Mongodb啟用問題

有時候不正常關機或不明原因導致mongoDB停止
接著重新啟用mongoDB時，就叫不醒了
但執行啟用mongoDB指令時，也沒有出現特別的錯誤，還跟你說啟用了!!?

1	$ sudo start mongod

mongod start/running, process 1660
看起來是啟用了阿~~~

但察看網路服務狀況，仍然沒有出現mongoDB開啟的port

1 2	$ netstat -tpnl 預設應該要有27017的port

這時查看mongoDB的log就能清楚為什麼了

1	$ more /var/log/mongodb/mongod.log

I CONTROL * SERVER RESTARTED *
W - [initandlisten] Detected unclean shutdown - /var/lib/mongodb/mongod.lock is not empty.
I STORAGE [initandlisten] exception in initAndListen: 98 Unable to create/open lock file: /var/lib/mongodb/mongod.lock errno:13 Permission denied Is a mongod instance already running?, terminating
I CONTROL [initandlisten] dbexit: rc: 100

可以看到/var/lib/mongodb/mongod.lock並沒有被清除，有可能是不正常停用的關係
先把他清除試試看

1	$ sudo rm /var/lib/mongodb/mongod.lock

在重跑一次啟用指令

1	$ sudo start mongod

察看網路服務狀況

1 2	$ netstat -tpnl 預設應該要有27017的port

如果仍然沒有，就在看一次mongoDB log

1	$ more /var/log/mongodb/mongod.log

I CONTROL * SERVER RESTARTED *
E NETWORK [initandlisten] Failed to unlink socket file /tmp/mongodb-27017.sock errno:1 Operation not permitted
I - [initandlisten] Fatal Assertion 28578
I - [initandlisten]

這時候又有新的錯誤訊息，沒有權限去刪除/tmp/mongodb-27017.sock
那一樣把他刪掉吧

1	$ sudo rm /tmp/mongodb-27017.sock

再試一次!

1	$ sudo start mongod

查看網路服務狀況

1	$ netstat -tpnl

預設應該要有27017的port, 應該就會有了!

(Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.)
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:389 0.0.0.0:* LISTEN -

查看log

1	$ more /var/log/mongodb/mongod.log

I CONTROL * SERVER RESTARTED *
I STORAGE [initandlisten] wiredtiger_open config: …
I CONTROL [initandlisten] MongoDB starting : pid=1533 port=27017 dbpath=/var/lib/mongodb 64-bit host=ubuntu-mongodb
I CONTROL [initandlisten] db version v3.0.2
I CONTROL [initandlisten] git version: xx
I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.1f 6 Jan 2014
I CONTROL [initandlisten] build info: Linux
I CONTROL [initandlisten] allocator: tcmalloc
I CONTROL [initandlisten] options: { config: “/etc/mongod.conf”, net: { bindIp: “0.0.0.0”, port: 27017 }, processManagement: { fork: true }, storage: { dbPath: “/var/lib/mongodb”, engine: “wiredTiger”, journal: { enabled: true }, wiredTiger: { collectionConfig: { blockCompressor: “snappy” } } }, systemLog: { destination: “file”, logAppend: true, path: “/var/log/mongodb/mongod.log” } }
I NETWORK [initandlisten] waiting for connections on port 27017

最後一行，在等待連線了，看來沒問題了！