Category Archives: Uncategorized

Serious vulnerability affecting all Linux systems

Details on a serious bug in the Bash shell found on most Linux and Unix systems was made public today. Red Hat published a detailed article about the issue today. To patch your Red Hat systems (RHEL, CentOS, Fedora, etc.) … Continue reading

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RHEL 5.11 Released

Read the Release Notes here. The Technical Notes can be found here.

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Official Heartbleed Knowledge Base Article from Red Hat

https://access.redhat.com/site/solutions/781793

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OpenSSL Heartbleed bug fix for RedHat and CentOS systems

RedHat has released an updated OpenSSL package to fix the Heartbleed bug in RedHat/CentOS 6.x systems. This bug does not affect RedHat/CentOS 5.x systems. You can read about this release here. First, you should clean Yum to ensure that you … Continue reading

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Operation Windigo

Research data on the Operation Windigo Linux Malware and how to detect and clean infected systems – http://www.welivesecurity.com/wp-content/uploads/2014/03/operation_windigo.pdf

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How to run commands as another user

This will allow you to run a command for any user, including those that don’t have set shells. This is particularly useful for testing a command as the Apache user. The syntax is as follows: su -s $SHELL $USER -c … Continue reading

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Change timezone in CentOS/Red Hat Linux (RHEL)/Fedora

Edit /etc/sysconfig/clock. Change ZONE line to your preferred time zone. You can see a list of time zones listed under /usr/share/zoneinfo/. For example, to use the Los Angeles time zone listed under /usr/share/zoneinfo/America/Los_Angeles: ZONE=”America/Los_Angeles”. Run the following command: tzdata-update Run the data command … Continue reading

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Flushing Cache in Memcache

If you’re using a web application with Memcache, you may find that when resorting data (whether application files or database), you may run into strange erorrs when bringing your application back online. For example, errors regarding missing application classes or … Continue reading

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Postfix as a local relay

This can be used for situations where you have an internet facing machine (web server) and back-end machines (application server, database server, etc.). In our examples, we’ll assume the following: Internet facing web server IP is 192.168.1.2 Back-end database IP … Continue reading

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Upgrade to CentOS 5.9

yum clean all yum -y upgrade glibc* yum* rpm* python* yum -y upgrade

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