Server hard-drive capacities are miniscule compared to desktop hard-drive capacities. 450 and 600GB are not uncommon sizes to see in brand new servers, and you could buy many 4TB SATA desktop drives for the price of one 600GB SAS (server) hard drive. Your SATA hard-drive in your desktop PC at home is like a muscle … Read more
Probably because the x86 line became synonymous with 32 bit processors for quite some time, while x64 was specifically a designation for 64 bit as applications and operating systems were transitioned over, and now there are software applications that require the 64 bit designation in order to run (like some VM software). In other words, … Read more
Port 25 needs to be open in order for it to receive mail from the internet. All mail servers will establish a connection on port 25 and initiate TLS (encryption) on that port if necessary. Secure SMTP (port 465) is used only by clients connecting to your server in order to send mail out. Port … Read more
It depends on whether you want to delegate hosting the subdomain off to a different DNS server (or to the same server, but in a different zone file). You delegate a zone when you want some other entity to control it, such as a different IT department or organization. If you do, then you need … Read more
On a Big Endian-System (Solaris on SPARC) $ echo -n I | od -to2 | head -n1 | cut -f2 -d” ” | cut -c6 0 On a little endian system (Linux on x86) $ echo -n I | od -to2 | head -n1 | cut -f2 -d” ” | cut -c6 1 The solution … Read more
The apt history is in /var/log/apt/history.log as said in a comment above. That said, this will not list packages that were installed manually, using dpkg or GUIs such as gdebi. To see all the packages that went through dpkg, you can look at /var/log/dpkg.log.
stop the VM run qemu-img resize vmdisk.img +10G to increase image size by 10Gb start the VM, resize the partitions and LVM structure within it normally
The data=writeback mount option deserves to be tried, in order to prevent journaling of the file system. This should be done only during the deletion time, there is a risk however if the server is being shutdown or rebooted during the delete operation. According to this page, Some applications show very significant speed improvement when … Read more
There’s quite a bit about this topic in the documentation: Includes vs. Imports Dynamic vs. Static The main difference is: All import* statements are pre-processed at the time playbooks are parsed. All include* statements are processed as they encountered during the execution of the playbook. So import is static, include is dynamic. From my experience, … Read more
Unless the instance is in a VPC, security groups can only be chosen before you start your instance for the first time. Only VPC instances can change security group. For information on VPC see here.