Mongodb ERROR: child process failed, exited with error number 51

Question

mongodb was closed by some reason. system shutdown abnormally.

when i try to restart mongodb use:

mongod -f /usr/local/mongodb/etc/mongo.conf

got

about to fork child process, waiting until server is ready for connections.
forked process: 28402
ERROR: child process failed, exited with error number 51
To see additional information in this output, start without the "--fork" option.

mongodb.log:

2019-02-19T13:22:24.105+0800 I CONTROL  [main] ***** SERVER RESTARTED *****
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten] MongoDB starting :     pid=28131 port=27017 dbpath=/usr/local/mongodb/data/mongodata 64-bit     host=nginx.xchs
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten] db version v3.6.2
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten] git version:     489d177dbd0f0420a8ca04d39fd78d0a2c539420
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten] OpenSSL version:         OpenSSL 1.0.1e-fips 11 Feb 2013
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten] allocator: tcmalloc
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten] modules: none
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten] build environment:
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten]     distmod: rhel62
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten]     distarch: x86_64
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten]     target_arch:     x86_64
2019-02-19T13:22:24.112+0800 I CONTROL  [initandlisten] options: { config:     "/usr/local/mongodb/etc/mongo.conf", net: { bindIp: "0.0.0.0" },     processManagement: { fork: true }, storage: { dbPath:     "/usr/local/mongodb/data/mongodata" }, systemLog: { destination: "file",     logAppend: true, path: "/usr/local/mongodb/data/log/mongolog/mongodb.log" } }
2019-02-19T13:22:24.112+0800 W -        [initandlisten] Detected unclean     shutdown - /usr/local/mongodb/data/mongodata/mongod.lock is not empty.
2019-02-19T13:22:24.113+0800 I -        [initandlisten] Detected data files     in /usr/local/mongodb/data/mongodata created by the 'wiredTiger' storage engine,     so setting the active storage engine to 'wiredTiger'.
2019-02-19T13:22:24.113+0800 W STORAGE  [initandlisten] Recovering data from     the last clean checkpoint.
2019-02-19T13:22:24.113+0800 I STORAGE  [initandlisten] 
2019-02-19T13:22:24.113+0800 I STORAGE  [initandlisten] ** WARNING: Using     the XFS filesystem is strongly recommended with the WiredTiger storage engine
2019-02-19T13:22:24.113+0800 I STORAGE  [initandlisten] **          See     http://dochub.mongodb.org/core/prodnotes-filesystem
2019-02-19T13:22:24.113+0800 I STORAGE  [initandlisten] wiredtiger_open     config: create,cache_size=3424M,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),statistics_log=(wait=0),verbose=(recovery_progress),
2019-02-19T13:22:24.602+0800 E STORAGE  [initandlisten] WiredTiger error (0)     [1550553744:602025][28131:0x7f41a84cea80], file:WiredTiger.wt, WT_CURSOR.next: read checksum error for 24576B block at offset 1671168: block header checksum of 3727800471 doesn't match expected checksum of 605632
2019-02-19T13:22:24.602+0800 E STORAGE  [initandlisten] WiredTiger error (0) [1550553744:602085][28131:0x7f41a84cea80], file:WiredTiger.wt, WT_CURSOR.next: WiredTiger.wt: encountered an illegal file format or internal value: (__wt_block_read_off, 227)
2019-02-19T13:22:24.602+0800 E STORAGE  [initandlisten] WiredTiger error (-31804) [1550553744:602097][28131:0x7f41a84cea80], file:WiredTiger.wt, WT_CURSOR.next: the process must exit and restart: WT_PANIC: WiredTiger library panic
2019-02-19T13:22:24.602+0800 F -        [initandlisten] Fatal Assertion 28558 at src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp 361
2019-02-19T13:22:24.602+0800 F -        [initandlisten] 

***aborting after fassert() failure

how to resolve this problem?

Refer to this SO: MongoDB: ERROR: child process failed, exited with error number — LF-DevJourney
– LF-DevJourney, Commented Jul 30, 2020 at 6:43

Brian · Accepted Answer · 2020-01-27 04:26:38Z

1

Open your config file in VIM or in a plain text editor, got to this line:

storage: dbPath: THE_PATH_TO_THE_DIRECTORY_YOU_STORE_YOUR_DB

for example:

/var/mongodb/db/mydb

Go to your terminal to confirm if the path under dbPath exists, type:

ls THE_PATH_TO_THE_DIRECTORY_YOU_STORE_YOUR_DB

for example for my case here:

ls /var/mongodb/db/mydb

If the result is directory does not exist, then just recreate it:

mkdir -p THE_PATH_TO_THE_DIRECTORY_YOU_STORE_YOUR_DB

for example:

mkdir -p /var/mongodb/db/mydb

If you found that the directory exists then it was corrupted during shutdown,as highlighted in the answere above.

Go to your terminal and run the following command:

mongod --dbpath /data/db --repair

Please Refer the above from the Mongo DB Offcial Docs

answered Jan 27, 2020 at 4:26

Brian

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Mani · Accepted Answer · 2019-02-19 07:20:30Z

0

Please Try

mongod --repair --dbpath /path/to/data/db

answered Feb 19, 2019 at 7:20

Mani

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1 Comment

purshell Over a year ago

It doesn't work for me. Got the same log as mongodb.log

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