resque故障转移redis的解决方案

由于集群Redis仍然在工作，Resque中是否存在自动故障转移到Redis从站的机制，如果主机出现故障？

Answer 1

我不这么认为。 但是，您可以使用Apache Zookeeper非常轻松地实现主选举机制 ：

require "rubygems" require "zookeeper" def log(msg) puts "[#{Process.pid}] #{msg}" end def debug(obj) log(obj.inspect) end def on_master_changed(&block) loop do wcb = Zookeeper::WatcherCallback.new resp = @zookeeper.get_children(:path => @base_path, :watcher => wcb, :watcher_context => @base_path) children = resp[:children].map{|name| "#{@base_path}/#{name}"} new_master = children.sort.first block.call(new_master) while !wcb.completed? sleep(0.1) end end end @zookeeper = Zookeeper.new("localhost:2181") if @zookeeper.state != Zookeeper::ZOO_CONNECTED_STATE log 'Unable to connect to Zookeeper!' exit(1) end @base_path = "/nodes" @zookeeper.create(:path => @base_path) resp = @zookeeper.create(:path => "#{@base_path}/node-", :ephemeral => true, :sequence => true, :data => Process.pid.to_s) my_node = resp[:path] is_master = false log "My node is: #{my_node}" on_master_changed do |new_master| if new_master == my_node if is_master log "I am still the master. Bow before me or die!" else log "I am the new master. Behold!" end is_master = true else pid = @zookeeper.get(:path => new_master)[:data] log "New master is process #{pid}" end end 

您可以将上面的脚本修改为：

1. 使用redis服务器的IP /端口而不是进程的PID
2. 使用redis-cli和SLAVEOF命令来处理“成为主人”，“主人改变”和“不再掌握”的情况。

Answer 2

我发布了一个redis_failover gem，它为Ruby和ZooKeeper提供Redis故障转移：

https://github.com/ryanlecompte/redis_failover