Mongo no longer connects

Question

MongoDB was running fine, but now it won’t connect. When I run mongo, I get this message:

MongoDB shell version: 3.2.12
connecting to: test
2017-06-23T01:56:34.256-0400 W NETWORK  [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: errno:111 Connection refused
2017-06-23T01:56:34.256-0400 E QUERY    [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:229:14
@(connect):1:6

exception: connect failed

I have tried restarting the mongod service, but that doesn’t help. Can you please guide me on how to debug this issue?

Flamber Hansen · Accepted Answer

@robynover Can you delete this file and then launch mongo service: /tmp/mongodb-27017.sock

When you start mongo directly it starts with default options. If you look at your first error logs, you’ll see it’s set to /var/lib/mongodb

rahul3008bf2a0bdc2938a31cf · Answer

I am getting a same error. deleted /tmp/mongodb-27017.sock file.getting following error: mongod 2019-10-23T08:50:08.484-0400 I CONTROL [initandlisten] MongoDB starting : pid=2756 port=27017 dbpath=/data/db 64-bit host=AEC-logs-mongodb-512mb-nyc3-01 2019-10-23T08:50:08.484-0400 I CONTROL [initandlisten] db version v3.2.19 2019-10-23T08:50:08.484-0400 I CONTROL [initandlisten] git version: a9f574de6a566a58b24d126b44a56718d181e989 2019-10-23T08:50:08.485-0400 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.1f 6 Jan 2014 2019-10-23T08:50:08.485-0400 I CONTROL [initandlisten] allocator: tcmalloc 2019-10-23T08:50:08.485-0400 I CONTROL [initandlisten] modules: none 2019-10-23T08:50:08.485-0400 I CONTROL [initandlisten] build environment: 2019-10-23T08:50:08.485-0400 I CONTROL [initandlisten] distmod: ubuntu1404 2019-10-23T08:50:08.485-0400 I CONTROL [initandlisten] distarch: x86_64 2019-10-23T08:50:08.485-0400 I CONTROL [initandlisten] target_arch: x86_64 2019-10-23T08:50:08.485-0400 I CONTROL [initandlisten] options: {} 2019-10-23T08:50:08.511-0400 I - [initandlisten] Detected data files in /data/db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'. 2019-10-23T08:50:08.512-0400 W - [initandlisten] Detected unclean shutdown - /data/db/mongod.lock is not empty. 2019-10-23T08:50:08.512-0400 W STORAGE [initandlisten] Recovering data from the last clean checkpoint. 2019-10-23T08:50:08.512-0400 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=1G,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),verbose=(recovery_progress), 2019-10-23T08:50:08.566-0400 I STORAGE [initandlisten] dropping unused ident: index-0-3415813987516495599 2019-10-23T08:50:08.567-0400 I STORAGE [initandlisten] dropping unused ident: index-1-3415813987516495599 2019-10-23T08:50:08.567-0400 I STORAGE [initandlisten] dropping unused ident: index-2-3415813987516495599 2019-10-23T08:50:08.568-0400 I STORAGE [initandlisten] dropping unused ident: index-3-3415813987516495599 2019-10-23T08:50:08.568-0400 I STORAGE [initandlisten] dropping unused ident: index-4-3415813987516495599 2019-10-23T08:50:08.569-0400 I STORAGE [initandlisten] dropping unused ident: index-5-3415813987516495599 2019-10-23T08:50:08.570-0400 I STORAGE [initandlisten] dropping unused ident: index-6-3415813987516495599 2019-10-23T08:50:08.571-0400 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended. 2019-10-23T08:50:08.571-0400 I CONTROL [initandlisten] 2019-10-23T08:50:08.571-0400 I - [initandlisten] Fatal assertion 28579 UnsupportedFormat: Unable to find metadata for table:index-1--4778676036905453176 Index: {name: _id_, ns: local.customers} - version too new for this mongod. See http://dochub.mongodb.org/core/3.4-index-downgrade for detailed instructions on how to handle this error. 2019-10-23T08:50:08.572-0400 I - [initandlisten]

robynover · Answer

Thank you @hansen . I don’t have a mongodb.log but I do have mongod.log: 2017-06-23T01:48:28.663-0400 I CONTROL [initandlisten] distmod: ubuntu1604 2017-06-23T01:48:28.663-0400 I CONTROL [initandlisten] distarch: x86_64 2017-06-23T01:48:28.663-0400 I CONTROL [initandlisten] target_arch: x86_64 2017-06-23T01:48:28.663-0400 I CONTROL [initandlisten] options: { config: "/etc/mongod.conf", net: { bindIp: "127.0.0.1", port: 27017 }, storage: { dbPath: "/var/lib/mongodb", journal: { enabled: true } }, systemLog: { destination: "file", logAppend: true, path: "/var/log/mongodb/mongod.log", quiet: true } } 2017-06-23T01:48:28.720-0400 E NETWORK [initandlisten] Failed to unlink socket file /tmp/mongodb-27017.sock errno:1 Operation not permitted 2017-06-23T01:48:28.720-0400 I - [initandlisten] Fatal Assertion 28578 2017-06-23T01:48:28.720-0400 I - [initandlisten] ***aborting after fassert() failure 2017-06-23T01:56:30.912-0400 I CONTROL [main] ***** SERVER RESTARTED ***** 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] MongoDB starting : pid=19105 port=27017 dbpath=/var/lib/mongodb 64-bit host=currency 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] db version v3.2.12 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] git version: ef3e1bc78e997f0d9f22f45aeb1d8e3b6ac14a14 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.2g 1 Mar 2016 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] allocator: tcmalloc 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] modules: none 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] build environment: 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] distmod: ubuntu1604 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] distarch: x86_64 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] target_arch: x86_64 2017-06-23T01:56:30.930-0400 I CONTROL [initandlisten] options: { config: "/etc/mongod.conf", net: { bindIp: "127.0.0.1", port: 27017 }, storage: { dbPath: "/var/lib/mongodb", journal: { enabled: true } }, systemLog: { destination: "file", logAppend: true, path: "/var/log/mongodb/mongod.log", quiet: true } } 2017-06-23T01:56:30.976-0400 E NETWORK [initandlisten] Failed to unlink socket file /tmp/mongodb-27017.sock errno:1 Operation not permitted 2017-06-23T01:56:30.976-0400 I - [initandlisten] Fatal Assertion 28578 2017-06-23T01:56:30.976-0400 I - [initandlisten] ***aborting after fassert() failure

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Mongo no longer connects

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