SUMMARY
RPCBIND service unable to start on CentOS 7.x systems
ISSUE
open defect w/ CentOS 7 where rpcbind service will not start if IPV6 is disabled
RESOLUTION
grep net.ipv6.conf.all.disable_ipv6 /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
grep net.ipv6.conf.default.disable_ipv6 /etc/sysctl.conf
net.ipv6.conf.default.disable_ipv6 = 1
changed the below params in /etc/sysctl.conf from 1 to 0:
grep net.ipv6.conf.all.disable_ipv6 /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 0
grep net.ipv6.conf.default.disable_ipv6 /etc/sysctl.conf
net.ipv6.conf.default.disable_ipv6 = 0
reboot appliance and on boot confirmed active via:
systemctl status rpcbind
archive media can be mounted again