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  Sonyboy 14:31 on October 20, 2009 Permalink | Reply
  Tags: apache2 ( 2 ), linux   

  Apache2 hangs with ‘Digest: generating secret for digest authentication’ 

  I was running Apache2+SSL on a VM (Virtual Machine).

  After enabling SSL and trying to add another SSL site, apache would refuse to restart and the following error would show up in /var/log/apache2.log

  Digest: generating secret for digest authentication

  After doing some research, it turns out that the VM did not have enough entropy to generate much of anything. Increasing this is easy, but may not be completely secure.

  $ cat /proc/sys/kernel/random/entropy_avail
  139

  I found that rng-tools could help me solve this.

  apt-get install rng-tools

  Start the service

  rngd -r /dev/urandom -o /dev/random

  After running rngd, the entropy will increase at a gradual rate.

  cat /proc/sys/kernel/random/entropy_avail
  2220

  If you want this to survive a reboot, you’ll need to put it in a startup script.

   

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  Sonyboy 09:32 on July 22, 2009 Permalink | Reply
  Tags: apache2 ( 2 ), linux, semaphore   

  Apache2 – No space left on device 

  I had problems restarting Apache2… After researching a lot I found that it was due there were myriads of semaphore-arrays left, owned by my www-data user.

  The following appears to be some of the errors Apache writes in the log.

  • [emerg] (28)No space left on device: Couldn’t create accept lock

    or

  • [crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed

    or

  • [error] (28)No space left on device: Cannot create SSLMutex

  After stopping Apache I found the semaphores with the following command

  ipcs -s | grep www-data

  Removing this semaphores immediately solved the problem.

  ipcs -s | grep www-data | perl -e ‘while (<STDIN>) { @a=split(/\s+/); print `ipcrm sem $a[1]`}’

   
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  Sonyboy 16:00 on June 23, 2009 Permalink | Reply
  Tags: apt, dpkg, linux, purge   

  HOWTO: Purge files from an already removed package 

  Simply use the following command:

  dpkg –purge PACKAGENAME