mongodb installation, basic operation

A, mongodb installation

1, environment preparation

System version  CentOS 6.9 

Software version  mongondb-4.0.1

2, installation mongondb

# cd /usr/local/src

Wget # https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel62-4.0.1.tgz     download

# tar zxvf mongodb-linux-x86_64-rhel62-4.0.1.tgz -C /usr/local/

# cd /usr/local/

# ln -s mongodb-linux-x86_64-rhel62-4.0.1 mongodb  

# Mkdir -p / usr / local / dbdata / mongodb create a data storage directory

(# Mkdir -p / usr / local / dbdata / mongodb / {mongodb27017, mongodb27018}) for the two examples of preparation

# Mkdir -p / usr / local / dbconf / mongodb create profile directory

# Mkdir -p / usr / local / dblog / mongodb create a log file directory

# Vim /usr/local/dbconf/mongodb/mongodb27017.conf initiative to create a configuration file ( the installation package templates did not )

port = 27017 # default server port number dbpath = / usr / local / dbdata / mongodb / mongodb27017 # data storage directory logpath = / usr / local / dblog / mongodb / mongodb27017.log # log file logappend = true # Use additional way to write the log fork = true # running in the background maxConns = 5000

# / Usr / local / mongodb /    bin / mongod -f /usr/local/dbconf/mongodb/mongodb27017.conf start example

# / Usr / local / mongodb / bin / mongod -f /usr/local/dbconf/mongodb/mongodb27017.conf --shutdown stop the instance

# / Usr / local / mongodb / bin / mongo --host 127.0.0.1:27017 connection instance

 

Second, the basic operation

Basic Operation

show dbs; # All database 

show collections; # Display Set current database (similar to the relational database tables) 

Show Users; # Check current user information database 

use  < DB name > ; # switching database with mysql as 

DB; or db.getName (); # View current database 

db.help (); # display database operations command, there are a lot of command 
db.foo.help (); # display set operations command, also has a lot of command, foo refers to the database is a collection called foo present, not in the true sense command 
db.foo.find (); # data for the current database foo set of lookup (because there is no condition, will list all of the data) 
db. foo.find ({a: 1 }); # lookup database foo the current set of data that has a property called a, and a value of 1

Create a test database example:

>  Use test; # create the database, if the test inventory is cut into test library, it does not exist is to create a test database, but behind the need to create a table like immediately, otherwise it will be automatically cleans 
Switched to db test
 > db;                
test 
> Show dbs; # check database 
ADMIN 0 .000GB 
local 0 .000GB 

> db.test. INSERT ({ "the _id": " 520. ", "name": "Xiaoming"}) # Create a table 

WriteResult ({ "nInserted": . 1 } ) 

> db.createUser ({ User : "Xiaoming", pwd: " 123456 ", Roles: [ {Role: "useradmin", DB: "Test"} ] }) # Create a user
Added Successfully User : { 
" User ": "Xiaoming", 
"Roles": [ 
{ 
"Role": "useradmin", 
"DB": "Test" 
} 
] 
} 
db.removeUser ( "the userName"); # delete user 
show users; # display all current users

db.dropDatabase (); # delete the current use of the database

 

> show dbs;
admin 0.000GB
local 0.000GB
test 0.000GB
test_1 0.000GB

> db;
test_1

> db.dropDatabase();
{ "dropped" : "test_1", "ok" : 1 }


> show dbs;
admin 0.000GB
local 0.000GB
test 0.000GB

 

db.stats (); # shows the current db state

 

> db.stats();
{
    "db" : "test_1",
    "collections" : 0,
    "views" : 0,
    "objects" : 0,
    "avgObjSize" : 0,
    "dataSize" : 0,
    "storageSize" : 0,
    "numExtents" : 0,
    "indexes" : 0,
    "indexSize" : 0,
    "fileSize" : 0,
    "ok" : 1
}

 

db.version (); # current db version

> db.version();
3.4.10

db.getMongo (); # to view the current db link address of the machine

> db.getMongo();
connection to 172.16.40.205:27017

Open Remote Access

 

Edit the configuration file: vi / etc / mongod.conf 
bindIp: 172.16 . 40.205       # IP address of the server where the database 
stored resume database! 
> . / Mongo 172.16 . 40.205 : 27017 / ADMIN   - U the User   - the p-password