Ubuntu18.04_MongoDB Replica 구성

• config 파일 위치 : /home/mongo/mongodb_pri.conf. /home/mongo/mongodb_repl1.conf /home/mongo/mongodb_repl2.conf
• data 파일 위치 : /home/mongo/data/pri /home/mongo/data/repl1 /home/mongo/data/repl2
• /home/mongo/log/pri /home/mongo/log/repl1 /home/mongo/log/repl2

 

같은 서버에서 test했기 때문에 디렉토리의 명칭이 모두 달라야 합니다.

다른 서버에서 test하는 경우 디렉토리를 한 개만 만들면 됩니다.

---

MongoDB 유저 생성

• mongo 유저 및 mongod 그룹을 생성한다.

[root] adduser mongo
-> mongo
-> 1
-> 
->
->
-> y

[root] groupadd mongod
[root] usermod -a -G mongod mongo

 

• 필요 디렉토리를 생성해준다.

#필요 디렉토리도 같이 생성해준다
[root@/home/mongo] mkdir -p engine data/pri data/repl1 data/repl2 log/pri log/repl1 log/repl2

#권한을 바꿔준다
[root@/home] chown -R mongo:mongod engine data log

 

MongoDB 설치

• mongo db tar 파일을 가져온다.

[root] su - mongo

[mongo] wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1804-4.4.5.tgz
[mongo] tar -xvzf mongodb-linux-x86_64-ubuntu1804-4.4.5.tgz
[mongo] mv mongodb-linux-x86_64-ubuntu1804-4.4.5 mongodb

 

• bin 파일을 원하는 디렉토리로 옮겨준다.

[mongo@mongodb] mv bin /home/mongo/engine 

 

• 환경변수를 추가한다.

[mongo@~] vi .bash_profile 
if [ -f ~/.bashrc ]; then
    . ~/.bashrc
fi

if [ -f ~/.profile ]; then
    . ~/.profile
fi

##LOCAL PATH
PATH=$PATH:$HOME/.local/bin:$HOME/bin
export PATH

##MONGO PATH
MONGODB_HOME=/home/mongo
 
PATH=$PATH:$MONGODB_HOME/engine/bin
 
export MONGODB_HOME
export PATH

#적용
[mongo] . ~/.bash_profile 

#mongo 버전을 확인하여 환경변수 설정에 이상이 없는지 확인한다. 
[mongo] mongo -version
#정상
MongoDB shell version v4.4.5
Build Info: {
    "version": "4.4.5",
    "gitVersion": "ff5cb77101b052fa02da43b8538093486cf9b3f7",
    "openSSLVersion": "OpenSSL 1.1.1  11 Sep 2018",
    "modules": [],
    "allocator": "tcmalloc",
    "environment": {
        "distmod": "ubuntu1804",
        "distarch": "x86_64",
        "target_arch": "x86_64"
    }
}

> mongo: error while loading shared libraries: libcurl.so.4: cannot open shared object file 에러

원인 : 최신 커뮤니티 패키지를 설치하지 않았기 때문이다.
해결 : 패키지를 설치해준다. (libcurl4에 libcurl.so.4가 포함되어 있음)

#root에서 진행
[root] apt-get install curl libcurl4

 

• mongo db 구성 파일 생성

#primary
[mongo] vi mongodb_pri.cnf
# mongod.conf

# for documentation of all options, see:
#   http://docs.mongodb.org/manual/reference/configuration-options/

# where to write logging data.
systemLog:
  destination: file
  logAppend: true
  path: /home/mongo/log/pri/mongodb.log

# Where and how to store data.
storage:
  dbPath: /home/mongo/data/pri
  journal:
    enabled: true
#  engine:
#  wiredTiger:

# how the process runs
processManagement:
  fork: true  # fork and run in background
  pidFilePath: /home/mongo/data/pri/mongod.pid  # location of pidfile
  timeZoneInfo: /usr/share/zoneinfo

# network interfaces
net:
  port: 27017 
  bindIp: 0.0.0.0

#security:

#operationProfiling:

replication:
  replSetName: "replSet1" 

#sharding:

## Enterprise-Only Options

#auditLog:

#snmp:

------------------------------------------------------------------------------
#standby
[mongo] vi mongodb_repl1.cnf
# mongod.conf

