I read this today, and thought it’s worth sharing:
“The impact of containerization in redefining the enterprise OS is still vastly underestimated by most; it is a departure from the traditional model of a single-instance, monolithic, UNIX user space in favor of a multi-instance, multi-version environment using containers and aggregate packaging. We are talking about nothing less than changing some of the core paradigms on which the software industry has been working for the last 20 – if not 40 – years.”
And yet it is tempered with reality:
“…we are really only at the beginning of a long journey…”
My last remaining grandparent, Artha Robinson, passed away last Saturday. I’m glad to have known her and my grandfather well, to have been able to visit with them and laugh together. I will miss grandma, although I’m glad that she is free from physical pain. As my grandfather often said, “growing old is not for the faint of heart.”
Jesse and Artha Robinson
Grandma always expressed interest in her grandchildren and great grandchildren. She cared deeply for others and would go out of her way to help them. During the past few years, she read books to one of her neighbors who had lost her eyesight.
I remember eating with my grandparents, and finding out that dinner didn’t just include one vegetable — it included two or three, because eating plenty of vegetables is a healthy habit. Meals included a myriad of vitamin supplements, because they wanted to live good and long lives. Grandpa liked to do the grocery shopping, and they’d prepare meals together.
Grandma would jump on her indoor exercise trampoline and do aerobics. Grandpa gardened, and went walking.
They did their own taxes, and every year when April 15th rolled around, the kitchen table would be filled with papers and folders, and they’d file for an extension so they could finish.
It seemed that even when grandma felt terrible, she had her hair done beautifully.
Grandma was the hub of our extended family, and now that she’s gone, it will be interesting to see how well we stay in touch. Perhaps Facebook will help that process along, but it’s not as good at forming relationships and renewing friendships as getting together, face-to-face.
In the past, I’ve had trouble getting my Ubuntu machine to resolve the .local hostnames at work. I didn’t know why Ubuntu had this problem while other machines did not.
When I did a DNS lookup, it failed, and ping of host.something.local failed. Yet ping of the hostname without the .something.local extension worked. Odd. I googled various terms, but nothing useful came up. I tried watching the DNS lookup with tcpdump, but it didn’t capture anything.
Eventually, I thought of using ‘strace ping host.something.local’ to see what was happening, and it turns out that DNS was never being queried — it was talking to something called avahi.
I googled “avahi”, and was reminded that hostname resolution is configured in /etc/nsswitch.conf. In the case of Ubuntu, it’s configured to send *.local requests to Avahi (mdns4_minimal), and no further — i.e. if Avahi doesn’t resolve it, it doesn’t try DNS.
In my case, I want corporate DNS to resolve .local addresses. So I changed my /etc/nsswitch.conf from this:
hosts: files mdns4_minimal [NOTFOUND=return] wins dns mdns4
to this:
hosts: files wins dns mdns4_minimal mdns4
And now my Ubuntu development machine can communicate with our internal .local machines without having to resort to using IP addresses, short names, or having to place the mapping in /etc/hosts.
Interesting: “about half of your devices, including chargers, storage, cameras, CD-ROM drives, SD card adapters, keyboards, mice, phones, and so on, are all likely to be proven easily reprogrammable and trivially used to… attack software. Unfortunately, the only current solution on the horizon is to not share any USB devices between computers.” — Dragos Ruiu
Say you’ve got the following log files with the oldest entries in myapi.log.3.gz:
myapi.log.1.gz
myapi.log.2.gz
myapi.log.3.gz
If you want to ‘grep’ them for a string, in order of date, oldest to newest, there’s no need to extract them one at a time, and there’s no need to concatenate the files first. Use sort to put the files in the proper order, and zgrep to search though the compressed files.
SaltStack is a great infrastructure management tool. I don’t always want to use the latest version, so it’s useful to know where to download older releases. The problem is that using EPEL to install it on CentOS/RHEL systems only offers the latest version.
Fortunately, it’s possible to download old RPM packages from the following URLs — thanks to “forrest” on the SaltStack IRC channel for digging up this information.
– Make a backup of the salt-master
– Upgrade the salt master
– Install the ‘at’ package on all minions (my minions are linux)
– salt ‘*’ pkg.install at
– Enable and start the at service
– salt ‘*’ service.enable atd
– salt ‘*’ service.start atd
– Run a script
– Copy and paste the code below into your salt directory, typically /srv/salt/upgrade_minion.sh
– salt ‘*’ cmd.script salt://upgrade_minion.sh timeout=15
Here’s the script. Note: It would be safer (and faster) to download from a trusted internal HTTP server.
Given how much of what is on smartphones is now automatically backed up to the cloud, anyone should take pause before disrobing before their smartphone camera—regardless of the phone operating system or how that image will be delivered to its intended audience. The security of all of these services is only as secure as the obscurity of the mother’s maiden name of the person you sent that picture to—or of the next zero-day flaw.
I don’t think smartphones belong in bedrooms or bathrooms, but since most people want the convenience of having them there, it may be a good idea to keep the phone in the drawer while changing, or covered while showering, etc.
I think it’s a good idea to assume that what one’s smartphone can hear, see, or the data it contains could be made public someday — and perhaps sooner than we think. The same is true for any data we store “in the cloud”.
Arstechnica has a fascinating story about the new HTML picture element and how it came to be.
It’s interesting to read about the tangled web of standards bodies and their willingness to accept outside feedback, and it’s good to hear that it’s getting better.
The other day I was exporting json data from mongodb using mongoexport, and needed a way to exclude certain subdocument fields. mongoexport doesn’t support excluding fields.
The last time I tried creating a bootable USB flash drive, it didn’t boot. Today, I needed the latest Ubuntu, and found that Rufus (for Windows) creates usable bootable USB drives from ISO images.
