Many times is necessary identify who eth (eth0, eth1, eth2, … , ethN) correspond to physical interface.
For this you can use the ethtool
ethtool -p ethN
example:
ethtool -p eth0
One or more LEDs on the specific physical ethernet port are blinking now.
Remember this is a very intrusive configuration.
Look your security policies with atention.
1. Make de keys using ssh-keygen
On the “Enter passphrase” question leave black and enter.
# ssh-keygen -t dsa -f ~/.ssh/id_dsa Generating public/private dsa key pair. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/user1/.ssh/id_dsa. Your public key has been saved in /home/user1/.ssh/id_dsa.pub. The key fingerprint is: 87:52:b6:ec:c9:1f:f2:ce:be:d7:33:e9:1b:2b:33:dd user1@myserver1
2. Copy the public key for the server you want to have direct access.
# scp .ssh/id_dsa.pub user1@myserver2:~/.ssh/authorized_keys_temp
On myserver2 increse autorized_keys
# cat ~/.ssh/authorized_keys_temp >> ~/.ssh/authorized_keys
Remove temporary authorized_keys
# rm ~/.ssh/authorized_keys_temp
TIP: On RHEL 5 You can use ssh-copy-id
# ssh-copy-id -i ~user1/.ssh/id_dsa.pub user1@myserver2
On this example I´m using two servers named of myserver1 and myserve2 and the user is user1.
1. Install rsh-server
# yum install rsh-server -y Loaded plugins: rhnplugin, security Repository 'RHEL5LocalRepository' is missing name in configuration, using id This system is not registered with RHN. RHN support will be disabled. Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package rsh-server.x86_64 0:0.17-40.el5 set to be updated --> Finished Dependency Resolution Dependencies Resolved ======================================================================================================= Package Arch Version Repository Size ======================================================================================================= Installing: rsh-server x86_64 0.17-40.el5 RHEL5LocalRepository 40 k Transaction Summary ======================================================================================================= Install 1 Package(s) Upgrade 0 Package(s) Total download size: 40 k Downloading Packages: Running rpm_check_debug Running Transaction Test Finished Transaction Test Transaction Test Succeeded Running Transaction Installing : rsh-server 1/1 Installed: rsh-server.x86_64 0:0.17-40.el5 Complete!
2. Enable services
# chkconfig rsh on # chkconfig rlogin on # chkconfig rexec on # chkconfig nscd on # chkconfig xinetd on
3. Reestart xinetd and nscd
# /etc/init.d/xinetd restart Stopping xinetd: [ OK ] Starting xinetd: [ OK ] # /etc/init.d/nscd restart Stopping nscd: [ OK ] Starting nscd: [ OK ]
4. Edit /etc/securetty and add rsh, rlogin and rexec
# vi /etc/securetty
Put on end of file:
rsh rlogin rexec
5. Create file ~user1/.rhosts (user1 is my user example)
# vi ~user1/.rhosts
Put on end of file:
myserver2 user1
Change the permission of file
# chmod 600 ~user1/.rhost
6. Testing
On myserver2 with user1 create a file testing.file
# touch testing.file
Uses the rcp:
# rcp testing.file myserver1:tested.file
Look if file are created using the rexec
# rsh myserver1 ls -l ~user1
How to identify/get QLogic WWN on Red Hat Enterprise Linux 5 (RHEL5).
First identify your installed or recognized
# lspci | grep -i fibre 04:00.0 Fibre Channel: QLogic Corp. ISP2432-based 4Gb Fibre Channel to PCI Express HBA (rev 03) 04:00.1 Fibre Channel: QLogic Corp. ISP2432-based 4Gb Fibre Channel to PCI Express HBA (rev 03) 05:00.0 Fibre Channel: QLogic Corp. ISP2432-based 4Gb Fibre Channel to PCI Express HBA (rev 03) 05:00.1 Fibre Channel: QLogic Corp. ISP2432-based 4Gb Fibre Channel to PCI Express HBA (rev 03)
On Red Hat Enterprise Linux 5 (5.x) is on /sys/class/fc_host/hostX/port_name
(X is your device 1,2,3,…N)
For get use:
cat /sys/class/fc_host/hostX/port_name
Sample with multiple HBA (Fibre) QLogic
# ls /sys/class/fc_host/ host3 host4 host5 host6 # cat /sys/class/fc_host/host[3-6]/port_name 0x2100001b32936e24 0x2101001b32b36e24 0x2100001b32932821 0x2101001b32b32821
On Red Hat Enterprise Linux 4 (AS/ES) is on /proc/scsi/qla2xxx/1 (1,2,3,..N)
Sample:
# egrep [node|port] /proc/scsi/qlx2xxx/0 scsi-qla0-adapter-node=200000e08b1c19f2; scsi-qla0-adapter-port=210000e08b1c19f2;
Installing IBM lin_tape on Linux (Red Hat Enterprise Linux)
Steps for install lin_tape and lin_taped
1. Download the lin_tape source and lin_taped from ftp://ftp.software.ibm.com/storage/devdrvr/Linux/lin_tape_source-lin_taped/
lin_tape-X.YY.Z-W.src.rpm.bin lin_taped-X.YY.Z-rhel[V].arch.rpm.bin
Samples for version 1.20.0-1
lin_tape-1.20.0-1.src.rpm.bin lin_taped-1.20.0-rhel4.x86_64.rpm.bin
2. Rebuild lin_tape rpm source
# rpmbuild --rebuild lin_tape-X.YY.Z-W.src.rpm.bin
