master

目录 Redis Cluster redis cluster 特点 搭建redis cluster 访问redis cluster redis-cli 访问redis cluster 重新分片数据 新加master节点 新加一个复制slave节点 方式一 方式二 删除一个节点 灾备节点 升级或者需要重启节点 对于slave 对于master 迁移到redis cluster Redis Cluster 构建redis cluster。然后测试，操作redis cluster。redis集群中的data会自动被分片在跨多个reids nodeds. 参考官当 点击这里 redis cluster 特点 自动分片dataset数据集到rediscluster的节点2中。自动哦！ redis cluster提供持续使用操作数据功能，当出现集群中一些节点失败或者不能communicte和其它正常节点时。 搭建redis cluster 下载 wget http://download.redis.io/releases/redis-5.0.5.tar.gz tar xf redis-5.0.5.tar.gz 编译 cd redis-5.0.5 make 安装 make install PREFIX=/server/redis #

MySQL 本身通过 show slave status 提供了 Seconds_Behind_Master ，用于衡量主备之间的复制延迟，但是 今天碰到了一个场景，发现 Seconds_Behind_Master 为 0 ， 备库的 show slave status 显示IO/SQL 线程都是正常的 ， MySQL 的主库上的变更却长时间无法同步到备库上。如果没有人为干预，直到一个小时以后， MySQL 才会自动重连主库，继续复制主库的变更。 影响范围： MySQL ， Percona ， MariaDB 的所有版本。 虽然这种场景非常特殊，遇到的概率并不高，但是个人觉得有必要提醒一下使用 MySQL 的 DBA 们。通过对这个场景的分析，也有助于我们更加深入的理解 MySQL replication 重试机制。 一、重现步骤 搭建主备的复制，临时断开主库的网络，并 kill 掉主库 MySQL 的 binlog dump 线程。 此时观察备库的复制情况， show slave status 中： Slave_IO_Running: Yes Slave_SQL_Running: Yes Seconds_Behind_Master: 0 但是此时你把网络恢复以后，在主库做任何变更，备库都无法获得数据更新了。而且备库上的show slave status 显示： IO 线程 SQL

最近遇到部分系统因为redis服务挂掉，导致部分服务不可用。所以希望搭建一个redis集群镜像，把原先散落各处的redis服务器统一管理起来，并且保障高可用和故障自动迁移。 一 redis集群分类 大家都知道redis集群有两种，一种是redis sentinel，高可用集群，同时只有一个master，各实例数据保持一致；一种是redis cluster，分布式集群，同时有多个master，数据分片部署在各个master上。基于我们的需求和redis本身技术的成熟度，本次要搭建的是redis sentinel。 Redis 的 Sentinel 系统用于管理多个 Redis 服务器（instance）， 该系统执行以下三个任务： 监控（Monitoring）： Sentinel 会不断地检查你的主服务器和从服务器是否运作正常。 提醒（Notification ： 当被监控的某个 Redis 服务器出现问题时， Sentinel 可以通过 API 向管理员或者其他应用程序发送通知。 自动故障迁移（Automatic failover）： 当一个主服务器不能正常工作时， Sentinel 会开始一次自动故障迁移操作， 它会将失效主服务器的其中一个从服务器升级为新的主服务器， 并让失效主服务器的其他从服务器改为复制新的主服务器； 当客户端试图连接失效的主服务器时，

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I'm trying to retrieve a server control in JavaScript. For testing purposes I am calling the JavaScript function from the page load event. protected void Page_Load ( object sender , EventArgs e ){ ClientScript . RegisterClientScriptBlock ( GetType (), "js" , "confirmCallBack();" , true ); } And my JavaScript function is function confirmCallBack () { var a = document . getElementById ( '<%= Page.Master.FindControl("PlaceHolderContent").FindControl("Button1").ClientID %>' ); var b = document . getElementById ( '<%=Button1.ClientID%>'

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Good evening! I know this is very usual and there are probably thousands of answers on the internet but I couldn't find one that was helfull. I have two local branches: MASTER Mk I made a lot of changes to Mk, committed these, and switched to MASTER to merge these two branches. But there were conflicts. So now I am on the MASTER branch, can not switch to Mk anymore, but need to override my MASTER with Mk. It keeps saying error: Your local changes to the following files would be overwritten by merge Is there a way to do this? git mergetool -

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a dotfiles repository where all my vim plugins are stored as submodules so they are easy to update when they have changes. I thought these two commands did the same thing, but I noticed this must not be the case. I knew I had updates to pull down in several submodules so I ran git pull origin master --recurse-submodules from the root of the parent repository. It appeared to iterate over each submodule, but only fetch updates from their origin repositories. When I ran git submodule foreach git pull origin master then it actually ran

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Jenkins master is running on Amazon instance and slave machine set up on dedicated Soyoustart machine. Worked fine until it was needed to redo the slave setup: reinstalled the OS, installed Java, added masters key to slave authorized_keys and removed/added again the slave in masters known_hosts. Set up new credentials for the slave and configured the node in Jenkins master but it is unable to connect to the slave. The setup is the the same that is and has been working with other slaves without hiccups. The only thing different is that this

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: Does anyone have any advice on how to pull from Azure container registry whilst running within Azure container service (kubernetes) I've tried a sample deployment like the following but the image pull is failing: kind : Deployment apiVersion : extensions / v1beta1 metadata : name : jenkins - master spec : replicas : 1 template : metadata : name : jenkins - master labels : name : jenkins - master spec : containers : - name : jenkins - master image : myregistry . azurecr . io / infrastructure / jenkins - master : 1.0 . 0

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've had simple project being managed in a Git repository. To date I haven't intentionally created any branches, but when I tried to create my first today using $ git branch mybranch I see this error: warning: refname 'master' is ambiguous. fatal: Ambiguous object name: 'master'. Digging deeper: $ git branch -a * master remotes/master/HEAD -> master/master remotes/master/master Is this normal to see in Git? Have I cloned my repository incorrectly? What is the best way to resolve this problem? 回答1: It seems it's ambiguous because your remote

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: We use git for most of the web applications we build in our shop, and though the applications themselves use a variety of technologies (PHP, Rails, etc), we generally have a staging and production server for each site. Typically, these servers have different sets of database credentials as well as different environment-based configuration settings (e.g. caching). Our workflow generally involves maintaining two git branches per project: master, which reflects the production server, and staging, which reflects staging. New features are