Sysadmin(118)

• OpenVPN: updating /etc/resolv.conf (26 Dec 2019 | Tags: Linux, Programming, Sysadmin, Bash, openssl, Security, Tricks, Downloads)
• HackADay: A Christmas-Machine(Merry Christmas) (21 Dec 2019 | Tags: Linux, Fun, Programming, Sysadmin, xmas, HackADay, Raspberry, Debian)
• FreeRadius: Privilege Escalation via Logrotate (02 Dec 2019 | Tags: Programming, Sysadmin, C, Security, CVE, logrotate)
• CVE-2019-15741: Privilege Escalation via Logrotate in Gitlab Omnibus (04 Oct 2019 | Tags: Linux, Programming, Sysadmin, Security, git, CVE, logrotate)
• Privilege escalation in groonga-httpd (CVE-2019-11675) (07 May 2019 | Tags: Linux, Programming, Sysadmin, C, Security, Debian, CVE, logrotate)
• Details of a logrotate race-condition (01 May 2019 | Tags: Linux, Programming, Sysadmin, C, Security, logrotate)
• Abusing a race condition in logrotate to elevate privileges (14 Jan 2019 | Tags: Programming, Sysadmin, C, Security, logrotate)
• Full Disclosure: Remote-Command-Execution in PHKP (08 Oct 2018 | Tags: Programming, Sysadmin, Security, CVE)
• Happy Sysadminday (27 Jul 2018 | Tags: Sysadmin, News)
• Now is a good time to backup our github-repos (07 Jun 2018 | Tags: Linux, Sysadmin, Tricks, git, Backup, Ruby, Shell, Open-Source)
• Postfix: verified TLS with DANE (14 May 2018 | Tags: Linux, Mail, Sysadmin, Security, Email, Crypto)
• Thoughts about DNSsec (08 May 2018 | Tags: Sysadmin, Security, Crypto, Network)
• What if dnsmasq and ubound marry? (11 Apr 2018 | Tags: Linux, Sysadmin, Network)
• Managing MaraDNS with Ansible (28 Aug 2017 | Tags: Linux, Programming, Sysadmin, Downloads, Ansible)
• check_mk-rbl - A check_mk-plugin that monitors public ipv4 addresses (20 Aug 2017 | Tags: Programming, Sysadmin, Downloads, Monitoring, Check_MK)
• Fixing "postscreen_cache.db: No such file or directory" (13 Feb 2017 | Tags: Mail, Sysadmin, Tricks, Email)
• Postgresql: Changing default template to UTF8 (12 Jan 2017 | Tags: Sysadmin, Tricks, Database, Postgresql)
• Debian Squidguard: update-squidguard does not work with tabs in config-file (18 Dec 2016 | Tags: Linux, Sysadmin, Debian)
• Mysql does not connect to a given port on localhost (07 Dec 2016 | Tags: Linux, Sysadmin, Tricks, Database)
• Testing ansible-roles automatically on every git-push (07 Dec 2016 | Tags: Linux, Programming, Sysadmin, Tricks, git, Ansible)
• How to migrate mysql-user/permissions (02 Nov 2016 | Tags: Sysadmin, Tricks, Database, Shell)
• How to find out the serial number of a specific disk (11 Oct 2016 | Tags: Linux, Sysadmin, Tricks, Shell)
• LXC: Problems with the ubuntu-template in Debian Jessie (29 Sep 2016 | Tags: Linux, Sysadmin, Tricks, Debian, Virtualization)
• Crashing systemd (29 Sep 2016 | Tags: Linux, Sysadmin, Systemd, External)
• GNU parallel (20 Aug 2016 | Tags: Linux, Programming, Sysadmin, Bash, One-Liner, Tricks)
• Speed up apt using apt-fast (05 Aug 2016 | Tags: Linux, Sysadmin, External)
