The content of this article has been validated based on k8s v1.8.8. K8s Service defines the access entry address of a server, the front-end application accesses a cluster of pod replicas behind it through this entry address, and the access requests from outside are load balanced to each container application on the back end. Between the service and the back-end pod replica cluster, the docking is done throu
workqueue. In fact, the real business logic is in the worker, the general 1 Controller will start a lot of goroutines run Workers, processing workqueue in the items. It calculates the difference between the state that the user wants to reach and the current state, and then sends a request to Apiserver via clients to drive the state evolution of the cluster to the user's requirements. The blue is the original client-go, red is the code that was filled in when you wrote the controller.
Let's t
ClusterCluster is a collection of compute, storage, and network resources, and Kubernetes uses these resources to run various container-based applicationsMasterMaster is the brain of cluster, whose primary responsibility is scheduling, that is, deciding where the application will run. Master runs the Linux operating system, which can be either a physical machine or a virtual machine. To achieve high availability, you can run multiple master.NodeNode's job is to run the container app. Node has ma
has the following key features:
Have a unique named name
Have a virtual IP and port number
Ability to provide remote service
is mapped to a set of container applications that provide this service capability
Service processes are based on socket communication for external services (such as Redis, Memcache, MYSQL, Web Server), and a service is typically serviced by multiple related service processes. Each service process has a separate endpoint (ip+port) access point, bu
Deployment advantages relative to RCRS and deployment are mainly used to replace RC. RS is all called Replica Set. The advantages relative to rc,rs and deployment are as follows:
RC only supports equation-based selector, such as Env=dev or ENVIRONMENT!=QA. However, in RS, a new set-based selector, such as version in (v1.0,v2.0) or env not in (DEV,QA), is also supported. This brings convenience to complex operations management.
Upgrading the pod
This article is translated by yake_099 (blog) from Raywenderlich, author: Joshua Greene
Original: How to Create CocoaPods with Swift
You may be familiar with some of the more famous open-source cocoapods frameworks, such as Alamofire, Mbprogresshud. But sometimes you may not find the pod that just meets your needs, or you need to split a large project into smaller, reusable components.
Fortunately, creating your own cocoapods is an easy thing to do.
I
本身的维护; 而kubernetes实际上也是状态的维护, 只不过是容器级别的状态维护; 不过kubernetes在容器级别要做到不仅仅状态的维护, 还需要docker跨机器之间通信的问题.Related concepts
1:pod
A pod is a collection of containers, each of which can contain one or more containers; For ease of management the same container that runs the same business in a pod
Containers of the same
with the following command:
$ gem sources-l
Only the following text appears in the terminal to indicate that your command was successful:
Current SOURCES * * *
https://gems.ruby-china.org/
# Make sure only gems.ruby-china.org
Fourth Step: Install Cocoapods
sudo gem install-n/usr/local/bin cocoapods
One more word, perfect solution.
sudo xcode-select--switch/applications/xcode.app
Enter the following command in the terminal to complete the installation:
Pod
, node cluster's load nodesEach node is assigned a certain workload (container) by master, and when node stops running, master dispatches the container to the other Node,node nodes including a set of critical processes:
Kubelet responsible for the creation of pod corresponding container, start-Stop task
Kube-proxy for service communication and load balancing
Docker engine Docker engines are responsible for the creation and management
The essence of swarm and k8s are container orchestration services.They can abstract the underlying host, and then start the application from a built-in image and eventually deploy it to a host on a docker basis. Which scenario should be chosen as our container cloud service? I think k8s (kubernetes short) and swarm compared to MySQL and SQL Server comparison, the former lightweight, implementation fast, in order to achieve core functions, more suitable for small-scale deployment, the latter is e
Device window, select the device you want to run. If necessary, create a new emulator. Click OK.Note:Project in Android view, test the location of the fileProject location test files under Project viewMonitor the process of testing in the Run window at the bottom of the IDE. Android studio recreated and generated the project, and in the Run window opens a new tab page based on the name of the test, as shown in 3. You can see in this tab page whether the test passed and how long it will take to
the CNM.Next, we introduce the concept of network and the principle of communication in kubernetes.In Kubernetes's network model, three basic constraints are agreed:
All containers can communicate with each other directly by IP without snat.
All hosts and containers can communicate with each other directly by IP without snat.
The container sees its own IP as the container IP that other containers see.
On the basis of satisfying the constraint, kubernetes does not care abou
This article CSDN blog address: http://blog.csdn.net/huwh_/article/details/71308171First, the kubernetes of the general structure of the two, kubernetes each component introduction (a) kube-master[control node]
Workflow Flowchart for Master
Kubecfg sends a specific request, such as creating a pod, to the Kubernetes Client.
Kubernetes client sends the request to API server.
The API server is based on the type of request,
Failure phenomenon:
The phone is not connected to the computer.
Solution:
Tip: Use the Pea Folder Wizard software to the mobile phone data security threat, please use carefully.
Mode one: Use USB data cable to connect with computer:
In order to let the Pea Pod Cell Phone wizard correctly identify your mobile phone, you need to turn on the phone's USB debug switch, the following steps:
menu-Settings-application-check "unknown source"-click "Devel
/ruby/1.8/rdoc/rdoc.rb:280:warning:conflicting ChDir during another chdir block
/system/library/frameworks/ Ruby.framework/versions/1.8/usr/lib/ruby/1.8/rdoc/rdoc.rb:287:warning:conflicting ChDir during another chdir block
So the download is installed Cocoapods
3. Use Cocoapods
A create a new project with the name Podtest
b terminal, CD to the total list of items (note: The head record containing the Podtest folder, Podtest.xcodeproj, Podtesttest)
C Establish podfile (config file)
Ne
/binding API in Kubernetes, Scheduler is responsible for pods allocations on each node. Scheduler is plug-in, Kubernetes can support user-defined scheduler in the future.4. Kubernetes Controller Manager ServerController Manager Server is responsible for all other functions, such as the endpoints controller responsible for creating and updating endpoints objects. Node Controller is responsible for the discovery, management and monitoring of nodes. These controllers may be split in the future and
CocoaPods, we only need to put the used open source library into a file named Podfile, and then execute pod install, cocoapods automatically downloads the source code of these third-party open-source libraries and sets the system dependencies and compilation parameters for our projects.Iii. CocoaPods principles
The principle of CocoaPods is to place all the dependent libraries in another project named Pods, and then let the main project depend on the
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