keywords: MongoDB, Common Issues Collection

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Usages

Install MongoDB on CentOS

1, Config Yum repository for MongoDB

sudo vi /etc/yum.repos.d/mongodb-org-4.4.repo

Append following contents:

[mongodb-org-4.4]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.4/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.4.asc

2, Install MongoDB

sudo yum install mongodb-org

This command will automatically install MongoDB related components and dependencies.

3, Conifg MongoDB

Enable MongoDB service:

sudo systemctl enable mongod.service

Startup MongoDB service:

sudo systemctl start mongod.service

Stop MongoDB service:

sudo systemctl stop mongod.service

Check MongoDB service status:

sudo systemctl status mongod.service

Modify MongoDB profile path:
/etc/mongod.conf

4, Connect MongoDB

mongo

Origin: centos 安装mongodb
https://www.cnblogs.com/huamoai/p/17496672.html

Change MongoDB data store directory

modify /etc/mongod.conf:

storage:
    dbPath: "/usr/local/var/mongodb"

Issues

libc.so.6: version `GLIBC_2.32’ not found
$ mongorestore --version
>> mongorestore: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by mongorestore)
>> mongorestore: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by mongorestore)

Solution:
This’s because the Linux OS version is lower, but the MongoDB version is higher, since MongoDB requires a newer compilation environment.
Although there are many articles saying that GLIBC can be upgraded, it’s not recommended because using a higher GLIBC on a lower Linux system may cause some unexpected problems.

error while loading shared libraries: libcrypto.so.1.1
mongod: error while loading shared libraries: libcrypto.so.1.1: cannot open shared object file: No such file or directory

Solution:
Download openssl 1.1 and compile it.
Then copy so into /usr/local/lib64/:

sudo cp libssl.so.1.1 /usr/local/lib64/
sudo cp libcrypto.so.1.1 /usr/local/lib64/

Then append directory in /etc/ld.so.conf:

sudo vim /etc/ld.so.conf

content:

# include directories
/usr/local/lib64/

Refresh config:

sudo ldconfig

Origin:
https://www.cnblogs.com/tllb/p/16122647.html

NonExistentPath: Data directory /data/db not found
"error":"NonExistentPath: Data directory /data/db not found. Create the missing directory or specify another path using (1) the --dbpath command line option, or (2) by adding the 'storage.dbPath' option in the configuration file."

Solution:

sudo mkdir -p /data/db/
sudo chown $(id -u) /data/db

Origin:
https://askubuntu.com/a/1264578/1476756

战国战争史：秦韩魏伊阙之战
伊阙之战，发生在周赧王二十二年（前293年），石窟开凿前的洛阳龙门。秦国为打开东进中原通道，由大将白起率秦军在伊阙龙门大破魏韩24万联军，彻底扫平秦军东进之路，可谓白起的成名之战。
战争中，秦将白起针对韩、魏两军互相观望，不愿率先出击的弱点，以少量兵力钳制联军的主力韩军，以主力猛攻较弱的魏军。魏军无备，仓促应战，迅即惨败。韩军震慑，且翼侧暴露，遭秦军夹击，溃败而逃。白起乘胜挥师追击，全歼韩魏联军24万人，攻占伊阙，夺取魏城数座及韩国安邑以东大部分地区。魏、韩两国割地求和。
战后，韩国精锐损失殆尽。秦国则以不可抗拒之势向东进击。