ansible notify

Ansible installation nginx for rolling back the publishing functionFirst, the preparatory work1. Prepare two machinessai:192.168.131.132--"Ansible's service sideluojy:192.168.131.133--"Ansible's client2, 132 machine installed Ansible(1) Yum install-y epel-release (2) Yum install-y ansible 3, 132,133 turn off firewall 4 on the machine, set hostname,/etc/sysconfig/

There are many ways to define and reference variables in Ansible playbook, which are tested in the local environment and collated as follows. test Environment: Using your own Mac notebook to install Ansible as the control server, the VMware Fusion virtual machine runs on a CENTOS7 virtual machine (192.168.243.146) as a remote controlled host tested with Playbook as follows: Cat Test.yml --- -hosts:test re

Ansible an open source platform that integrates the configuration management of IT systems, applies deployments, and performs specific tasks. Ansible has the following characteristics:Simple deployment, only the main control side of the deployment of ansible environment, the controlled side does not need to do any action;The device is managed by default using the

Communication between Threads uses the Wait/notify method to implement inter-thread communication. Both of these methods are methods of the object class, meaning that all Java objects provide both methods. 1, wait and notify must match synchronized key (or sync Lock) use 2, wait method to release the lock (Wait), notify method does not release the lock (notificat

Java multithreaded design mode wait and notify mechanism summary: The wait and notify methods must be written in the synchronized method, that is, before calling the wait and notify methods, you need to obtain the object lock; call the Wait method to release the lock; After the wait method returns, you need to obtain the object lock to continue execu

memory lock is a mutually exclusive operation against the same object, and the static member belongs to the class proprietary, and its memory space is owned by all members of the class, which causes synchronized () to lock the static member, which is equivalent to lock the class, that is, to achieve mutual exclusion among all members of the class. At the same time, only one thread can access an instance of the class. Let's just say that the simple truth is that threads in Java now repel each ot

This article is for Java's Wait (), notify (), Notifyall () for a detailed analysis of the introduction of a friend that needs reference underWait (), notify (), and Notifyall () are all methods of Java.lang.Object:Wait (): Causes the current thread to wait until another thread invokes the Notify () method or the Notifyall () method for T His object.Notify (): Wa

release the lock. It is generally done after the synchronized code block (block of code locked) release the lock, you can also use wait () way to release the lock halfway. Wait () way like squat toilet to half, suddenly found the sewer blocked, must come out to stand on one side, so that repair sewer master (ready to perform a notify thread) in to dredge the toilet, dredge finished, the master shouted: "has been repaired" (

Wait (), notify () and Notifyall () are all java.lang.Object methods: Wait (): Causes the "current thread" until another thread invokes the Notify () method and the Notifyall () method for T His object. Notify (): Wakes up a single thread, is, waiting on the This object ' s monitor. Notifyall (): Wakes up all threads that are waiting on the This object ' s monito

In Java, all objects can be used as "monitor monitors"-an entity that has an exclusive lock, an ingress queue, and a waiting queue.The non-synchronous methods of all objects can be called at any time by any thread, and there is no need to consider locking issues at this time.For the synchronization method of an object, there are only a few threads that have an exclusive lock on that object to invoke them at any one time. For example, a synchronization method is exclusive. If a thread calls the s

Methods control access to class member variables: each class instance corresponds to a lock, and each synchronized method must obtain the lock of the class instance that calls this method before execution. Otherwise, the corresponding thread is blocked, once the method is executed, the lock is exclusive until the lock is released when the method is returned. Then, the blocked thread can obtain the lock and re-enter the executable status. Wait ()/notify