Category: openEuler

1.Check Spaces. Input ‘df -h’ to check spaces of the cloud server.When the / partition is full(100% used).The service(like mysql,httpd,and so on) of cloud server wouldn’t be operated.The business/website of the cloud server can’t be visited normally.Filesystem can’t read-in any data. In addition,‘df -h’ commmand can check system mounting and use ratio of disks. 2.Check…

Premise:When the Ceph cluster have problems,how to fix it?How to remove the error host? There many troubleshooting steps. 1.Check the web page by https://IP:8443 2.Check the status of ceph cluster in ‘ceph01’ host in the ‘cephadm shell’ Check status of hosts in the cluster by ‘ceph orch host ls’.If status is ‘Offline’,the host is not…

The Deployment of Ceph Cluster After the deployment of ceph cluster,the subsequent management work will run throughout the entire ceph lifecycle.Creation and management of pools is essential.Before the management of ceph cluster,you should have a ceph cluster,you can refer the manual of deployment of ceph. 1.RADOS(Reliable Autonomic Distributed Object Store) RADOS is the basis of…

1.Threats of the Kernel and Operating System Operating System is the kernel of information system,it managing software and hardware.All applications depends on operating system to ensure the integrity,confidentiality,availability and controllability of information. What is the Linux kernel? Main threat of operating system and kernel are:hardware failure,infiltration,system vulnerabilities and so on.The safety of operating system depends…

Keepalived is a routing software and a tool of cluster deployment.It based on the VRRP (Virtual Router Redundancy Protocol). There 2 main functions of keepalived,one is health checking for LVS systems,the other is implementation of the VRRPv2 stack to handle load balancer failover. 1.Computer Cluster A computer cluster consists of two(or more than 2) hosts…

Ceph is an open source SDS(Software Defined Storage) distributed memory.It has a high usability,expansiblility.It can store a large mount of data. 1.The Preparation Prepare 4 Virtual Machines or 4 servers.The cluster consists of a main host,two node hosts,and a client host. Configure the hostname in ‘/etc/hosts’,and set the hostname by ‘hostnamectl set-hostname (your hostname)’ command.…

1.The Container Container is a vitualization technology which can make package of application and provides PaaS service. The most common engine of container is Docker,Containerd,Podman and so on. 2.How to install a docker? First,you need check your software repository and install docker,containerd.io,docker-compose,and so on.It depends on your operating system. Then,If your software repository don’t have…

The LAMP enviorment and the wordpress website consists of 4 parts:Linux operating system,Apache(httpd) webserver,Mysql database language,Php(or Python) language.If the Php version is outdated,you can update your Php version. 1.Check your Php verison.Input ‘php -v‘. 2.If the Php version is outdated,input ‘dnf update -y php‘ to update Php version. Before the updation,you can input ‘dnf list…

Httpd service is an open-source Http webserver based on the modern operating system like Linux,Windows,and so on.This is the fundamental of Httpd service.This post introduce how to deploy your httpd in your Linux operating system like EulerOS,openEuler,Redhat,and so on. 1.First,you should prepare your Linux operating system on your personal computer/cloud server/server and ensure the network…

Premise:The cloud server can logging by local method(like VNC),but remote logging is unavailable.The cloud server can’t log in by SSH,or by remote tools like Cloudshell,Xshell.How to solve the problem? First,log in the cloud server by correct usermane and password. This is the checklist to solve the problem: 1.Input ‘systemctl status sshd‘ in the cloud server…