Install CentOS 7 minimum resource requirement questions ?

it's high because of CentOS 7 the OS itself requires 1GB minimum memory without anything installed on it - partly due to YUM's memory consumption - so lower memory than 1GB would cause YUM issues. As to disk space requirements it can vary from web host to web host due to CentOS image they use, some on fresh installs on use 5-7GB but some use 10-16GB out of the box so the higher disk requirements are in anticipation of higher default CentOS image disk usage possibility. So you can use your own judgement on disk space requirements - so if you use a 25-30GB disk VPS and only 4-7GB gets used after Centmin Mod install it maybe ok for your usage - only you would know. On the other hand if you have 25GB disk VPS and after install it is using 16-18GB, then definitely not ok if you require more memory.

Also might want to check out these threads which will shed some light on it some more

• Raising minimum & recommended disk requirements for Centmin Mod LEMP installs | Centmin Mod Community
• Disk space is going away | Centmin Mod Community

You can use these commands to find where the disk space usage is going but do not go blindly deleting data as some of it would be for system operation so you can break your server deleting incorrect data.

Code (Text):

df -h
du -h --max-depth=1 /
du -h --max-depth=1 /home
du -h --max-depth=1 /usr
du -h --max-depth=1 /var

For Centmin Mod Nginx vhost specific i.e. where you upload your site's files for your site files etc.

Code (Text):

du -h --max-depth=1 /home/nginx/domains

any sensitive directory names for your site files etc can be masked by you manually as you don't want to publicly list them if possible

 

Read how linux uses memory Help! Linux ate my RAM!. The memory increase is when doing YUM tasks like yum updates which requirement minimum of 1GB. Sometimes it's ok to swap if you have fast disks and limited budget. But generally optimal performance is having right amount of memory as required without swapping.