• Happy Sysadmin-Day (29 Jul 2016 | Tags: Sysadmin)
• Using pushd/popd (23 Jul 2016 | Tags: Linux, Sysadmin, Bash, Tricks, Shell, Zsh)
• Linux: emergency reboot or shutdown with magic commands (08 Jul 2016 | Tags: Linux, Sysadmin, Tricks, External)
• Using ssh-keygen (08 Jul 2016 | Tags: Linux, Sysadmin, Security, Tricks, Shell)
• Installing cronjobs out of scripts (26 Jun 2016 | Tags: Linux, Sysadmin, Ruby, Shell)
• Perf - More than just counters (20 May 2016 | Tags: Linux, Sysadmin, Kernel, Shell)
• Duplicity: restore the state of a file from a specific date (19 May 2016 | Tags: Linux, Sysadmin, Tricks, Backup)
• Reading out BIOS-Information (02 May 2016 | Tags: Linux, Sysadmin)
• Setup LXC-Container in Debian Jessie (10 Apr 2016 | Tags: Linux, Sysadmin, Network, Virtualization)
• Shorewall: setup Geo-IP filtering (06 Apr 2016 | Tags: Linux, Sysadmin, Security, Network, Firewall, Toscom)
• BTRFS: Solving issues with copy-on-write (05 Apr 2016 | Tags: Linux, Sysadmin, Btrfs, Virtualization)
• Tcpdump: capturing ipv6-packets only (22 Mar 2016 | Tags: Linux, Sysadmin, Network)
• Snapper: Awesome Snapshot-Manager (11 Mar 2016 | Tags: Linux, Sysadmin, Tricks, LVM, Btrfs, Virtualization)
• LVM: Thin provisioned volumes (11 Mar 2016 | Tags: Linux, Sysadmin, LVM)
• Filetransfer using netcat (07 Mar 2016 | Tags: Linux, Sysadmin, Tricks, Network)
• Tcpdump: capturing packets with specific tcpflags (03 Mar 2016 | Tags: Linux, Sysadmin, Network)
• BTRFS: monitoring raid errors (16 Feb 2016 | Tags: Linux, Sysadmin, Btrfs)
• Guacamole: A clientless remote desktop gateway using HTML5 (15 Feb 2016 | Tags: Sysadmin, Network, Proxy, External)
• Static arp-cache on dhcp-servers (13 Feb 2016 | Tags: Linux, Sysadmin, Security, Tricks, Network)
• Route to nowhere - Blocking attackers using Nullroutes (04 Feb 2016 | Tags: Linux, Sysadmin, Security, Network, Firewall)
• Using the mouse-wheel to scroll in GNU screen (04 Feb 2016 | Tags: Linux, Sysadmin, Tricks, Shell)
• reptyr - A tool for "re-ptying" programs (03 Feb 2016 | Tags: Linux, Sysadmin, Bash, Tricks)
• Lets Encrypt (30 Jan 2016 | Tags: Mail, Sysadmin, Crypto, apache, Kolab)
• Phoning home - In a nice way (30 Jan 2016 | Tags: Sysadmin, Tricks, Network)
• Git: Using Git for building the Linux-Kernel from sources (19 Jan 2016 | Tags: Linux, Sysadmin, git, Kernel)
• SSH: transfer files indirectly using scp (15 Jan 2016 | Tags: Linux, Sysadmin, Tricks, ssh)
• amavisd-new: .docx often incorrectly detected as BANNED: .exe, .exe-ms, [trash]/0000.dat (15 Jan 2016 | Tags: Linux, Sysadmin, Anti-Spam)
• Check /etc/shadow for accounts with empty passwords (11 Jan 2016 | Tags: Linux, Sysadmin, Security, Tricks)
• What if logrotate does not rotate files.. (11 Jan 2016 | Tags: Linux, Sysadmin, logrotate)
• List the last shutdown(s) of a server (21 Dec 2015 | Tags: Linux, Sysadmin, Tricks, Kernel, Shell)
