Linux

Converting crt to PEM

ByEtzion 04/10/2006

Took two steps:

openssl x509 -in input.crt -out input.der -outform DER

openssl x509 -in input.der -inform DER -out output.pem -outform PEM

Disk Storage | Linux

Extend /boot from within a Linux system
ByEtzion 27/03/202127/03/2021

This is a tricky one. In order to resize /boot, which is, commonly the first partition, you need to push forward the beginning of the next partition. This is not an easy task, especially if you are not using LVM – then you have to use external partitioning modification tools, like PQMagic (if it still…

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bash | Linux | Scripting/Programming

The StartTLS replacement for the old telnet to SMTP server on port 25
ByEtzion 23/02/2018

When you need to troubleshoot SMTP issues, it is a known fact that a simple telnet to port 25 of the SMTP server in question would get you far. It will get you to see the problems. When connecting to Office365 (outlook.com) to relay mail, and you want to check how things work, you can…

Read More The StartTLS replacement for the old telnet to SMTP server on port 25
bash | Disk Storage | Linux | Scripting/Programming

An excellent alternative to ‘rsync’ for backups to cloud
ByEtzion 23/02/202323/02/2023

I have been using NextCloud for a long while now. It is a smart solution, and although I do not like its agent (I’ve had many problems with it around Hebrew file names on multiple types of operating systems, which never matured enough for a full bug description and details) – for an easy access…

Read More An excellent alternative to ‘rsync’ for backups to cloud
Linux | Scripting/Programming

Centreon and batch-adding hosts
ByEtzion 27/04/2009

Centreon is a nice GUI wrapper for Nagios. It is using MySQL as its configuration engine, and it functions quite well. One thing Cacti can do but Centreon can’t is mass automatic addition of servers. I have had a new site with an installed Centreon, and I wanted to add about 40 servers to be…

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Disk Storage | Laptop | Linux

Ubuntu 18.04 and TPM2 encrypted system disk
ByEtzion 27/05/201919/01/2022

*** EDIT *** : An updated version of this post can be found here: https://run.tournament.org.il/ubuntu-20-04-and-tpm2-encrypted-system-disk/ When you encrypt your entire disk, you are required to enter your passphrase every time you boot your computer. The TPM device has a purpose – keeping your secrets secure (available only to your running system), and combined with SecureBoot,…

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bash | Linux | Scripting/Programming

Bonding + VLAN tagging + Bridge – updated
ByEtzion 25/04/2012

In the past I hacked around a problem with the order of starting (and with several bugs) a network stack combined of network bonding (teaming) + VLAN tagging, and then with network bridging (aka – Xen bridges). This kind of setup is very useful for introducing VLAN networks to guest VMs. This works well on…

Read More Bonding + VLAN tagging + Bridge – updated

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