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Single line script for creating crontab entry : (crontab -l 2>/dev/null; echo “*/15 * * * * /path/to/script.sh 2>&1”) | crontab – Ref : https://stackoverflow.com/questions/4880290/how-do-i-create-a-crontab-through-a-script
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…
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…
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…
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…
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…
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,…
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…
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…
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.…