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If you find any errors in the Red Hat Enterprise Linux documentation, or just have a suggestion, please read the Submitting Documentation Errata page.
| x86 Red Hat Enterprise Linux AS Installation Guide |
The following passage is incorrect:
"To turn on IP forwarding manually, issue the
following command as root:
cat /proc/sys/net/ipv4/ip_forward"
It should instead read:
"To check the status of IP
forwarding at any time, issue the following command
as root:
cat /proc/sys/net/ipv4/ip_forward"
Saving Network Packet Filter Settings
The commands listed in the for saving iptables and ipchains rules are incorrect.
To save iptables rules, you should issue the following command:
/sbin/service iptables save |
If you are using ipchains, issue the following command:
/sbin/service ipchains save |
These commands will properly save firewall settings in the /etc/sysconfig/ directory.
This section describes the challenges of clustering FTP servers and offers a manual solution to the problem using iptables or ipchains. Unfortunately when using this solution, additional configuration to the FTP server software is required for passive connections.
By default, FTP servers reply to passive requests with the IP address on which the request was received. When clustering FTP servers, however, the FTP server must instead return the public virtual IP address. The wu-ftpd FTP server, included with Red Hat Linux Advanced Server 2.1, can be configured to do this by adding the following line to its configuration file, /etc/ftpaccess:
| passive address <virtual_ip> <network_mask> |
Where <virtual_ip> is the virtual IP address for the clustered FTP service and <network_mask> is the network notation for the network interface of the real server receiving the passive request, for example: 10.0.0.0/8. For more information on customizing wu-ftpd, see the man page for ftpaccess.
If the real servers are running Red Hat Linux 8.0, it is also possible to configure vsftpd to respond correctly to passive requests. To do this, add the following line to its configuration file, /etc/vsftpd.conf:
| pasv_address <virtual_ip> |
Where <virtual_ip> is the virtual IP address for the clustered FTP service.
If the clustered FTP servers are not Red Hat based or the FTP server software does not offer the appropriate configuration option, issue the following command on both the active and passive LVS routers:
| /sbin/modprobe ip_vs_ftp |
This will automatically handle FTP clustering without any customized iptables or ipchains rules.
To make this setting persistent through reboot, add the following line to /etc/modules.conf:
| add above ip_vs ip_vs_ftp |
Please note that the ip_vs_ftp module only works for Piranha clusters using the NAT topography. Also, this method has not been stress tested, so consider load testing this approach before implementation.
| Cluster Manager Installation and Administration Guide |
The export command used to configure the Sun JRE with release 4 of Netscape Navigator/Communicator is incorrect.
The command you should issue is as follows:
| export NPX_PLUGIN_PATH=/usr/java/jre1.3.1_02/plugin/i386/ns4:/usr/lib/netscape/plugins |
| x86 Red Hat Enterprise Linux WS Installation Guide |
None Available
| x86 Red Hat Enterprise Linux ES Installation Guide |
None Available