Normally, rsync skips files when the files have identical sizes and times on the source and destination sides. This is a heuristic which is usually a good idea, as it prevents rsync from having to examine the contents of files that are very likely identical on the source and destination sides. –ignore-times tells rsync to … Read more
Yes, the number there is the number of seconds left until that record expires (providing we’re not querying the authoritative nameserver). Obviously with a CNAME there’s a level of redirection, so the TTL for the A record it points to in this case may be important as well. If you wait a couple of seconds … Read more
The access control configuration changed in 2.4, and old configurations aren’t compatible without some changes. See here. If your old config was Allow from all (no IP addresses blocked from accessing the service), then Require all granted is the new functional equivilent.
An AMI, as you note, is a machine image. It’s a total snapshot of a system stored as an image that can be launched as an instance. We’ll get back to AMIs in a second. Lets look at EBS. Your other two items are sub-items of this. EBS is a virtual block device. You can … Read more
I almost cringe to do this, but if you’re serious about recovering your data, and you don’t have backups, you’ll need a higher-end data recovery service. Watch out for fly-by-nights shops that will be peddling/scamming in your area, and go with an actual top-tier data recovery service. (And be prepared to pay $$$$ for it.) … Read more
See: Robocopy /? Usage : ROBOCOPY source destination [file [file]…] [options] robocopy c:\folder d:\folder transfer_this.txt
For units that are defined in actual, static files, this can be seen in systemctl status: $ systemctl status halt-local.service ● halt-local.service – /usr/sbin/halt.local Compatibility Loaded: loaded (/lib/systemd/system/halt-local.service; static) Active: inactive (dead) But there are units that are not defined by files, e.g. with systemd-cron installed. These have no useful location listed with status: $ … Read more
Terminated instances will go away after a few hours. There is nothing you can do to manually remove them. Not to worry, you won’t get billed for it.
While top is running, you can press c to toggle between showing the process name and the command line. To remember the toggle state for next time, press W to save the current configuration to ~/.toprc.
I add my own favorite: Cheat Sheets on PacketLife.com has some very nice ones on network technology topics. Cheat sheets are in PDF format. You are welcome to use and redistribute them as you please, so long as they remain intact and unmodified. Currently there are six categories: Protocols: BGP, EIGRP, First Hop Redundancy, IEEE … Read more