CentOS

centos7 yum 安装 mysql

穿精又带淫゛_ 提交于 2021-02-08 15:55:45
centos7 yum 安装mysql 介绍在CentOS7上yum安装数据库服务器MySQL Community Server 5.7的方法。 准备 CentOS7默认安装了和MySQL有兼容性的MariaDB数据库,在我们安装MySQL5.7之前为了避免发生冲突首先删除MariaDB。 # rpm -qa | grep maria mariadb-libs-5.5.50-1.el7_2.x86_64 # yum remove mariadb-libs -y 添加MySQL的yum源 在CentOS7上yum安装MySQL需使用 MySQL的yum源 。执行以下命令首先添加MySQL的yum源。 # yum localinstall http://dev.mysql.com/get/mysql57-community-release-el7-7.noarch.rpm 添加MySQL的yum源之后可以使用 yum info命令 搜索mysql-community-server,确认详细的信息。 # yum info mysql-community-server Available Packages Name : mysql-community-server Arch : x86_64 Version : 5.7.14 Release : 1.el7 Size : 152 M

Linux_修复GRUB引导故障的3种方法!

半城伤御伤魂 提交于 2021-02-08 09:49:34
修复GRUB引导故障 一.修复GRUB引导故障 1. 故障原因 2. 故障现象 3. 解决思路 4.修复GRUB引导故障 二.修复GRUB引导故障方法1 ——方法一:手动输入引导命令(笨拙繁琐,不建议使用) 三.修复GRUB引导故障方法2 ——方法二:进入急救模式,恢复GRUB引导程序 ——主引导程序记录被破坏 1.创建磁盘,格式化,挂载,备份文件 2.模拟对MBR中的GRUB引导程序的破坏,不破坏分区表 3.引导界面进入急救模式,从备份文件中恢复GRUB引导程序 四.方法二具体实验步骤: 1.创建磁盘,格式化,挂载,备份文件 2.模拟对MBR中的GRUB引导程序的破坏,不破坏分区表 3.引导界面进入急救模式,从备份文件中恢复GRUB引导程序 五.引导界面进入急救模式,方法3 重建GRUB菜单配置文件 ————配置文件丢失、删除 重新构建GRUB菜单的配置文件 退出chroot环境,并重启 六.引导界面进入急救模式,方法3实验步骤 重建GRUB菜单配置文件实验 重新构建GRUB菜单的配置文件 退出chroot环境,并重启 一.修复GRUB引导故障 1. 故障原因 MBR中的GRUB弓|导程序遭到破坏 grub.conf文件丢失、引导配置有误 2. 故障现象 系统引导停滞,显示“grub>" 提示符 3. 解决思路 尝试手动输入引导命令 进入急救模式,重写或者从备份中恢复grub

Install tcmalloc on CentOS

∥☆過路亽.° 提交于 2021-02-08 06:14:37
问题 I installed tcmalloc on CentOS using the command: sudo yum install google-perftools And it proceeds correctly. But I cannot find any installed perftools libraries in /usr/lib/ , so I cannot set LD_PRELOAD variable. Then, when I tried to compile with flag -ltcmalloc , the compiler did not recognize it, which quite made sense. What else should I specify to use tcmalloc on CentOS? Thanks. 回答1: You can always build from source. I have done that with my centos 8. Source code can be found here:

Install tcmalloc on CentOS

徘徊边缘 提交于 2021-02-08 06:08:39
问题 I installed tcmalloc on CentOS using the command: sudo yum install google-perftools And it proceeds correctly. But I cannot find any installed perftools libraries in /usr/lib/ , so I cannot set LD_PRELOAD variable. Then, when I tried to compile with flag -ltcmalloc , the compiler did not recognize it, which quite made sense. What else should I specify to use tcmalloc on CentOS? Thanks. 回答1: You can always build from source. I have done that with my centos 8. Source code can be found here:

“End of script output before headers” on CentOS, but working on other LAMP stacks

点点圈 提交于 2021-02-08 02:40:08
问题 I've set up a Centos 6 + CPanel 11 VPS, and everything is as it was out of the box. I've installed Phorum 5.2.20 in the public_html directory, but Phorum is causing an error 500. The error log reports: [Mon Jul 27 11:21:57.770447 2015] [core:error] [pid 14342] [client x.x.x.x:42531] End of script output before headers: admin.php The code works fine on my Debian LAMP server (and several other non-Centos/CPanel LAMP stacks I've used to test this), and Wordpress and some other stuff runs fine on

“End of script output before headers” on CentOS, but working on other LAMP stacks

