Troubleshoot Fencing on Redhat or Centos Linux We are setting up fencing for Enterprise Customers for Openstack. In Linux fencing is called for whenever you have a cluster. Using PCS and fencing the other servers can turn off a damaged server until it is fixed. Pay attention that mac address is the provision nic However, …
Windows 10 Pro Install Issues – Installs Home instead of Pro.
last year I got stuck simply installing my PC with Windows 10 Pro from OEM envelope. I had downloaded the installation iso. Every time I installed it insisted on putting only the home version. IN order to get it to work, you need to add the file pid.txt to the sources dir on the ISO …
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I’ve had a mild curiosity about Docker’s silly container names
Here is the source file that is used to create docker’s silly container names. Source: moby/names-generator.go at master · moby/moby The left side has an adjective like “affectionate”, “agitated”, “amazing”, “angry”, “awesome”, “beautiful”, “blissful”, “bold”, “boring”, “brave”, “busy”, The right side show ignorance of special people as it is based on names from notable scientists …
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Bash Script that installs curl gets stuck asking to restart services
Automation is often a lot of work, even just installing curl Ubuntu is a social creature and does not like to be automated as much as you might expect. Very often your automation gets stuck because all of a sudden the folks at Canonical decided that they prefer human interaction. Often Ansible just hangs! For …
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How to password reset Windows Server 2016 AWS EC2 ?
Prepare your own windows 2016 AMI with a random password for the new copy If you would like to prepare an AMI for yourself with a new password or for the marketplace Run: C:\ProgramData\Amazon\EC2-Windows\Launch\Scripts\InitializeInstance.ps1 –Schedule This tells the rebooted or new instance to produce new password that will be properly encrypted so you can get …
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Dovecot installation and configuration on CentOS
This is missing postfix config of mailbox dir, let see what else ? Recommended is to use the directory format to store email rather than the the older mbox format. The Maildir format is well supported by Dovecot and has some advantages (no locking, allows for easy incremental back-ups and restoring of individual messages.) So …
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How to set up LACP bonding interface on CentOS 7 | Snel.com
I am installing multiple systems with Linux Bonding and LACP mode 4 which uses IEEE 802.3ad Link Aggregation Policy. In the mean time I am looking at 2 links, as we are using Red Hat 6.9 https://developer.rackspace.com/blog/lacp-bonding-and-linux-configuration/ as well as the following: LACP bonding network interface setup A bonding network interface could be used for …
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Introspection of baremetal nodes fails with ‘No hypervisor matching’ when node name used instead of uuid
Introspection fails due to use of Host Name instead of UUID When I do introspection on baremetal servers that will be used as for Redhat TripleO Openstack 13 (This is the same as RDO Queens) I start with just one. Before this I import the instackenv.json file with all of the baremetal server details using: …
Managing port level security in OpenStack
I am investigating why dpdk doesn’t work inside an instance. The OpenStack platform, specifically Neutron (the networking component), uses the concepts of “ports” in order to connect the various cloud instances to different networks and the corresponding virtual networking devices like Neutron routers, firewalls etc. The default security on these ports is quite restrictive (and rightly …
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Running the AWS CLI and Python on Windows 10 in a Linux Bash shell – 4sysops
Enable the Windows Subsystem for Linux ^ Before we start anything and install the Linux distribution package for WSL, make sure you enable the “Windows Subsystem for Linux” optional feature on your machine. Running the following command from your PowerShell console will enable this feature. Open PowerShell as an administrator and run: 1 Enable-WindowsOptionalFeature -Online -FeatureName …
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How to set a root password for your Openstack images
Login via console to your failed openstack deployment This is a copy of a blog that I wrote where I work at Octopus Computer Solutions While installing Redhat Openstack on Baremetal with lots of complicated networking, you might need to access Linux via the console. Redhat images do not come with a default username and …
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Doctors Are Losing #Faith in IBM #Watson’s #AI. But does predict breakfast choice.
Have you been feeling like Ai apps respond like 5 year olds? Medicine is based on statistics not theory. after eight years of waiting with little in the way of results, several doctors told IEEE Spectrum that they’re getting fed up — bad news for IBM, but also a potential inflection point for the AI …
6 Effective Tips for Blocking Email Spam with Postfix SMTP Server
Not so charming, mega spam! Tip #6: Using Public Anti-Spam Blacklists There are spam emails that are sent from servers that has a valid hostname, valid PTR record and can pass through grey listing. In this case, you can use blacklisting to reject spam. There are many public anti-spam blacklists online. You can use multiple …
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