MySql Master-Slave Replication

There are two functions when setting up a mysql slave for your database. First for a backup, if your mysql master database goes down you already have a ready to use a a second mysql database environment that has exactly same data with the mysql master without need to restore from dump files where need […]

Installing Certbot For Let’s Encrypt ssl in Ubuntu Server

Since the http2 becomes popular among the method of accessing a service, we need to make sure that we have encrypted service on our webserver. One of the free facility to achieve more secure access over HTTP or https is using SSL and let’s encrypt is one of the tools that we can use. This […]

Zimbra XXE / SSRF Vulnerability Disclosure

Some of my client who uses Zimbra as their mail server having and issue that related to Zimbra XXE / SSRF Vulnerability Disclosure and within include cavalry – CVE-2016-9924, CVE-2018-20160, CVE-2019-9670. Attacker use this vulnerability to gain access and create malware to mine cryptocurrency. Some of the anomalies is; Stuck after login in webmail Failed […]

Proxmox Zfs Send and Recieve

Zfs Z File System or zfs originaly developed by Sun before ported to FreeBSD and to Linux. Combining traditional file system and logical volume manager. However zfs license under Common development and distribution licences (CDDL) is different from GNU licenses that way zfs not included in the Linux kernel. Zfs is an advance file system […]

Managing your Zabbix Queue

Sometimes we need to use the command line to monitor the activity of the Zabbix Queue This is my some of the trick that i know. To first see what would be deleted. As root: /opt/zimbra/postfix/sbin/postqueue -p | egrep -v ‘^ *\(|-Queue ID-‘ \| awk ‘BEGIN { RS = “” } { if ($7 == […]