Redis 三种模式
主从模式
Redis 虽然读取写入的速度都特别快,但是也会产生读压力特别大的情况。为了分担读压力,Redis 支持主从复制,Redis 的主从结构可以采用一主多从或者级联结构。
Redis 怎么实现主从复制
- 从服务器初始化时进行全量同步
- 初始化完成后执行增量同步
优点: 实现数据备份,做到读写分离
缺点: 当主节点发生故障掉线时,需要人工进行:故障转移
生如蝼蚁当立鸿鹄之志, 命如薄纸应有不屈之心!
参考文章:
DRBD的全称为:Distributed Replicated Block Device(DRBD)分布式块设备复制,DRBD是由内核模块和相关脚本构成,用以构建高可用的集群。其实现方式是通过网络来镜像整个设备。可以把它看作是一种网络RAID。它允许用户在远程机器上建立一个本地块设备的实时镜像。
(DRBD Primary)负责接收数据,把数据写到本地磁盘并发送给另一台主机(DRBD Secondary)。另一个主机再将数据存到自己的磁盘中。目前,DRBD 每次只允许对一个节点进行读写访问,但这对于通常的故障切换高可用集群来说已经足够用了,有可能以后的版本支持两个节点进行读写存取。
more >>安装常用软件
1 | sudo apt install -y vim bash-completion net-tools network-manager lrzsz unzip |
删除自带的工具
1 | # 彻底删除 snap 以及其配置文件 |
使用 helm 部署在 k8s 集群中的 skywalking 服务运行报错,报错信息如下:
1 | org.apache.skywalking.oap.server.core.storage.model.ModelInstaller -16539 [main] INFO [] - table: alarm_record does not exist. OAP is running in 'no-init' mode, waiting... retry 3s later. |
卸载自带的软件
1 | apt-get purge -y mysql-client mysql-server mysql-common mysql-server-core-5.5 mysql-client-5.5 mariadb-client mariadb-server mariadb-common |
配置好工作目录后,就可以编码开发了,在这之前,我们看一下 go 的通用项目结构,这里的结构主要是源代码相应地资源文件存放目录结构。
GOPATH
目录就是我们存储我们所编写源代码的目录。该目录下往往要有三个子目录:src、bin、pkg。
golang 的数值类型分为以下几种:整数、浮点数、复数,其中每一种都包含了不同大小的数值类型,例如有符号整数包含 int8、int16、int32、int64 等,每种数值类型都决定了对应的大小范围和是否支持正负符号。
more >>一个字符串是一个不可改变的字节序列,字符串可以包含任意的数据,但是通常是用来包含可读的文本,字符串是 UTF-8 字符的一个序列(当字符为 ASCII 码表上的字符时占用一个字节,其它字符根据需要占用 2-4 个字节)
more >>tag:
缺失模块。
1、请确保node版本大于6.2
2、在博客根目录(注意不是yilia-plus根目录)执行以下命令:
npm i hexo-generator-json-content --save
3、在根目录_config.yml里添加配置:
jsonContent: meta: false pages: false posts: title: true date: true path: true text: false raw: false content: false slug: false updated: false comments: false link: false permalink: false excerpt: false categories: false tags: true
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