Experiencing Technology https://blog.tinned-software.net Tinned-Software Blog Mon, 12 Nov 2018 19:54:48 +0000 en-US hourly 1 https://wordpress.org/?v=4.9.8 Rewrite author of entire git repository https://blog.tinned-software.net/rewrite-author-of-entire-git-repository/ Mon, 12 Nov 2018 19:54:48 +0000 https://blog.tinned-software.net/?p=2584 In git repositories, commit messages contain a person’s email address as an identifier for the user. If the email address used to commit is wrong, you might not want it to be shown in the git repository anymore. In general … Continue reading

The post Rewrite author of entire git repository appeared first on Experiencing Technology.

]]>
Install HP ProLiant Management Utilities https://blog.tinned-software.net/install-hp-proliant-management-utilities/ Mon, 15 Oct 2018 21:48:08 +0000 https://blog.tinned-software.net/?p=2659 The HP ProLiant Support Pack (PSP) for Linux allows reading out hardware details from a HP ProLiant server. this set of tools can be used to read out hardware information, state and logs. Install HP ProLiant Management Components HP provides … Continue reading

The post Install HP ProLiant Management Utilities appeared first on Experiencing Technology.

]]>
LVM Remove physical volume from volume group https://blog.tinned-software.net/lvm-remove-physical-volume-from-volume-group/ Mon, 17 Sep 2018 10:16:16 +0000 https://blog.tinned-software.net/?p=2648 LVM provides flexibility to organize logical volumes without being bound to inflexible partitioning. If set-up correctly, the LVM can grow as the disk/raid might grow. To allow the LVM to grow, the block device needs to be added as a … Continue reading

The post LVM Remove physical volume from volume group appeared first on Experiencing Technology.

]]>
Remove files from git history https://blog.tinned-software.net/remove-files-from-git-history/ Mon, 20 Aug 2018 15:23:23 +0000 https://blog.tinned-software.net/?p=2578 When a repository contains files which should have never been committed, it is hard to remove them from the history as git is built to keep a history, not to change it. The following procedure will explain the procedure to … Continue reading

The post Remove files from git history appeared first on Experiencing Technology.

]]>
Docker container on RHEL fails to start without error https://blog.tinned-software.net/docker-container-on-rhel-fails-to-start-without-error/ Mon, 23 Jul 2018 10:27:03 +0000 https://blog.tinned-software.net/?p=2638 Recently a Docker container refused to start for me without any hint about why in the OS or Docker container’s logs. It turns out that SELinux jumped in and blocked access without logging its interference. Containers which were running in … Continue reading

The post Docker container on RHEL fails to start without error appeared first on Experiencing Technology.

]]>
Set the iLO password from Linux using hponcfg https://blog.tinned-software.net/set-the-ilo-password-from-linux-using-hponcfg/ Mon, 25 Jun 2018 19:30:03 +0000 https://blog.tinned-software.net/?p=2568 No matter if you are looking for a way to manage the iLO settings from the Linux command line or just have lost or forgotten the iLO password, as long as you have access to the Linux system running on … Continue reading

The post Set the iLO password from Linux using hponcfg appeared first on Experiencing Technology.

]]>
Create and merge git branches https://blog.tinned-software.net/create-and-merge-git-branches/ Mon, 28 May 2018 19:13:23 +0000 https://blog.tinned-software.net/?p=2520 Following the philisophy of git, branching is an essential and much used part of the development procedure. When a new feature is developed or a bigger change is to be implemented, a branch is created to work on and later … Continue reading

The post Create and merge git branches appeared first on Experiencing Technology.

]]>
Setup LVM and create logical volume https://blog.tinned-software.net/setup-lvm-and-create-logical-volume/ Tue, 01 May 2018 19:23:52 +0000 https://blog.tinned-software.net/?p=2507 Creating an LVM on a disc / partition allows for a lot of flexibility in managing the storage. Managing a disc using LVM consists of a number of steps, from preparing the disc itself until mounting a volume. With LVM … Continue reading

The post Setup LVM and create logical volume appeared first on Experiencing Technology.

