Category: Linux

What is DASH and HLS? DASH (Dynamic Adaptive Streaming over HTTP) and HLS (HTTP Live Streaming) are both popular streaming protocols used to deliver multimedia content over the internet, but…

Background/Use case sometimes we need want to based on the destimation/domain to use different STMP server ( instead of relying on automatically search mx record) the transport_maps is a good…

New install: Download any .iso file from: ( for debian 12) https://www.debian.org/releases/bookworm/debian-installer/   Cp to usb stick https://www.debian.org/releases/bookworm/amd64/ch04s03.en.html # cp debian.iso /dev/sdX # sync Insert usb to PC to boot…

Screen screen -d -R your_session name //split only the monitor screen ctrl-a ( release the kb ), then press: | for vsplit    —> need this step : ctrl-a, c…

Some good monitoring tools: homer: easy to install with docker for its server and install helifpy on a  sip/client/host : nohup ./heplify -hs homer_server:9060 & grep sngrep, ngrep pcap tcpdump/wireshark…

Learning curve for Kubernetes (K8s) could be steep. For most users who are already familiar with basic networking, OS/Linux,  docker container technologies etc, the difficulties , I personally think,  is…

How gdb generally works In a debugging session, when the debugger wants to set a breakpoint, it replaces an instruction by int3 When the trap instruction (0xCC on x86) is executed,…

SRTP RFCs and h.235 is Not an easy read. Here is my very high level beriefing: AES Encryption (1) AES is the foundation for both srtp and h.235.6 secured rtp…

I spent several days to install openstack on debian 8 at one testing box with two NICs. Finally got a basic working system! It has with a controller node running neutron,…

Finally I got some chances to package one application using docker, here are some useful commands docker images: docker build –rm -t my_tag docker_dir ( with Dockerfile) docker images ,…