Install multiple versions of MongoDB on linux - linux

Question

How can we setup multiple versions of MongoDB on Ubuntu 16.04?
MongoDB 3.4.1 is already up and running on my system and wanted to setup MongoDB 2.6 for other application. Because our Application running on MongoDB 2.6 is having DB driver which is not compatible with MongoDB 3.4 hence wanted run both MongoDB version on same linux server.
Tried to follow below link but couldn't succeed.
How can I install two versions of mongodb parallely in Ubuntu 12.04
?
multiple versions of Mongo
multiple instances of Mongo DB on same server

Answer 1

To do that, you must have both versions of MongoDB available on your system.
For instance, let's say you have downloaded the 2.6 version binaries to /opt/mongo/26/ and the other version's at /opt/mongo/34/, you could run both versions of the database daemon on different ports:
/opt/mongo/26/mongod --dbpath /data/26/ --port 27017
/opt/mongo/34/mongod --dbpath /data/34/ --port 28018

Answer 2

This is what I do.
1. Choose version:
Community: https://www.mongodb.com/download-center/community/releases/archive
Enterprise: https://www.mongodb.com/download-center/enterprise/releases/archive
2. Install and Configuration
I use Ubuntu 20.04 and I want to install mongodb Community ver 2.6.12
Installing:
$ cd ~/Downloads
$ curl -O http://downloads.mongodb.org/linux/mongodb-linux-x86_64-2.6.12.tgz
$ tar -zxvf mongodb-linux-x86_64-2.6.12.tgz
$ mv mongodb-linux-x86_64-2.6.12 2.6.12
$ cd /opt && mkdir -p mongodb
$ cd ~/Downloads
$ cp -R 2.6.12 /opt/mongodb
$ cp /mongod.conf /opt/mongodb/2.6.12/
Configuration:
Configuration options on version <3.0 is different with version >3.0 so I googled it. This is what I had.
systemLog:
destination: file
path: "/var/log/mongodb/mongodb.log"
logAppend: true
storage:
journal:
enabled: true
processManagement:
fork: true
net:
bindIp: 127.0.0.1
port: 27018
setParameter:
enableLocalhostAuthBypass: false
On this file, you need change systemLog.path, net.port and net.bindIp to your own. One important thing is we cannot run 2 versions at same time with same port. So here I set 27018 for older version.
Put it wherever you want, I did:
$ cp ~/mongod.conf /opt/mongodb/2.6.12/
DON'T RUN THIS because it will overwrite current mongodb version commands
$ export PATH=/opt/mongodb/2.6.12/bin:$PATH
Create data and log directories and set permission.
$ mkdir -p /data/db
$ mkdir -p /var/log/mongodb
Running:
Now you can start 2.6 version with command.
$ /opt/mongodb/2.6.12/bin/mongod --fork --dbpath /data/db --config /opt/mongodb/2.6.12/mongod.conf
It is too long, isn't it? So make it shorter with alias.
$ sudo nano ~/.bash_profile
or
$ sudo nano ~/.bashrc
and add this to file
alias mongo26="/opt/mongodb/2.6.12/bin/mongo --port 27018"
alias mongoRestore26="/opt/mongodb/2.6.12/bin/mongorestore --port 27018"
alias mongoDump26="/opt/mongodb/2.6.12/bin/mongodump --port 27018"
alias startMongo26="/opt/mongodb/2.6.12/bin/mongod --fork --dbpath /data/db --config /opt/mongodb/2.6.12/mongod.conf"
alias stopMongo26="/opt/mongodb/2.6.12/bin/mongod --dbpath /data/db --shutdown"
alias nanoMongo="nano /opt/mongodb/2.6.12/mongod.conf"
alias tailMongo="tail -f /var/log/mongodb/mongod.log"
alias tailMongo26="tail -f /var/log/mongodb/mongodb.log"
Apply these alias
$ source ~/.bash_profile
or
$ source ~/.bashrc
Now we can simply start mongodb version 2.6 by
$ startMongo26
about to fork child process, waiting until server is ready for connections.
forked process: 1049481
child process started successfully, parent exiting
Run shell version 2.6
$ mongo26
MongoDB shell version: 2.6.12
connecting to: 127.0.0.1:27018/test
>
Run shell current version
$ mongo
MongoDB shell version v4.4.3
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("3ae6094f-86dc-4741-aa72-1e48efc5273a") }
MongoDB server version: 4.4.3
>
3.Troubleshooting
Cannot start by startMongo26 please check log at /var/log/mongodb/mongod.log
about to fork child process, waiting until server is ready for connections.
forked process: 1049890
ERROR: child process failed, exited with error number 100
Check log at /var/log/mongodb/mongod.log
If log has this line:
2021-02-26T15:51:13.493-0700 [initandlisten] exception in initAndListen: 10309 Unable to create/open lock file: /data/db/mongod.lock errno:13 Permission denied Is a mongod instance already running?, terminating
This is because your current user doesn't have permission to run and write into this directory. You can set permission to /data/db or change directory. I changed to ~/datamongo
$ /opt/mongodb/2.6.12/bin/mongod --fork --dbpath ~/datamongo --config /opt/mongodb/2.6.12/mongod.conf
Do the same with error on /var/log/mongodb/mongodb.log
Cannot shutdown by stopMongo26
There doesn't seem to be a server running with dbpath: /data/db
Do this:
$ mongo26
MongoDB shell version: 2.6.12
connecting to: 127.0.0.1:27018/test
> use admin
switched to db admin
> db.shutdownServer()
2021-02-26T15:45:19.738-0700 DBClientCursor::init call() failed
server should be down...
2021-02-26T15:45:19.742-0700 trying reconnect to 127.0.0.1:27018 (127.0.0.1) failed
2021-02-26T15:45:19.742-0700 warning: Failed to connect to 127.0.0.1:27018, reason: errno:111 Connection refused
2021-02-26T15:45:19.742-0700 reconnect 127.0.0.1:27018 (127.0.0.1) failed failed couldn't connect to server 127.0.0.1:27018 (127.0.0.1), connection attempt failed
Do step by step with my instruction you gonna be ok. Good luck and enjoy!!!