Chronyd synchronization time (Server/Client) configuration

The chronyd time server, like the previous NTP function, provides time. I'm not good at basic concepts. Cronyd was born after NTP. Recently, I downloaded the latest Centos Linux 8.1, and found that there is no ntp service in it. Baidu yisou found that it was changed to Chronyd. This article is to deploy a server + client test. 1. Server side ...

Posted on Fri, 29 May 2020 03:53:18 -0400 by valtido

Elastic search uses snapshot data migration and disaster recovery

In the face of multi cluster enterprise level complex architecture, it is very important to prepare a set of backup cluster. The backup cluster usually does not participate in reading and writing operations, but always contains all the data of the business cluster. When there is a business cluster that cannot be used, you can directly switch e ...

Posted on Thu, 28 May 2020 07:15:27 -0400 by ayzee

corosync v1 + pacemaker high availability cluster deployment resource configuration (VIP+httpd+NFS)

Experimental purpose: to deploy httpd high availability service (+ NFS) using corosync v1 + pacemaker. This experiment uses Centos 6.8 system, file system resource server, NA1 node 1, NA2 node 2, VIP192.168.94.222 Directory structure: (annoying, the layout is in a mess) 1. corosync v1 + pacemaker basic installation 2. Installation of pacemak ...

Posted on Thu, 28 May 2020 03:28:39 -0400 by noirsith

k8s deployment Flink

https://flink.apache.org/ #Flink official website This step (k8s) deployment requires a profile First copy all the configuration files of Flink to the local, and then hang the local configuration files in the POD 1.1 configuration file of jobmanager vim flink-conf.yaml Modify profile jobmanager.rpc.address: flink-jobmanager-svc jobmanage ...

Posted on Wed, 27 May 2020 11:14:00 -0400 by jviney

On the difference between SCPClient class of ganymed-ssh2 version 262 and build210

ganymed-ssh2 is a tool library that uses SSH to connect to the server through java. The previous two versions of pom file configuration are as follows: <!--ssh connect linux--> <!-- https://mvnrepository.com/artifact/ch.ethz.ganymed/ganymed-ssh2 --> <dependency> <groupId>ch.ethz.ganymed</groupId> <arti ...

Posted on Wed, 27 May 2020 10:40:53 -0400 by kharbat

Deep understanding of system calls

Experiment content: Find a system call whose system call number is the same as the last two digits of the student number [i.e. system call 97] Trigger the system call through assembly instructions Trace the kernel process of the system call through gdb Focus on the analysis of the save site, recovery site and system call return of the system ...

Posted on Wed, 27 May 2020 09:44:19 -0400 by Birmingham

Deploy Docker private warehouse Registry

Blog directory 1, Deploy Registry private warehouse 1. Configure registry private warehouse 2. Upload image to registry private warehouse 2, Configure Docker client to access private warehouse 3, Configure registry load authentication As more and more images are used by docker, there needs to be a place to save images, which is the warehouse ...

Posted on Wed, 27 May 2020 04:21:45 -0400 by vocoder

HeartBeat (NFS file mount for Web service hot standby)

The two hosts are backup to each other, and the Web service displays the resources on the NFS file system. Add a Linux 6.8 system as an NFS file server catalog: 1. Complete the basic configuration of HeartBeat 2. Configure server for NFS 3. Configure HeartBeat resource management server to use NFS resources 4. Result test 1. Complete the b ...

Posted on Tue, 26 May 2020 11:20:35 -0400 by steadyguy

docker installation configuration

1, docker installation configuration Modify host name [root@docker ~]#vi /etc/hostname View Linux system information [root@docker ~]# cat /etc/redhat-release #View version number CentOS Linux release 7.7.1908 (Core) [root@docker ~]# uname -r #View linux kernel 3.10.0-1062.el7.x86_64 Replace with alicloud yum source [root@docker ~]# wge ...

Posted on Tue, 26 May 2020 11:04:57 -0400 by rhock_95

Deployment learning of Nginx + Docker multi-stage construction

A website was deployed a few days ago. It turns out that I have been uploading files through ftp after publishing. Several tycoons told me about multi-stage construction. At this time, I don't need to publish any more. I will directly add docker support to the project. #See https://aka.ms/containerfastmode to understand how Visual Studio uses ...

Posted on Mon, 25 May 2020 11:01:36 -0400 by kotun