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Openstack command not working from undercloud as well as overcloud due to maxconn on haproxy

October 19, 2020 opensourcemint 1638

Error : Openstack commands are not working. Sometime, error visible like below and sometime, it get hang completely. [stack@undercloud (overcloudrc) ~]$ nova list ERROR […]

How Kubernetes related to Docker?

What is Kubernetes? Kubernetes is an open-source container management software developed in the Google platform. It helps you to manage a containerized application in various […]
What is Kubernetes?

Kubernetes is an open-source container management tool which holds the responsibilities of container deployment, scaling & descaling of containers & load balancing. a key features […]
How Kubernetes different from Docker Swarm?

Installation & Cluster Config : Kubernetes : Setup is very complicated, but once installed cluster is robust. Docker Swarm : Installation is very simple, but […]
Harbor Architecture Explained

Harbor : Harbor is an open source trusted cloud native registry project that stores, signs, and scans content. The mission is to provide Cloud Native […]
Openstack commands not working from undercloud as well as overcloud due to endpoint missing

Error : Client exception error while execution any openstack commands, #nova list Service Unavailable: The server is currently unavailable. Please try again at a later […]
Openstack command not working from undercloud as well as overcloud due to maxconn on haproxy

Error : Openstack commands are not working. Sometime, error visible like below and sometime, it get hang completely. [stack@undercloud (overcloudrc) ~]$ nova list ERROR […]
Linux Crontab

Crontab: Which run periodically as per the definition. (example scheduler’s run certain task as per instructions which is set to it. or Configuration file that […]
How to Create Linux VM using Google Cloud and access using putty from local machine

7. Here, i selected the “Debian Linux ” . Can change the OS with the option “Change“ iii. SSH key generating process. […]
Python Data types explained for beginners

Available datatypes in python : Numeric : int, float, complex Text : str Sequence […]
Python Variable explained for beginners

Variables are used to store the data values To print a number or string, >>> x = 9 >>> y = “Hello python, How […]
Python Indentation explained for beginners

Indentation is a space which need to provide right place with enough space for every line. otherwise, will face an error while executing the program. […]
Failed to connect socket to /var/run/libvirt/virtlogd-sock

Issue: ==== error : virDBusGetSystemBus:109 : internal error: Unable to get DBus system bus connection: Failed t… or directory warning : networkStateInitialize:787 : DBus not […]
kubernetes nodes explained

The nodes are either a virtual machine or physical machine in the Cluster but every Cluster, multiple nodes will running on it. Node is […]
Overview about the Kubernetes commands and usage

Collect the Cluster details : To get the clusters : kubectl config get-clusters [node1 ~]$ kubectl config get-clusters NAME kubernetes [node1 ~]$ To get […]
How to check the Linux version

There are multiple way where we will check the linux version and find the way to do. 1. /etc/os-release is file has the linux distribution […]
Python introduction for beginners

Hi Welcome to Python . Python is a very popular programming language and started using almost every where. Lets start having some basic knowledge about […]
Kubernet Cluster Architecture

There are 2 roles in the kubernet cluster, Master node Worker node Let’s get into the components of the […]
Rabbitmq server : unable to connect to node ‘rabbit@node-0’: nodedown

Rabbitmq node is down in rabbitmq cluster as well as in PCS and the smae fixed after making the rabbitmq-server up
neutron-server.service failed – ERROR: Could not bind to 10.239.176.13:9696

neutron-server.service failed and the same not coming up.
How to play with netstat

netstat is a command-line network utility that displays network connections for Transmission Control Protocol, routing tables, and a number of network interface and network protocol statistics
How to create the kdump ( crash ) when Linux system get hanged with no reason

kdump is a feature of the Linux kernel that creates crash dumps in the event of a kernel crash. When triggered, kdump exports a memory image that can be analyzed for the purposes of debugging and determining the cause of a crash….
How to play with Tcpdump

Tcpdump is a packet analyzer program that runs under a command line interface. It allows the user to display TCP/IP and other packets being transmitted or received over a network .

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How Kubernetes related to Docker?

What is Kubernetes?

How Kubernetes different from Docker Swarm?

Harbor Architecture Explained

Openstack commands not working from undercloud as well as overcloud due to endpoint missing

Openstack command not working from undercloud as well as overcloud due to maxconn on haproxy

Linux Crontab

How to Create Linux VM using Google Cloud and access using putty from local machine

Python Data types explained for beginners

Python Variable explained for beginners

Python Indentation explained for beginners

Failed to connect socket to /var/run/libvirt/virtlogd-sock

kubernetes nodes explained

Overview about the Kubernetes commands and usage

How to check the Linux version

Python introduction for beginners

Kubernet Cluster Architecture

Rabbitmq server : unable to connect to node ‘rabbit@node-0’: nodedown

neutron-server.service failed – ERROR: Could not bind to 10.239.176.13:9696

How to play with netstat

How to create the kdump ( crash ) when Linux system get hanged with no reason

How to play with Tcpdump