By default the RedHat 7.2 installation will not allow a remote user to connect to the system using TELNET for security reasons. It is probably safest to leave the system like this and use an encrypted connect facility such as SSH. However if you do wish to allow TELNET access then you need to do the following.
Install the telnet-server RPM from the RedHat installation disk #1 either using a suitable package manager to use the following command line:
rpm --install --replacefiles --nodeps /mnt/cdrom/RedHat/RPMS/telnet-server-*.i386.rpm
This installation creates a file telnet in the directory /etc/xinetd.d . Edit this file and change the line
disable = yes
disable = no
Restart xinetd by the command
xinetd restart60class="post-60 post type-post status-publish format-standard hentry category-protor-tutorial tag-condition-monitoring tag-displacement tag-probes tag-protor tag-rotating-machinery tag-shaft-displacement tag-shaft-surface tag-vibration-measurement"
The measurement of shaft displacement is an important vibration measurement for rotating machines. Shaft displacement is usually monitored by non-contact shaft displacement probes that produce a voltage proportional to the distance of the shaft surface relative to the tip of the probe. Ideally two shaft displacement probes will be fitted to measure the displacement in both the horizontal and vertical directions. Actually the probes do not have to be exactly horizontal and vertical as Prosig’s PROTOR system is able to resolve into the horizontal and vertical directions.
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3class="post-3 post type-post status-publish format-standard hentry category-protor-tutorial tag-alarms tag-email tag-protor"
The AlarmMail facility is a background process which controls the automated dispatch of alert e-mails to specified users (User Name) mail accounts (Mail Address).
Continue reading AlarmMail Facility12class="post-12 post type-post status-publish format-standard hentry category-protor-redhat-linux-note tag-ati tag-ati-rage-128 tag-graphics-card tag-linux tag-protor tag-rage tag-redhat"
There appeared to be problems when using the ATI Rage 128 graphics card in a Redhet 7.3 system. The problem manifested itself as screen corruption when exitting the Window Manager. This happened if using FVWM or KDE Window Managers. The corruption appeared to get progressively worse with each log off.
Continue reading PROTOR Redhat Note: Setup of ATI Rage 128 Graphics Card50class="post-50 post type-post status-publish format-standard hentry category-protor-redhat-linux-note tag-linux tag-protor tag-ssh tag-vnc tag-vpn"
Describes the configuration and setup of a simple VPN for graphical remote access using the Open Source tools SSH and VNC
Read the full article here (PDF)47class="post-47 post type-post status-publish format-standard hentry category-protor-redhat-linux-note tag-diskonchip tag-linux tag-protor tag-redhat"
Describes the configuration and setup of a development environment for a Single Board Computer running Redhat Linux from a DiskOnChip device
Read the full article here (PDF)26class="post-26 post type-post status-publish format-standard hentry category-protor-redhat-linux-note tag-gnome tag-kde tag-linux tag-protor tag-redhat tag-xdm"
By default the RedHat 7.2 installation uses the GNOME Display Manager GDM or possibly the KDE Display Manager KDM. Both these Display Managers are very powerful and allow users to select the type of session to start ( such as GNOME or KDE ). There are also options and menus to shutdown or reboot the system. For a PROTOR installation where we want to control the users session then using the basic XFree86 display manager XDM is preferable.
Continue reading PROTOR Redhat : Installing XDM3411class="post-3411 post type-post status-publish format-standard hentry category-protor-redhat-linux-note tag-lilo tag-linux tag-protor tag-windows-nt"
In some configuration it may be required or desirable for Linux and Window NT to co-exist on the same system. Presuming Windows NT has been initially installed then the system will boot through the Windows NT Boot Loader. Assuming that a Linux system has been added to a spare partition or additional disk then the requirement is to add an option to the NT Boot Loader such that either Windows NT or Linux may be booted.
Continue reading PROTOR Note : Booting Linux using NT Loader73class="post-73 post type-post status-publish format-standard hentry category-protor-tutorial tag-keyphasor tag-phase tag-protor tag-rotating-machinery tag-tacho tag-tachometer tag-vibration"
This note describes the importance and setup of a keyphasor or tachometer signal for PROTOR Remote Monitoring Data Acquisition System (RMDAS) units. RMDAS units are provided with manual tachometer conditioning control. The note describes the control functions and there effect on the conditioned tachometer signal, it also describes the relationship between phase measurement and keyphasor triggering.
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35class="post-35 post type-post status-publish format-standard hentry category-protor-tutorial tag-historic tag-protor tag-shaft-gap"
It is possible to produce an shaft gap display within PROTOR for two perpendicularly mounted shaft proximity probes for system where the DC component of the proximity signal is measured…
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