• Kernel: boost your harddisk performance with an additional ssd-drive (11 Nov 2015 | Tags: Linux, Sysadmin, Tricks, Kernel, External, Storage)
• Qemu: Resizing qcow2-images (11 Nov 2015 | Tags: Linux, Sysadmin, Tricks, KVM, Qemu, Virtualization)
• Crontab-Guru (28 Oct 2015 | Tags: Linux, Sysadmin, External, Cron)
• The Rule Of Three (Part2) (25 Oct 2015 | Tags: Linux, Sysadmin, Bash, RuleOfThree, urxvt, TerminalEmulator, Shell, Zsh)
• The Rule Of Three (Part 1) (28 Sep 2015 | Tags: Linux, Sysadmin, RuleOfThree, urxvt, TerminalEmulator, Shell)
• Nagios: cleaning up nagios-logs (24 Sep 2015 | Tags: Linux, Nagios, Sysadmin, Tricks)
• facts2dw (24 Sep 2015 | Tags: Programming, Sysadmin, Puppet, Ruby, Downloads, Ansible)
• git: keeping track of configurations with etckeeper (23 Sep 2015 | Tags: Linux, Sysadmin, Tricks, git)
• Firewall Evasion-Techniques (18 Sep 2015 | Tags: Linux, Sysadmin, Security, Firewall)
• Finding informations about built-in kernel-modules (18 Sep 2015 | Tags: Linux, Sysadmin, Kernel)
• Kolab 3.2 on debian jessie: filters dont work (18 Sep 2015 | Tags: Linux, Mail, Sysadmin, Email, Kolab)
• OpenSSL: Generating a Subject-Alternative-Names-Certificate (18 Sep 2015 | Tags: Sysadmin, openssl, Crypto)
• Ruby: Managing multiple ruby-versions for a single user (12 Sep 2015 | Tags: Programming, Sysadmin, Ruby)
• SSH: Creating a reverse tunnel (11 Sep 2015 | Tags: Linux, Sysadmin, Tricks, Network, ssh)
• Btrfs: Turning a mdadm-array into a btrfs (30 Aug 2015 | Tags: Linux, Sysadmin, Software-Raid, Filesystem, Btrfs)
• Desktop-Notifications using libnotify (30 Aug 2015 | Tags: Linux, Programming, Sysadmin, Desktop)
• Automate the boring stuff with python (01 Jul 2015 | Tags: Linux, Programming, Sysadmin, Python)
• Bup: A git-based backup-system (30 Jun 2015 | Tags: Linux, Sysadmin, git, Backup)
• Sophos Virus-Scan is now free (30 Jun 2015 | Tags: Linux, Sysadmin, Security, Virus)
• postgresql: using auto-incrementing keys (21 Jun 2015 | Tags: Sysadmin, Database, Postgresql)
• postgresql: install and activate crypto-functions (18 Jun 2015 | Tags: Sysadmin, Database, Postgresql)
• Debian Jessie: nrpe without command-args (28 May 2015 | Tags: Linux, Nagios, Sysadmin, Debian, Security)
• Reverse-Proxy for Exchange 2003 (26 May 2015 | Tags: Linux, Sysadmin, Microsoft, Proxy, haproxy)
• Opportunistic Locking (26 May 2015 | Tags: Linux, Sysadmin)
• Logjam ( Attacks against Diffie-Hellman) (21 May 2015 | Tags: Sysadmin, Crypto, Security)
• Puppet4: First Impressions (16 May 2015 | Tags: Linux, Sysadmin, Puppet)
• 10 Amazing and Mysterious Uses of (!) Symbol or Operator in Linux Commands (16 May 2015 | Tags: Linux, Sysadmin, Bash)
• Debian Jessie: Issues to be aware of (03 May 2015 | Tags: Linux, Sysadmin, Debian)
• Apache2: Upgrading from 2.2 to 2.4 (03 May 2015 | Tags: Sysadmin, apache, Debian)
• postgresql: cheat-sheet (30 Apr 2015 | Tags: Sysadmin, Database, Postgresql)
