Programmer Group

1, Preparatory work CentOS 7.4 system server needs to be configured with yum source, firewall is closed, clock service of each node is synchronized, and each node can communicate with each other through host name. All machines turn off the firewall and selinux setenforing 0 (Modify profile (close) sed -i 's/SELINUX=enforcing/SELINUX=disab ...

Reference connection:< https://docs.ceph.com/docs/master/ 2.1 cluster planning At least three Centos7 system virtual machines are used to deploy Ceph cluster. Hardware configuration: 2C4G. In addition, each machine should be equipped with at least three hard disks (5g for each disk) HOST IP Service Mark cephmanager01 public network:1 ...

Introduction to ftp transmission tools iis7 service management tool is a powerful FTP software with excellent interactive interface and powerful functions. It supports FTP functions such as regular upload and download, regular backup, automatic update, batch upload and download, FTP multi site management, online editing, etc. At the same time, ...

preface: In view of the need for home-based work during the epidemic, remote work is necessary. At present, the simplest way is to realize it through the direct port mapping of the company's route, but there are inevitably security risks, For this reason, the editor temporarily decided to build openvpn to realize this function. Speaking of ope ...

Getting started with Docker Definition of container Stand alone processes running in user space Isolated from other user space programs A container runs in a separate user space At the bottom is a separate kernel space History of development FreeBSD jail， 2000 Linux VServer ,2001 CGroups NameSpace LXC Docker ，2010 libcontainer runC ...

Upgrade plan Scope of influence: During the upgrade, the existing system will not be affected, and the system will maintain normal operation. After the upgrade, the availability test will be conducted for a period of time, and the monitoring on production will be replaced after the system is stable. Upgrade method: This upgrade adopts the blue ...

Recently, more than 10 secondary domain names of individuals need to issue certificates. Let's Encrypt provides free SSL certificates with a term of three months. When they expire, they need renew. The official also provides certbot, a tool for automatic renew. Here, we record the general certificate that uses Let's Encrypt to generate t ...

1: Experimental environment1.1: Huawei ensp software1.2: PC, router and switchPC in initialization state and router and switch in initialization state2: Experimental process2.1: equipment configurationIn the ensp, the PC, router and switch are made into a topological diagram according to the diagram.2.2 configure SW1 switch [SW1]vlan batch 1 ...

Use Grafana and Prometheus to monitor the performance of Linux server, mainly through node_ The exporter monitors, such as CPU, memory, disk, etc. Prometheus collects data from remote machines through HTTP protocol and stores Prometheus local timing database. Install startup node_exporterNode needs to be installed on the monitored server_ exp ...

In MySQL, there are many powerful tools, such as mysql, mysqladmin, mysqldump, etc.1. mysql commandThe Mysql command is the most common command tool used to provide a command line interface for users to operate and manage MySQL servers.You can see how it's used in more detail through mysql --help.1) Grammar used for -e, -u, -p, -h, -P, and so ...