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System Configuration and Management — Configure a system to accept logging from a remote system

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In prior releases of redhat, remote logging was configured via syslogd. In RHEL6, this is replaced with rsyslog. The first step is to setup a remote server to receive the logging messages, http://www.rsyslog.com/receiving-messages-from-a-remote-system/ has a great walkthrough on setting this up. Edit /etc/rsyslog.conf an clear the # before the lines allowing syslog reception $ModLoad imudp.so […]

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System Configuration and Management — Configure a system to log to a remote system

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In prior releases of redhat, remote logging was configured via syslogd. In RHEL6, this is replaced with rsyslog. The first step is to setup a remote server to receive the logging messages, http://www.rsyslog.com/receiving-messages-from-a-remote-system/ has a great walkthrough on setting this up. Edit /etc/rsyslog.conf an clear the # before the lines allowing syslog reception $ModLoad imudp.so […]

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System Configuration and Management — Use iptables to implement packet filtering and configure network address translation (NAT)

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Assuming you know basic networking, routing, and firewalling, basic packet filtering in RHEL is fairly easy. While you can get quite complex with solutions, all we are worrying about here is basic filtering. Packet filtering in RHEL6 is controlled using a program called iptables. You can find the syntax for managing the tables by running […]

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System Configuration and Management — Route IP traffic and create static routes

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Using a Linux system as a router is nothing new – in fact many routers run some flavor of Linux. To perform this task you need a system with at least 2 interfaces (physical, virtual, or vlans) to route traffic through. The base of the actions I will be performing are from http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch03_:_Linux_Networking SCENARIO:RHEL6 server […]

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Preparing for my RHCE exam

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I am scheduled to take my RHCE exam later this month. Prior to the release of RHEL6, I felt fairly confident in my ability to pass, but now that they have released the new OS things have changed. Below is a list of the RHCE exam objectives (according to http://www.redhat.com/certification/rhce/objectives/). My hope is to methodically […]