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When we write a program, we often need to judge the execution result of the previous step, so the judgment needs to be realized by using if statement. if statement is mainly used for judgment in our program. 1, if syntax 1.1 single branch if if condition;then Command to execute 1 Command to execute 2 Command to execute 3 . ...

1. Introduction to ZABBIX zabbix is an enterprise class open source solution based on WEB interface to provide distributed system monitoring and network monitoring functions. zabbix can monitor various network parameters to ensure the safe operation of the server system; Flexible notification mechanism is provided to enable system adminis ...

catalogue 1, inode and block overview 1. block 2. inode (index node) 3. inode content 4. cp and inode 5. mv and inode 6. Structure after hard disk partition   7. Simple process of accessing files   8. inode size   9. Special role of inode 2, Hard link and soft link 1. Hard link 2. Soft link 3. The difference between ...

Mailbox 163 The alarm notification can be sent by mail. Then, in the previous document, we configured the sending email alarm method. 1. Set 163 mailbox To send mail, you need an smtp mail server. First, you need to set Netease mailbox. First log in to mailbox 163 and enter the mailbox center settings. Then start POP3/SMTP service, where yo ...

To start using Docker Engine on CentOS, make sure   Preconditions met , then   Install Docker. precondition Operating system requirements To install the Docker engine, you need a maintenance version of CentOS 7 or 8. Archive version is not supported or tested. The CentOS extras library must be enabled. This repository is enabled ...

catalogue background problem improvement install CSI storage capability detection Persistent volume snapshot and recovery feature validation Basic performance test reference resources background Kubernetes (K8S)   The Container Storage Interface (CSI) was upgraded to GA status in K8S v1.13 at the end of 2018. It provides a stan ...

Preface Firewall is just like the Great Wall of China. It is used to protect the people inside the wall from outside malicious invasion. So is the firewall of Linux. It can filter and restrict data packets, which is the package filtering firewall to be explained in this paper. 1. Packet Filtering Firewall 1. Understanding the packet filt ...

Record the errors reported by Centos8 during startup and the solutions Startup error 1: Note: in this case, it means that the Centos8 service has been started, but there is a problem with the interface startup. At this time, it can be used (xshell connection) and the service can be accessed. Solution 1: 1. Use xshell and other soft ...

1. Cluster preparation Cluster: a group of servers doing the same work 1.1 cluster construction of virtual environment The web01 virtual machine will be shut down first for cloning. Boot configuration ip hostname The configuration of the web cluster is as follows: Host nameipweb01192.168.246.7web02192.168.246.8web03192.168.246.9 Mo ...

[transferred from Darshana of FOSS Linux< Installing Sonatype Nexus Repository OSS on CentOS 7 >[translation] Sonatype Nexus is a popular repository manager for most components, binaries, and build artifacts worldwide. It supports the Java virtual machine (JVM) ecosystem, including Gradle, Ant, Maven, and Ivy. Compatible standard tools ...