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mongodb-upgrade-from-3.6-to-4.2-centos.md

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MongoDB UPGRADE

Upgrade Recommendations :

To upgrade MongoDB from 3.6 to 4.2 , you must be running 4.0 release, so we are obliged to upgrade to 4.0 version then we can upgrade successfully our MongoDB to 4.2 version.

Upgrade to MongoDB 4.0 :

We can follow this steps to upgrade our MongoDB to 4.0 version:

  • systemctl stop mongod

  • To upgrade to 4.0 we need to have this lines in mongodb-org.repo:

  • vi /etc/yum.repos.d/mongodb-org.repo

[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
  • yum update : to update and download the mongod 4.0 packages

The 4.0 instance must have featureCompatibilityVersion set to 4.0, so to check featureCompatibilityVersion run the following commands:

  • mongo
  • db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } )

The operation should return a result that includes "featureCompatibilityVersion": "4.0".

If not we can set it or update the featureCompatibilityVersion by running:

  • db.adminCommand( { setFeatureCompatibilityVersion: "4.0" } )

Here is the result what we should have: { "ok" : 1 }

Then exit

The next step will be the upgrade to 4.2 version.

Upgrade to MongoDB 4.2 :

We can follow this steps to upgrade our MongoDB to 4.2:

  • systemctl stop mongod

  • In mongodb-org.repo we need to have:

    • vi /etc/yum.repos.d/mongodb-org.repo
[MongoDB]
name=MongoDB Repository
baseurl=http://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.2/$basearch/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.2.asc

  • yum update to download mongod 4.2 packages

  • systemctl restart mongod

  • At this point, you can run the 4.2 binaries without the 4.2 features that are incompatible with 4.0, to enable these 4.2 features you should run:

db.adminCommand( { setFeatureCompatibilityVersion: "4.2" } )

Helpful documentation :

https://docs.mongodb.com/manual/reference/command/setFeatureCompatibilityVersion/