn]

can you please help me changing below code as per your suggestion of with_sequence?

  - name: "Creating the database"

     command: "sh /tmp/add_shard.sh {{item}} {{mongo_user}} {{mongo_password}}" 

     register: mongo_db_shard_add

     ignore_errors: true

    with_items: "{{P_NODE}}"

    when: ansible_default_ipv4_address ==== "{{item}}"

[Jorge Rúa]

I would not run a shell script with the command module. You should use the script module instead. But ideally if you have the option use the mongodb_shard module. 

This piece of code actually uses with_sequence to illustrate how to generate a sequence of numbers that will then used to populate port numbers dynamically:

---

- name: Add shards

hosts: localhost

connection: local

gather_facts: false

vars:

start_port: 10000

total_shards: 3

tasks:

- name: Add mongodb shards

community.mongodb.mongodb_shard:

login_user: admin

login_password: admin

shard: "localhost:{{ item|int + start_port }}"

state: present

with_sequence: start=0 end="{{ total_shards - 1 }}"

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