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To get magento admin details programatically you need to add below mentioned code in your class.
Upgrade magento 2 to latest version
Note : Before running upgrade should have to take database and file backup.
To upgrade magento 2 from UI you have to follow below mentioned document.
Install ClamAV and Scan Viruses with ClamAV
Install solr in UBUNTU with command line. Please find below mentioned command for installation.
You can disable the compiler from ssh also. login to server with ssh and go to magentoroot\shell and use below mentioned commands.
You can install ftp to your Amazon ec2 instance and able to provide access to other developer to work parallel on same in instance.
Setup dedicated server or Amazon ec2 instance for magento 2. Install nginx, php-fpm and MySql server and setup virtual host configuration.
Create a user for providing access to other developer or use for virtual host in linux. It will also use for providing limited access for user like only read access, read or write access etc.