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1. Block ads using DNS on OpenWRT

   Recently I switched to OpenWRT as my gateway to the Internet. It has been a great pleasure. Stock firmware of routers just sucks. With OpenWRT, I can ssh into it, install packages, a nice web interface, the configuration makes sense, super smooth and quick, ad blocking, VPN, so on and …

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2. How to install openwrt on redmi ac2100

   Redmi ac2100 is a pretty good router for home use, except that its rom is a "highly customized" openwrt which restrictions are too strict and I remember that several years ago xiaomi added some nasty "functionalities" into their router devices which can inject javascript int web pages users browse and …

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3. What to do when ssh hangs in terminal

   I use ssh a lot. And I met this situation nearly every day: after waking laptop from sleep, I found that I didn't exit ssh connection before I close laptop lid, the ssh connection now hangs there.

   I know this escape sequence(~.) before, but sometimes I found it not working …

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4. How to install ansible on ubuntu 20.04 server

   I am assuming your geo location is in China. Just copy-and-paste the following code into a bash script and execute it. It should work without any problem on a fresh installed ubuntu 20.04 server.

   #!/usr/bin/env bash
   
   apt install python3-pip
   
   pip config set global.index-url https://mirrors.aliyun …

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5. How to get rid of "remote host key identification changed" for good

   First of all, this is violating security rules, but anyway, you can do it.

   Modify ~/.ssh/config like this:

   Host raspberrypi
           HostName localhost
           UserKnownHostsFile=/dev/null
           StrictHostKeyChecking=no
   

   When experimenting with vms and if you are destroying and re-build vms frequently, you might see this warning messages a lot, so …

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