I consider the residential gateway overloaded. Your ISP is in the business of selling you the cheapest possible computer component to be a gateway device. Current devices also include a WiFi radio to double as home access point. By setting up a Raspberry Pi as your DHCP server and DNS forwarder, you can remove that… Read more »
Recently, we saw what happened with the botnet attack on Dyn, but instead, let’s talk about a fine day on a happy Beatrix Potter-like Internet, shall we? We start on your local network: your DSL modem (or cable box) is your residential gateway. There’s a little hedgehog inside, helping the hamster in your computer fetch… Read more »
Here’s a fun little project that is a pretty good combination of array use and pattern manipulation. #!/bin/bash function get_mhz() { while read line; do if [[ $line =~ cpu\ MHz ]]; then local hunks=(${line}) local ahz=(${hunks[3]}) local bars=$(( (${ahz%%.*} * (${COLUMNS} - 12) )/3500)) printf “%s:%${bars}s\n” $ahz ‘=’ | tr ‘ ‘ ‘=’ fi… Read more »
Part 1 | Part 2 Welcome, ensign, to our debrief. It sounds like you had troubling times…using…computers. Starfleet reports that citizens apparently have already encountered a form of your file system corruption problem. They report…unexplained crashes, file system corruption but no corresponding SMART data or bad blocks as a cause. I finally got to a… Read more »
Part 3 | Part 1 Slow SSD, part 2: Protecting my Partitions The beautiful spring weather was denied me by my flaky computer. I would be working away, notice that I needed a new package, and then get an error: read only file system failure message when trying it. Once, I even rebooted into an… Read more »
Part 2 | Part 3 File-system integrity! Boring words, right? You’ve got work to finish. Your system froze in the middle of doing updates. When was my last backup? About as boring as a heart attack when your system won’t boot because your / (root) partition is corrupt. All of those thoughts raced through my… Read more »
Files getting lost or corrupted? A most heinous challenge, dude! So when strange things are afoot at the Linux-workstation, we totally hit our backups. We need to get started…but what commands should we use? We can use: 1. tar to make daily backups of all files, 2. or combine find and tar to back… Read more »
Gnarly Backup School Series Getting backups done is important. Sometimes what you have to backup and what you want to backup make quite the contrast. Consider I never want to back up my .mozilla/firefox//cache directory. Let’s cover how to avoid that. Because if you don’t, things get really bunk, little dude. Before you freak… Read more »
Being on pager duty is a downer. And it’s a big mistake that ruins the on-call or first-responder position when you allocate no-no time to actually invest in a useful reporting platform. Like many before me, I used to create exactly that evil: write a bash script, and throw it in cron. Example of the… Read more »
I probably could have done this in perl and it would have been much faster…but I could say that about a lot of things. My problem is that Perl is not my command-line. Perl can be a REPL, but bash always is a REPL. Ever look at a patch file? If you’re a programmer that… Read more »
