Cannot connect to mongodb errno:61 Connection refused

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

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.