5 Great Commands to Monitor Network Bandwidth

Commands to Monitor Network Bandwidth

5 Great Commands to Monitor Network Bandwidth on Linux Server   Linux network traffic monitoring is one of the main parts of Linux troubleshooting. And can be done by many network monitoring utilities. In this article we will discover 5… Continue Reading

Ubuntu 18.04 LTS Set Hostname Permanently

Ubuntu 18.04 LTS Set Hostname Permanently   In this article I will show how to set hostname in Ubuntu server 18.04 permanently. Lets say my server old hostname is: serv and should be changed to: serv1. Ubuntu Server 18.04 Set… Continue Reading

Zimbra. Postfix_rbl_override.lmdb: No such file or directory

How to fix Zimbra mail server error: lmdb:/opt/zimbra/conf/postfix_rbl_override is unavailable. open database /opt/zimbra/conf/postfix_rbl_override.lmdb: No such file or directory. To build missing postfix_rbl_override.lmdb file run postmap and zmprov. # /opt/zimbra/common/sbin/postmap /opt/zimbra/conf/postfix_rbl_override # /opt/zimbra/bin/zmprov mcf +zimbraMtaRestriction ‘check_client_access lmdb:/opt/zimbra/conf/postfix_rbl_override’