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sudo systemctl enable mongod
sudo systemctl daemon-reload

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[Service]
User=mongodb
Group=mongodb
EnvironmentFile=-/etc/default/mongod
ExecStart=/usr/bin/mongod --config /etc/mongod.conf
PIDFile=/var/run/mongodb/mongod.pid
# file size
LimitFSIZE=infinity
# cpu time
LimitCPU=infinity
# virtual memory size
LimitAS=infinity
# open files
LimitNOFILE=64000
# processes/threads
LimitNPROC=64000
# locked memory
LimitMEMLOCK=infinity
# total threads (user+kernel)
TasksMax=infinity
TasksAccounting=false

# Recommended limits for for mongod as specified in
# http://docs.mongodb.org/manual/reference/ulimit/#recommended-settings

[Install]
WantedBy=multi-user.target
 

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sudo vim /etc/mongod.conf

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use admin
db.createUser({
    user: "admin",
    pwd: "admin",
    roles: [
        {
            role: "dbAdminAnyDatabase",
            db: "admin"
        }
    ]
})

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security:
    authorization: enabled

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mongo --port 27017 -u admin -p admin --authenticationDatabase admin

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cd
mongodump -u admin -p admin -d test -o data # -d制定要匯出的資料庫名稱
#......匯出當前的所有庫
cd /var/lib/mongodb
sudo rm ./* -r
sudo service mongod start
cd
mongorestore -u admin -p admin --dir data