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Mastering the Art of Changing Java Versions in Ubuntu: A Comprehensive Guide
To change the default Java version in Ubuntu, you can follow these steps: Check the installed Java versions on your system using the command: 1. Check the installed Java versions on your system using the command: This command will list all the installed Java versions on your system along with their paths. 2. Choose the version that you want to use as the default by typing the number next to it. 3. Press Enter to confirm your selection. 4. Check the version of Java that is currently set as the default by typing the command: This command will display the version of Java that is currently set as the default…
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Can I install iDempiere ERP on Raspberry pi 4 ?
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How to install iDempiere ERP on your Raspberry Pi
This guide will teach you how to quickly make an Ubuntu Operation System SD card, boot it on Raspberry Pi 4, and set up the iDempiere server. Preparation Optionally: Prepare the SD Card Download Raspberry Imager from the raspberry pi official website. Windows:https://downloads.raspberrypi.org/imager/imager_latest.exeMacOS:https://downloads.raspberrypi.org/imager/imager_latest.dmg Ubuntu:https://downloads.raspberrypi.org/imager/imager_latest_amd64.deb I use MacOS to demonstrate. The following action is very important, to set your Linux account password Once it’s set, you can grill it Connect to Raspberry Pi 4 After the Raspberry Pi has been booted, you can connect to it using Secure Shell (SSH). If you don’t know the IP address of your Raspberry Pi, you can use a network scanner tool like “Angry IP…
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What is the difference between ufw and iptables?
ufw and iptables are closely related. In Ubuntu, ufw is a front-end interface to iptables that provides simpler commands and options for setting iptables rules and managing the firewall. When you set up a firewall with ufw, it actually updates the iptables ruleset. Thus, you can use ufw to manage iptables rules without editing the iptables ruleset directly. ufw 和 iptables 有密切的關係。在 Ubuntu 中，ufw 是 iptables 的前端界面，它提供了更簡單的命令和選項，用於設置 iptables 規則和管理防火牆。當你使用 ufw 設置防火牆時，實際上它會更新 iptables 規則集。因此，你可以使用 ufw 管理 iptables 規則，而無需直接編輯 iptables 規則集。 Ubuntu 中的 ufw 工具。它是一個簡單的防火牆工具，可用於在 Ubuntu 上輕鬆配置和管理網絡訪問控制。 The ufw tool in Ubuntu. It is a simple firewall tool that can be used to easily configure and manage network access control on Ubuntu.…
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Raspberry Pi 使用DDNS應用
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iDempiere Port Forwording
iDempiere 預設 https port 為 8443. 若要修改為443 需要用到 root 權限. 安全上考量,建議維持 8443 Port. 再利用 iptables 進行Port Forwarding即可. 參考程式碼如下.
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EMail 自主管理或代管比較
企業或組織幾乎都會有自己的專屬網域來管理員工的信箱，例如 ninniku.tw 而不會使用免費信箱來做為對外聯繫信箱。 專屬網域有許多好處： 1. 離職員工信箱管理：可以設定離職員工信箱FORWARD到該主管信箱。 2.可以對員工信箱進行備份。 3.可以和企業資訊系統整合。 專屬網域可以用代管或自行建立主機管理兩種方式。 評估兩個關鍵點： 1.員工人數 2.是否有能力維護。 以下計算邊際人數，超過該值，建議自主管理比較有利。 Gmail 一個帳號五年的成本 9,000。 邊際人數= 65,000 / 9,000 = 7.2 Gandi 一個帳號五年的成本 3,780。 邊際人數 = 65,000 / 3,780 = 17.2 法商 Gandi https://www.gandi.net/zh-hant/domain/email 美商 BuleHost https://www.bluehost.com/hosting/shared 第一期：實作參考說明 以QNAP NAS 為硬體平台。 在QNAP 虛擬化技術中，安裝 Ubuntu Linux server 做為郵件伺服器。 在QNAP 或 Ubuntu Linux 安裝 LDAP Server。 Mail 及 Web Mail 安裝 SSL 加密功能。確保資訊安全。 在QNAP用共用資料夾分享，做為網路磁碟。 在Ubuntu安裝Webmail Server 選項：準備另一套NAS做為同步備援。
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