In-depth interpretation of sequences in PostgreSQL and their related functions, and interpretation of postgresql
I. Introduction
A sequence object (also called a SEQUENCE generator) is a special single-row table created using create sequence. A sequence object is usually used to generate a unique identifier for a row or table.
Ii. Create a sequence
Method 1: Specify the field type as serial directly in the
to the build image.
In addition, OPS will want this OpenStack lifecycle management system to span bare metal, IaaS, and even PAAs.What Atomic, Docker, Kubernetes bringIf you have an OpenStack service lifecycle management scenario, the following benefits can be created:
Isolated, lightweight, portable, detachable
The service relationship of the running state is easy to describe
Easy to run, easy to update
Manage service life
Brief introduction:Docker: An open-source application container engine that can create a lightweight, portable, self-sufficient container for your application.Kubernetes: The Docker container Cluster Management system, which is open source by Google, provides the functions of resource scheduling, deployment operation, service discovery, capacity scaling and so on for containerized applications.ETCD: A highly available key-value storage system developed and maintained by CoreOS, primarily for sha
Article from: Listen to the Cloud blogAs our business continues to grow, our number of applications has exploded. With the growth of application explosion, the difficulty of management is increased. How to quickly complete the expansion while the business explosion is growing is a big challenge. The advent of Docker happened to solve our problem. With Docker, we can quickly complete the expansion and contraction, and the configuration is uniform and error-prone.In the Docker cluster management s
Kubernetes about the service exposure is mainly through the Nodeport way, through the binding minion host of a port, then the pod request forwarding and load balancing, but this way the defect is
The service may have many, if each is bound to a node host port, the host needs to open the perimeter of a heap of ports to make services calls, management confusion
Cannot apply firewall rules required by many companies
The ideal way is thr
footprint.3. Log in hub.docker.com using the Docker login command4. Push the local image to hub.docker.com using a command such as Docker push Chenxizhang/mvcapp, which may take a certain amount of time, depending on your network configurationIf all goes well, you can see the following resultsNote: If you are creating your own Docker warehouse, you can learn about the Azure Container Registry service. (https://azure.microsoft.com/zh-cn/services/container-registry/), do not unfold here.Create
The next one is to deploy and expand the Kubernetes cluster based on rancher7. Configuring Redis with ConfigmapHttps://github.com/kubernetes/kubernetes.github.io/blob/master/docs/user-guide/configmap/redis/redis-configRedis-configMaxMemory 2MB Maxmemory-policy Allkeys-lru# kubectl Create Configmap example-redis-config--from-file=./redis-config# Kubectl Get configmap example-redis-config-o yamlapiversion:v1d
OverviewKubernetes is a powerful container orchestration tool that enables users to reliably deploy and run containerized applications on a scalable system. Within the container area, k8s has undoubtedly become a community standard for container orchestration and management, and even Docker has announced support for K8s. The fighting in the field of container orchestration has been turned around, and the dust settles, and k8s has been unanimously endorsed by the players including Google, Huawei,
Teaches you how to accelerate the deployment of k8s in China and implement custom settings that have a k8s image of the warehouse with its namespace.OverviewKubernetes is a powerful container orchestration tool that enables users to reliably deploy and run containerized applications on a scalable system. Within the container area, k8s has undoubtedly become a community standard for container orchestration and management, and even Docker has announced support for K8s. The fighting in the field of
certification aspects of processing, certification is actually entrusted to K8s Apiserver responsible, dashboard just based on user login information generated Authinfo object, encrypted as token carried in the browser, that is Jwe protocol, Jwe Sub-package is the implementation of the JWE protocol, where Keyholder (Rsakeyholder concrete Class) manages the key pair used by Jwe and stores the secret key in Kubernetes-dashboard-key-holder Secrets objec
The previous blog post describes the deployment of the K8s cluster, which focuses on deploying Kube-dns and dashboard.Environment descriptionNode-1 (Master): 10.0.0.1Node-2:10.0.0.2Node-3:10.0.0.3The cluster uses a binary installation, and the Flannel network plug-in is deployed.Kube-dns
When doing the following, you must have already deployed the k8s cluster, if you do not have such a cluster, please refer to my previous blog post.
1, find the corresponding Yaml file on the offici
First of all, we need to understand the function of kubernetes, in short, it provides a container orchestration technology, to provide users with a container-based service rapid deployment, upgrade, rollback, access control, elastic scaling and other scheduling functions, so that users in the development, testing, production environment can achieve agile development, The purpose of fast and reliable delivery.Second, you need to understand the kubernet
Kubernetes is Google open source container choreographer, very suitable for the current hot micro-service architecture, in the Container choreography field, is gradually building a dominant position. This article mainly aims at the Kubernetes service to do some analysis, first briefly introduces the basic concept.
Basic concepts
The Pod:kubernetes minimum Dispatch unit is a set of containers that can be und
mountpath:/logs
volumes:
-name:app-logs Emptudir
: {}
View Log kubectl logs 5. Configuration management of Pod
The Kubernetes v1.2 version provides a unified cluster configuration management solution –configmap. 5.1. Configmap: Configuration management for container applications
Usage Scenario: Live as an environment variable within a container. Set startup parameters for the container startup command (set to environment variable). Mou
Use Google Cloud deployment Manager to install and run Istio's quick start instructions in Google kubernetes Engine(Gke).
This quick start is used to create a new Gke cluster, install Istio, and then deploy the BookInfo sample application. It is performed automatically using Deployment Manager and is described in detail in the istio on kubernetes setup Guide .
Note: The default installation creates a Gke Al
1.1. What is Kubernetes?A new approach to distributed architecture based on container technologyA complete distributed system support platformKubernetes is an open source project launched by the Google team, which aims to manage containers across multiple hosts, provide basic deployment, maintenance, and use scaling, primarily to implement the language as the Go language.1.2. Basic ConceptsNode: In Kubernetes
Kubernetes Network Model
A fundamental principle of the Kubernetes network model design is that each pod has a separate IP address, and that all pods are in a flat network space that can be directly connected. So whether or not they run in the same node (host), they are required to be accessed directly from each other's IP. The reason for this principle is that the user does not need to consider ho
One. Container:1. A container is a way to run one or a set of processes, isolating these processes from other processes on the host2. Containers are similar to virtual machines, but different from virtual machinesContainer virtual machineKernel calls the host's kernel per virtual machine oneStart speed seconds-level minuteResources use only the processes in the container occupy the entire virtual machineTwo. What is Kubernets?1. is a container organizer, or container manager:Not only manages con
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