]]>
Extend logrotate for additional log files https://blog.tinned-software.net/extend-logrotate-for-additional-log-files/ Tue, 03 Apr 2018 10:50:32 +0000 https://blog.tinned-software.net/?p=2549 The Linux operating system consists of many different components. Many of them log their activity directly or indirectly into log files. Over time those log files grow and would eventually fill up the disk if there wasn’t a utility like … Continue reading

The post Extend logrotate for additional log files appeared first on Experiencing Technology.

]]>
Manage SELinux boolean policies https://blog.tinned-software.net/manage-selinux-boolean-policies/ Mon, 05 Mar 2018 08:58:37 +0000 https://blog.tinned-software.net/?p=2515 Configuring a new service often means dealing with SELinux. The easiest way is most of the time to set an SELinux boolean. But what are SELiunx booleans and what exactly do they do? I will try to shed a little … Continue reading

The post Manage SELinux boolean policies appeared first on Experiencing Technology.

]]>
Find and extract one file from rpm package https://blog.tinned-software.net/find-and-extract-one-file-from-rpm-package/ Fri, 09 Feb 2018 09:54:13 +0000 https://blog.tinned-software.net/?p=2556 Extracting a configuration file (or any other single file) from a package which is not installed is not a standard operation on rpm based systems, but with the following few steps, a file can be extracted without installing the package … Continue reading

The post Find and extract one file from rpm package appeared first on Experiencing Technology.

]]>
Auditing Linux system security using lynis https://blog.tinned-software.net/auditing-linux-system-security-using-lynis/ Mon, 08 Jan 2018 06:29:31 +0000 https://blog.tinned-software.net/?p=2511 Lynis is a security auditing tool for UNIX and Linux based systems. It performs a security scan on the system and provides suggestions for best practices for system hardening. The report from lynis shows a lot of suggestions to harden … Continue reading

The post Auditing Linux system security using lynis appeared first on Experiencing Technology.

]]>
Apache document root in users home directory with SELinux https://blog.tinned-software.net/apache-document-root-in-users-home-directory-with-selinux/ Mon, 11 Dec 2017 14:37:40 +0000 https://blog.tinned-software.net/?p=2525 Serving web-content from a user’s home directory allows the user to conveniently upload files. By default, the apache configuration in many Linux distributions assumes content is uploaded to a single directory owned by the webserver’s user, but it might be … Continue reading

The post Apache document root in users home directory with SELinux appeared first on Experiencing Technology.

]]>
Align a partition on a hard disk https://blog.tinned-software.net/align-a-partition-on-a-hard-disk/ Mon, 13 Nov 2017 10:26:10 +0000 https://blog.tinned-software.net/?p=2402 New disks need to be prepared for use. When using a hardware raid like explained in Create hardware raid on HP via hpacucli some partitioning tools even show an error message. To prepare a disk for use, the disk needs … Continue reading

The post Align a partition on a hard disk appeared first on Experiencing Technology.

]]>
Rescue Data from corrupt SD card https://blog.tinned-software.net/rescue-data-from-corrupt-sd-card/ Mon, 23 Oct 2017 21:40:54 +0000 https://blog.tinned-software.net/?p=2460 SD cards are used in a variety of devices like digital cameras. Many times SD cards get removed from the devices, connected to a PC and reconnected back to the device. At some point, the SD card might be removed … Continue reading

The post Rescue Data from corrupt SD card appeared first on Experiencing Technology.

]]>
Mount raw image of entire disc https://blog.tinned-software.net/mount-raw-image-of-entire-disc/ Mon, 02 Oct 2017 08:46:06 +0000 https://blog.tinned-software.net/?p=2455 Raw disc images are very common, they include things like images created using dd for backups and virtual machine disk images. To access the disc image content means the disk image needs to be mounted. Images from a partition can … Continue reading

The post Mount raw image of entire disc appeared first on Experiencing Technology.

