~$ sudo apt-get

Author Archive

For a lack of LSOF

by on Aug.28, 2012, under Linux

When you have to deal with system that lacks lsof and cannot be easily installed, you can run the following to show information regarding currently open file handlers.

ls -l `ls -l /proc/*/fd/ 2>/dev/null | grep ">" | cut -d ">" -f 2 | grep "/" | sort | uniq`

If the culprit of disk space usage has already been deleted, you’ll find the following in your output.

ls: /var/log/openvswitch/ovs-vswitchd.log.1: No such file or directory
ls: (deleted): No such file or directory


Teran came up with the following.

for file in `ls -l /proc/*/fd/* | grep deleted | awk '{print $9}'`; do echo -n "$file "; ls -l $file | awk '{print $11}' | tr -d '\n'; stat -L $file | grep Size; done

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Error accessing XVP java console

by on Aug.04, 2012, under Linux

If you see
Network Error: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilder
when attempting to connect to an XVP console, update your SSL crt/key, restart (apache|nginx) and stunnel.

More information can be found here.
XVP troubleshooting guide

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Unable to connect to Xen Console

by on Mar.29, 2011, under Linux

If you encounter the following error when trying to connect to an instance with Xen, xenconsoled is not running.

xenconsole: Could not read tty from store: No such file or directory

To rectify, start /usr/sbin/xenconsoled.

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Display configuration options for an RPM

by on Mar.31, 2010, under Linux

rpm -q --queryformat="%{NAME}: %{OPTFLAGS}\n" packagename

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Fast large file finder

by on Jan.20, 2010, under Linux

The following will display all files over 100MB in size on the server except for those in /proc.

find / -path /proc -prune -o -type f -size +102400k -printf "%s %h/%f\n" | sort -rn -k1 | head -n 50 | awk '{ print $1/1048576 "MB" " " $2}'

For a specific case, multiple paths.

find / -path /images -prune -o -path /var/run/sr-mount -prune -o -path /proc -prune -o -type f -size +102400k -printf "%s %h/%f\n" | sort -rn -k1 | head -n 50 | awk '{ print $1/1048576 "MB" " " $2}'

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Install PHP Modules via PECL

by on Jan.13, 2010, under Apache, PHP

First, mount the /tmp partition with exec permissions.

mount -o remount,exec /tmp

To install a package via pecl, run the following.

pecl install ssh2
(If the package is in a state other than stable, append the state after the package name ‘pecl install ssh2-beta’)

Last few lines of the module install will list the location of the library, usually /usr/lib/php/modules. Create a ini file with the module name within /etc/php.d/ with the extension directive.

# cat /etc/php.d/gd.ini
; Enable gd extension module

At this point, run the mount command to reestablish noexec for the /tmp partition.

mount -o remount,noexec /tmp

Gracefully restart apache and you are done.

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Reset mySQL root password

by on Jan.12, 2010, under mySQL

First, insert the init-file directive into the mySQL configuration under the [mysqld] section.


Create /var/lib/mysql/mysql-init with the following line. Replace ‘Changeme’ with a password of your choosing.

SET PASSWORD FOR ‘root’@’localhost’=password(‘Changeme’);

Restart the mySQL service and login as root with the password used above. Remember to remove the init-file directive and the init file you created once complete.

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Urchin : Unable to retrieve local file listing / Permission denied

by on Dec.10, 2009, under Apache, Linux

A common issue with occurs when apache is updated. Red Hat Enterprise Linux will revert /var/log/httpd to 0755 with root:root as ownership resulting in the following error.

WARNING: (****-****-****) Unable to retrieve local file listing
DETAIL: /var/log/httpd/access_log : Permission denied

A temporary fix until the next apache update, which are few and far between, is to ‘chmod 0755 /var/log/httpd’. Then ensure the current access logs are readable to the urchin user, 0644 should work. A permanent work around is to specify a log directory that will not be touched by the httpd rpm and give urchin sufficient permissions to access it.

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Remove default domain from IP in Plesk

by on Dec.01, 2009, under Plesk

Of all the things Plesk does well, this which would seem like common sense to include within the interface, cannot be done. To rectify this issue, you must update the default_domain field within psa.IP_Addresses.

mysql -uadmin -p`cat etc/psa/.psa.shadow` -Dpsa -e "UPDATE IP_Addresses SET default_domain_id = 0 WHERE ip_address = 'IPGOESHERE';"

Remove the WHERE statement if you wish to do a blanket default domain removal.

mysql -uadmin -p`cat etc/psa/.psa.shadow` -Dpsa -e "UPDATE IP_Addresses SET default_domain_id = 0;"

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Display Physical Memory in Server

by on Nov.13, 2009, under Linux, Server

The following is useful in the event that the wrong version (32 vs 64bit) of linux or non-SMP/PAE kernel is installed and you’d like to verify how much RAM physically is in the server.

dmidecode | awk '/\tSize: [0-9]+ MB/ {SUM=SUM+$2} END {print SUM}'

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