我使用capistrano将rails应用程序部署到大约20台服务器，当服务器数量为10时，它可以正常工作，当它增加到＆gt;〜10时，它不再工作
这是错误
cap aborted!
Errno::EPIPE: Broken pipe
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/server_version.rb:44:in `write'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/server_version.rb:44:in `negotiate!'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/server_version.rb:32:in `initialize'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/session.rb:84:in `new'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/session.rb:84:in `initialize'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh.rb:232:in `new'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh.rb:232:in `start'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/sshkit-1.11.2/lib/sshkit/backends/connection_pool.rb:59:in `call'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/sshkit-1.11.2/lib/sshkit/backends/connection_pool.rb:59:in `with'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/sshkit-1.11.2/lib/sshkit/backends/netssh.rb:155:in `with_ssh'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/sshkit-1.11.2/lib/sshkit/backends/netssh.rb:49:in `upload!'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/capistrano-3.6.1/lib/capistrano/tasks/git.rake:24:in `block (3 levels) in <top (required)>'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/sshkit-1.11.2/lib/sshkit/backends/abstract.rb:29:in `instance_exec'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/sshkit-1.11.2/lib/sshkit/backends/abstract.rb:29:in `run'
/Users/khiem-nguyen/workspace/ruby/nenga-onepiece/cl-chef/deploy/vendor/bundle/ruby/2.3.0/gems/sshkit-1.11.2/lib/sshkit/runners/parallel.rb:12:in `block (2 levels) in execute'
Tasks: TOP => git:check => git:wrapper
The deploy has failed with an error: Broken pipe
** Invoke deploy:failed (first_time)
** Execute deploy:failed
** DEPLOY FAILED
** Refer to log/capistrano.log for details. Here are the last 20 lines:
DEBUG Uploading /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh 0.0%
DEBUG Uploading /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh 0.0%
INFO [7c256e12] Running /usr/bin/env chmod 700 /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh on onepiece-web07
DEBUG [7c256e12] Command: ( export RBENV_ROOT="$HOME/.rbenv/bin/rbenv" PATH="$HOME/.rbenv/shims:$HOME/.rbenv/bin:$PATH" ; /usr/bin/env chmod 700 /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh )
INFO Uploading /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh 100.0%
INFO Uploading /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh 100.0%
INFO [846397ba] Finished in 0.065 seconds with exit status 0 (successful).
INFO [3e8f8a49] Running /usr/bin/env chmod 700 /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh on onepiece-web03
DEBUG [3e8f8a49] Command: ( export RBENV_ROOT="$HOME/.rbenv/bin/rbenv" PATH="$HOME/.rbenv/shims:$HOME/.rbenv/bin:$PATH" ; /usr/bin/env chmod 700 /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh )
INFO [7c256e12] Finished in 0.037 seconds with exit status 0 (successful).
INFO [264aa0db] Running /usr/bin/env chmod 700 /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh on onepiece-web01
DEBUG [264aa0db] Command: ( export RBENV_ROOT="$HOME/.rbenv/bin/rbenv" PATH="$HOME/.rbenv/shims:$HOME/.rbenv/bin:$PATH" ; /usr/bin/env chmod 700 /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh )
INFO [a8720934] Finished in 0.265 seconds with exit status 0 (successful).
INFO [3e8f8a49] Finished in 0.043 seconds with exit status 0 (successful).
INFO [264aa0db] Finished in 0.038 seconds with exit status 0 (successful).
DEBUG Uploading /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh 0.0%
INFO Uploading /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh 100.0%
INFO [3d959fa8] Running /usr/bin/env chmod 700 /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh on onepiece-web02
DEBUG [3d959fa8] Command: ( export RBENV_ROOT="$HOME/.rbenv/bin/rbenv" PATH="$HOME/.rbenv/shims:$HOME/.rbenv/bin:$PATH" ; /usr/bin/env chmod 700 /tmp/git-ssh-nenga-onepiece-production-khiem-nguyen.sh )
INFO [3d959fa8] Finished in 0.045 seconds with exit status 0 (successful).
我认为有一些与ssh max connection ???
相关的东西上限版本：3.6.1 SSH工具包：1.9.0
答案 0 :(得分：0)
SSHKit（Capistrano中的SSH层）使用连接池。这意味着它为每个主机维护SSH连接。如果在增加主机时看到管道出现故障，我唯一能想到的是防火墙或网关（即ssh代理）可能限制了同时连接的数量。
作为解决方法，您可以尝试禁用连接池。将以下内容添加到您的deploy.rb：
# Disable connection pool
SSHKit::Backend::Netssh.pool.idle_timeout = 0
这会使您的部署速度变慢，但它可能会解决连接错误。
答案 1 :(得分：0)
您可以尝试在Git服务器的服务器上的/ etc / ssh / sshd_config中调整MaxStartup。
默认值为10:30:60，前10个限制为此。
MaxStartups 指定最大并发未经身份验证的配置数 sshd守护进程的一部分。其他连接将是 删除直到身份验证成功或LoginGraceTime 到期连接。默认值为10.
Alternatively, random early drop can be enabled by specifying the
three colon separated values "start:rate:full" (e.g.,
"10:30:60"). sshd will refuse connection attempts with a proba-
bility of "rate/100" (30%) if there are currently "start" (10)
unauthenticated connections. The probability increases linearly
and all connection attempts are refused if the number of unau-
thenticated connections reaches "full" (60).