Error debconf: unable to initialize frontend: Dialog
I got an error message while building my new docker images to set default setting on Postfix configuration : debconf: unable to initialize frontend: Dialog debconf: (Dialog frontend will not…
Custom SSL Certificate Deployment on vCenter Server 6.7
In the previous article, I discussed the installation and activation of the SSL certificate on vSphere host 6.7. The process is relatively easy. The same thing I tried to apply…
Commercial SSL Certificate Deployment on vSphere Host 6.7
By default vSphere uses an SSL certificate from VMware Certificate Authority (VMCA). If accessed through a browser, the https access will be considered untrusted. If you have the trusted SSL…
Intel NUC NUC817HVK Hades Canyon VR Edition
Last Friday I received a package containing the Intel NUC Hades Canyon series NUC817HVK VR Edition. This is one of the Intel NUC series with a qualified specification suitable for…
Zimbra MariaDB Error : Can’t init tc log
A few days ago, our clients had problems with their on-premise mail server deployment. Their Zimbra services are down and mailbox service could not restart. After a quick check, it turns…
Script to Add Dynamic IP to /etc/hosts
I have a dynamic IP from my internet service provider and sometimes it takes longer to SSH to my server as it needs to resolve the address. On static IP,…
Script to Remove Over Quota Message from Zimbra Queue
Sometimes we have a bunch of over quota message filling up Zimbra queue, with detail as below : 197CF170F9 59761 Wed Oct 24 09:49:48 email-palsu@vivianchow.id (host alt1.gmail-smtp-in.l.google.com[74.125.195.27] said: 452-4.2.2 The…
Upgrading Amazon Lightsail Instance
I have some Amazon Lightsail Instance, a group of small server used as a load balancer for our SMTP cluster. Amazon Lightsail in short equivalent with DigitalOcean Droplet or Linode Node…
Fail2Ban, Zimbra’s DoSFilter and Failed Login Lockout Policy
On each Zimbra deployment strategy, I’ve never activate Failed Login Lockout Policy as it tend to block legitimate user from being logged in due to brute force attack from others.…
Script to Delete the Spam Queue on Zimbra with Confirmation
On previous script, we can delete spam from queue by passing sender or recipient address on the script : [code lang=”bash”] pfdel email-spammer [/code] But what about situation where spammer…