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preface Environment: CentOS 7 0 zabbix-server5. four point three In this chapter, we will first look at how to create monitoring items and graphics, and then create custom monitoring items according to the requirements of the host. Create monitor item After selecting a host, select Create monitoring item, as shown below: Then select a key v ...

What is a mail server? E-mail is an information transmission behavior that uses the network to transmit information to remote servers. We can send files or information to any place on the earth where there is a network, and we can also connect to the internet to receive mail anywhere there is a network. However, there are some problems: 1. Ema ...

ls (list files) command is used to display the list of file directories, which is similar to the DOS command dir under Windows system. When executing ls command, only the file name of non hidden file, sorting by file name and the color represented by file name are displayed by default. When no parameters are added, the list information of the c ...

2.5 HTTP method to inform the server of intention In this chapter, we will learn a lot about the methods used in HTTP. First, take a look at the chart methodexplainSupported HTTP versionsGETGet resources1.0,1.1POSTTransport entity principal1.0,1.1PUTtransfer files1.0,1.1HEADGet message header1.0,1.1DELETEDelete file1.0,1.1OPTIONSAsk for suppo ...

1. Distributed file system Distributed file system refers to the physical storage resources managed by the file system. It is not necessarily on the local node, but connected to the node through the network. It is to gather some scattered (distributed on various computers in the LAN) shared folders into one folder (virtual shared folder). When ...

1. redis master-slave replication 1.1 problems Specific requirements are as follows: Configure the host 192.168.4.51 as the master serverConfigure the host 192.168.4.52 as the slave server of 192.168.4.51Test configuration 1.2 scheme Deploy the redis master-slave replication structure and the host role, as shown in figure-1: Figure ...

1. Prepare the virtual machine environment 1.1 problems This case requires the preparation of virtual machine environment. The specific requirements are as follows: Configuring the YUM source server on the springboardPrepare virtual machine master experiment environmentMinimum configuration: 2cpu, 2G memoryUninstall firewall firewalld- ...

abstract First of all, the following types of readers should take their seats by themselves: Readers who know a lot about CMDB but are not familiar with Python are strongly recommended to read the previous articles;Readers who know little about Python and can only write simple scripts are strongly recommended to read this article;Readers ...

Linux - firewall, SELinux rules 1, Firewall firewall rules Function of firewall: release or block some services and ports 1. Firewall Simple operation # 1. View firewall status systemctl status firewalld # 2. Turn off firewall systemctl stop firewalld # 3. Turn on the firewall systemctl start firewalld 2,firewall Direct rule of # 1. Vi ...

1. Data analysis 1.1 problems This case requires statistical analysis exercises: Use the client to create the input directory on hdfsAnd upload * txt file to input directoryCall the cluster to analyze the uploaded files and count the words with the most occurrences 1.2 steps To implement this case, you need to follow the following st ...