Translations: "Deutsch" |
about
As I started 2013 my training as IT specialist for system integration, I already acquired some experience with computer, Linux (Ubuntu) and programming (C and C++).
During my apprenticeship, I joined the server department and, together with other colleagues, was responsible for about 350 Linux server. Here I learned a lot about Linux and services, monitoring, automation (Puppet 4), hardening (OS + application level hardening) and user management.
I currently still earn my money as a Linux system administrator for a major customer in the financial industry. Here I install, support, automate, maintain, operate and harden about 1000 Linux servers (RHEL and SLES) with my colleagues.
At home I like to look at interesting projects on Github, script and program my own small tools, tinker with my server or do something like this website.
What I work with (almost) every day with a self-assessment (1=less, 6=professional):
| Technic | Expertise | Description |
|---|---|---|
| RedHat | 6 | RedHat based operating systems including e.g. RedHat 5 to RedHat 8, OracleLinux, CentOS (pre CentOS Stream) |
| SUSE | 5 | SLES 11 SP4, SLES 12 SP2 to SP5 (SAP and nonSAP) |
| Puppet | 4 | Puppet 4, Puppet 6, debugging hiera and Puppet modules |
| Ansible | 4 | Enough knowledge to make sense of playbooks and roles, though Jinja2 templates sometimes take me a little longer to create 😅 |
| Collectd | 3 | Once automate the configuration via Puppet and then it will run for a few years without being touched |
| OS Hardening | 4-5 | Once define all possible OS hardening topics + roll out (via Puppet) automated, e.g. ssh + sshd configs, cryptopolicies, permission management |
| rsyslog | 3 | good enough for rough debugging (e.g. RELP encrypted syslog forwarding), but writing own rules will be difficult(er) |
| VMware (VCenter) | 5 | I myself am rather a user (not an admin) of the VMware environment |
| Icinga2 (NRPE Client) | 4 | Automation also does a lot of work for us (e.g. configuration of new nrpe monitoring checks, adding checks / systems to monitoring) |
| Netzwerk | 5 | Source and destination NAT, firewalls (theoretical knowledge, no firewalls configured), debugging with netstat/ss and tcpdump |
| Git | 5 | I understand Git well enough to be able to solve almost all problems without Google |
| ITIL | 5 | Our workflow is based on ITIL guidelines according to some ISO standard |
| Python | 4 | Creating small scripts wont be a problem, but may take a little longer than a developer |
| Bash | 5 | Fastly creating scripts with getops, functions and a little bit magic |
| Certifications | Date | Description |
|---|---|---|
| RedHat Certified System Administrator (RHCSA) | 15.03.2021 | RHCSA with RHEL 8 |
| RedHat Certified Engineer (RHCE) | 31.05.2022 | RHCE with RHEL 8 |