Illegal instruction (core dumped) mongodb Ubuntu 20.04 LTS

Question

I installed mongodb-org 5.0.2 as per official documentation

Codes i used to install via Terminal given below:

     1.wget -qO - https://www.mongodb.org/static/pgp/server-5.0.asc | sudo apt-key add -

     2.echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/5.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-5.0.list

     3.sudo apt-get update

     4.sudo apt-get install -y mongodb-org

After installation i started using

     sudo systemctl start mongod

if I use mongod --version command it shows :-

     Illegal instruction (core dumped)         

Answer 1

1. Stop the mongod process by issuing the following command:-

   sudo service mongod stop
   

2. Remove any MongoDB packages that you had previously installed:-

   sudo apt-get purge mongodb-org*
   

3. Remove MongoDB databases and log files:-

   sudo rm -r /var/log/mongodb
   sudo rm -r /var/lib/mongodb
   

4. Then reinstall MongoDB 4.4.x

5. Import the public key used by the package management system:-

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

6. The following instruction is for Ubuntu 20.04 (Focal):-

   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
   

7. Update Apt

   sudo apt-get update
   

8. Install MongoDB 4.4.x (Now available 4.4.15)

   sudo apt-get install -y mongodb-org=4.4.15 mongodb-org-server=4.4.15 mongodb-org-shell=4.4.15 mongodb-org-mongos=4.4.15 mongodb-org-tools=4.4.15
   

9. Use mongod --version to check if it is successfully installed

10. If you encounter any error while using mongod

    sudo mkdir /data
    cd /data
    sudo mkdir db
    sudo pkill -f mongod
    

11. Then use sudo mongod command.

12. After long research, it is now working totally fine thanks to this community and Internet.

EDIT:

After following above steps:

if below error occurs:

mongod.service: Failed with result 'exit-code'.

then remove below files and start mongod service again.

sudo rm -rf /tmp/mongodb-27017.sock
sudo service mongod start

More Info

Answer 2

If you use proxmox or other hypervisor, please check your processors setting. Set processors type to host may resolve this issue.

Answer 3

Not the best variant, to downgrade your mongo installation.

Problem cause your host or vm doesnt support an AVX instruction of cpu.

https://www.mongodb.com/community/forums/t/mongodb-community-5-0-12-illegal-instruction-core-dumped-ubuntu-20-04-5-lts/204332

Check if your host supports AVX instruction (lscpu | grep avx), if does, seems you running mongo in vm, check your hypervisor configured to passthrough host cpu features into VM.

If host doesnt support AVX instructions, so downgrade is your choise