我遇到了与此相关的问题：Web app shuts down (502 error) while running a intensive task。 这是代码
您可以直接使用以下方式拖动此应用程序：
ssh -t 577d56787628e1406200010c@mainserver-bizcentral.rhcloud.com'尾巴
/日志 / *”
/var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/ruby_compat.rb:25:in select': closed stream (IOError)
from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/ruby_compat.rb:25:in io_select'
来自/var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/packet_stream.rb:75:in available_for_read?'
from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/packet_stream.rb:87:in next_packet'
来自/var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/session.rb:193:in block in poll_message'
from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/session.rb:188:in loop'
来自/var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/session.rb:188:in poll_message'
from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:474:in dispatch_incoming_packets'
来自/var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:225:in preprocess'
from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:206:in进程'
来自/var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:170:in block in loop'
from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:170:in loop'
来自/var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:170:in loop'
from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/ssh_helpers.rb:198:in阻止ssh_ruby'
来自/var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh.rb:240:in start'
from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/ssh_helpers.rb:173:in ssh_ruby'
from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/commands/tail.rb:40:in tail'
from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/commands/tail.rb:21:in run'
来自/var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/commands.rb:294:in execute'
from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/commands.rb:285:in阻止（3级）to_commander'
来自/var/lib/gems/2.3.0/gems/commander-4.2.1/lib/commander/command.rb:180:in call'
from /var/lib/gems/2.3.0/gems/commander-4.2.1/lib/commander/command.rb:155:in运行'
来自/var/lib/gems/2.3.0/gems/commander-4.2.1/lib/commander/runner.rb:421:in run_active_command'
from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/command_runner.rb:72:in运行！'
来自/var/lib/gems/2.3.0/gems/commander-4.2.1/lib/commander/delegates.rb:8:in run!'
from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/cli.rb:37:in start'
from /var/lib/gems/2.3.0/gems/rhc-1.38.7/bin/rhc:20:in <top (required)>'
from /usr/local/bin/rhc:23:in load'
来自/ usr / local / bin / rhc：23：in''
edwin @ edwin-Lenovo-FLEX-3-1130：〜$
对此有什么正确的解决方法。如果我获得了一个small.highcpu升级版或者是青铜版的中等CPU，如果它确实与内存有关，那么这个问题是否还会出现？
答案 0 :(得分：0)
502是一个网关问题。您的某个服务器的响应未到达另一台服务器。这也发生在我身上。
我的项目是在Apache和Mysql（5.5）上。我发现mysql服务器是真正的问题，因为我的流程列表非常庞大，并且由于表锁定和其他问题，很少有进程被卡住了。
通过指定适当的存储引擎（如InnoDb和更新的mysql到mariadb）来优化我的数据库。
通过实现像memchache这样的缓存解决了这个问题，减少了数据库服务器上的负载并且响应很快。
尝试重新启动服务器。
如果您看到504错误，也可以检查两台服务器的超时。