# for documentation of all options, see:
#   http://docs.mongodb.org/manual/reference/configuration-options/

# where to write logging data.
systemLog:
  destination: file
  logAppend: true
  path: /home/mongo/log/repl1/mongodb1.log

# Where and how to store data.
storage:
  dbPath: /home/mongo/data/repl1
  journal:
    enabled: true
#  engine:
#  wiredTiger:

# how the process runs
processManagement:
  fork: true  # fork and run in background
  pidFilePath: /home/mongo/data/repl1/mongod.pid  # location of pidfile
  timeZoneInfo: /usr/share/zoneinfo

# network interfaces
net:
  port: 27018 
  bindIp: 0.0.0.0

#security:

#operationProfiling:

replication:
  replSetName: "replSet1" 

#sharding:

## Enterprise-Only Options

#auditLog:

#snmp:

------------------------------------------------------------------------------
#arbitor
[mongo] vi mongodb_repl2.cnf
# mongod.conf

# for documentation of all options, see:
#   http://docs.mongodb.org/manual/reference/configuration-options/

# where to write logging data.
systemLog:
  destination: file
  logAppend: true
  path: /home/mongo/log/repl2/mongodb2.log

# Where and how to store data.
storage:
  dbPath: /home/mongo/data/repl2
  journal:
    enabled: true
#  engine:
#  wiredTiger:

# how the process runs
processManagement:
  fork: true  # fork and run in background
  pidFilePath: /home/mongo/data/repl2/mongod.pid  # location of pidfile
  timeZoneInfo: /usr/share/zoneinfo

# network interfaces
net:
  port: 27019
  bindIp: 0.0.0.0

#security:

#operationProfiling:

replication:
  replSetName: "replSet1" 

#sharding:

## Enterprise-Only Options

#auditLog:

#snmp:

 

• 각 cnf 파일에서 설정한 포트 접속을 허용한다. 

#root에서 진행
[root] ufw allow 27017/tcp
[root] ufw allow 27018/tcp
[root] ufw allow 27019/tcp

 

• 실행한다. (한번에 기동하기 위해 start.sh 파일에 실행 명령어를 추가)

#파일 생성
[mongo] vi start.sh
mongod -config /home/mongo/mongodb_pri.cnf
mongod -config /home/mongo/mongodb_repl1.cnf
mongod -config /home/mongo/mongodb_repl2.cnf

#실행권한 부여
[mongo] chmod +x start.sh
[mongo] . start.sh
about to fork child process, waiting until server is ready for connections.
forked process: 8945
child process started successfully, parent exiting
about to fork child process, waiting until server is ready for connections.
forked process: 8981
child process started successfully, parent exiting
about to fork child process, waiting until server is ready for connections.
forked process: 9017
child process started successfully, parent exiting

#db 실행
[mongo] mongo

> ERROR: child process failed, exited with 48 에러
원인 : 이미 기동이 되어 SID를 사용중이기 때문에 같은 ID를 사용할 수 없다는 의미
해결 : 죽이고 다시 시작해준다

#root에서 죽이기
[root] kill -9 [SID] [SID] [SID]

 

Replica 구성

• 몽고에 접속하여 replica를 구성한다. 

>rs.initiate(
            {
       _id: "replSet1",
       version: 1,
       members: [
          { _id: 0, host : "172.40.40.33:27017" },
          { _id: 1, host : "172.40.40.33:27018" },
          { _id: 2, host : "172.40.40.33:27019" }
] }
)

#결과
{
	"ok" : 1,
	"$clusterTime" : {
		"clusterTime" : Timestamp(1620375642, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	},
	"operationTime" : Timestamp(1620375642, 1)
}

 

• 재접속한다.

[mongo] mongo -port 27017 #primary 접속
> use admin
> db.createUser(
   {
     user: 'admin',
     pwd: 'mongo',
     roles: ['root']
} )

#결과
Successfully added user: { "user" : "admin", "roles" : [ "root" ] }

[mongo] mongo -u admin -p mongo -port 27018 #secondary 접속
SECONDARY> rs.secondaryOk() 
SECONDARY> use test
SECONDARY> db.testcol.find()

#결과
{ "_id" : ObjectId("6094fa47016f4b5945f35d20"), "seq" : 1 }