一曲冷凌霜 提交于 2021-02-08 02:39:48
问题 I've set up a Centos 6 + CPanel 11 VPS, and everything is as it was out of the box. I've installed Phorum 5.2.20 in the public_html directory, but Phorum is causing an error 500. The error log reports: [Mon Jul 27 11:21:57.770447 2015] [core:error] [pid 14342] [client x.x.x.x:42531] End of script output before headers: admin.php The code works fine on my Debian LAMP server (and several other non-Centos/CPanel LAMP stacks I've used to test this), and Wordpress and some other stuff runs fine on

“End of script output before headers” on CentOS, but working on other LAMP stacks

陌路散爱 提交于 2021-02-08 02:39:32
问题 I've set up a Centos 6 + CPanel 11 VPS, and everything is as it was out of the box. I've installed Phorum 5.2.20 in the public_html directory, but Phorum is causing an error 500. The error log reports: [Mon Jul 27 11:21:57.770447 2015] [core:error] [pid 14342] [client x.x.x.x:42531] End of script output before headers: admin.php The code works fine on my Debian LAMP server (and several other non-Centos/CPanel LAMP stacks I've used to test this), and Wordpress and some other stuff runs fine on

CentOS7下简单搭建Prometheus+Grafana监控系统

白昼怎懂夜的黑 提交于 2021-02-08 01:46:06
Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. 1、Features Prometheus's main features are: a multi-dimensional data model with time series data identified by metric name and key/value pairs PromQL, a flexible query language to leverage this dimensionality no reliance on distributed storage; single server nodes are autonomous time series collection happens via a pull model over HTTP pushing time series is supported via an intermediary gateway targets are discovered via service discovery or static configuration multiple modes of graphing and

在CentOS 7上安装Kafka

↘锁芯ラ 提交于 2021-02-07 22:53:56
简介 Kafka 是一种高吞吐的分布式发布订阅消息系统,能够替代传统的消息队列用于解耦合数据处理,缓存未处理消息等,同时具有更高的吞吐率,支持分区、多副本、冗余,因此被广泛用于大规模消息数据处理应用。Kafka 支持Java 及多种其它语言客户端,可与Hadoop、Storm、Spark等其它大数据工具结合使用。中文网站: http://kafka.apachecn.org/quickstart.html 本教程主要介绍Kafka 在Centos 7上的安装和使用,包括功能验证和集群的简单配置。 安装JDK Kafka 使用Zookeeper 来保存相关配置信息,Kafka及Zookeeper 依赖Java 运行环境,从 oracle网站 下载JDK 安装包,解压安装: $tar zxvf jdk-8u65-linux-x64.tar.gz $mv jdk1.8.0_65 java 设置Java 环境变量: JAVA_HOME=/opt/java PATH=$PATH:$JAVA_HOME/bin export JAVA_HOME PATH 也可以选择yum install安装,相应设置环境变量。 安装Kafka 从 官网 下载Kafka 安装包,解压安装: tar zxvf kafka_2.11-0.8.2.2.tgz mv kafka_2.11-0.8.2.2 kafka cd

通过SignalR技术整合即时通讯(IM)在.NET敏捷开发框架中落地

泪湿孤枕 提交于 2021-02-07 18:48:04
1、引言 **即时通讯(IM)**是RDIFramework.NET敏捷开发框架全新提供的一个基于Web的即时通讯、内部聊天沟通的工具。界面美观大方对于框架内部进行消息的沟通非常方便。基于RDIFramework.NET敏捷开发框架的即时通讯IM支持常规的用户对用户(点对点)聊天、工作流程流转的提醒、服务端消息的推送等。消息到达还有类似QQ的声音提醒,同时对消息进行了持久化处理,即时离线的用户,上线后也会收到消息,不会造成消息的丢失。还提供了很多扩展接口供用户实际扩展使用,非常的强大,方便。 通过“企业内部聊天IM”我们可以扩展很多应用出来。这儿特别说明的是我们的IM使用的是SignalR技术。.NET SignalR 是为.NET 开发人员提供的一个库,可以简化开发人员将实时 Web 功能添加到应用程序的过程。实时 Web 功能是指这样一种功能:当所连接的客户端变得可用时服务器代码可以立即向其推送内容,而不是让服务器等待客户端请求新的数据。什么是实时通信的Web呢?就是让客户端(Web页面)和服务器端可以互相通知消息及调用方法,当然这是实时操作的。SignalR提供了非常简单易用的高阶API,使服务器端可以单个或批量调用客户端上的JavaScript函数,并且非常方便地进行连接管理,例如客户端连接到服务器端,或断开连接,客户端分组,以及客户端授权,使用SignalR都非常