Devops Blog – Openstack, Openshift,- Docker, Kubernetes, Swarm, Linux, Windows Stacks – Mongodb, An occasional opinion
Open 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 resources …
Continue reading “Battle of the Switches – Open Virtual Switch vs. Linux Bridge”
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 long-time users. …
Here 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 open …
Continue reading “בלוגים – Test whether your Openshift is installed and working”
Hostnames 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 Openstack …
Continue reading “בלוגים – Howto: Set FQDN of a Redhat Linux cloud instance”
The directions at the link below were great. I am seeking employment and the employers to see how they will benefit from my vast knowledge!!! The standard twentyseventeen WordPress theme only shows the entire article, even when you chose excerpts. The theme editor didnt work correctly. This is what I did: I made a child …
When you have a bunch of servers that are configured the same and need to run the same task on them you will need a tool that does that. There are several Open Source tools. I was asked to write such a script but quickly fell upon several really popular scripts. The perfect one for …
Continue reading “How to get a Shell Prompt from multiple servers and run commands on them ? Clush”
The project puts 3 applications inside a single Docker Container. These are MongoDB, Tomcat and Python. The first 2 usually conflict with standard containers that usually run one of them in the “foreground” which only one can do. Official containers have just one. Centos incorporated SystemD into its official container, but it’s a bit of …
When I am trying to check binary log: SHOW BINARY LOGS; I get this error: ERROR 1381 (HY000): You are not using binary logging. How to resolve this? Can anybody help? Remove section [mysqld_safe] and replace with [mysqld]. It works for me. I had placed new config data under mysqld_safe, which is wrong. I am …
I need to Call a MEAN stack app into an Apache server, Here is how I might call the mean app. I am designing a platform that divides a monolith app into micro-services with high availability. To the URL first set the PHP resource: $ch = curl_init(); direct example: CURL_EXEC: <?php // create a new cURL …
Continue reading “How to call URL of any other website in PHP”
The following script looks just up my alley, as I am working on a python script to automate setting up servers around the world so that clients get served from a local server. import boto3 client = boto3.client(‘route53’, aws_access_key_id=”AWS_KEY”, aws_secret_access_key=”AWS_SEC_KEY”) hostedZoneId = ‘HOSTED_ZONE_ID’ ip= ‘123.123.123.123’ if aws_region == “US”: #US is my default region. …
This is an interesting read about AutoScaling in AWS using Autoscale and Load Balancer. It has some discussions about How to do this via Continuous Integration and Continuous Delivery (ci/cd) Here’s a rough approach to scaling any stateless app on AWS: Run the app in an Auto Scaling Group (ASG). An ASG makes it easy to …
Continue reading “Where to start? Scaling PHP applications on AWS – CI CD too”
My Goal this time is to make a script for AWS Marketplace that creates EC2 instances with Apache Httpd installed that are launched in different regions, and to set route53 to use a geo-location to open each server, also to sync one directory for content that will be universal and other that aren’t synced at …
Continue reading “How to manage subdomains in different AWS accounts with Route53”
Paste under mynetworks: ####### smtp auth smtpd_tls_auth_only = no smtp_use_tls = yes smtpd_sasl_auth_enable = yes smtpd_sasl_type = cyrus local_recipient_maps = smtpd_use_tls = yes smtp_tls_note_starttls_offer = yes smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom ######## Then: vi master.cf Paste under smtp: smtps inet n …
Continue reading “Postfix SMTP Authentication – On The Secure Port Only”