docker search

docker search command allows you to search for images in docker hub. Example To see results with 4 or more

Docker Login

docker login command allows you to login to docker.com. You need to login to docker before you can upload your

postconf

postconf allow you to list/change postfix configuration. To list current config, run To change a configuration, run postfix

Amazon Workmail Review

Amazon Workmail is business email hosting like Google G Suite, Office 365, etc.. https://aws.amazon.com/workmail/ Workmail cost $4 per user, comes

Install Docker on Ubuntu 18.04

To install Docker on Ubuntu 18.04, run On 2018-02-28, the repository have docker version 17.03-2-ce Add your user in docker

portainer – Web based UI for Docker

Portainer is a web based UI for managing docker. https://portainer.io/ You can run it with command Now login to portainer

swap

First create a 2 GB file For 8 GB, use count=8192. You can also use fallocate command instead of dd.

DNS Tools

Reverse DNS/rDNS/PTR Record How to delete Google Cloud DNS Zone DNS Tools https://dnschecker.org https://intodns.com https://dnsmap.io http://leafdns.com https://dnsviz.net https://www.dnsperf.com dig Google

Apache Invalid command Header

On a new Debian server with Apache, web site give 500 internal server error. On checking error log, i found

Tools

DNS Checker https://www.whatsmydns.net/ – web site propogration How to find all subdomains of a domain Search for hosts/SSL SSL Checker

Radio

http://libretime.org/ allow you to run your own radio station. It allow you to manage you media, playlists. It support IceCast

dnsmasq

Ubuntu point all .test domains to 127.0.0.1 Install dnsmasq on Ubuntu