Openstack computing host installation and configuration process II

Openstack computing host installation and configuration process 1. Environment configuration Hosts configuration   modify the / etc/hosts file and add wtcontroller, wtcompute1 and wtcompute2: 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost ...

Posted on Mon, 06 Apr 2020 08:53:20 -0700 by Toboe

Summary of k8s add node operation exceptions

Environment: k8s cluster with kubeadm mode not Question: 1. Check the versions of kubeadm, kubelet and kubectl installed in the source system [root@k8s-3 ~]# yum list kubeadm kubelet kubectl  //Loaded plug-in: fastestmirror Loading mirror speeds from cached hostfile  * base: mirrors.nju.edu.cn  * epel: ftp.riken.jp  * extras: mirrors.nju.edu.c ...

Posted on Mon, 06 Apr 2020 01:00:14 -0700 by ldmccla

How to test Linux command run time?

Liang Xu has written a Shell script in his work. This script can obtain time from four NTP servers in turn, and then set the most reliable time to system time. Because we have a high demand for time, we need to get the right time in a short time. So we need to test the running time of this script to see how long it will take from the start to t ...

Posted on Sun, 05 Apr 2020 21:35:52 -0700 by maGGot_H

Optimize Nginx service performance based on parameters

Reference material [1] . learn Linux operation and maintenance from the old boy: Web Cluster practice, old boy setup script Number of worker processes optimizing Nginx service The configuration parameters of the Nginx service corresponding to the optimized Nginx process are as follows Worker? Processes 1;? Sp ...

Posted on Sun, 05 Apr 2020 12:20:15 -0700 by nelson201

Installing multiple versions of jdk on Linux system

When a friend mentioned this, he tried to make a record for later. Installation environment: CentOS release 6.5 (Final) 64 bit 1. Install a jdk first, taking jdk 9 as an example [root@local opt]# ls jdk-9.0.4_linux-x64_bin.tar.gz [root@local opt]# tar zxvf jdk-9.0.4_linux-x64_bin.tar.gz ... [root@local opt]# ls jdk- ...

Posted on Sat, 04 Apr 2020 07:31:09 -0700 by jj33

kubernetes Cluster Installation Guide: kube-proxy Component Deployment

The kube-proxy component is to provide endpoint services for pod applications within a cluster. When we define an svc for a pod, the kube-proxy automatically generates a mapping relationship between the pod and the svc and proxies it to the cluster or hosts. 1 Installation preparation Specific note: All operations here are performed on ...

Posted on Sat, 04 Apr 2020 02:00:08 -0700 by jakeruston

Chapter 7 1. Input / output and template

Catalog I / O stream Flow operator** File read write [^ 1] I / O stream I / O class derivation Standard flow object Standard input stream: cin -- connected to standard input device, istream object Standard output stream: cout -- connected to standard output device, ostream objectcerr -- connected to standard error output device (no buf ...

Posted on Sat, 04 Apr 2020 01:54:31 -0700 by fallen00sniper

Shell Long ping script monitoring network status

The linux environment uses ping command + timestamp to record in the file In the production environment, whether the network is stable (network delay) is a very important index. In order to check the network delay conveniently, we can realize long-term network monitoring by ping command. 1, Use of ping command 1. Common parameters -i: The int ...

Posted on Fri, 03 Apr 2020 10:19:19 -0700 by Coruba67

golang Quick Start [9.1] - Deep into string storage, compilation, and operation

Previous Introduction to Goang Quick Start [1]-go Language golang Quick Start [2.1]-go Language Development Environment Configuration-windows golang Quick Start [2.2]-go Language Development Environment Configuration-macOS golang Quick Start [2.3]-go Language Development Environment Configuration-linux golang Quick Start [3]-go helloworld How ...

Posted on Fri, 03 Apr 2020 01:11:26 -0700 by scarface222

Dynamic Banner of new features of Spring boot 2.0

Spring Boot 2.0 provides many new features, among which there is a small colored egg: dynamic Banner. Today we'll try this one first. Configuration dependency To use Spring Boot 2.0, you first need to replace the project dependency package with the newly released 2.0 RELEASE. Now the website https://start.spring.io/ als ...

Posted on Fri, 03 Apr 2020 00:48:18 -0700 by jbbadaz