I often use Webmin and Virtualmin to manage basic stuff on Linux servers, mostly so because others sometime need to change minor settings on these servers, and they may or may not be very familiar with doing things from the CLI. You can, of course, …
When or if you run into trouble with apt-get and IPv6 connections timing out or not resolving properly at all, it may be a good idea to simply prevent apt-get from using IPv6. Use -o Acquire::ForceIPv4=true when running apt-get, or create /etc/apt/apt.conf.d/99force-ipv4 and put Acquire::ForceIPv4 …
There are many posts about nginx, re-directs, PHP, and WordPress. There are somewhat fewer posts that talk about (internal) re-writes, where the request by the web browser is mangled to be served by another resource than the one requested. For example, I may want a …
There are a number of ways to figure out your current public IP address automatically, which can be extremely useful for Dynamic DNS (DDNS) situations or other automation ventures, here are some of them. OpenDNS dig +short @resolver1.opendns.com ANY myip.opendns.com If the above doesn’t work, …
While attempting to create a Let’s Encrypt SSL certificate using certbot for a number of domains, I ran into something that appeared to be a timeout issue in the certbot client and/or one of the Python libraries used by it. I found this thread, which …
As I recently handled a migration from Zimbra 8.7.11 to Zimbra 8.8.12, I’ve been running into things I think the Zimbra updater should handle by itself, and/or things that should be documented in a more practical way than they currently are. I’ll just keep updating …
As he re-entered the sfdisk dump manually in the remote recovery console, using the devil’s editor (vi), he was silently thanking the Linux developers for not screwing around with the file system when it cannot be mounted. Messing around with partition tables, disk volumes, and …
nmap -p 443 site.com nmap -p 21,22,2222,80,443 site.com nmap -p 50-100 site.com nmap is a very versatile tool for analyzing remote hosts. Given the above examples, nmap will return the scanned ports’ status as open, closed, filtered, and so on.
lsof -Pnl +M -i4 lsof -Pnl +M -i6 or netstat -tulpn netstat -npl There are obviously a number of ways to accomplish this, but these variations will cover a lot of ground. You can also combine this with grep to filter out things you don’t …
mtr –report –report-cycles 20 www.instagram.com > ignetrpt.txt The above should be entered on one line. Using MTR this way makes it easy to simply send a trace report via e-mail. It can also be used in an automated way to generate a report e-mail when …