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This article will explain in detail about Mongodb parameter description and common error handling example analysis, Xiaobian thinks it is quite practical, so share it with you as a reference, I hope you can gain something after reading this article.

Examples:

Install MongoDB on CentOS 7

1 Connect to CentOS7 server via SecureCRT;

2 Go to/usr/local/directory:

cd /usr/local

3 Create the tools directory under the current directory:

mkdir -p tools

4 Enter the Tools directory:

cd tools

5 Download the mongodb-linux-x86_64-rhel70-3.2.4.tgz file for CentOS:

wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel70-3.2.4.tgz

Unzip mongodb-linux-x86_64-rhel70-3.2.4.tgz file:

tar -zxvf mongodb-linux-x86_64-rhel70-3.2.4.tgz

After decompression, the mongodb-linux-x86_64-rhel70 -3.2.4 folder and its files are obtained;

7 Rename mongodb-linux-x86_64-rhel70-3.2.4 file to mongodb3.2.4:

mv mongodb-linux-x86_64-rhel70-3.2.4 mongodb3.2.4

8 Go back one level up and create the mongodb directory:

cd ../ mkdir -p mongodb

9 Move the mongodb3.2.4 file from the/usr/local/tools directory to the/usr/local/mongodb directory:

mv tools/mongodb3.2.4/ mongodb/

10 Go to/usr/local/mongodb/mongodb3.2.4 directory:

cd mongodb/mongodb3.2.4

11 Create a log directory in/usr/local/mongodb/mongodb3.2.4/bin/:

mkdir -p data/test/logs

12 Create a directory for data files in/usr/local/mongodb/mongodb3.2.4/bin/directory:

mkdir -p data/test/db

13 Enter bin directory:

cd bin/

14 Create the configuration file mongodb.conf:

vi mongodb.conf

Write the following in mongodb.conf:

# idae - MongoDB config start - 2016-05-02#Set directory where data files are stored dbpath = /usr/local/mongodb/mongodb3.2.4/bin/data/test/db#Set directory where log files are stored and log file names logpath = /usr/local/mongodb/mongodb3.2.4/bin/data/test/logs/mongodb.log#Set port number port = 27017#Set to run as a daemon, i.e. in the background fork = true# nohttpinterface = truenohttpinterface = true#ids- MongoDB config end - 2016-05-02

press ":wq" in english to save and exit;

Parameter explanation:

--dbpath database path (data file)

--logpath Log file path

--master designated as master

--slave specified as slave machine

--source Specifies the IP address of the host

--pologSize specifies that the log file size does not exceed 64M. Because resync is very laborious and time-consuming, it is best to avoid resync by setting a sufficiently large oplog Size (the default oplog size is 5% of the free disk size).

--logappend Add at the end of the log file, i.e. write the log by appending

--journal Enable logging

--port Enable port number

--fork runs in the background

--only Specifies which database to copy only

--slavedelay refers to the time interval from replication detection

--auth Does authentication permission need to be logged in (username and password)

--syncdelay Time to write data to hard disk (seconds), 0 is no wait, write directly

--notablescan does not allow table scanning

--maxConns Maximum number of concurrent connections, default 2000

--pidfilepath specifies the process file, otherwise no process file is generated

--bind_ip Binds IP, after binding, only bound IP can access service

15 Start mongodb service:

15.1 Start with a custom mongodb profile:

./ mongod --config mongodb.conf

15.2 Start mongodb in repair mode:

./ mongod --repair -f mongodb.conf

15.3 Start parametrically:

./ mongod /usr/local/mongodb/mongodb3.2.4/bin/mongod --dbpath=/usr/local/mongodb/mongodb3.2.4/bin/data/test/db --logpath=/usr/local/mongodb/mongodb3.2.4/bin/data/test/logs/mongodb.log --fork

If the following error is reported:

ERROR: child process failed, exited with error number 1

It is likely that the path configured in mongodb.conf is inconsistent;

If the following error is reported:

ERROR: child process failed, exited with error number 100

It is likely that there is no normal shutdown, so you can delete the mongod.lock file.

15 View mongodb progress:

ps aux |grep mongodb

16 View the Mongodb service runtime log:

tail -200f /usr/local/mongodb/mongodb3.2.4/bin/data/test/logs/mongodb.log

17 Check whether the port is enabled:

netstat -lanp | grep 27017

18 Kill the mongodb process to shut down the mongodb service:

kill -15 PID

PID can be viewed via step 16

19 if the following occurs

warning: Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused

This can be done in two ways:

19.1 If the database cannot be connected as above, it may be a problem with the mongod.lock file under the data directory, which can be repaired by using the following command:

./ bin/mongod --repair

19.2 Or simply delete mongod.lock

rm -f /usr/local/mongodb/data/db/mongod.lock

Then start the mongodb service:

./ mongod --config mongodb.conf

If the above two parts still cannot be solved, it is the path file. We can delete the/usr/local/mongodb/mongodb3.2.4/bin/data directory and its subdirectories, and use the absolute path method:

./ mongod /usr/local/mongodb/mongodb3.2.4/bin/mongod --dbpath=/usr/local/mongodb/mongodb3.2.4/bin/data/test/db --logpath=/usr/local/mongodb/mongodb3.2.4/bin/data/test/logs/mongodb.log --fork

20 Add mongodb services to the startup file:

vi /etc/rc.local

Add the following command to the end of the file:

/usr/local/mongodb/mongodb3.2.4/bin/mongod --config mongodb.conf

Save and Exit:

:wq!

21 Client Common Commands:

db.version(); #Check the version of mongodb use test; #Enter the specified data, here is the test database

22 In/usr/local/mongodb/mongodb3.2.4/bin/directory, type the following command to open a mongodb client program, that is, open a mongodb shell client, this shell client is also a JavaScript editor, you can type any JavaScript script:

./ mongo

Default connection to test database

23 Enter IP:27017 in your browser, for example:

http://101.201.212.129:27017/

You can view MongoDB version information;

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