Cannot connect to mongodb errno:61 Connection refu

Question

I recently installed mongodb-2.6.0 with Homebrew. After successfully installed, I tried to connect using the mongo command. I am receiving the following errors which do not allow me to connect:

Failed to connect to 127.0.0.1:27017, reason: errno:61 Connection refused

Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed at src/mongo/shell/mongo.js:146

exception: connect failed

Answer 1

If you have already installed MongoDB then first try to run mongod as a sudo user, I was facing the issue because of not running mongod as a superuser.

I have pasted the o/p for both the commands(mongod and sudo mongod) at very bottom, you can check that too but

First try this

sudo mongod

not this

mongod

I had installed MongoDB on my MAC OS X Sierra 10.12.6 by by running the following command in sequence.

brew update
brew install mongodb --devel
brew services start mongodb

then created a directory to which mongod process will write the data, this is optional as mongod process takes it by default, see this useful guide at https://docs.mongodb.com/manual/tutorial/install-mongodb-on-os-x/

sudo mkdir -p /data/db

Finally started mongod process as follows

sudo mongod

Oputput of mongod (failed) and sudo mongod (succeeded) commands on my terminal.

MacBook-Pro-2:appscheck admin$ mongod
2017-12-10T08:12:06.166+0530 I CONTROL  [initandlisten] MongoDB starting : pid=2698 port=27017 dbpath=/data/db 64-bit host=MacBook-Pro-2.local
2017-12-10T08:12:06.166+0530 I CONTROL  [initandlisten] db version v3.4.10
2017-12-10T08:12:06.166+0530 I CONTROL  [initandlisten] git version: 078f28920cb24de0dd479b5ea6c66c644f6326e9
2017-12-10T08:12:06.166+0530 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.2n  7 Dec 2017
2017-12-10T08:12:06.166+0530 I CONTROL  [initandlisten] allocator: system
2017-12-10T08:12:06.166+0530 I CONTROL  [initandlisten] modules: none
2017-12-10T08:12:06.166+0530 I CONTROL  [initandlisten] build environment:
2017-12-10T08:12:06.166+0530 I CONTROL  [initandlisten]     distarch: x86_64
2017-12-10T08:12:06.166+0530 I CONTROL  [initandlisten]     target_arch: x86_64
2017-12-10T08:12:06.166+0530 I CONTROL  [initandlisten] options: {}
2017-12-10T08:12:06.166+0530 I STORAGE  [initandlisten] exception in initAndListen: 20 Attempted to create a lock file on a read-only directory: /data/db, terminating
2017-12-10T08:12:06.166+0530 I NETWORK  [initandlisten] shutdown: going to close listening sockets...
2017-12-10T08:12:06.166+0530 I NETWORK  [initandlisten] shutdown: going to flush diaglog...
2017-12-10T08:12:06.167+0530 I CONTROL  [initandlisten] now exiting
2017-12-10T08:12:06.167+0530 I CONTROL  [initandlisten] shutting down with code:100


MacBook-Pro-2:appscheck admin$ sudo mongod
Password:
2017-12-10T08:12:14.084+0530 I CONTROL  [initandlisten] MongoDB starting : pid=2700 port=27017 dbpath=/data/db 64-bit host=MacBook-Pro-2.local
2017-12-10T08:12:14.084+0530 I CONTROL  [initandlisten] db version v3.4.10
2017-12-10T08:12:14.084+0530 I CONTROL  [initandlisten] git version: 078f28920cb24de0dd479b5ea6c66c644f6326e9
2017-12-10T08:12:14.084+0530 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.2n  7 Dec 2017
2017-12-10T08:12:14.084+0530 I CONTROL  [initandlisten] allocator: system
2017-12-10T08:12:14.084+0530 I CONTROL  [initandlisten] modules: none
2017-12-10T08:12:14.084+0530 I CONTROL  [initandlisten] build environment:
2017-12-10T08:12:14.084+0530 I CONTROL  [initandlisten]     distarch: x86_64
2017-12-10T08:12:14.084+0530 I CONTROL  [initandlisten]     target_arch: x86_64
2017-12-10T08:12:14.084+0530 I CONTROL  [initandlisten] options: {}
2017-12-10T08:12:14.084+0530 I STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=7680M,session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] 
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] 
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] 
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
2017-12-10T08:12:14.560+0530 I FTDC     [initandlisten] Initializing full-time diagnostic data capture with directory '/data/db/diagnostic.data'
2017-12-10T08:12:14.707+0530 I INDEX    [initandlisten] build index on: admin.system.version properties: { v: 2, key: { version: 1 }, name: "incompatible_with_version_32", ns: "admin.system.version" }
2017-12-10T08:12:14.707+0530 I INDEX    [initandlisten]      building index using bulk method; build may temporarily use up to 500 megabytes of RAM
2017-12-10T08:12:14.719+0530 I INDEX    [initandlisten] build index done.  scanned 0 total records. 0 secs
2017-12-10T08:12:14.720+0530 I COMMAND  [initandlisten] setting featureCompatibilityVersion to 3.4
2017-12-10T08:12:14.720+0530 I NETWORK  [thread1] waiting for connections on port 27017

Then I opened new terminal to start querying the MongoDB, it worked.

MacBook-Pro-2:appscheck admin$ mongo
MongoDB shell version v3.4.10
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.10
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
    http://docs.mongodb.org/
Questions? Try the support group
    http://groups.google.com/group/mongodb-user
Server has startup warnings: 
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] 
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] 
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] 
2017-12-10T08:12:14.472+0530 I CONTROL  [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
> show dbs;
admin  0.000GB
local  0.000GB
> use practice
switched to db practice
>

That's it.

Answer 2

It can happen when the mongodb service is not running on the mac. To start it, I tried

brew services start mongodb

and it worked.

Edit: According to the discussion on this PR on homebrew: https://github.com/Homebrew/homebrew/issues/30628

brew services is deprecated, I looked around on SO and found these answers now answer the question: What is the correct way to start a mongod service on linux / OS X?

Answer 3

In another tab, you can start the mongo shell with

mongod

Then return to the previous tab and try again. If you're having trouble setting up your mongoshell, check out this link on the mongo shell: http://docs.mongodb.org/manual/tutorial/manage-mongodb-processes/ or this link on installing mongodb: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-os-x/

Answer 4

My similar error is resolved by deleting "sudo rm /data/db/mongod.lock" file while trying to run mongod. Now u can run mongod and then mongo.

Answer 5

I was having the same issue when calling mongod from the command line.

I resolved this by calling instead sudo mongod.