Centos 6 or 7 no DHCP IP during startup on first boot or reboot solution
This is usually because of STP causing a delay in the negotiation.
Edit your ifcfg script eg:
/etc/sysconfig/network-scripts/ifcfg-eth0
Add a LINKDELAY of 30 seconds or whatever works for you:
LINKDELAY=30
After that you should have an IP during bootup.........
systemd management using systemctl and journalctl to check systemd logs
systemd is like the service manager for your Centos and other modern Linux distributions (including Debian/Mint/Ubuntu) allows you to enable services, stop them, restart them, check their status and even reboot your system.
The key commands or arguments you will use with systemctl are the following:
Unit Commands:
list-units [PATTERN...] List loaded units
&nbs........
Centos 7 Root Password Reset
In Centos 7 the days of editing the "kernel"line and adding "single"are gone. On top of that sometimes after a new install passwords do not work, maybe you forgot your password or for some other reason you need to break in or fix your system? It could also be because you can't mount your root / or some other /etc/fstab error and many other errors.
Short Version:
1. Edit your grub settings and find the linux16 /vmlinu........