Have an existing API within AWS AppSync and need to connect it from a React web application? If you are not completely new to GraphQL you should know that the most popular GraphQL client is Apollo.
29 Code Snippets for WordPress Users
Tired of installing tons of WordPress plugins for small features? You can use code snippets to do certain things without a dedicated plugin. Generally the functions.php file is the place to add code snippes.
Easy Dual WAN Load Balancing with MikroTik RouterOS PCC
RouterOS’s load balancing is simple but tricky. Even Mikrotik shows an example of how to configure PCC for load balancing. It does not say how to implement it with dynamic IP. The method introduced here is simple. We will add lease scripts to WAN1 and WAN2. RouterOS will run the script to add the correct gateway IP and firewall rules to make the load balancing work.
Set custom DNS servers on Linux with resolv.conf
resolv.conf is the configuration file for DNS resolvers for all Linux distributions, including Debian, Mint, Ubuntu, RedHat, CentOS, etc. Usually we change the DNS resolvers list by editing resolv.conf. However, depends on your dhcp client configuration, resolv.conf may be rewrite after reboot. Without deep Linux experience, setting customs DNS servers on Linux maybe time consuming. But one thing we can do is make /etc/resolv.conf immutable to other program after you changed it. This will be the easier setup with no side effects on system.
Protect your WordPress from Automated Comment Spam and Brute Force Login Attack
Is your WordPress flooded with spam comment or being attacked by brute force login attempt? Thinking about spam blocking plugin? There are a lot of plug in can help you stop spam comment. You will notice it put thousands spam comments into spam folder after a while. Those Anti-Spam did a great job stopping spam comment show up in our post. There is some drawbacks for that kind of plugin. First,spam comments will be processed and store in your database before it gets deleted manually or automatically. Second, plugin like Akismet Anti-Spam will add a java-script to your site. If your site has limited resources, these kind of activities will drag down your site’s performance. If you use captcha plugin, you will also interrupt user’s experience.
Asus Z87-A MacOS high sierra upgrade prepare with clover
This guide is for upgrading your system from previous version to high sierra 10.13.x. For how to prepare USB installation kit, check here: Install Mac OS X with clover EFI bootloader on ASUS Z87a 
Fix error - Mediakit reports not enough space on device for requested operation
If you tried use MacOS’s disk utility to erase or format a old/new hard drive, you may encounter some issue. MacOS will show below error when you tried to erase or format the drive, regardless your hard drive space:
Open PDF/A PDF file without read-only mode
The file you have opened complies with the pdf/a standard and has been opened read-only. If you open a PDF/A standard PDF, in default you will not able to modify it because Adobe PDF reader or Acrobat will open it in view only mode.
Ricoh SP C250DN C252DN PPD CUPS driver for LINUX and macOS
C250DN or C252DN can be driven by setting PCL6 and use CUPS+Gutenprint driver. However, if we use Generic driver, it will not print out color.
Edit Hosts file to override DNS record for domains
Hosts file will instruct your machine to go directly to an IP address for specified domain instead of checking with DNS server. For example, point www.qualityology.com and qualityology.com to Google Cloud Platform server: