Reset root password on vSphere replication Manager VMs

To reset root password on vSphere replication Manager after being locked use:

Restart the VM and press up and down arrow keys to go to grub console
Use "VMRC" instead of Web console to do this

Optionally add boot delay using https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.vm_admin.doc/GUID-EAAE9426-D08E-4DF1-820B-7C022C2A85FA.html so that there is gap between click power-on and the time when the machine starts to boot
In the grub "linux" line append:
```
rw init=/bin/bash
```
Press F10 to boot
At root prompt remount / as rw using:
```
mount -o remount, rw /
```
Reset password using:
```
passwd
```
Remove existing failed login count and lock information for user root using:
```
/sbin/pam_tally2 -r -u root
```
Umount / and reboot using:
```
umount /
reboot -f
```

Refer:

Anonymous