]]>
Testing environment setup using Vagrant https://blog.tinned-software.net/testing-environment-setup-using-vagrant/ Mon, 11 Sep 2017 19:37:48 +0000 https://blog.tinned-software.net/?p=2449 Setting up a test environment with many different operating systems and versions can be a time consuming task. Installing the different operating systems and configuring them for tests or development can take up a lot of time. Vagrant makes this … Continue reading

The post Testing environment setup using Vagrant appeared first on Experiencing Technology.

]]>
Create hardware raid on HP via hpacucli https://blog.tinned-software.net/create-hardware-raid-on-hp-via-hpacucli/ Mon, 21 Aug 2017 21:30:09 +0000 https://blog.tinned-software.net/?p=2392 Configuring a new hardware raid on a HP server can be done comfortably from the Linux command line without restarting the server. HP provides a small command line tool for this job. The following shows how this tool can be … Continue reading

The post Create hardware raid on HP via hpacucli appeared first on Experiencing Technology.

]]>
Linux Mint – Mount an NFS share automatically https://blog.tinned-software.net/linux-mint-mount-an-nfs-share-automatically/ Mon, 31 Jul 2017 08:47:32 +0000 https://blog.tinned-software.net/?p=2442 Linux Mint comes pre-installed with all components to mount Windows File sharing (SMB/CIFS) but does not support NFS out of the box. The following post will explain how to enable Linux Mint to mount a NFS share. Additionally the NFS … Continue reading

The post Linux Mint – Mount an NFS share automatically appeared first on Experiencing Technology.

]]>
Create GnuPG key with sub-keys to sign, encrypt, authenticate https://blog.tinned-software.net/create-gnupg-key-with-sub-keys-to-sign-encrypt-authenticate/ Mon, 10 Jul 2017 08:47:13 +0000 https://blog.tinned-software.net/?p=2385 In order to use a GnuPG key on a smartcard or Yubikey, a GnuPG key needs to be created. This post will show you how to create a GnuPG key with sub-keys for signing, encryption and authentication. The authentication key can … Continue reading

The post Create GnuPG key with sub-keys to sign, encrypt, authenticate appeared first on Experiencing Technology.

]]>
apt – install the package that contains a specific file https://blog.tinned-software.net/apt-install-the-package-that-contains-a-specific-file/ Mon, 19 Jun 2017 11:29:30 +0000 https://blog.tinned-software.net/?p=2372 Sometimes a command that you execute complains about a dependency being missing on the system. From the file name in the error message it is often not possible to know exactly which package needs to be installed to resolve the … Continue reading

The post apt – install the package that contains a specific file appeared first on Experiencing Technology.

]]>
Understand the basics of rrdtool to create a simple graph https://blog.tinned-software.net/understand-the-basics-of-rrdtool-to-create-a-simple-graph/ Tue, 30 May 2017 18:21:44 +0000 https://blog.tinned-software.net/?p=2333 rrdtool is a powerful tool to store time series data and create graphs. It is very easy to create your first simple graph. This how-to will show the quickest way to generating your first graphs while explaining the options used. rrdtool is used in … Continue reading

The post Understand the basics of rrdtool to create a simple graph appeared first on Experiencing Technology.

]]>
Increase the size of a LUKS encrypted partition https://blog.tinned-software.net/increase-the-size-of-a-luks-encrypted-partition/ Mon, 08 May 2017 16:24:45 +0000 https://blog.tinned-software.net/?p=2431 Even encrypted discs or partitions sometimes need to have their size increased. A LUKS encrypted volume consists of different layers which all need to be resized. To resize an encrypted volume, multiple steps have to be performed to use the additional … Continue reading

The post Increase the size of a LUKS encrypted partition appeared first on Experiencing Technology.