• Debian Jessie: First impressions (28 Apr 2015 | Tags: Linux, Sysadmin, Debian)
• Nice little script for importing cacert.org-certificates in debian/ubuntu (28 Apr 2015 | Tags: Linux, Sysadmin, Crypto)
• puppetdb: unable to get local issuer certificate.. (27 Apr 2015 | Tags: Linux, Sysadmin, Puppet)
• Debian 8.0 Jessie has been released (27 Apr 2015 | Tags: Linux, Sysadmin, Debian)
• Finally my USB-Armory arrived (10 Apr 2015 | Tags: Linux, Sysadmin)
• mdadm: resync=pending (08 Apr 2015 | Tags: Linux, Sysadmin, Software-Raid)
• mdadm: throttling the resync activity (25 Mar 2015 | Tags: Linux, Sysadmin, Software-Raid)
• Software-Raid Fork (23 Mar 2015 | Tags: Linux, Sysadmin, Software-Raid, LVM)
• OpenLDAP: Set config admin password (12 Mar 2015 | Tags: Linux, Sysadmin, OpenLDAP)
• Puppet: Have a look at puppetboard (05 Mar 2015 | Tags: Linux, Sysadmin, Puppet)
• Auto-restart Linux-Sytem after a Kernel-Panic (20 Feb 2015 | Tags: Linux, Sysadmin, Tricks, Kernel)
• Path MTU Discovery (18 Feb 2015 | Tags: Linux, Sysadmin, Network)
• sed: Schedule a job which comments out specific lines in a file (16 Feb 2015 | Tags: Linux, Sysadmin, Tricks, sed)
• Owncloud: doing admin-tasks with console.php (16 Feb 2015 | Tags: Linux, Sysadmin, Owncloud)
• Hack A Day: Lets make a Mail2SMS-Gateway using the Raspberry Pi (06 Feb 2015 | Tags: Linux, Sysadmin, HackADay, Raspberry)
• How to find out IP-Ranges of, lets say Facebook.. (28 Jan 2015 | Tags: Linux, Sysadmin, Network)
• POODLE Disabling SSLv3 Support on Servers (13 Jan 2015 | Tags: Linux, Sysadmin, Crypto)
• Nice article about hardening ssh-encryption.. (13 Jan 2015 | Tags: Linux, Sysadmin, Crypto)
• Exclude DNS-Blacklist AHBL from spamassassin (13 Jan 2015 | Tags: Linux, Sysadmin, Email, Anti-Spam)
• Find out the differences between to directories (04 Jan 2015 | Tags: Linux, Sysadmin, Bash, One-Liner, git)
• Recovering deleted files using grep (04 Jan 2015 | Tags: Linux, Sysadmin, One-Liner, Tricks)
• Delete all mails in mutt (22 Dec 2014 | Tags: Linux, Sysadmin, One-Liner, mutt)
• A nice way to get disk usage statistics (19 Dec 2014 | Tags: Linux, Sysadmin, Tricks)
• check-script for zonetransfers (16 Dec 2014 | Tags: Sysadmin, One-Liner, Security)
• Copy the partition table from one disk to another (16 Dec 2014 | Tags: Linux, Sysadmin, Partitioning)
• Useful OpenSSL Commands (16 Dec 2014 | Tags: Linux, Sysadmin, One-Liner, openssl, Crypto)
• Owncloud7: Convert Database from SQLite to Mysql (27 Nov 2014 | Tags: Linux, Sysadmin, Owncloud)
• ZFS: zpool doesnt get imported automatically after reboot (26 Nov 2014 | Tags: Linux, Sysadmin, ZFS)
• List disk-usage of files and directories (24 Nov 2014 | Tags: Linux, Sysadmin, Bash, One-Liner)
• Docker (22 Nov 2014 | Tags: Linux, Sysadmin, Docker, Drupal)
• "Never change a running system" (21 Nov 2014 | Tags: Sysadmin)
• Half-Automatic Update-Script(apt) (12 Nov 2014 | Tags: Linux, Programming, Sysadmin, Bash, Perl)