Devops Blog – Openstack, Openshift,- Docker, Kubernetes, Swarm, Linux, Windows Stacks – Mongodb, An occasional opinion
Hits: 6955Not 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 …
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Hits: 566Openstack sets your hostname with cloud init on each boot. When you create the instance, you should assign it a name with full FQDN. This is absolutely required by Openshift. I did the following: Check out the Original of this article from my blog at work: Octopus Computer Solutions Hostnames and FQDN are …
Hits: 2847Setup disconnected Docker registry for Rhosp Setup disconnected Docker registry for Rhosp 13 Pre-requisites:1. Server for registry that has 2 nics to connect to internet and disconnected servers2. Director configured with latest minor release3. Current Redhat subscription 4. Hundreds of GB free, preferably a TB. It is wise to have /var as a separate mounted …
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Hits: 2462 Install Dnsmasq which is the lightweight DNS forwarder and DHCP Server Software. [1] Install Dnsmasq. [root@dlp ~]# yum -y install dnsmasq [2] Configure Dnsmasq. [root@dlp ~]# vi /etc/dnsmasq.conf # line 19: uncomment (never forward plain names) domain-needed # line 21: uncomment (never forward addresses in the non-routed address spaces) bogus-priv # line 41: uncomment (query …
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Hits: 294YAML Files YAML files are central to installing and upkeep of the Openstack. YAML stands for Yet Another Markup Language. It is considered to be human readable too. Columns for subcategories on new lines are set spaces. Non-standard characters can also cause errors. It is not always clear what the errors are. Openstack scripts …
Hits: 365Open Virtual Switch was initially conceived in a university environment, with a flow-based model providing the development primitive, and a central controller determining what those flows actually looked like. The use of OVS as a virtual switch in the IaaS market (and to be specific, in the OpenStack IaaS market) came about because the …
Continue reading “Battle of the Switches – Open Virtual Switch vs. Linux Bridge”
Hits: 2770 Understanding and confuting Image Streams is central for getting Openshift to work as you need it to work, with images and code that you desire. Over the course of the past few weeks, I have been gathering feedback around Image Streams. This feature can cause a lot of misunderstanding and confusion, even for …
Hits: 340Here are some common concepts that need to be running on your systems, in order to be relavent: Openshift microservices docker kubernetes pods Work with Docker as microservices saves compute recources, However, it requires re-thinking how development is done. Microservices also enable Continuous Integration of changes to large applications. Red Hat OpenShift is an …
Continue reading “בלוגים – Test whether your Openshift is installed and working”
Hits: 405Hostnames and FQDN are often far from what you desire. Very often in the cloud, be it Openstack, Amazon, Azure or GC, The default hostname is not what you need. When you change the name, it often reverts after reboot. This is due to Cloud Init run at every boot. Change a Red Hat …
Continue reading “בלוגים – Howto: Set FQDN of a Redhat Linux cloud instance”
Hits: 344I started working at Octopus Computer Solutions Steve Bar Yakov Gindi has a new job. I am the Devops and Openstack/Openshift Expert. For a few months I have been working for Octopus Computer Solutions in Tel Aviv. I have been working with customers and in house with Open Source Red Hat Subscriptions software. I …
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Hits: 554This looks like a good Ansible Playbook to install Drupal 7 or any version, both on nginx and Apache. https://lakshminp.com/just-enough-ansible-drupal Setup Back to our newly minted machine. Let’s ensure Ansible is able to communicate with our server. First, we need to create a configuration file for Ansible. This is called ansible.cfg and it’s in INI format. …
Continue reading “Just enough Ansible for Drupal | Lakshmi Narasimhan”
Hits: 12766Run Command on lots of servers via ansible copy directories and files With Ansible you turn most fields into variables. I need to copy a bunch of files to servers so here is how to do it. You can find more examples at the link below Openshift heavily uses ansible as part of its …
Hits: 510I am using ansible and want to avoid password when installing stuff as root I usually use an AWS VC2 for development, but this time I decided to use VMware. When doing sudo Ubuntu and others ask for a password. I thought that EC2 does the passwordless elevation with keys, but found that it …
Continue reading “How to Run ‘sudo’ Command Without Entering a Password in Linux”