ERROR Configuring mongoDB using Ansible (MongoNetworkError: connect ECONNREFUSED) - mongodb

Question

I'm trying to configure a replicaset of mongodb using ansible,
I succeeded to install mongoDB on the primary server and created the replica-set configuration file except when I launch the playbook, I get an error of type: MongoNetworkError: connect ECONNREFUSED 3.142.150.62:28041
Does anyone have an idea please how to solve this?
attached, the playbook and the error on the Jenkins console
Playbook:
---
- name: Play1
hosts: hhe
#connection: local
become: true
#remote_user: ec2-user
#remote_user: root
tasks:
- name: Install gnupg
package:
name: gnupg
state: present
- name: Import the public key used by the package management system
shell: wget -qO - https://www.mongodb.org/static/pgp/server-5.0.asc | sudo apt-key add -
- name: Create a list file for MongoDB
shell: echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/5.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-5.0.list
- name: Reload local package database
command: sudo apt-get update
- name: Installation of mongodb-org
package:
name: mongodb-org
state: present
update_cache: yes
- name: Start mongodb
service:
name: mongod
state: started
enabled: yes
- name: Play2
hosts: hhe
become: true
tasks:
- name: create directories on all the EC2 instances
shell: mkdir -p replicaset/member
- name: Play3
hosts: secondary1
become: true
tasks:
- name: Start mongoDB with the following command on secondary1
shell: nohup mongod --port 28042 --bind_ip localhost,ec2-18-191-39-71.us-east-2.compute.amazonaws.com --replSet replica_demo --dbpath replicaset/member &
- name: Play4
hosts: secondary2
become: true
tasks:
- name: Start mongoDB with the following command on secondary2
shell: nohup mongod --port 28043 --bind_ip localhost,ec2-18-221-31-81.us-east-2.compute.amazonaws.com --replSet replica_demo --dbpath replicaset/member &
- name: Play5
hosts: arbiter
become: true
tasks:
- name: Start mongoDB with the following command on arbiter
shell: nohup mongod --port 27018 --bind_ip localhost,ec2-13-58-35-255.us-east-2.compute.amazonaws.com --replSet replica_demo --dbpath replicaset/member &
- name: Play6
hosts: primary
become: true
tasks:
- name: Start mongoDB with the following command on primary
shell: nohup mongod --port 28041 --bind_ip localhost,ec2-3-142-150-62.us-east-2.compute.amazonaws.com --replSet replica_demo --dbpath replicaset/member &
- name: Create replicaset initialize file
copy:
dest: /tmp/replicaset_conf.js
mode: "u=rw,g=r,o=rwx"
content: |
var cfg =
{
"_id" : "replica_demo",
"version" : 1,
"members" : [
{
"_id" : 0,
"host" : "3.142.150.62:28041"
},
{
"_id" : 1,
"host" : "18.191.39.71:28042"
},
{
"_id" : 2,
"host" : "18.221.31.81:28043"
}
]
}
rs.initiate(cfg)
- name: Pause for a while
pause: seconds=20
- name: Initialize the replicaset
shell: mongo /tmp/replicaset_conf.js
The error on Jenkins Consol:
PLAY [Play6] *******************************************************************
TASK [Gathering Facts] *********************************************************
ok: [primary]
TASK [Start mongoDB with the following command on primary] *********************
changed: [primary]
TASK [Create replicaset initialize file] ***************************************
ok: [primary]
TASK [Pause for a while] *******************************************************
Pausing for 20 seconds
(ctrl+C then 'C' = continue early, ctrl+C then 'A' = abort)
ok: [primary]
TASK [Initialize the replicaset] ***********************************************
fatal: [primary]: FAILED! => {"changed": true, "cmd": "/usr/bin/mongo 3.142.150.62:28041 /tmp/replicaset_conf.js", "delta": "0:00:00.146406", "end": "2022-08-11 09:46:07.195269", "msg": "non-zero return code", "rc": 1, "start": "2022-08-11 09:46:07.048863", "stderr": "", "stderr_lines": [], "stdout": "MongoDB shell version v5.0.10\nconnecting to: mongodb://3.142.150.62:28041/test?compressors=disabled&gssapiServiceName=mongodb\nError: couldn't connect to server 3.142.150.62:28041, connection attempt failed: SocketException: Error connecting to 3.142.150.62:28041 :: caused by :: Connection refused :\nconnect#src/mongo/shell/mongo.js:372:17\n#(connect):2:6\nexception: connect failed\nexiting with code 1", "stdout_lines": ["MongoDB shell version v5.0.10", "connecting to: mongodb://3.142.150.62:28041/test?compressors=disabled&gssapiServiceName=mongodb", "Error: couldn't connect to server 3.142.150.62:28041, connection attempt failed: SocketException: Error connecting to 3.142.150.62:28041 :: caused by :: Connection refused :", "connect#src/mongo/shell/mongo.js:372:17", "#(connect):2:6", "exception: connect failed", "exiting with code 1"]}

Answer 1

You start the service already with
service:
name: mongod
state: started
enabled: yes
thus shell: nohup mongod ... & is pointless. You cannot start the mongod service multiple times, unless you use different port and dbPath. You should prefer to start the mongod as service, i.e. systemctl start mongod or similar instead of nohup mongod ... &. I prefer to use the configuration file (typically /etc/mongod.conf) rather than command line options.
Plain mongo command uses the default port 27017, i.e. it does not connect to the MongoDB instances you started in above task.
You should wait till replica set is initated. You can do it like this:
content: |
var cfg =
{
"_id" : "replica_demo",
"version" : 1,
"members" : [
{
"_id" : 0,
"host" : "3.142.150.62:28041"
},
{
"_id" : 1,
"host" : "18.191.39.71:28042"
},
{
"_id" : 2,
"host" : "18.221.31.81:28043"
}
]
}
rs.initiate(cfg)
while (! db.hello().isWritablePrimary ) { sleep(1000) }
You configured an ARBITER. However, an arbiter node is useful only with an even number of Replica Set members. With 3 members it does not make much sense. Anyway, you don't add the arbiter to your Replica Set, so what is the reason to define it?
Just a note, you don't have to create a temp file, you can execute script directly, e.g. similar to this:
shell:
cmd: mongo --eval '{{ script }}'
executable: /bin/bash
vars:
script: |
var cfg =
{
"_id" : "replica_demo",
...
}
rs.initiate(cfg)
while (! db.hello().isWritablePrimary ) { sleep(1000) }
print(rs.status().ok)
register: ret
failed_when: ret.stdout_lines | last != "1"
Be aware of correct quoting.