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MongoDB is a database based on distributed file storage. Written in C++ language. Designed to provide scalable high-performance data storage solutions for WEB applications. It is widely used because of its high performance, easy to deploy, easy to use, convenient data storage and so on. Its installation and configuration is quite simple, like a lightweight mysql, but the functionality is exactly the same. This article mainly describes the start and stop of mongoDB.

First, prepare the environment

1. Current environment

# more / etc/redhat-release

CentOS release 6.7 (Final)

2. Install mongod

# which mongod

/ var/lib/mongodb/bin/mongod

Reference:

Quick installation of MongoDB under Linux

Install MongoDB on Windows platform

3. Create a data directory

# mkdir-pv / data/mongodata/ {rs1,rs2,rs3}

# mkdir-pv / var/lib/mongodb/conf

2. Start mongodb

1. Start mongodb based on the command line

# mongod-dbpath=/data/mongodata/rs1-logpath=/data/mongodata/rs1/rs1.log &

The default port is

[root@node3 rs1] # netstat-nltp | grep mongod

Tcp 0 0 0.0.0 0 27017 0.0.0 0 15 * LISTEN 5062/mongod

2. Command line startup based on configuration file

Vi / var/lib/mongodb/conf/rs2.conf

Port = 27000

Dbpath = / data/mongodata/rs2

Logpath = / data/mongodata/rs2/rs2.log

Smallfiles = true

Fork = true

Pidfilepath = / var/run/mongo.pid

# mongod-- config / var/lib/mongodb/conf/rs2.conf &

# Author: Leshami

# Blog: http://blog.csdn.net/leshami

# netstat-nltp | grep 27000

Tcp 00 0.0.0.0 27000 0.0.0.015 * LISTEN 5356/mongod

3. Start mongodb in daemon mode

# mongod-dbpath=/data/mongodata/rs3-logpath=/data/mongodata/rs1/rs3.log-fork-port 28000

# netstat-nltp | grep mongod

Tcp 00 0.0.0.0 28000 0.0.0.015 * LISTEN 5465/mongod

Tcp 0 0 0.0.0 0 27017 0.0.0 0 15 * LISTEN 5435/mongod

Tcp 00 0.0.0.0 27000 0.0.0.015 * LISTEN 5448/mongod

4. Start mogodb by using system services

Startup script

# vi / etc/init.d/mongod

#! / bin/sh

# chkconfig: 2345 93 18

# MogoDB home directory

MONGODB_HOME=/var/lib/mongodb

# mongodb command

MONGODB_BIN=$MONGODB_HOME/bin/mongod

# mongodb config file

MONGODB_CONF=$MONGODB_HOME/conf/mongodb.conf

# mongodb PID

MONGODB_PID=/var/run/mongo.pid

# set open file limit

SYSTEM_MAXFD=65535

MONGODB_NAME= "mongodb"

. / etc/rc.d/init.d/functions

If [!-f $MONGODB_BIN]

Then

Echo "$MONGODB_NAME startup: $MONGODB_BIN not exists!"

Exit

Fi

Start () {

Ulimit-HSn $SYSTEM_MAXFD

$MONGODB_BIN-config= "$MONGODB_CONF"-fork # # added @ 20160901

Ret=$?

If [$ret-eq 0]; then

Action $"Starting $MONGODB_NAME:" / bin/true

Else

Action $"Starting $MONGODB_NAME:" / bin/false

Fi

}

Stop () {

PID=$ (ps aux | grep "$MONGODB_NAME" | grep "$MONGODB_CONF" | grep-v grep | wc-l)

If [$PID-eq 0]; then

Action $"Stopping $MONGODB_NAME:" / bin/false

Exit

Fi

Kill-HUP `cat $MONGODB_ PID`

Ret=$?

If [$ret-eq 0]; then

Action $"Stopping $MONGODB_NAME:" / bin/true

Rm-f $MONGODB_PID

Else

Action $"Stopping $MONGODB_NAME:" / bin/false

Fi

}

Restart () {

Stop

Sleep 2

Start

}

Case "$1" in

Start)

Start

Stop)

Stop

Status)

Status $prog

Restart)

Restart

*)

Echo $"Usage: $0 {start | stop | status | restart}"

Esac

# chmod uplix / etc/init.d/mongod

# service mongod start

About to fork child process, waiting until server is ready for connections.

