Upgrading from MongoDB 4.0 Community Edition

Upgrading from MongoDB 4.0 Community Edition

Note

MongoDB creates a user that belongs to two groups, which is a potential security risk. This is fixed in Percona Server for MongoDB: user is included only in the mongod group. To avoid problems with current MongoDB setups, existing user group membership is not changed when you migrate to Percona Server for MongoDB. Instead, a new mongod user is created during installation, and it belongs to the mongod group.

An in-place upgrade is done with existing data in the server. Generally speaking, this is stopping the server, removing the old packages, installing the new server and starting it with the same data files. While an in-place upgrade may not be suitable for high-complexity environments, it should work in most cases.

Warning

Before starting the upgrade process it is recommended to perform a full backup of your data.

The upgrade process depends on the distribution you are using:

Upgrading on Debian or Ubuntu

Run the following commands as root or by using the sudo command

Important

Before you start the upgrading, update the MongoDB configuration file (/etc/mongod.conf) to contain the following settings. Otherwise the mongod service will not be able to start.

processManagement:
   fork: true
   pidFilePath: /var/run/mongod.pid

  1. Stop the mongod process: service mongod stop

  2. Check for installed packages: dpkg -l | grep mongod

    Output

    ii  mongodb-org            4.0.4    amd64      MongoDB open source document-oriented database system (metapackage)
ii  mongodb-org-mongos     4.0.4    amd64      MongoDB sharded cluster query router
ii  mongodb-org-server     4.0.4    amd64      MongoDB database server
ii  mongodb-org-shell      4.0.4    amd64      MongoDB shell client
ii  mongodb-org-tools      4.0.4    amd64      MongoDB tools

  3. Remove the installed packages:

    $ apt-get remove mongodb-org mongodb-org-mongos mongodb-org-server \
$ mongodb-org-shell mongodb-org-tools

  4. Install Percona Server for MongoDB using apt.

Upgrading on Red Hat Enterprise Linux or CentOS

Run the following commands as root or by using the sudo command

Important

Before you start the upgrading, update the MongoDB configuration file (/etc/mongod.conf) to contain the following settings. Otherwise the mongod service will not be able to start.

processManagement:
   fork: true
   pidFilePath: /var/run/mongod.pid

  1. Stop the mongod process: service mongod stop

  2. Check for installed packages: rpm -qa | grep mongo

    Output

    mongodb-org-mongos-4.0.4-1.el6.x86_64
mongodb-org-shell-4.0.4-1.el6.x86_64
mongodb-org-server-4.0.4-1.el6.x86_64
mongodb-org-tools-4.0.4-1.el6.x86_64
mongodb-org-4.0.4-1.el6.x86_64

  1. Remove the installed packages:

    $ yum remove \
mongodb-org-mongos-4.0.4-1.el6.x86_64 \
mongodb-org-shell-4.0.4-1.el6.x86_64 \
mongodb-org-server-4.0.4-1.el6.x86_64 \
mongodb-org-tools-4.0.4-1.el6.x86_64 \
mongodb-org-4.0.4-1.el6.x86_64

  2. Install Percona Server for MongoDB using yum.

Note

When you remove old packages, your existing configuration file is saved as /etc/mongod.conf.rpmsave. If you want to use this configuration with the new version, replace the default /etc/mongod.conf file. For example, existing data may not be compatible with the default WiredTiger storage engine.

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