Switch Magento 2 environment mode

The Magento 2 have 3 main environment modes.

1. Default Mode - After fresh installation, if there is no other modes are not specified, our Magento 2 will be in default mode
2. Developer mode - During development & customization, we have to use Developer mode
3. Production mode - When we deploy our Magento installation to a production server, it must be production mode

The difference and details are avilable in the Magento Dev Doc.

Know the current mode

magento deploy:mode:show

Swich between Magento mode

I believe that your current directory is Magento installation root folder. If so, the command will be,

magento deploy:mode:set {mode}

Example - Switch to production mode

bin/magento deploy:mode:set production

Example - Switch to Developer mode

First delete the contents of the var/generation and var/di directories.

rm -rf var/di/* var/generation/*

Thedn switch mode

bin/magento deploy:mode:set developer

Note: We cannot currently change from either developer or production mode to default mode. Unless we specify developer / production mode, Magento installation will be in default mode.