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 work on a dumb terminal, an emacs shell buffer, or without a controlling terminal.) debconf: falling back to frontend: Readline The problem itself didn’t stop…
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 to vCenter 6.7 but failed. After several trial & error processes, the problem is most likely because vCenter does not want to use SSL wildcards….
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 certificate (commercial) for your domain name, you can install it to replace the default SSL provided by VMCA. Following is the process to install the…
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 virtualization server, especially for VMware vSphere and Proxmox. With an Intel Core i7-8809G and Radeon VGA, I bought 32 GB RAM (VGEN 16 GB SODIMM…
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 out that one of the disk partitions is full because there is an incorrect mounting disk. As it uses incorrect folder/disk, backup process filling up…
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, I can put the address into public DNS server to a quick resolving process, but as it uses dynamic IP, I would need to use…
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 email account that you tried to reach is over quota. Please direct 452-4.2.2 the recipient to 452 4.2.2 https://support.google.com/mail/?p=OverQuotaTemp m3-v6si2776998pld.435 – gsmtp (in reply to…
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 or a let say it is a simple set of VM comparing to Amazon EC2. As I started with a basic requirement for an SMTP…
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. The legitimate users often become a victim for spammer or robot attempt to login. I would also prefer Fail2ban to block login attempt from spammer…