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Inside Sqale’s Backend
     RubyConf Taiwan 2012
       Gosuke Miyashita
   paperboy&co., Inc.,Japan
cpan:mizzy
github.com/mizzy
     mizzy.org
  @gosukenator
Kentaro Kuribayashi
Living on the Edge Rails
Kensuke Nagae
Introducing nonopaste-cli
Shinya Tsunematsu
     Building production server
environment of ruby in modern way
Hiroshi SHIBATA
How to discover the Ruby's defects
      with web application
Gosuke Miyashita
Inside Sqale’s Backend
We are from
paperboy&co., Japan
What is Sqale?
Cloud Application
Platform like Heroku
Architecture Overview
SFTP
       Git over SSH         HTTP/HTTPS
AWS    SSH


                             Web Proxy
      SSH Router
                            to Containers
     File             Deploy
                                 Containers
  Repositories        Servers
Containers
SFTP
       Git over SSH         HTTP/HTTPS
AWS    SSH


                             Web Proxy
      SSH Router
                            to Containers
     File             Deploy
                                 Containers
  Repositories        Servers
Virtual Environments
  Assigned To Users
Similar to Dynos of
      Heroku
Containers made by
LXC (Linux Containers)
EC2 Instance (1 Virtual Machine)
Container   Container   Container   Container   Container
   for         for         for         for         for
 user A      user A      user B      user B      user B



Container   Container   Container   Container   Container
   for         for         for         for         for
 user C      user D      user D      user E      user E



Container   Container   Container   Container   Container
   for         for         for         for         for
 user E       user F      user F      user F      user F
Nginx
     Unicorn
      sshd
   supervisrod
on each container
Amazon Linux
          +
Patched kernel(3.2.16)
grsecurity kernel patch
for various restrictions
original kernel patches
  to restrict tcp port
 bind and fork bomb
Anti fork bomb patch
makes some changes to
cgroup and fork process
See
paperboy-sqale/sqale-patches
         on GitHub
Web Proxy
SFTP
       Git over SSH         HTTP/HTTPS
AWS    SSH


                             Web Proxy
      SSH Router
                            to Containers
     File             Deploy
                                 Containers
  Repositories        Servers
HTTP/HTTPS

                               ELB



                nginx                           nginx




Container   Container   Container   Container    Container   Container
   for         for         for         for          for         for
 user A      user B      user B      user C       user C      user C
nginx
  lua-nginx-module
redis2-nginx-module
http://www.i4pc.jp/

                        Which containers?
           Redis                                      nginx
                 host001:8083, host001:8084
                                                         or

host001
 nginx port 8081     nginx port 8082   nginx port 8083        nginx port 8084

    Container           Container         Container              Container
       for                 for               for                    for
   lokka-mizzy         lokka-mizzy       i4pc-mizzy             i4pc-mizzy
nginx.conf (excerpt)
location / {
    set $container "";
    set $next_containers "";

    error_page 502 = @failover;

    rewrite_by_lua_file dynamic-proxy.lua;
    proxy_pass http://$container;
}
dynamic-proxy.lua (excerpt)
local reply = ngx.location.capture("/redis")
if reply.status ~= ngx.HTTP_OK then
  ngx.exit(503)
end

local containers, type =
  parser.parse_reply(reply.body)
dynamic-proxy.lua (excerpt)
while #containers > 0 do
  tmp = table.remove(
    containers,
    math.random(#containers))
  if ngx.shared.downed_containers:get(tmp) then
    ngx.log(ngx.DEBUG, tmp .. " is down")
  else
    container = tmp
    break
  end
end
dynamic-proxy.lua (excerpt)
ngx.var.container = container
ngx.var.next_containers
  = luabins.save(containers)
nginx.conf (again)
location / {
    set $container "";
    set $next_containers "";

    error_page 502 = @failover;

    rewrite_by_lua_file dynamic-proxy.lua;
    proxy_pass http://$container;
}
nginx.conf (excerpt)
location @failover {
    error_page 502 = @failover;

    rewrite_by_lua_file failover.lua;
    proxy_pass http://$container;
}
failover.lua (excerpt)
local downed_container = ngx.var.container
if downed_container then
  ngx.shared.downed_containers:set(
    downed_container,
    1,
    sqale.NEGATIVE_CACHE_SECONDS
  )
end
failover.lua (excerpt)
while #containers > 0 do
  tmp = table.remove(
    containers,
    math.random(#containers))
  if ngx.shared.downed_containers:get(tmp) then
    ngx.log(ngx.DEBUG, tmp .. " is down")
  else
    container = tmp
    break
  end
end
failover.lua (excerpt)
if not container then
  ngx.exit(503)
end

ngx.var.container = container
ngx.var.next_containers
  = luabins.save(containers)
nginx.conf (agin)
location @failover {
    error_page 502 = @failover;

    rewrite_by_lua_file failover.lua;
    proxy_pass http://$container;
}
SSH Router
SFTP
       Git over SSH         HTTP/HTTPS
AWS    SSH


                             Web Proxy
      SSH Router
                            to Containers
     File             Deploy
                                 Containers
  Repositories        Servers
Git           SFTP            SSH Login


               SSH Router




    File            File
Repositories   Repositories         Containers
(Git Server)   (File Server)
How implement this
     routing?
OpenSSH with script
authentication patch
See
mizzy/openssh-script-auth
       on GitHub
Change routes by
SSH_ORIGNAL_COMMAND
In case of
SSH_ORIGINAL_COMMAND
        is “git-*”
git push
        (ssh sqale@gateway.sqale.jp git-recieve-pack
        ‘/mizzy/lokka.git’)
                Run AuthorizedKeys
                Script
SSH Router                                 MySQL
                Verify the public key
                and get the user’s git
                server
                command=“ssh sqale@git001.sqale.lan
                git-recieve-pack
    File        ‘/var/repos/mizzy/lokka.git’”
Repository
(Git Server)
In case of
SSH_ORIGINAL_COMMAND
     is “sftp-server”
sftp sqale@gateway.sqale.jp
        (ssh sqale@gateway.sqale.jp sftp-server)

                Run AuthorizedKeys
                Script
SSH Router                                 MySQL
                 Verify the public key
                 and get the user’s file
                 server
                command=“ssh sqale@file001.sqale.lan
                sftp-server”
     File             git push               File
 Repository                              Repository
(File Server)                            (Git Server)
In case of
SSH_ORIGINAL_COMMAND
        is empty
ssh sqale@gateway.sqale.jp


             Run AuthorizedKeys
             Script
SSH Router                                 MySQL
             Verify the public key
             and get the user’s
             cotainers list
             Display the user’s containers list and
             wait the user’s selection

             command=“ssh sqale@
Container    users001.sqale.lan -p 8081”
Ruby On Rails
 Puppet/Chef
   Unicorn
    Resque
And many gems
多謝

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