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About MongoDB

MongoDB, written in C++, is an open source database system based on distributed file storage.

In case of high load, adding more nodes can guarantee server performance.

MongoDB is designed to provide scalable, high-performance data storage solutions for WEB applications.

MongoDB installation and configuration

1. Install related software packages

[root@centos-01 ~]# wget -b http://downloads.mongodb.org/linux/mongodb-linux-x86_64-3.6.14.tgz

[root@centos-01 ~]# tar zxvf mongodb-linux-x86_64-3.6.14.tgz

[root@centos-01 ~]# mv mongodb-linux-x86_64-3.6.14 /ust/local/mongodb

2. Create MongoDB data storage directory and log storage directory

[root@centos-01 ~]# mkdir -p /data/mongodb/data

[root@centos-01 ~]# mkdir -p /data/logs/mongodb

[root@centos-01 ~]# ln -s /usr/local/mongodb/bin/* /usr/bin/

3. When MongoDB is frequently accessed, if the resource occupied by the shell startup process is set too low, an error will be generated, resulting in failure to connect to the MongoDB instance. Set ulimit -n and ulimit -u values greater than 20000.

[root@centos-01 ~]# ulimit -n 25000

[root@centos-01 ~]# ulimit -u 25000

4. Create MongoDB configuration file and define relevant parameters required for startup

[root@centos-01 ~]# vim /etc/mongodb.cnf#syslog systemLog: #log output destination, which can be specified as "file" or "syslog" destination: file #write log by appending logAppend: true #log storage directory path: /data/logs/mongodb/mongo.logstorage: #data storage directory dbPath: /data/mongodb/data #Whether to enable journal log persistent storage, journal log is used for data recovery, is the most basic feature of mongod, usually used for fault recovery journal: enabled: true# engine: wiredTiger# mmapv1:#The following configuration only works for wiredTiger engine (version 3.0 and above) wiredTiger: engineConfig: #wiredTiger Memory size of cached working set data cacheSizeGB: 4 #Whether to store index and collections data separately in dbPath directories directoryForIndexes: false collectionConfig: blockCompressor: zlib indexConfig: prefixCompression: false# how the process runsprocessManagement:#Run the process in the background fork: true #Complete path of PID File. If it is not set, there is no PID file. pidFilePath: /data/mongodb/mongod.pid # network interfaces net:#Default server port number port: 27017#mongodb IP address bindIp: 127.0.1security:#Indicates whether to enable user access control authorization: enabled#Performance analyzer operationProfiling: #Enable slowOpThresholdMs: 100 mode: slowOp#If the architecture mode is replication Set, the following configuration needs to be added to all "replication set"members: #replication:# oplogSizeMB: 2048 # replSetName: mongodb #sharding:## Enterprise-Only Options#auditLog:

5. Set kernel parameters and close NUMA

[root@centos-01 ~]# echo 0 >/proc/sys/vm/zone_reclaim_mode //When a node runs out of available memory, the system allocates memory from other nodes

[root@centos-01 ~]# sysctl -w vm.zone_reclaim_mode=0 //permanent setting

6. Mongodb starts and stops

[root@centos-01 ~]# mongod -f /etc/mongodb.cnf /Start

[root@centos-01 ~]# mongod -f /etc/mongodb.cnf --shutdown //stop

[root@centos-01 ~]# netstat -anpt | grep mongod

tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN 33475/mongod

7, set to boot automatically start

[root@centos-01 ~]# echo "mongod -f /etc/mongodb.cnf" >> /etc/rc.local

8. After entering MongoDB, you can also close mongoDB like this.

use admin;db.shutdownServer();

9. To facilitate the management of O & M personnel, write a MongoDB database control script.

[root@centos-01 ~]# vim /etc/init.d/mongod

#!/ bin/bash

PROG="/usr/local/mongodb/bin/mongod"

CONFIG=$1

CONF="/etc/$CONFIG.cnf"

case "$2" in

start)

$PROG -f $CONF

;;

stop)

$PROG -f $CONF --shutdown

;;

restart)

$0 stop

sleep 1

$0 start

sleep 1

echo "mongod has been restarted successfully"

;;

*)

echo "Usage: $0 {start|stop|restart}"

exit 2

esac

exit 0

[root@centos-01 ~]# chmod +x /etc/init.d/mongod

[root@centos-01 ~]# chkconfig --add mongod

[root@centos-01 ~]# /etc/init.d/mongod start

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