I get the same issue behind Lighttpd, and so I don't believe this is
an Apache bug.
Facts:
- Mongrel stops working after a period of inactivity
- ActiveRecord timeout is not the issue (recommended fix changes
nothing)
- Happens behind lighttpd and apache
- Nothing in the logs to give any clues
Workaround:
I haven't found a solution yet, but if I setup monit to contact the
mongrels every few minutes, I'm able to prevent this issue, since
it's related to inactivity.
Hope this helps,
Pete
PS. Does anyone know if Zed has any future bug-fix releases or
updates planned? I believe the last release was January, right?
On Jul 29, 2007, at 4:47 PM, Evan Weaver wrote:
Looks like you hit the venerable Apache bug 39499 (and/or 37770),
maybe.
Try adding
SetEnv force-proxy-request-1.0 1
SetEnv proxy-nokeepalive 1
to your VirtualHost block for the Rails app.
Evan
On 7/29/07, Olly Lylo <[EMAIL PROTECTED]> wrote:
Hi
I posted this to the Ruby on Rails Talk group but I thought I'd
post it here
too as it's probably a more appropriate group. Hope this is ok.
I'm running a 2-instance Mongrel cluster behind Apache 2.2.4 with
Rails
1.2.3. If no requests are received by the application for several
hours
(this usually happens overnight) then Mongrel stops
responding and no requests are detected by Rails (at least nothing
is in the
Rails log). Nothing untoward is in the Mongrel log.
If you try and visit the application, the request times out with a
502 Proxy
Error. Apache is still up and running and serving static files
without a
problem, but the following is present in the Apache error log
(from trying
to hit the SessionController, identified by / sessions) which may
provide a
clue:
[Sun Jul 29 08:37:36 2007] [error] proxy: error reading status
line from
remote server 127.0.0.1
[Sun Jul 29 08:37:36 2007] [error] proxy: Error reading from
remote
server returned by /sessions
Restarting the Mongrel cluster resolves the problem until the next
time it
happens. I have done a lot of reading about this issue online and
a number
of sources -- including the Mongrel FAQ -- point to being able to
fix a
'hanging mongrel' situation by setting this value in environment.rb:
ActiveRecord::Base.verification_timeout = 14400
This make the ActiveRecord timeout value less than the MySQL
default of
28800. I have made this change and it doesn't appear to make a
difference.
Can anyone advise me on what to try next to diagnose this issue? I'm
quickly running out of ideas and I'd appreciate a bit of help!
Here are the vitals from our Ubuntu 6.0.6 server:
MySQL
Ver 14.12 Distrib 5.0.22, for pc-linux-gnu (x86_64) using
readline
5.1
connect_timeout 5
interactive_timeout 28800
max_connect_errors 10
max_connections 100
max_user_connections 0
wait_timeout 28800
ruby 1.8.6 (2007-03-13 patchlevel 0) [x86_64-linux]
cgi_multipart_eof_fix ( 2.2)
fastthread (1.0)
mongrel (1.0.1)
mongrel_cluster (1.0.2)
Apache/2.2.4 (Unix)
Mongrel Cluster Config:
port: "8000"
environment: production
address: 127.0.0.1
pid_file: log/mongrel.pid
servers: 2
user: [the user]
group: [the group]
Apache Load Balancer setup:
<Proxy balancer://appname_cluster>
BalancerMember http://127.0.0.1:8000
BalancerMember http://127.0.0.1:8001
</Proxy>
Apache Loaded Modules:
core_module (static)
authn_file_module (static)
authn_default_module (static)
authz_host_module (static)
authz_groupfile_module (static)
authz_user_module (static)
authz_default_module (static)
auth_basic_module (static)
cache_module (static)
include_module (static)
filter_module (static)
deflate_module (static)
log_config_module (static)
env_module (static)
headers_module (static)
setenvif_module (static)
proxy_module (static)
proxy_connect_module (static)
proxy_ftp_module (static)
proxy_http_module (static)
proxy_ajp_module (static)
proxy_balancer_module (static)
ssl_module (static)
mpm_prefork_module (static)
http_module (static)
mime_module (static)
status_module (static)
autoindex_module (static)
asis_module (static)
cgi_module (static)
negotiation_module (static)
dir_module (static)
actions_module (static)
userdir_module (static)
alias_module (static)
rewrite_module (static)
so_module (static)
php5_module (shared)
info_module (shared)
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--
Evan Weaver
Cloudburst, LLC
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