Forked process: 5543

Child process started successfully, parent exiting

Starting mongodb: [OK]

3. Stop mongoDB

1. Send signals to the mongod process

# SIGINT signal

# ps-ef | grep mongod | grep rs1

Root 5435 4914 1 19:13 pts/2 00:00:14 mongod-dbpath=/data/mongodata/rs1-logpath=/data/mongodata/rs1/rs1.log

# kill-2 5435

2016-08-30T17:02:00.528+0800 I CONTROL [signalProcessingThread] got signal 2 (Interrupt), will terminate after current cmd ends

2016-08-30T17:02:00.530+0800 I REPL [signalProcessingThread] Stopping replication applier threads

2016-08-30T17:02:00.554+0800 I STORAGE [conn1253] got request after shutdown ()

2016-08-30T17:02:00.774+0800 I CONTROL [signalProcessingThread] now exiting

2016-08-30T17:02:00.774+0800 I NETWORK [signalProcessingThread] shutdown: going to close listening sockets...

2016-08-30T17:02:00.774+0800 I NETWORK [signalProcessingThread] closing listening socket: 6

2016-08-30T17:02:00.775+0800 I NETWORK [signalProcessingThread] closing listening socket: 7

2016-08-30T17:02:00.775+0800 I NETWORK [signalProcessingThread] removing socket file: / tmp/mongodb-27017.sock

2016-08-30T17:02:00.775+0800 I NETWORK [signalProcessingThread] shutdown: going to flush diaglog...

2016-08-30T17:02:00.775+0800 I NETWORK [signalProcessingThread] shutdown: going to close sockets...

2016-08-30T17:02:00.775+0800 I STORAGE [signalProcessingThread] shutdown: waiting for fs preallocator...

2016-08-30T17:02:00.775+0800 I STORAGE [signalProcessingThread] shutdown: final commit...

2016-08-30T17:02:00.775+0800 I JOURNAL [signalProcessingThread] journalCleanup...

2016-08-30T17:02:00.775+0800 I JOURNAL [signalProcessingThread] removeJournalFiles

2016-08-30T17:02:00.777+0800 I NETWORK [conn1254] end connection 192.168.1.247 30T17:02:00.777+0800 58349 (0 connections now open)

2016-08-30T17:02:00.779+0800 I JOURNAL [signalProcessingThread] Terminating durability thread...

2016-08-30T17:02:00.881+0800 I JOURNAL [journal writer] Journal writer thread stopped

2016-08-30T17:02:00.882+0800 I JOURNAL [durability] Durability thread stopped

2016-08-30T17:02:00.882+0800 I STORAGE [signalProcessingThread] shutdown: closing all files...

2016-08-30T17:02:00.884+0800 I STORAGE [signalProcessingThread] closeAllFiles () finished

2016-08-30T17:02:00.884+0800 I STORAGE [signalProcessingThread] shutdown: removing fs lock...

2016-08-30T17:02:00.885+0800 I CONTROL [signalProcessingThread] dbexit: rc: 0

# SIGTERM signal

# ps-ef | grep mongod | grep rs3

# ps-ef | grep mongod | grep rs3

Root 5465 1 1 19:14? 00:00:13 mongod-dbpath=/data/mongodata/rs3-logpath=/data/mongodata/rs1/rs3.log-fork-port 28000

# kill-4 5465

Signal generation mode

Sigint will send this signal to the current process through ctrl+c

The sigterm kill command sends this signal with no arguments.

Impact on the process

The sigint signal is received by the current process tree, that is, not only the current process will receive the signal, but also its child processes

Sigterm only the current process receives the signal, and the child process does not receive it. If the current process is kill, the parent of its child process will be init, that is, the process with pid 1

After the above signal is sent,

New connection requests are no longer accepted

Wait for the existing connection to be processed

Close all open connections

Write out the data in memory to disk

Safe stop

2. Stop mongod by using system service script

# ps-ef | grep mongod

Root 5675 1 3 19:33? 00:00:00 / var/lib/mongodb/bin/mongod-- config=/var/lib/mongodb/conf/rs2.conf

Root 5689 4950 0 19:33 pts/3 00:00:00 grep mongod

[root@node3 conf] #

[root@node3 conf] # service mongod stop

Stopping mongodb: [OK]

3. Db.shutdownServer () mode

# mongo localhost:27000

> use admin

> db.shutdownServer ()

4. Use command-line shutdown (supplement @ 20160901)

# mongod-f / etc/mongo-m.conf-- shutdown

5. Force the shutdown of mongod

# kill-9 5675

Disadvantages:

Database shuts down directly

Data loss

The data file is easily damaged (needs to be repaired)

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