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  • SLE 15 Unified Installer - is less actually more?

    calendar Oct 8, 2019 · 5 min read · sles  ·
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    SUSE Linux Enterprise Server 15 (SLES) not only introduced new software packages - another big update was making those packages more modular. In comparison to predecessor releases, SLES has a generic installation media for the first time. Earlier versions had dedicated images for products such as SLES for SAP or SUSE …
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  • Short tip: Clone Git repository via SSH and SOCKS proxy

    calendar Aug 13, 2019 · 1 min read · gitlab kurztipp  ·
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    When using tools such as GitLab can cloned via HTTP and SSH. Especially the second choice can be handy if there is no VPN available - but keep in mind, also sending DNS via the jumphost.

    The first step is establishing a SSH connection leveraging port forwarding:

    1$ ssh -A -D 1337 USER@IP -i pinkepank.key
    

    Afterwards, …


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  • Short tip: Utilize Ansible role via Vagrant

    calendar Jul 16, 2019 · 1 min read · ansible kurztipp vagrant  ·
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    When implementing larger tasks in Ansible, you might thinking about writing your own Ansible role sooner or later. For this, the ansible-galaxy command can help you:

    1$ ansible-galaxy init my-role
    2- my-role was created successfully
    

    Beside handlers, variables and meta data, also a test task is created. Using this task, …


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  • Short tip: Ansible - "failed to create temporary content file: 'The read operation timed out'"

    calendar Jun 17, 2019 · 1 min read · ansible kurztipp  ·
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    While using the Ansible modules get_url and unarchive I recently stumbled upon the following errors:

    1failed to create temporary content file: 'The read operation timed out'
    2failed to create temporary content file: (-1, 'Unexpected EOF')
    

    After some research it figured out that the urllib3 library ( …


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  • Test-driven development with Chef and Vagrant

    calendar Oct 19, 2018 · 16 min read · chef devops inspec vagrant  ·
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    When it is planned to automate deploying and configuring complex insfrastructure setups, Chef is a mighty tool. Focussing the Infrastructure as Code (IaC) manifesto, it offers more than conventional Configuration Management and can be used to replace manual tasks with faster, repeatable and measurable automatisms. When …
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  • Short tip: Python TypeError: init() takes exactly 2 arguments (4 given)

    calendar Oct 6, 2018 · 1 min read · kurztipp  ·
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    Recently, I stumbled upon the following issue while installing a Python utility on an older CentOS system:

     1# python setup.py install
     2Traceback (most recent call last):
     3  File "setup.py", line 102, in
     4    'katprep_snapshot=katprep.snapshot:cli',
     5  File …

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  • Short tip: Puppet - 'Unable to fetch my node definition, but the agent run will continue'

    calendar Sep 25, 2018 · 1 min read · puppet kurztipp  ·
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    Doing a recent Puppet agent upgrade from version 3.x to 4.x I stumbled upon the following errors:

    1Puppet (warning): Unable to fetch my node definition, but the agent run will continue:
    2Puppet (warning): Could not find terminus rest for indirection node
    3/File[/var/lib/puppet/lib] (err): Failed to generate additional …

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  • Short tip: Install missing SNMP MIBs under Debian Linux

    calendar Aug 28, 2018 · 2 min read · debian kurztipp  ·
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    Leveraging SNMP is often a pain when appropriate MIB files (Management Information Base) are missing - e.g. because the manufacturer did not document them or only offer them at fee. When utilizing a Perl program recently, I stumbled upon the following issue:

    Cannot find module (SNMPv2-SMI):

    After ensuring that missing …


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  • Puppet agents force dozens of errors: "Could not set 'file' on ensure: incorrect header check"

    calendar Jun 23, 2018 · 2 min read · katello puppet red-hat-satellite-6  ·
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    Recently I had the problem that my homelab's Linux machines managed by Puppet were generating dozens of error messages when updating the catalog:

    1# puppet agent --test
    2Error: /File[/var/lib/puppet/lib/puppet/parser/functions/load_module_metadata.rb]/ensure: change from absent to file failed: Could not set …

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  • Short tip: Manage cloned systems with SUSE Manager

    calendar May 22, 2018 · 1 min read · salt kurztipp  ·
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    It is a common procedure to use templates ("golden images") when deploying virtual machines. Recently I had an issue when deploying SLES machines - newly registered systems within SUSE Manager replaced older one. The management agent was installed within the template.

    For classic systems (registered via RHNSD …


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Christian Stankowic photo

Christian Stankowic

Virtualization, Linux and IaC
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