RAID: Why and When RAID stands for Redundant Array of Independent Disks (some are taught “Inexpensive” to indicate that they are “normal” disks; historically there were internally redundant disks which were very expensive; since those are no longer available the acronym has adapted). At the most general level, a RAID is a group of disks … Read more
Qemu: QEmu is a complete and standalone software of its own. You use it to emulate machines, it is very flexible and portable. Mainly it works by a special ‘recompiler’ that transforms binary code written for a given processor into another one (say, to run MIPS code on a PPC mac, or ARM in an … Read more
Use IPMI to trigger LEDs, increase fan RPMs or sound the beep/alarm. Take a look at the man page for ipmitool https://linux.die.net/man/1/ipmitool depending on the server you may be able to set the LEDs, LCD display, fan RPM offset(listen when nobody is in the office). Some other IPMI or BMC interfaces may allow you to … Read more
OpenSSL will allow you to look at it if it is installed on your system, using the OpenSSL x509 tool. openssl x509 -in cerfile.cer -noout -text The format of the .CER file might require that you specify a different encoding format to be explicitly called out. openssl x509 -inform pem -in cerfile.cer -noout -text or … Read more
TL;DR version: Let Windows handle your memory/pagefile settings. The people at MS have spent a lot more hours thinking about these issues than most of us sysadmins. Many people seem to assume that Windows pushes data into the pagefile on demand. EG: something wants a lot of memory, and there is not enough RAM to … Read more
v=spf1 include:_spf.google.com include:otherdomain.com ~all There’s no restriction against including multiple names in a single entry; Hotmail, for instance, takes this to extremes. Note that multiple includes, or nested ones, need to stay under the limit of 10 total DNS lookups for the whole SPF check.
dd is most certainly the best cloning tool, it will create a 100% replica simply by using the following command. I’ve never once had any problems with it. dd if=/dev/sda of=/dev/sdb bs=32M Be aware that while cloning every byte, you should not use this on a drive or partition that is being used. Especially applications … Read more
Currently it is possible to perform DNS validation, also with the certbot LetsEncrypt client in manual mode. Automation is possible as well (see below). Manual plugin You can either perform a manual verification – with the manual plugin. certbot -d bristol3.pki.enigmabridge.com –manual –preferred-challenges dns certonly Certbot will then provide you instructions to manually update a … Read more
Using -f with ln will overwrite any link that was already there, so as long as you have the correct permissions, it should work… It’s always worked for me. What operating system are you using?
Answer The short answer to your specific question of listing CNAMEs is that you cannot without permission to do zone transfers (see How to list all CNAME records for a given domain?). That said, if your company’s DNS server still supports the ANY query, you can use dig to list the other records by doing: … Read more