]]>
Update to PHP 5.6 on CentOS 6 using remi repository https://blog.tinned-software.net/update-to-php-5-6-on-centos-6-using-remi-repository/ Mon, 17 Apr 2017 08:00:15 +0000 https://blog.tinned-software.net/?p=2256 With CentOS being a conservative distribution, security patches are still applied to CentOS 6, but no new versions are available. When running some websites – like Virtualmin – on CentOS 6, the old PHP version 5.3.3 can cause problems. Updating to a newer … Continue reading

The post Update to PHP 5.6 on CentOS 6 using remi repository appeared first on Experiencing Technology.

]]>
Permanently reject a specific email sender address using postfix https://blog.tinned-software.net/permanently-reject-a-specific-email-sender-address-using-postfix/ Mon, 27 Mar 2017 18:26:09 +0000 https://blog.tinned-software.net/?p=2295 Postfix generally accepts all sender addresses. It might be needed in some rare cases to reject one sender addresses for some reason. With postfix, there is the possibility to use the “check_sender_access” to set individual actions per sender address. For the … Continue reading

The post Permanently reject a specific email sender address using postfix appeared first on Experiencing Technology.

]]>
Certificate Transparency and unauthorized certificates https://blog.tinned-software.net/certificate-transparency-and-unauthorized-certificates/ https://blog.tinned-software.net/certificate-transparency-and-unauthorized-certificates/#comments Mon, 06 Mar 2017 09:47:09 +0000 https://blog.tinned-software.net/?p=2379 I own a domain which was bought a few months back which is managed by CloudFlare's service in DNS-only mode. As I intended to only use CloudFlare's DNS service, I disabled every option except the DNS related features. You can imagin the surprise to see certificates issued for my domain without my knowledge. Continue reading

The post Certificate Transparency and unauthorized certificates appeared first on Experiencing Technology.

]]>
https://blog.tinned-software.net/certificate-transparency-and-unauthorized-certificates/feed/ 1
How to get scrollbar arrows in Linux Mint 17 https://blog.tinned-software.net/how-to-get-scrollbar-arrows-in-linux-mint-17/ Mon, 13 Feb 2017 09:11:12 +0000 https://blog.tinned-software.net/?p=2325 Linux Mint is missing the scrollbar arrow buttons at the end of the scrollbars. There are situations in which those buttons can be very useful. This how-to will explain how to get them back. Sadly I could not find any … Continue reading

The post How to get scrollbar arrows in Linux Mint 17 appeared first on Experiencing Technology.

]]>
Verifying SSH configuration with a scan https://blog.tinned-software.net/verifying-ssh-configuration-with-a-scan/ Mon, 23 Jan 2017 10:20:04 +0000 https://blog.tinned-software.net/?p=2281 Managing a number of Linux servers and keeping them secure can be a challenge. Certain tools can make the life of an admin a lot easier. To ensure an ssh daemon complies with a desired security configuration the admin can use a scanner … Continue reading

The post Verifying SSH configuration with a scan appeared first on Experiencing Technology.

]]>
Debug SSH Connection issue in key exchange https://blog.tinned-software.net/debug-ssh-connection-issue-in-key-exchange/ Mon, 02 Jan 2017 09:41:21 +0000 https://blog.tinned-software.net/?p=2284 Securing a server means hardening the SSH server settings, but doing so can also cause issues with ssh clients. Finding the cipher or algorithm causing a failled connection can be tricky. Depending on the client used, the error message might be very … Continue reading

The post Debug SSH Connection issue in key exchange appeared first on Experiencing Technology.

]]>
Automount a luks encrypted volume on system start https://blog.tinned-software.net/automount-a-luks-encrypted-volume-on-system-start/ Mon, 12 Dec 2016 07:21:58 +0000 https://blog.tinned-software.net/?p=2273 Linux supports encrypted volumes with luks. When a luks encrypted volume is set up during installation to be booted from, the volume is already configured and set up. When an encrypted volume is set up afterwards, the volume remains locked until … Continue reading

The post Automount a luks encrypted volume on system start appeared first on Experiencing Technology.

]]>