Configure OpenDKIM with Postfix on Debian What are opendkim signing criteria? And how Configure OpenDKIM with Postfix on Debian? Our goal is configure OpenDKIM to sign emails for multiple domains. Linux Debian Security Networking
rsyslog on debian server Enable Rsyslog Logging on Debian This step by step tutorial will take you through how to enable rsyslog logging on Debian 12. Debian 12 bookworm uses systemd-journald logging by default. As such, it has deprecated the use of Rsyslog for logging so as to prevent the log messages being written twice on disk. So, how can you enable rsyslog logging on Debian 12 and higher? Rsyslog vs Journald Rsyslog and Systemd-journald are both logging systems commonly used in Linux distributions for collecting and storing log data. Debian
BIND: Disabling IPv6 responses in bind dns server When using Bind9 as DNS service in your own network, it can be helpful to disable IPv6 (AAAA) responses to avoid the client to try to communicate via IPv6 if it hasn't been setup. Debian Linux Networking
BIND DNS server - permission denied How Fix BIND DNS server permission denied problem after log directory or log file change. Bind server failed with error: isc_stdio_open failed: permission denied Debian Linux Networking
Bonding - teaming 802.3ad LACP on Debian Server NIC teaming (Ling Aggregation) presents an interesting solution to redundancy and high availability in the server/workstation computing realms. With the ability to have multiple network interface cards, an administrator can become creative in how a particular server accessed or create a larger pipe for traffic to flow through to the particular server. Debian Linux Networking
Debian - Source Routing In some circumstances we want to route packets differently depending not only on ip destination addresses, but also on other packet fields: source address, IP protocol, transport protocol ports, or even packet payload. This task is called policy based routing - PBR. Debian Linux Networking
Debian Permanent Static Routes In this tutorial we are going to learn how to add permanent (persistent) static route in Debian or Ubuntu Linux. Debian Linux Networking
How disable swap in debian or linux system swappiness Swappiness is a Linux kernel parameter that controls the relative weight given to swapping out runtime memory, as opposed to dropping pages from the system page cache . Swappiness can be set to values between 0 and 100 inclusive. A low value causes the kernel to avoid swapping, a higher value causes the kernel to try to use swap space. The default value is 60, and for most desktop systems, setting it to 100 may affect the overall performance, whereas setting it lower (even 0) may decrease response latency. Debian Linux
Install Non Free Firmware to Debian linux based distros I install debian stretch to my old IBM System x3650 yesterday. This old server has a NetXtreme II BCM5708 Gigabit Ethernet from Broadcom that need a load non free firmware. And my install attempt crash with this error: [ 82.956477] bnx2 0000:03:00.0: firmware: failed to load bnx2/bnx2-mips-06-6.2.3.fw (-2) [ 82.956481] bnx2 0000:03:00.0: Direct firmware load for bnx2/bnx2-mips-06-6.2.3.fw failed with error -2 So, how load this non free firmware during instalation and make a NIC ethernet card to UP ? Debian Hardware
Debian Linux and LSI MegaRAID SAS This HowTo show how to check the health of Hard Disks connected to a LSI Logic/Symbios Logic MegaRAID SAS 2108 RAID controller under linux. But is very useful for another hw raid controllers. We look for its presence in the system: ~] lspci | grep RAID 01:00.0 RAID bus controller: Broadcom / LSI MegaRAID SAS 2108 [Liberator] (rev 03) Bingo!, we can work with this one. Install linux utilities LSI provide megacli, a proprietary management command line utility. Debian Linux Hardware
Useful tips for Debian based distros Debian bookworm - behavior of more utility has changed I've just ran apt upgrade and apt dist-upgrade and noticed the behavior of more utility has changed. In particular I have to supply -e option in my scripts otherwise it currently presents me with (END) prompt in console. Or when I have alias with more utility, example: alias lf="ls -alFh|more", the output end with (END) prompt in console. Manual says the following: Debian Linux Linux Utilities
Certbot - Let's Encrypt certificates on Debian server with Apache webserver How install and use certbot on Debian system, examples how create Let's Encrypt certificates for multiple domains, how handling certbot automatic renewal. It covers a apache2 webserver configuration for using cerbot generated certificates. Setup is made for Debian and debian based linux distributions Linux Debian Security Web Servers
