Building ntp time synchronization service on linux

1. Introduction to NTP NTP (Network Time Protocol) is a protocol used to synchronize computer time. It can make the computer synchronize its server or clock source, and it can provide high-precision time correction (the difference between LAN and standard is less than 1 millisecond, and tens of milliseconds on WAN). For the server cluster, thi ...

Posted by berbbrown on Fri, 22 Apr 2022 06:25:26 +0300

docker - install and deploy K8S cluster

kubernetes In Greek, it means captain or navigator Before the container technology, if multiple applications are running on the physical server, one application may occupy most of the resources, which may lead to the performance degradation of other applications. One solution is to run each application on different physical servers, but it ca ...

Posted by kevinn on Thu, 21 Apr 2022 05:24:35 +0300

Django project practice: CMDB asset scanning and DevOPS automatic operation and maintenance

Article catalogue Project practice: CMDB automatic asset scanning and automatic operation and maintenance 1. Project introduction2. Project technical analysis Difficulties and pain points of operation and maintenance automationTechnical difficulties of the projectOverall engineering design3. Project environment construction Projec ...

Posted by amar3d on Mon, 18 Apr 2022 18:43:37 +0300

Advanced learning of operation and maintenance: MySQL single table query

MySQL third job MySQL single table query job The material is as follows: DROP TABLE IF EXISTS `course`; CREATE TABLE `course` ( `cs_id` int(11) NOT NULL COMMENT 'course number', `cs_name` varchar(50) NOT NULL COMMENT 'course name', `cs_credit` tinyint(255) unsigned DEFAULT NULL COMMENT 'course credit', `cs_type` char(12) DEFAULT NULL CO ...

Posted by shak123 on Mon, 18 Apr 2022 10:16:06 +0300

[VLAN advanced technology] - explanation of MUX VLAN operation principle and example configuration

1, Causes of MUX VLAN In my opinion, MUX VLAN is mainly designed for large and medium-sized networks. Generally, there are many departments with different responsibilities in large and medium-sized enterprises. Each department requires mutual independence, but some departments need to visit each other. If it is a large company, it will hav ...

Posted by siddscool19 on Mon, 18 Apr 2022 02:43:49 +0300

HA High Availability Configuration and Failover in Database

1. Overview of MHA MHA (MasterHigh Availability) is an excellent set of software for failover and master-slave replication in MySQL highly available environment.The emergence of MHA is to solve the MySQL single point problem.During MySQL failover, MHA can automatically complete the failover within 0-30 seconds.MHA ensures maximum data cons ...

Posted by expostfacto on Sun, 17 Apr 2022 20:22:33 +0300

The most complete openstack deployment process in the whole network (documents that beginners can build)

1. Host preparation nameIP addressHost nameremarksControl node10.0.0.11controllerMinimum 4G, enable virtualizationCalculation node10.0.0.31computelMinimum 2G, enable virtualization 1.2. Control node 1.3. Calculation node 2. Basic configuration #Modify the host IP address and host name, do hosts resolution, close selinux and close the firewa ...

Posted by themightydude on Sun, 17 Apr 2022 15:52:19 +0300

Shell script for loop experiment

catalogue 1. Calculate the sum of 1-100 2. Prompt the user to enter an integer less than 100 and calculate the sum of all integers from 1 to this number 3. The even and odd sums of all integers from 1 to 100 4. Execute the script and enter the user name. If the user exists, the output will prompt that the user already exists; If the user do ...

Posted by hitman6003 on Sat, 16 Apr 2022 19:00:52 +0300

k8s 3master+2worker node (kept + haproxy highly available)

k8s-v1.20.10 3master&1node Experimental environment Host network information and component information K8S cluster roleIPhost nameInstalled componentsVIP192.168.0.15VIPVIPMASTER192.168.0.11k8s-master-1apiserver,controller-manager,scheduler,etcd,docker,kubectl,kubelet,kube-proxy,calico,coredns,metric-server,keepalivedMASTER192.168.0.12k8s ...

Posted by pablocullen on Sat, 16 Apr 2022 15:49:50 +0300

kubernetes installation (domestic network + Alibaba cloud)

Operating system: CentOS-7.8 kubernets version: 1.20.4 docker version: 20.10.3 This is an installation tutorial, including docker installation, kubernetes installation and Kube flannel network plug-in installation. The whole installation process uses the domestic network environment. With the support of Alibaba cloud's image service, the ins ...

Posted by jaco on Sat, 16 Apr 2022 01:22:42 +0300