Daniel Cukier's questions

I have an application in rails and it runs unicorn in production. There are some requests that take too long to process. I have configured the server to increase the timeout, so these request work correctly. The problem is that when the request takes more than 30 seconds to respond, I get this message:

Service Unavailable

The service is temporarily unavailable. Please try again later.

In unicorn.rb I have timeout 120 configured and my nginx.conf is:

upstream unicorn_my_app {
    server unix:/tmp/my_app.socket fail_timeout=0;
}

server {
        listen 80;
        client_max_body_size 4G;
        server_name www.my_app.com;

        proxy_read_timeout 120;

        keepalive_timeout 5;

        root /home/ubuntu/my_app/current/public;

        location / {
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          proxy_redirect off;

          if (!-f $request_filename) {
            proxy_pass http://unicorn_my_app;
            break;
          }
        }

        error_page 404 500 502 503 504 /erro/erro.html;
        location = /erro/ {
          root /home/ubuntu/my_app/current/public;
        }
}

Is there any other configuration that I forgot?

I am trying to update my Ubuntu 13.10 servers in Rackspace to avoid Shellshock bug, but it is not working. Here is what I am doing:

$ sudo apt-get update && sudo apt-get install --only-upgrade bash

it says:

bash is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 35 not upgraded.

$ env VAR='() { :;}; echo Bash is vulnerable!' bash -c "echo Bash Test"
Bash is vulnerable!
Bash Test

What I am doing wrong?

I have open files limit configured in /etc/security/limits.conf

*         hard    nofile      500000
*         soft    nofile      500000
root      hard    nofile      500000
root      soft    nofile      500000

When I start a process from shell, it works fine.

But there is one process that starts when the server boots.

# update-rc.d myprocess defaults 99

# cat /proc/1435/limits 
Limit                     Soft Limit           Hard Limit           Units     
....
Max open files            4096                 4096                 files     
....

Why this is happening?

I have a server in Rackspace with some ffmpeg processes listening to audio streaming. Off course when listening to streamings the incoming network traffic is high, and this is ok. But I noticed that there is also a considerable outgoing network traffic (about 1KB/sec / process). Is there any way to reduce this?

  PID USER     PROGRAM      DEV        SENT      RECEIVED       
14921 ubuntu   ffmpeg       eth0       1.704      67.070 KB/sec
15039 ubuntu   ffmpeg       eth0       1.120      10.513 KB/sec
13985 ubuntu   ffmpeg       eth0       1.023      41.767 KB/sec
15012 ubuntu   ffmpeg       eth0       1.008       5.430 KB/sec
13361 ubuntu   ffmpeg       eth0       0.967      28.596 KB/sec
14913 ubuntu   ffmpeg       eth0       0.953      21.550 KB/sec
15044 ubuntu   ffmpeg       eth0       0.848       0.909 KB/sec
13842 ubuntu   ffmpeg       eth0       0.810      12.917 KB/sec
14190 ubuntu   ffmpeg       eth0       0.773      16.160 KB/sec
14799 ubuntu   ffmpeg       eth0       0.722      12.406 KB/sec

I have a server in Rackspace API. I would like to use the nova command to remove the public network interface.

I am using the command:

nova virtual-interface-list <instance_id>

and then

nova virtual-interface-delete <instance_id> <virtual_interface_id>

But I get this error:

ERROR: Policy doesn't allow compute_extension:virtual_interfaces:delete to be performed. (HTTP 403) (Request-ID: req-304eff95-1328-40de-acee-7cdde601b62d)

How to automatically remove an instance from its LoadBalance (ELB) when you stop the instance?

I've tried to create a shutdown script and put it on chkconfig, but it is not working:

#!/bin/bash
# loggly authorization 
#
# chkconfig: 2345 20 10
# description: add host logs to loggly
# Source function library.
. /etc/init.d/functions
. /etc/profile.d/aws-apitools-common.sh

LB=MyLB
OK="\033[60G\e[0;32mOK\e[0m"
EC2_INSTANCE_ID="`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id || die \"wget instance-id has failed: $?\"`"
export JAVA_HOME=/usr/java/default

start() {
    echo "started service"
}

stop() {
        echo "removing $EC2_INSTANCE_ID from Load Balancer"
        elb-deregister-instances-from-lb $LB --instances=$EC2_INSTANCE_ID -I $AWS_ACCESS_KEY_ID -S $AWS_SECRET_ACCESS_KEY --quiet
        sleep 20
}


restart() {
        stop
        sleep 5
        start
}

case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart)
        restart
        ;;
  *)
        echo $"Usage: $0 {start|stop|restart}"
        exit 1
esac

exit $?

I have millions of files in a Amazon S3 bucket and I'd like to move these files to other buckets and folders with minimum cost or no cost if possible. All buckets are in the same zone.

How could I do it?

What is the easiest way to install tomcat6 under apache2 in a Debian system?

The idea is to have all incoming connections on port 80 of a specific host to be redirected to a specific Application under tomcat webapps directory.

So for example: http://app1.myhost.com:80 goes to http://myhost.com:8080/app1/ http://app2.myhost.com:80 goes to http://myhost.com:8080/app2/

and so on

[update]

What if the machine I'm trying to configure does not have a valid IP? Actually, to access the machines port 80, I need to connect to port 54080 on another host, which redirects to the machine's port 80