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I just gave someone the advice without being asked (ignoring all i know about „nonviolent communication“ – sorry for that!) to include a „Scope“ in his blog: he wrote an article how to setup a Raspberry-Pi but skipped all security considerations about how to setup a productive computer system. I assume many readers of his blog don’t have a clue how to harden a linux-operated Raspberry-Pi. I assume: those readers need at least a hint: „there are additional steps required“ or even better, concrete advice: „what to do next“ – maybe in a follow-up article. How many people are part of a bot-net since the’veRead More →

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When deploying Virtual-Machines by OVF/OVA-Files in automated manner, eg. using PowerShell of Terraform, it’s crucial to set all individual deployment parameters using the provisioning system. Discover the available Properties using PowerShell OFV-Tool Using PowerShell Create a vCenter-Connection Retrieve the OVF-Config-Object Display all contained Properties („=Keys“) Deployment-Option? Using OVF-Tool OVFTOOL.EXE, provided by VMware (Download OVFTOOL) allows to inspect existing OVA/OFV-Files, too.Read More →

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Of course, every release of an linux-distribution has to change the way very basic network settings are configured. 😉 Ubuntu 20.04 Server LTS to be fair: „netplan“ has been in place since at least release 17.10 the „subiquity“-tool which has written the yaml-file has been confusing me… Step 1: Figure out – which IP/DNS-Settings where set by DHCP Step 2: Disable (if required) automation tools – here „subiquity“ This is YAML: Optional: Try a temporarily YAML-File before Apply safeguard if you are using a ssh-connection Roll back, after a Timeout Step 3: Edit/Apply NetPlan Config ApplyRead More →

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This is a really nice feature – the Azure Pricing REST-API: https://docs.microsoft.com/en-us/rest/api/cost-management/retail-prices/azure-retail-prices It pulls a structured JSON-Dataset for (not only) Virtual Machines out of the Azure-Webshop. For example – the following filter: https://prices.azure.com/api/retail/prices?$filter=serviceName eq ‚Virtual Machines‘ and priceType eq ‚Consumption‘ and endswith(armRegionName, ‚europe‘) and (startswith(skuName, ‚D‘) or startswith(skuName, ‚E‘) or startswith(skuName, ‚F‘) or startswith(skuName, ‚M‘)) and endswith(skuName,‘ Spot‘) displays the price for only „VMs“ with specific properties: no Reservation in „.*europe“-Locations with Types „D.*“ or „E.*“ or „F.*“ or „M.*“ Spot-Intances but – if you don’t want „Spot“ Instances, you’d guess this filter-Statement: https://prices.azure.com/api/retail/prices?$filter=serviceName eq ‚Virtual Machines‘ and priceType eq ‚Consumption‘ and endswith(armRegionName, ‚europe‘) andRead More →

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Go to https://docs.microsoft.com/en-us/azure/virtual-machines/acu and look for: ***Hyper-threaded and capable of running nested virtualization The following „script“ pulls the SKUs out of the table: wget -O – –no-check-certificate https://docs.microsoft.com/en-us/azure/virtual-machines/acu | egrep -B2 „\*\*\*“ | egrep „data-linktype“ | sed -E „s/^.+relative-path..([^\<]+).+$/SKU: \1/g“ C:\RH>echo „Hyper-threaded and capable of running nested virtualization“ && wget -q -O – –no-check-certificate https://docs.microsoft.com/en-us/azure/virtual-machines/acu | egrep -B2 „\*\*\*“ | egrep „data-linktype“ | sed -E „s/^.+relative-path..([^\<]+).+$/SKU: \1/g““Hyper-threaded and capable of running nested virtualization“SKU: D_v3SKU: Ds_v3SKU: Dv4SKU: Dsv4SKU: Ddv4SKU: Ddsv4SKU: E_v3SKU: Es_v3SKU: Ev4SKU: Esv4SKU: Edv4SKU: Edsv4SKU: F2s_v2 – F72s_v2SKU: M Next Step? Finding one with enough memory for an acceptable price.Read More →

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Preparation C:\> pip install pyangCollecting pyangDownloading https://files.pythonhosted.org/packages/5e/b4/4f1937f18914b847168ea596b77e04d75d28ff937ecc4ac7da210b17ad78/pyang-2.1.1-py2.py3-none-any.whl (572kB)100% |████████████████████████████████| 573kB 3.6MB/sCollecting lxml (from pyang)Downloading https://files.pythonhosted.org/packages/aa/17/b9ccbdd50f66258d362561dbfe3cf4aaa60c82c4bba0302b3f52ab730b99/lxml-4.4.2-cp37-cp37m-win_amd64.whl (3.7MB)100% |████████████████████████████████| 3.7MB 5.2MB/sInstalling collected packages: lxml, pyangSuccessfully installed lxml-4.4.2 pyang-2.1.1You are using pip version 10.0.1, however version 20.0.1 is available.You should consider upgrading via the ‚python -m pip install –upgrade pip‘ command. C:\> python -m pip install –upgrade pipCollecting pipDownloading https://files.pythonhosted.org/packages/57/36/67f809c135c17ec9b8276466cc57f35b98c240f55c780689ea29fa32f512/pip-20.0.1-py2.py3-none-any.whl (1.5MB)100% |████████████████████████████████| 1.5MB 7.0MB/sInstalling collected packages: pipFound existing installation: pip 10.0.1Uninstalling pip-10.0.1:Successfully uninstalled pip-10.0.1Successfully installed pip-20.0.1 C:\cd labC:\LAB>cd GIT C:\LAB\GIT> git clone https://github.com/YangModels/yang.gitCloning into ‚yang’…remote: Enumerating objects: 19, done.remote: Counting objects: 100% (19/19), done.remote: Compressing objects: 100% (16/16), done.remote: Total 30728 (delta 6), reused 12 (delta 3), pack-reusedRead More →

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The default-MTU allows max. 1472-byte sized ping-packets to be sent (28 Bytes will always get added: 20 Byte IPv4-Header, 8 Byte ICMP-Header). If you want to test the max. MTU of the LAN, you have to modify the IP-MTU of the Windows-NIC. List all Interfaces C:\>netsh interface ipv4 show interfaces Idx Met MTU State Name— ———- ———- ———— —————————1 75 4294967295 connected Loopback Pseudo-Interface 127 55 1500 disconnected WLAN12 25 1500 disconnected Local Area Connection* 98 25 1500 disconnected Local Area Connection* 104 5 1500 disconnected ETH_DELL23 25 1500 connected VirtualBox_Host313 25 1500 connected ETH_DOCK24 25 1500 connected VirtualBox_Host111 25 1500 connected VirtualBox_Host29 25 1500Read More →