To rewrite sender addresses in postfix using canonical_maps, you need to configure postfix to use a canonical map file. Create the canonical map file: First, create a file […]
articles
What does “mounted filesystem with ordered data mode. Opts: (null)” means?
The message “mounted filesystem with ordered data mode. Opts: (null)” is typically a kernel log or system message related to the mounting of a filesystem on a Linux […]
articles
IP Address Classes
IP address classes were a part of the original addressing scheme defined in the Internet Protocol (IPv4). However, the concept of classes is largely obsolete due to the […]
articles
Chrony vs NTP
Chrony and NTP (Network Time Protocol) are both protocols and software implementations designed to synchronize the clocks of computers on a network. They aim to ensure that the […]
articles
Why Kdump generates incomplete vmcore?
Kdump is a kernel crash dumping mechanism in Linux that allows you to capture a memory dump (vmcore) when the kernel encounters a critical error or crashes. The […]
issues
growpart fails with “NOCHANGE: partition 2 is size 61888512. it cannot be grown”
Trying to extend partition fails with following error: Check the partion You can see /dev/vda consists of 3 partitions. You can extend only the last partition (/dev/vda3 here). […]
issues
auditd service fails to start with error “Could not open dir /var/log/audit (No such file or directory)”
Starting auditd service fails: The var/log/messages shows: Here, the /var/log/audit is missing. Resolution:
articles
Bridge vs Normal Interface
A network interface is a hardware or software component that connects a device, such as a computer or a router, to a network. It allows the device to […]
howtos
Changing metric value of an interface using nmcli command
Note the current metric value: Find connection name by running nmcli connection show Run nmcli connection modify ipv4.route-metric to change the metric value Run nmcli connection up to […]