centos 7.x cloudstack 4.11 Tip: In the production environment, it is recommended to use ceph block storage as the main storage. The test here uses nfs main storage. components 172.16.19.116 cloudstack-management nfs,mysql,cloudstack-management 172.16.19.170 cloudstack-agent kvm, cloudstack-agent td> Prepare network segment: 172.16.17.50-100 255.255.252.0 172.16.16.1 ###cloudstack-management 1. Basic system configuration #hostnamectl set-hostname cloudstack-management //Install ntp #yum install […]
Tag: dst
Monitor system performance and resources using Linux’s dstat command
Use the Linux dstat command to monitor system performance and resources In Linux systems, understanding the system’s performance and resource usage is critical for effective management and troubleshooting. dstat is a feature-rich command line tool that provides real-time monitoring and statistics of system performance and resources. This article will introduce how to use the dstat […]
Linux hardware time (RTC time), system time (UTC time, Universal time), local time (Local time), time zone (Time zone) and daylight saving time (DST) analysis
Article directory Understand time: hardware time, system time (UTC time), local time, time zone and daylight saving time 1. Hardware time (RTC time) 1.1 Introduction to hardware time 1.2 How to use hardware time 2. System time (UTC time) (Universal time) 2.1 Introduction to system time 2.2 UTC time 3. Local time 3.1 Introduction to […]
mybatis-plus optimization-rewriteBatchedStatements improves rapidly
mysql official document:rewriteBatchedStatements related introduction Next, we use the WWW method to understand rewriteBatchedStatements 1. What is it? rewriteBatchedStatements is a new setting parameter added in Mysql version 3.1.13. indicates whether to enable the batch update rewrite function. true means on, false means off (Default); Many articles on the Internet say that drivers of version […]
Android Jetpack understands SavedStateHandle
jetpack library understands SavedStateHandle Function Cooperate with ViewModel to restore the related state data of ViewModel from the destruction and reconstruction of Activity. We know that when Activity is destroyed and rebuilt by the Android system, the onSaveInstanceState and onRestoreInstanceState methods will be called. This method is invisible to ViewModel. SavedStateHandle fills in Clear this […]
SpringCloudStreamkafka failed to receive jsonarray string
Article directory scene phenomenon Introduction to Spring Cloud Stream Problem solving Scene phenomena As a message queue, Kafka serves as a channel for front-end device data to be consumed by the back-end, and is also consumed by multiple different microservices. A service establishes a socket message with the front-end edge computing device, receives real-time traffic […]
SpringCloudStream+RocketMQ transaction message configuration
The version used in this article spring-cloud-stream 3.2.6 rocketmq-client 4.9.4 spring-cloud-starter-stream-rocketmq 2021.0.5.0 1. Dependency import <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-stream-rocketmq</artifactId> </dependency> This version no longer requires the introduction of rocketmq-spring-boot-starter dependency This version of stream does not support the @EnableBinding annotation, and this version of rocketmq does not support the txProducerGroup parameter. 2. Writing producers 1. Write […]
Using PreparedStatement to operate the database: query
We completed the common addition, deletion and modification operations for operating the database in the previous article. Now in this article we will implement the operation of querying the database. Take the customers table as an example Examples of query operations The operation of querying the database returns an additional result set compared to the […]
Correspondence between Git commands and AndroidStudio’s Git menu
First of all, I feel ashamed. I have been using Android Studio for development for a long time, but I am still struggling with Git version control. I decided to sort it out in the past two days and write this article to inspire others. Why don’t I just talk about Git commands? Because I […]
SpringCloudStream simply integrates RocketMQ and transaction messages
Spring Cloud Stream integrated messaging system Introduction ? Spring Cloud Stream is a framework that unifies the message middleware programming model, shields the differences in the underlying message middleware, reduces learning costs and switching costs, and its core is to further encapsulate the message middleware. The official definition of Spring Cloud Stream is a framework […]