MongoDB Install

MongoDB install Docs

Ubuntu

• install Docs

• add key

sudo wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -

• Create a list file for MongoDB '/etc/apt/sources.list.d/mongodb-org-4.4.list'

//if ubuntu 20.04

echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list

//if ubuntu 18.04

echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list

• Reload local package database

sudo apt-get update

• Install the MongoDB packages

sudo apt-get install -y mongodb-org

• To prevent unintended upgrades, you can pin the package at the currently installed version

echo "mongodb-org hold" | sudo dpkg --set-selections

echo "mongodb-org-server hold" | sudo dpkg --set-selections

echo "mongodb-org-shell hold" | sudo dpkg --set-selections

echo "mongodb-org-mongos hold" | sudo dpkg --set-selections

echo "mongodb-org-tools hold" | sudo dpkg --set-selections

Redhat/ centos

-install Docs

Configure Package Management System

Create a /etc/yum.repos.d/mongodb-org-4.0.repo file with following content so that you can install MongoDB directly using yum

[mongodb-org-4.0]

name=MongoDB Repository

baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.0/x86_64/

gpgcheck=1

enabled=1

gpgkey=https://www.mongodb.org/static/pgp/server-4.0.asc

Install the MongoDB packages

To install the latest stable version of MongoDB, issue the following command:

sudo yum install -y mongodb-org

Note : mongodb-org is a meta package

Exclude MongoDB packages

(from auto update)

You can specify any available version of MongoDB. However yum upgrades the packages when a newer version becomes available.

To prevent unintended upgrades, pin the package. To pin a package, add the following exclude directive to your /etc/yum.conf file:

exclude=mongodb-org,

mongodb-org-server,

mongodb-org-shell,

mongodb-org-mongos,mongodb-org-tools

mongod --version

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Settings

Increase user limit settings

Docs

To increase processes limit

(for mongod server)

• Go to following folder

  cd /etc/security/limits.d

• Create following new file

  cat > 99-mongodb-nproc.conf

• Add following content (soft is like >= lower limit, hard is upper limit)

  mongod soft nofile 64000

  mongod hard nofile 64000

  mongod soft nproc 64000

  mongod hard nproc 64000

  Note : these limits.d settings will override ulimit settings

• For example in limits.d, there is one more file 20-nproc.conf (which set process limit for user accounts), so similar syntax for mongod also

  * soft nproc 4096

  root soft nproc unlimited

To increase user resources limit

To check per-user limitations for various resources

ulimit -a

output

core file size (blocks, -c) 0

data seg size (kbytes, -d) unlimited

scheduling priority (-e) 0

file size (blocks, -f) unlimited

pending signals (-i) 30896

max locked memory (kbytes, -l) 64

max memory size (kbytes, -m) unlimited

open files (-n) 1024

pipe size (512 bytes, -p) 8

POSIX message queues (bytes, -q) 819200

real-time priority (-r) 0

stack size (kbytes, -s) 8192

cpu time (seconds, -t) unlimited

max user processes (-u) 30896

virtual memory (kbytes, -v) unlimited

file locks (-x) unlimited

To modify paticular user limit settings (say open files)

ulimit -n <value>

• Run following for recommended ulimit Settings

  #file size

  ulimit -f unlimited

  #cpu time

  ulimit -t unlimited

  #virtual memory

  ulimit -v unlimited

  #locked-in-memory size

  ulimit -l unlimited

  #memory size

  ulimit -m unlimited

  #open files

  ulimit -n 64000

  #processes/threads

  ulimit -u 64000

Always remember to restart your mongod and mongos instances after changing the ulimit settings to ensure that the changes take effect.

To change Default Directories

By default

/var/lib/mongo (the data directory)

/var/log/mongodb/mongod.log (the log directory)

• Edit the the configuration file /etc/mongod.conf

  storage.dbPath=/some/data/directory

  systemLog.path=/some/log/directory/mongod.log

Config file options Docs

Note: (mongod user is created by MONGO DB installation, this user must have access to the path defined by you for storage)

• configured db path folder must exist
• also configure port & ip address

Start/ stop MongoDB

sudo service mongod start

Verify that MongoDB has started successfully

check (configured) log file

/var/log/mongodb/mongod.log

Optionally ensure that MongoDB will start following a system reboot by issuing the following command:

sudo chkconfig mongod on //it internally does 'systemctl enable mongod.service'

Stop MongoDB

sudo service mongod stop

Restart MongoDB

sudo service mongod restart